Commit | Line | Data |
---|---|---|
97e873e5 SR |
1 | /* |
2 | * Procedures for creating, accessing and interpreting the device tree. | |
3 | * | |
4 | * Paul Mackerras August 1996. | |
5 | * Copyright (C) 1996-2005 Paul Mackerras. | |
6 | * | |
7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
8 | * {engebret|bergner}@us.ibm.com | |
9 | * | |
10 | * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net | |
11 | * | |
e91edcf5 GL |
12 | * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and |
13 | * Grant Likely. | |
97e873e5 SR |
14 | * |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | */ | |
3482f2c5 | 20 | #include <linux/console.h> |
611cad72 | 21 | #include <linux/ctype.h> |
183912d3 | 22 | #include <linux/cpu.h> |
97e873e5 SR |
23 | #include <linux/module.h> |
24 | #include <linux/of.h> | |
fd9fdb78 | 25 | #include <linux/of_graph.h> |
581b605a | 26 | #include <linux/spinlock.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
75b57ecf | 28 | #include <linux/string.h> |
a9f2f63a | 29 | #include <linux/proc_fs.h> |
581b605a | 30 | |
ced4eec9 | 31 | #include "of_private.h" |
611cad72 | 32 | |
ced4eec9 | 33 | LIST_HEAD(aliases_lookup); |
611cad72 | 34 | |
5063e25a GL |
35 | struct device_node *of_root; |
36 | EXPORT_SYMBOL(of_root); | |
fc0bdae4 | 37 | struct device_node *of_chosen; |
611cad72 | 38 | struct device_node *of_aliases; |
a752ee56 | 39 | struct device_node *of_stdout; |
7914a7c5 | 40 | static const char *of_stdout_options; |
611cad72 | 41 | |
8a2b22a2 | 42 | struct kset *of_kset; |
75b57ecf GL |
43 | |
44 | /* | |
8a2b22a2 GL |
45 | * Used to protect the of_aliases, to hold off addition of nodes to sysfs. |
46 | * This mutex must be held whenever modifications are being made to the | |
47 | * device tree. The of_{attach,detach}_node() and | |
48 | * of_{add,remove,update}_property() helpers make sure this happens. | |
75b57ecf | 49 | */ |
c05aba2b | 50 | DEFINE_MUTEX(of_mutex); |
1ef4d424 | 51 | |
5063e25a | 52 | /* use when traversing tree through the child, sibling, |
581b605a SR |
53 | * or parent members of struct device_node. |
54 | */ | |
d6d3c4e6 | 55 | DEFINE_RAW_SPINLOCK(devtree_lock); |
97e873e5 SR |
56 | |
57 | int of_n_addr_cells(struct device_node *np) | |
58 | { | |
a9fadeef | 59 | const __be32 *ip; |
97e873e5 SR |
60 | |
61 | do { | |
62 | if (np->parent) | |
63 | np = np->parent; | |
64 | ip = of_get_property(np, "#address-cells", NULL); | |
65 | if (ip) | |
33714881 | 66 | return be32_to_cpup(ip); |
97e873e5 SR |
67 | } while (np->parent); |
68 | /* No #address-cells property for the root node */ | |
69 | return OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
70 | } | |
71 | EXPORT_SYMBOL(of_n_addr_cells); | |
72 | ||
73 | int of_n_size_cells(struct device_node *np) | |
74 | { | |
a9fadeef | 75 | const __be32 *ip; |
97e873e5 SR |
76 | |
77 | do { | |
78 | if (np->parent) | |
79 | np = np->parent; | |
80 | ip = of_get_property(np, "#size-cells", NULL); | |
81 | if (ip) | |
33714881 | 82 | return be32_to_cpup(ip); |
97e873e5 SR |
83 | } while (np->parent); |
84 | /* No #size-cells property for the root node */ | |
85 | return OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
86 | } | |
87 | EXPORT_SYMBOL(of_n_size_cells); | |
88 | ||
0c3f061c RH |
89 | #ifdef CONFIG_NUMA |
90 | int __weak of_node_to_nid(struct device_node *np) | |
91 | { | |
92 | return numa_node_id(); | |
93 | } | |
94 | #endif | |
95 | ||
6afc0dc3 | 96 | #ifndef CONFIG_OF_DYNAMIC |
75b57ecf GL |
97 | static void of_node_release(struct kobject *kobj) |
98 | { | |
99 | /* Without CONFIG_OF_DYNAMIC, no nodes gets freed */ | |
100 | } | |
0f22dd39 | 101 | #endif /* CONFIG_OF_DYNAMIC */ |
923f7e30 | 102 | |
75b57ecf GL |
103 | struct kobj_type of_node_ktype = { |
104 | .release = of_node_release, | |
105 | }; | |
106 | ||
107 | static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj, | |
108 | struct bin_attribute *bin_attr, char *buf, | |
109 | loff_t offset, size_t count) | |
110 | { | |
111 | struct property *pp = container_of(bin_attr, struct property, attr); | |
112 | return memory_read_from_buffer(buf, count, &offset, pp->value, pp->length); | |
113 | } | |
114 | ||
115 | static const char *safe_name(struct kobject *kobj, const char *orig_name) | |
116 | { | |
117 | const char *name = orig_name; | |
118 | struct kernfs_node *kn; | |
119 | int i = 0; | |
120 | ||
121 | /* don't be a hero. After 16 tries give up */ | |
122 | while (i < 16 && (kn = sysfs_get_dirent(kobj->sd, name))) { | |
123 | sysfs_put(kn); | |
124 | if (name != orig_name) | |
125 | kfree(name); | |
126 | name = kasprintf(GFP_KERNEL, "%s#%i", orig_name, ++i); | |
127 | } | |
128 | ||
129 | if (name != orig_name) | |
130 | pr_warn("device-tree: Duplicate name in %s, renamed to \"%s\"\n", | |
131 | kobject_name(kobj), name); | |
132 | return name; | |
133 | } | |
134 | ||
8a2b22a2 | 135 | int __of_add_property_sysfs(struct device_node *np, struct property *pp) |
75b57ecf GL |
136 | { |
137 | int rc; | |
138 | ||
139 | /* Important: Don't leak passwords */ | |
140 | bool secure = strncmp(pp->name, "security-", 9) == 0; | |
141 | ||
ef69d740 GM |
142 | if (!IS_ENABLED(CONFIG_SYSFS)) |
143 | return 0; | |
144 | ||
8a2b22a2 GL |
145 | if (!of_kset || !of_node_is_attached(np)) |
146 | return 0; | |
147 | ||
75b57ecf GL |
148 | sysfs_bin_attr_init(&pp->attr); |
149 | pp->attr.attr.name = safe_name(&np->kobj, pp->name); | |
150 | pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO; | |
151 | pp->attr.size = secure ? 0 : pp->length; | |
152 | pp->attr.read = of_node_property_read; | |
153 | ||
154 | rc = sysfs_create_bin_file(&np->kobj, &pp->attr); | |
155 | WARN(rc, "error adding attribute %s to node %s\n", pp->name, np->full_name); | |
156 | return rc; | |
157 | } | |
158 | ||
8a2b22a2 | 159 | int __of_attach_node_sysfs(struct device_node *np) |
75b57ecf GL |
160 | { |
161 | const char *name; | |
162 | struct property *pp; | |
163 | int rc; | |
164 | ||
ef69d740 GM |
165 | if (!IS_ENABLED(CONFIG_SYSFS)) |
166 | return 0; | |
167 | ||
8a2b22a2 GL |
168 | if (!of_kset) |
169 | return 0; | |
170 | ||
75b57ecf GL |
171 | np->kobj.kset = of_kset; |
172 | if (!np->parent) { | |
173 | /* Nodes without parents are new top level trees */ | |
28d3ee40 KC |
174 | rc = kobject_add(&np->kobj, NULL, "%s", |
175 | safe_name(&of_kset->kobj, "base")); | |
75b57ecf GL |
176 | } else { |
177 | name = safe_name(&np->parent->kobj, kbasename(np->full_name)); | |
178 | if (!name || !name[0]) | |
179 | return -EINVAL; | |
180 | ||
181 | rc = kobject_add(&np->kobj, &np->parent->kobj, "%s", name); | |
182 | } | |
183 | if (rc) | |
184 | return rc; | |
185 | ||
186 | for_each_property_of_node(np, pp) | |
187 | __of_add_property_sysfs(np, pp); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
75b57ecf GL |
192 | static int __init of_init(void) |
193 | { | |
194 | struct device_node *np; | |
195 | ||
196 | /* Create the kset, and register existing nodes */ | |
c05aba2b | 197 | mutex_lock(&of_mutex); |
75b57ecf GL |
198 | of_kset = kset_create_and_add("devicetree", NULL, firmware_kobj); |
199 | if (!of_kset) { | |
c05aba2b | 200 | mutex_unlock(&of_mutex); |
75b57ecf GL |
201 | return -ENOMEM; |
202 | } | |
203 | for_each_of_allnodes(np) | |
8a2b22a2 | 204 | __of_attach_node_sysfs(np); |
c05aba2b | 205 | mutex_unlock(&of_mutex); |
75b57ecf | 206 | |
8357041a | 207 | /* Symlink in /proc as required by userspace ABI */ |
5063e25a | 208 | if (of_root) |
75b57ecf | 209 | proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base"); |
75b57ecf GL |
210 | |
211 | return 0; | |
212 | } | |
213 | core_initcall(of_init); | |
214 | ||
28d0e36b TG |
215 | static struct property *__of_find_property(const struct device_node *np, |
216 | const char *name, int *lenp) | |
581b605a SR |
217 | { |
218 | struct property *pp; | |
219 | ||
64e4566f TT |
220 | if (!np) |
221 | return NULL; | |
222 | ||
a3a7cab1 | 223 | for (pp = np->properties; pp; pp = pp->next) { |
581b605a | 224 | if (of_prop_cmp(pp->name, name) == 0) { |
a3a7cab1 | 225 | if (lenp) |
581b605a SR |
226 | *lenp = pp->length; |
227 | break; | |
228 | } | |
229 | } | |
28d0e36b TG |
230 | |
231 | return pp; | |
232 | } | |
233 | ||
234 | struct property *of_find_property(const struct device_node *np, | |
235 | const char *name, | |
236 | int *lenp) | |
237 | { | |
238 | struct property *pp; | |
d6d3c4e6 | 239 | unsigned long flags; |
28d0e36b | 240 | |
d6d3c4e6 | 241 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 242 | pp = __of_find_property(np, name, lenp); |
d6d3c4e6 | 243 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
581b605a SR |
244 | |
245 | return pp; | |
246 | } | |
247 | EXPORT_SYMBOL(of_find_property); | |
248 | ||
5063e25a GL |
249 | struct device_node *__of_find_all_nodes(struct device_node *prev) |
250 | { | |
251 | struct device_node *np; | |
252 | if (!prev) { | |
253 | np = of_root; | |
254 | } else if (prev->child) { | |
255 | np = prev->child; | |
256 | } else { | |
257 | /* Walk back up looking for a sibling, or the end of the structure */ | |
258 | np = prev; | |
259 | while (np->parent && !np->sibling) | |
260 | np = np->parent; | |
261 | np = np->sibling; /* Might be null at the end of the tree */ | |
262 | } | |
263 | return np; | |
264 | } | |
265 | ||
e91edcf5 GL |
266 | /** |
267 | * of_find_all_nodes - Get next node in global list | |
268 | * @prev: Previous node or NULL to start iteration | |
269 | * of_node_put() will be called on it | |
270 | * | |
271 | * Returns a node pointer with refcount incremented, use | |
272 | * of_node_put() on it when done. | |
273 | */ | |
274 | struct device_node *of_find_all_nodes(struct device_node *prev) | |
275 | { | |
276 | struct device_node *np; | |
d25d8694 | 277 | unsigned long flags; |
e91edcf5 | 278 | |
d25d8694 | 279 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a GL |
280 | np = __of_find_all_nodes(prev); |
281 | of_node_get(np); | |
e91edcf5 | 282 | of_node_put(prev); |
d25d8694 | 283 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e91edcf5 GL |
284 | return np; |
285 | } | |
286 | EXPORT_SYMBOL(of_find_all_nodes); | |
287 | ||
28d0e36b TG |
288 | /* |
289 | * Find a property with a given name for a given node | |
290 | * and return the value. | |
291 | */ | |
a25095d4 GL |
292 | const void *__of_get_property(const struct device_node *np, |
293 | const char *name, int *lenp) | |
28d0e36b TG |
294 | { |
295 | struct property *pp = __of_find_property(np, name, lenp); | |
296 | ||
297 | return pp ? pp->value : NULL; | |
298 | } | |
299 | ||
97e873e5 SR |
300 | /* |
301 | * Find a property with a given name for a given node | |
302 | * and return the value. | |
303 | */ | |
304 | const void *of_get_property(const struct device_node *np, const char *name, | |
28d0e36b | 305 | int *lenp) |
97e873e5 SR |
306 | { |
307 | struct property *pp = of_find_property(np, name, lenp); | |
308 | ||
309 | return pp ? pp->value : NULL; | |
310 | } | |
311 | EXPORT_SYMBOL(of_get_property); | |
0081cbc3 | 312 | |
183912d3 SK |
313 | /* |
314 | * arch_match_cpu_phys_id - Match the given logical CPU and physical id | |
315 | * | |
316 | * @cpu: logical cpu index of a core/thread | |
317 | * @phys_id: physical identifier of a core/thread | |
318 | * | |
319 | * CPU logical to physical index mapping is architecture specific. | |
320 | * However this __weak function provides a default match of physical | |
321 | * id to logical cpu index. phys_id provided here is usually values read | |
322 | * from the device tree which must match the hardware internal registers. | |
323 | * | |
324 | * Returns true if the physical identifier and the logical cpu index | |
325 | * correspond to the same core/thread, false otherwise. | |
326 | */ | |
327 | bool __weak arch_match_cpu_phys_id(int cpu, u64 phys_id) | |
328 | { | |
329 | return (u32)phys_id == cpu; | |
330 | } | |
331 | ||
332 | /** | |
333 | * Checks if the given "prop_name" property holds the physical id of the | |
334 | * core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not | |
335 | * NULL, local thread number within the core is returned in it. | |
336 | */ | |
337 | static bool __of_find_n_match_cpu_property(struct device_node *cpun, | |
338 | const char *prop_name, int cpu, unsigned int *thread) | |
339 | { | |
340 | const __be32 *cell; | |
341 | int ac, prop_len, tid; | |
342 | u64 hwid; | |
343 | ||
344 | ac = of_n_addr_cells(cpun); | |
345 | cell = of_get_property(cpun, prop_name, &prop_len); | |
f3cea45a | 346 | if (!cell || !ac) |
183912d3 | 347 | return false; |
f3cea45a | 348 | prop_len /= sizeof(*cell) * ac; |
183912d3 SK |
349 | for (tid = 0; tid < prop_len; tid++) { |
350 | hwid = of_read_number(cell, ac); | |
351 | if (arch_match_cpu_phys_id(cpu, hwid)) { | |
352 | if (thread) | |
353 | *thread = tid; | |
354 | return true; | |
355 | } | |
356 | cell += ac; | |
357 | } | |
358 | return false; | |
359 | } | |
360 | ||
d1cb9d1a DM |
361 | /* |
362 | * arch_find_n_match_cpu_physical_id - See if the given device node is | |
363 | * for the cpu corresponding to logical cpu 'cpu'. Return true if so, | |
364 | * else false. If 'thread' is non-NULL, the local thread number within the | |
365 | * core is returned in it. | |
366 | */ | |
367 | bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun, | |
368 | int cpu, unsigned int *thread) | |
369 | { | |
370 | /* Check for non-standard "ibm,ppc-interrupt-server#s" property | |
371 | * for thread ids on PowerPC. If it doesn't exist fallback to | |
372 | * standard "reg" property. | |
373 | */ | |
374 | if (IS_ENABLED(CONFIG_PPC) && | |
375 | __of_find_n_match_cpu_property(cpun, | |
376 | "ibm,ppc-interrupt-server#s", | |
377 | cpu, thread)) | |
378 | return true; | |
379 | ||
380 | if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread)) | |
381 | return true; | |
382 | ||
383 | return false; | |
384 | } | |
385 | ||
183912d3 SK |
386 | /** |
387 | * of_get_cpu_node - Get device node associated with the given logical CPU | |
388 | * | |
389 | * @cpu: CPU number(logical index) for which device node is required | |
390 | * @thread: if not NULL, local thread number within the physical core is | |
391 | * returned | |
392 | * | |
393 | * The main purpose of this function is to retrieve the device node for the | |
394 | * given logical CPU index. It should be used to initialize the of_node in | |
395 | * cpu device. Once of_node in cpu device is populated, all the further | |
396 | * references can use that instead. | |
397 | * | |
398 | * CPU logical to physical index mapping is architecture specific and is built | |
399 | * before booting secondary cores. This function uses arch_match_cpu_phys_id | |
400 | * which can be overridden by architecture specific implementation. | |
401 | * | |
402 | * Returns a node pointer for the logical cpu if found, else NULL. | |
403 | */ | |
404 | struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) | |
405 | { | |
d1cb9d1a | 406 | struct device_node *cpun; |
183912d3 | 407 | |
d1cb9d1a DM |
408 | for_each_node_by_type(cpun, "cpu") { |
409 | if (arch_find_n_match_cpu_physical_id(cpun, cpu, thread)) | |
183912d3 SK |
410 | return cpun; |
411 | } | |
412 | return NULL; | |
413 | } | |
414 | EXPORT_SYMBOL(of_get_cpu_node); | |
415 | ||
215a14cf KH |
416 | /** |
417 | * __of_device_is_compatible() - Check if the node matches given constraints | |
418 | * @device: pointer to node | |
419 | * @compat: required compatible string, NULL or "" for any match | |
420 | * @type: required device_type value, NULL or "" for any match | |
421 | * @name: required node name, NULL or "" for any match | |
422 | * | |
423 | * Checks if the given @compat, @type and @name strings match the | |
424 | * properties of the given @device. A constraints can be skipped by | |
425 | * passing NULL or an empty string as the constraint. | |
426 | * | |
427 | * Returns 0 for no match, and a positive integer on match. The return | |
428 | * value is a relative score with larger values indicating better | |
429 | * matches. The score is weighted for the most specific compatible value | |
430 | * to get the highest score. Matching type is next, followed by matching | |
431 | * name. Practically speaking, this results in the following priority | |
432 | * order for matches: | |
433 | * | |
434 | * 1. specific compatible && type && name | |
435 | * 2. specific compatible && type | |
436 | * 3. specific compatible && name | |
437 | * 4. specific compatible | |
438 | * 5. general compatible && type && name | |
439 | * 6. general compatible && type | |
440 | * 7. general compatible && name | |
441 | * 8. general compatible | |
442 | * 9. type && name | |
443 | * 10. type | |
444 | * 11. name | |
0081cbc3 | 445 | */ |
28d0e36b | 446 | static int __of_device_is_compatible(const struct device_node *device, |
215a14cf KH |
447 | const char *compat, const char *type, const char *name) |
448 | { | |
449 | struct property *prop; | |
450 | const char *cp; | |
451 | int index = 0, score = 0; | |
452 | ||
453 | /* Compatible match has highest priority */ | |
454 | if (compat && compat[0]) { | |
455 | prop = __of_find_property(device, "compatible", NULL); | |
456 | for (cp = of_prop_next_string(prop, NULL); cp; | |
457 | cp = of_prop_next_string(prop, cp), index++) { | |
458 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) { | |
459 | score = INT_MAX/2 - (index << 2); | |
460 | break; | |
461 | } | |
462 | } | |
463 | if (!score) | |
464 | return 0; | |
465 | } | |
0081cbc3 | 466 | |
215a14cf KH |
467 | /* Matching type is better than matching name */ |
468 | if (type && type[0]) { | |
469 | if (!device->type || of_node_cmp(type, device->type)) | |
470 | return 0; | |
471 | score += 2; | |
0081cbc3 SR |
472 | } |
473 | ||
215a14cf KH |
474 | /* Matching name is a bit better than not */ |
475 | if (name && name[0]) { | |
476 | if (!device->name || of_node_cmp(name, device->name)) | |
477 | return 0; | |
478 | score++; | |
479 | } | |
480 | ||
481 | return score; | |
0081cbc3 | 482 | } |
28d0e36b TG |
483 | |
484 | /** Checks if the given "compat" string matches one of the strings in | |
485 | * the device's "compatible" property | |
486 | */ | |
487 | int of_device_is_compatible(const struct device_node *device, | |
488 | const char *compat) | |
489 | { | |
d6d3c4e6 | 490 | unsigned long flags; |
28d0e36b TG |
491 | int res; |
492 | ||
d6d3c4e6 | 493 | raw_spin_lock_irqsave(&devtree_lock, flags); |
215a14cf | 494 | res = __of_device_is_compatible(device, compat, NULL, NULL); |
d6d3c4e6 | 495 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
496 | return res; |
497 | } | |
0081cbc3 | 498 | EXPORT_SYMBOL(of_device_is_compatible); |
e679c5f4 | 499 | |
1f43cfb9 | 500 | /** |
71a157e8 | 501 | * of_machine_is_compatible - Test root of device tree for a given compatible value |
1f43cfb9 GL |
502 | * @compat: compatible string to look for in root node's compatible property. |
503 | * | |
25c7a1de | 504 | * Returns a positive integer if the root node has the given value in its |
1f43cfb9 GL |
505 | * compatible property. |
506 | */ | |
71a157e8 | 507 | int of_machine_is_compatible(const char *compat) |
1f43cfb9 GL |
508 | { |
509 | struct device_node *root; | |
510 | int rc = 0; | |
511 | ||
512 | root = of_find_node_by_path("/"); | |
513 | if (root) { | |
514 | rc = of_device_is_compatible(root, compat); | |
515 | of_node_put(root); | |
516 | } | |
517 | return rc; | |
518 | } | |
71a157e8 | 519 | EXPORT_SYMBOL(of_machine_is_compatible); |
1f43cfb9 | 520 | |
834d97d4 | 521 | /** |
c31a0c05 | 522 | * __of_device_is_available - check if a device is available for use |
834d97d4 | 523 | * |
c31a0c05 | 524 | * @device: Node to check for availability, with locks already held |
834d97d4 | 525 | * |
53a4ab96 KC |
526 | * Returns true if the status property is absent or set to "okay" or "ok", |
527 | * false otherwise | |
834d97d4 | 528 | */ |
53a4ab96 | 529 | static bool __of_device_is_available(const struct device_node *device) |
834d97d4 JB |
530 | { |
531 | const char *status; | |
532 | int statlen; | |
533 | ||
42ccd781 | 534 | if (!device) |
53a4ab96 | 535 | return false; |
42ccd781 | 536 | |
c31a0c05 | 537 | status = __of_get_property(device, "status", &statlen); |
834d97d4 | 538 | if (status == NULL) |
53a4ab96 | 539 | return true; |
834d97d4 JB |
540 | |
541 | if (statlen > 0) { | |
542 | if (!strcmp(status, "okay") || !strcmp(status, "ok")) | |
53a4ab96 | 543 | return true; |
834d97d4 JB |
544 | } |
545 | ||
53a4ab96 | 546 | return false; |
834d97d4 | 547 | } |
c31a0c05 SW |
548 | |
549 | /** | |
550 | * of_device_is_available - check if a device is available for use | |
551 | * | |
552 | * @device: Node to check for availability | |
553 | * | |
53a4ab96 KC |
554 | * Returns true if the status property is absent or set to "okay" or "ok", |
555 | * false otherwise | |
c31a0c05 | 556 | */ |
53a4ab96 | 557 | bool of_device_is_available(const struct device_node *device) |
c31a0c05 SW |
558 | { |
559 | unsigned long flags; | |
53a4ab96 | 560 | bool res; |
c31a0c05 SW |
561 | |
562 | raw_spin_lock_irqsave(&devtree_lock, flags); | |
563 | res = __of_device_is_available(device); | |
564 | raw_spin_unlock_irqrestore(&devtree_lock, flags); | |
565 | return res; | |
566 | ||
567 | } | |
834d97d4 JB |
568 | EXPORT_SYMBOL(of_device_is_available); |
569 | ||
e679c5f4 SR |
570 | /** |
571 | * of_get_parent - Get a node's parent if any | |
572 | * @node: Node to get parent | |
573 | * | |
574 | * Returns a node pointer with refcount incremented, use | |
575 | * of_node_put() on it when done. | |
576 | */ | |
577 | struct device_node *of_get_parent(const struct device_node *node) | |
578 | { | |
579 | struct device_node *np; | |
d6d3c4e6 | 580 | unsigned long flags; |
e679c5f4 SR |
581 | |
582 | if (!node) | |
583 | return NULL; | |
584 | ||
d6d3c4e6 | 585 | raw_spin_lock_irqsave(&devtree_lock, flags); |
e679c5f4 | 586 | np = of_node_get(node->parent); |
d6d3c4e6 | 587 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e679c5f4 SR |
588 | return np; |
589 | } | |
590 | EXPORT_SYMBOL(of_get_parent); | |
d1cd355a | 591 | |
f4eb0107 ME |
592 | /** |
593 | * of_get_next_parent - Iterate to a node's parent | |
594 | * @node: Node to get parent of | |
595 | * | |
c0e848d8 GU |
596 | * This is like of_get_parent() except that it drops the |
597 | * refcount on the passed node, making it suitable for iterating | |
598 | * through a node's parents. | |
f4eb0107 ME |
599 | * |
600 | * Returns a node pointer with refcount incremented, use | |
601 | * of_node_put() on it when done. | |
602 | */ | |
603 | struct device_node *of_get_next_parent(struct device_node *node) | |
604 | { | |
605 | struct device_node *parent; | |
d6d3c4e6 | 606 | unsigned long flags; |
f4eb0107 ME |
607 | |
608 | if (!node) | |
609 | return NULL; | |
610 | ||
d6d3c4e6 | 611 | raw_spin_lock_irqsave(&devtree_lock, flags); |
f4eb0107 ME |
612 | parent = of_node_get(node->parent); |
613 | of_node_put(node); | |
d6d3c4e6 | 614 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
f4eb0107 ME |
615 | return parent; |
616 | } | |
6695be68 | 617 | EXPORT_SYMBOL(of_get_next_parent); |
f4eb0107 | 618 | |
0d0e02d6 GL |
619 | static struct device_node *__of_get_next_child(const struct device_node *node, |
620 | struct device_node *prev) | |
621 | { | |
622 | struct device_node *next; | |
623 | ||
43cb4367 FF |
624 | if (!node) |
625 | return NULL; | |
626 | ||
0d0e02d6 GL |
627 | next = prev ? prev->sibling : node->child; |
628 | for (; next; next = next->sibling) | |
629 | if (of_node_get(next)) | |
630 | break; | |
631 | of_node_put(prev); | |
632 | return next; | |
633 | } | |
634 | #define __for_each_child_of_node(parent, child) \ | |
635 | for (child = __of_get_next_child(parent, NULL); child != NULL; \ | |
636 | child = __of_get_next_child(parent, child)) | |
637 | ||
d1cd355a SR |
638 | /** |
639 | * of_get_next_child - Iterate a node childs | |
640 | * @node: parent node | |
641 | * @prev: previous child of the parent node, or NULL to get first | |
642 | * | |
643 | * Returns a node pointer with refcount incremented, use | |
644 | * of_node_put() on it when done. | |
645 | */ | |
646 | struct device_node *of_get_next_child(const struct device_node *node, | |
647 | struct device_node *prev) | |
648 | { | |
649 | struct device_node *next; | |
d6d3c4e6 | 650 | unsigned long flags; |
d1cd355a | 651 | |
d6d3c4e6 | 652 | raw_spin_lock_irqsave(&devtree_lock, flags); |
0d0e02d6 | 653 | next = __of_get_next_child(node, prev); |
d6d3c4e6 | 654 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
d1cd355a SR |
655 | return next; |
656 | } | |
657 | EXPORT_SYMBOL(of_get_next_child); | |
1ef4d424 | 658 | |
3296193d TT |
659 | /** |
660 | * of_get_next_available_child - Find the next available child node | |
661 | * @node: parent node | |
662 | * @prev: previous child of the parent node, or NULL to get first | |
663 | * | |
664 | * This function is like of_get_next_child(), except that it | |
665 | * automatically skips any disabled nodes (i.e. status = "disabled"). | |
666 | */ | |
667 | struct device_node *of_get_next_available_child(const struct device_node *node, | |
668 | struct device_node *prev) | |
669 | { | |
670 | struct device_node *next; | |
d25d8694 | 671 | unsigned long flags; |
3296193d | 672 | |
43cb4367 FF |
673 | if (!node) |
674 | return NULL; | |
675 | ||
d25d8694 | 676 | raw_spin_lock_irqsave(&devtree_lock, flags); |
3296193d TT |
677 | next = prev ? prev->sibling : node->child; |
678 | for (; next; next = next->sibling) { | |
c31a0c05 | 679 | if (!__of_device_is_available(next)) |
3296193d TT |
680 | continue; |
681 | if (of_node_get(next)) | |
682 | break; | |
683 | } | |
684 | of_node_put(prev); | |
d25d8694 | 685 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
3296193d TT |
686 | return next; |
687 | } | |
688 | EXPORT_SYMBOL(of_get_next_available_child); | |
689 | ||
9c19761a SK |
690 | /** |
691 | * of_get_child_by_name - Find the child node by name for a given parent | |
692 | * @node: parent node | |
693 | * @name: child name to look for. | |
694 | * | |
695 | * This function looks for child node for given matching name | |
696 | * | |
697 | * Returns a node pointer if found, with refcount incremented, use | |
698 | * of_node_put() on it when done. | |
699 | * Returns NULL if node is not found. | |
700 | */ | |
701 | struct device_node *of_get_child_by_name(const struct device_node *node, | |
702 | const char *name) | |
703 | { | |
704 | struct device_node *child; | |
705 | ||
706 | for_each_child_of_node(node, child) | |
707 | if (child->name && (of_node_cmp(child->name, name) == 0)) | |
708 | break; | |
709 | return child; | |
710 | } | |
711 | EXPORT_SYMBOL(of_get_child_by_name); | |
712 | ||
c22e650e GL |
713 | static struct device_node *__of_find_node_by_path(struct device_node *parent, |
714 | const char *path) | |
715 | { | |
716 | struct device_node *child; | |
106937e8 LL |
717 | int len; |
718 | const char *end; | |
c22e650e | 719 | |
106937e8 LL |
720 | end = strchr(path, ':'); |
721 | if (!end) | |
722 | end = strchrnul(path, '/'); | |
723 | ||
724 | len = end - path; | |
c22e650e GL |
725 | if (!len) |
726 | return NULL; | |
727 | ||
728 | __for_each_child_of_node(parent, child) { | |
729 | const char *name = strrchr(child->full_name, '/'); | |
730 | if (WARN(!name, "malformed device_node %s\n", child->full_name)) | |
731 | continue; | |
732 | name++; | |
733 | if (strncmp(path, name, len) == 0 && (strlen(name) == len)) | |
734 | return child; | |
735 | } | |
736 | return NULL; | |
737 | } | |
738 | ||
1ef4d424 | 739 | /** |
75c28c09 | 740 | * of_find_node_opts_by_path - Find a node matching a full OF path |
c22e650e GL |
741 | * @path: Either the full path to match, or if the path does not |
742 | * start with '/', the name of a property of the /aliases | |
743 | * node (an alias). In the case of an alias, the node | |
744 | * matching the alias' value will be returned. | |
75c28c09 LL |
745 | * @opts: Address of a pointer into which to store the start of |
746 | * an options string appended to the end of the path with | |
747 | * a ':' separator. | |
c22e650e GL |
748 | * |
749 | * Valid paths: | |
750 | * /foo/bar Full path | |
751 | * foo Valid alias | |
752 | * foo/bar Valid alias + relative path | |
1ef4d424 SR |
753 | * |
754 | * Returns a node pointer with refcount incremented, use | |
755 | * of_node_put() on it when done. | |
756 | */ | |
75c28c09 | 757 | struct device_node *of_find_node_opts_by_path(const char *path, const char **opts) |
1ef4d424 | 758 | { |
c22e650e GL |
759 | struct device_node *np = NULL; |
760 | struct property *pp; | |
d6d3c4e6 | 761 | unsigned long flags; |
75c28c09 LL |
762 | const char *separator = strchr(path, ':'); |
763 | ||
764 | if (opts) | |
765 | *opts = separator ? separator + 1 : NULL; | |
1ef4d424 | 766 | |
c22e650e | 767 | if (strcmp(path, "/") == 0) |
5063e25a | 768 | return of_node_get(of_root); |
c22e650e GL |
769 | |
770 | /* The path could begin with an alias */ | |
771 | if (*path != '/') { | |
106937e8 LL |
772 | int len; |
773 | const char *p = separator; | |
774 | ||
775 | if (!p) | |
776 | p = strchrnul(path, '/'); | |
777 | len = p - path; | |
c22e650e GL |
778 | |
779 | /* of_aliases must not be NULL */ | |
780 | if (!of_aliases) | |
781 | return NULL; | |
782 | ||
783 | for_each_property_of_node(of_aliases, pp) { | |
784 | if (strlen(pp->name) == len && !strncmp(pp->name, path, len)) { | |
785 | np = of_find_node_by_path(pp->value); | |
786 | break; | |
787 | } | |
788 | } | |
789 | if (!np) | |
790 | return NULL; | |
791 | path = p; | |
792 | } | |
793 | ||
794 | /* Step down the tree matching path components */ | |
d6d3c4e6 | 795 | raw_spin_lock_irqsave(&devtree_lock, flags); |
c22e650e | 796 | if (!np) |
5063e25a | 797 | np = of_node_get(of_root); |
c22e650e GL |
798 | while (np && *path == '/') { |
799 | path++; /* Increment past '/' delimiter */ | |
800 | np = __of_find_node_by_path(np, path); | |
801 | path = strchrnul(path, '/'); | |
106937e8 LL |
802 | if (separator && separator < path) |
803 | break; | |
1ef4d424 | 804 | } |
d6d3c4e6 | 805 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
806 | return np; |
807 | } | |
75c28c09 | 808 | EXPORT_SYMBOL(of_find_node_opts_by_path); |
1ef4d424 SR |
809 | |
810 | /** | |
811 | * of_find_node_by_name - Find a node by its "name" property | |
812 | * @from: The node to start searching from or NULL, the node | |
813 | * you pass will not be searched, only the next one | |
814 | * will; typically, you pass what the previous call | |
815 | * returned. of_node_put() will be called on it | |
816 | * @name: The name string to match against | |
817 | * | |
818 | * Returns a node pointer with refcount incremented, use | |
819 | * of_node_put() on it when done. | |
820 | */ | |
821 | struct device_node *of_find_node_by_name(struct device_node *from, | |
822 | const char *name) | |
823 | { | |
824 | struct device_node *np; | |
d6d3c4e6 | 825 | unsigned long flags; |
1ef4d424 | 826 | |
d6d3c4e6 | 827 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 828 | for_each_of_allnodes_from(from, np) |
1ef4d424 SR |
829 | if (np->name && (of_node_cmp(np->name, name) == 0) |
830 | && of_node_get(np)) | |
831 | break; | |
832 | of_node_put(from); | |
d6d3c4e6 | 833 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
834 | return np; |
835 | } | |
836 | EXPORT_SYMBOL(of_find_node_by_name); | |
837 | ||
838 | /** | |
839 | * of_find_node_by_type - Find a node by its "device_type" property | |
840 | * @from: The node to start searching from, or NULL to start searching | |
841 | * the entire device tree. The node you pass will not be | |
842 | * searched, only the next one will; typically, you pass | |
843 | * what the previous call returned. of_node_put() will be | |
844 | * called on from for you. | |
845 | * @type: The type string to match against | |
846 | * | |
847 | * Returns a node pointer with refcount incremented, use | |
848 | * of_node_put() on it when done. | |
849 | */ | |
850 | struct device_node *of_find_node_by_type(struct device_node *from, | |
851 | const char *type) | |
852 | { | |
853 | struct device_node *np; | |
d6d3c4e6 | 854 | unsigned long flags; |
1ef4d424 | 855 | |
d6d3c4e6 | 856 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 857 | for_each_of_allnodes_from(from, np) |
1ef4d424 SR |
858 | if (np->type && (of_node_cmp(np->type, type) == 0) |
859 | && of_node_get(np)) | |
860 | break; | |
861 | of_node_put(from); | |
d6d3c4e6 | 862 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
863 | return np; |
864 | } | |
865 | EXPORT_SYMBOL(of_find_node_by_type); | |
866 | ||
867 | /** | |
868 | * of_find_compatible_node - Find a node based on type and one of the | |
869 | * tokens in its "compatible" property | |
870 | * @from: The node to start searching from or NULL, the node | |
871 | * you pass will not be searched, only the next one | |
872 | * will; typically, you pass what the previous call | |
873 | * returned. of_node_put() will be called on it | |
874 | * @type: The type string to match "device_type" or NULL to ignore | |
875 | * @compatible: The string to match to one of the tokens in the device | |
876 | * "compatible" list. | |
877 | * | |
878 | * Returns a node pointer with refcount incremented, use | |
879 | * of_node_put() on it when done. | |
880 | */ | |
881 | struct device_node *of_find_compatible_node(struct device_node *from, | |
882 | const char *type, const char *compatible) | |
883 | { | |
884 | struct device_node *np; | |
d6d3c4e6 | 885 | unsigned long flags; |
1ef4d424 | 886 | |
d6d3c4e6 | 887 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 888 | for_each_of_allnodes_from(from, np) |
215a14cf | 889 | if (__of_device_is_compatible(np, compatible, type, NULL) && |
28d0e36b | 890 | of_node_get(np)) |
1ef4d424 | 891 | break; |
1ef4d424 | 892 | of_node_put(from); |
d6d3c4e6 | 893 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
894 | return np; |
895 | } | |
896 | EXPORT_SYMBOL(of_find_compatible_node); | |
283029d1 | 897 | |
1e291b14 ME |
898 | /** |
899 | * of_find_node_with_property - Find a node which has a property with | |
900 | * the given name. | |
901 | * @from: The node to start searching from or NULL, the node | |
902 | * you pass will not be searched, only the next one | |
903 | * will; typically, you pass what the previous call | |
904 | * returned. of_node_put() will be called on it | |
905 | * @prop_name: The name of the property to look for. | |
906 | * | |
907 | * Returns a node pointer with refcount incremented, use | |
908 | * of_node_put() on it when done. | |
909 | */ | |
910 | struct device_node *of_find_node_with_property(struct device_node *from, | |
911 | const char *prop_name) | |
912 | { | |
913 | struct device_node *np; | |
914 | struct property *pp; | |
d6d3c4e6 | 915 | unsigned long flags; |
1e291b14 | 916 | |
d6d3c4e6 | 917 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 918 | for_each_of_allnodes_from(from, np) { |
a3a7cab1 | 919 | for (pp = np->properties; pp; pp = pp->next) { |
1e291b14 ME |
920 | if (of_prop_cmp(pp->name, prop_name) == 0) { |
921 | of_node_get(np); | |
922 | goto out; | |
923 | } | |
924 | } | |
925 | } | |
926 | out: | |
927 | of_node_put(from); | |
d6d3c4e6 | 928 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1e291b14 ME |
929 | return np; |
930 | } | |
931 | EXPORT_SYMBOL(of_find_node_with_property); | |
932 | ||
28d0e36b TG |
933 | static |
934 | const struct of_device_id *__of_match_node(const struct of_device_id *matches, | |
935 | const struct device_node *node) | |
283029d1 | 936 | { |
215a14cf KH |
937 | const struct of_device_id *best_match = NULL; |
938 | int score, best_score = 0; | |
939 | ||
a52f07ec GL |
940 | if (!matches) |
941 | return NULL; | |
942 | ||
215a14cf KH |
943 | for (; matches->name[0] || matches->type[0] || matches->compatible[0]; matches++) { |
944 | score = __of_device_is_compatible(node, matches->compatible, | |
945 | matches->type, matches->name); | |
946 | if (score > best_score) { | |
947 | best_match = matches; | |
948 | best_score = score; | |
949 | } | |
4e8ca6ee | 950 | } |
215a14cf KH |
951 | |
952 | return best_match; | |
283029d1 | 953 | } |
28d0e36b TG |
954 | |
955 | /** | |
c50949d3 | 956 | * of_match_node - Tell if a device_node has a matching of_match structure |
28d0e36b TG |
957 | * @matches: array of of device match structures to search in |
958 | * @node: the of device structure to match against | |
959 | * | |
71c5498e | 960 | * Low level utility function used by device matching. |
28d0e36b TG |
961 | */ |
962 | const struct of_device_id *of_match_node(const struct of_device_id *matches, | |
963 | const struct device_node *node) | |
964 | { | |
965 | const struct of_device_id *match; | |
d6d3c4e6 | 966 | unsigned long flags; |
28d0e36b | 967 | |
d6d3c4e6 | 968 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 969 | match = __of_match_node(matches, node); |
d6d3c4e6 | 970 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
971 | return match; |
972 | } | |
283029d1 GL |
973 | EXPORT_SYMBOL(of_match_node); |
974 | ||
975 | /** | |
50c8af4c SW |
976 | * of_find_matching_node_and_match - Find a node based on an of_device_id |
977 | * match table. | |
283029d1 GL |
978 | * @from: The node to start searching from or NULL, the node |
979 | * you pass will not be searched, only the next one | |
980 | * will; typically, you pass what the previous call | |
981 | * returned. of_node_put() will be called on it | |
982 | * @matches: array of of device match structures to search in | |
50c8af4c | 983 | * @match Updated to point at the matches entry which matched |
283029d1 GL |
984 | * |
985 | * Returns a node pointer with refcount incremented, use | |
986 | * of_node_put() on it when done. | |
987 | */ | |
50c8af4c SW |
988 | struct device_node *of_find_matching_node_and_match(struct device_node *from, |
989 | const struct of_device_id *matches, | |
990 | const struct of_device_id **match) | |
283029d1 GL |
991 | { |
992 | struct device_node *np; | |
dc71bcf1 | 993 | const struct of_device_id *m; |
d6d3c4e6 | 994 | unsigned long flags; |
283029d1 | 995 | |
50c8af4c SW |
996 | if (match) |
997 | *match = NULL; | |
998 | ||
d6d3c4e6 | 999 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1000 | for_each_of_allnodes_from(from, np) { |
28d0e36b | 1001 | m = __of_match_node(matches, np); |
dc71bcf1 | 1002 | if (m && of_node_get(np)) { |
50c8af4c | 1003 | if (match) |
dc71bcf1 | 1004 | *match = m; |
283029d1 | 1005 | break; |
50c8af4c | 1006 | } |
283029d1 GL |
1007 | } |
1008 | of_node_put(from); | |
d6d3c4e6 | 1009 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
283029d1 GL |
1010 | return np; |
1011 | } | |
80c2022e | 1012 | EXPORT_SYMBOL(of_find_matching_node_and_match); |
3f07af49 | 1013 | |
3f07af49 GL |
1014 | /** |
1015 | * of_modalias_node - Lookup appropriate modalias for a device node | |
1016 | * @node: pointer to a device tree node | |
1017 | * @modalias: Pointer to buffer that modalias value will be copied into | |
1018 | * @len: Length of modalias value | |
1019 | * | |
2ffe8c5f GL |
1020 | * Based on the value of the compatible property, this routine will attempt |
1021 | * to choose an appropriate modalias value for a particular device tree node. | |
1022 | * It does this by stripping the manufacturer prefix (as delimited by a ',') | |
1023 | * from the first entry in the compatible list property. | |
3f07af49 | 1024 | * |
2ffe8c5f | 1025 | * This routine returns 0 on success, <0 on failure. |
3f07af49 GL |
1026 | */ |
1027 | int of_modalias_node(struct device_node *node, char *modalias, int len) | |
1028 | { | |
2ffe8c5f GL |
1029 | const char *compatible, *p; |
1030 | int cplen; | |
3f07af49 GL |
1031 | |
1032 | compatible = of_get_property(node, "compatible", &cplen); | |
2ffe8c5f | 1033 | if (!compatible || strlen(compatible) > cplen) |
3f07af49 | 1034 | return -ENODEV; |
3f07af49 | 1035 | p = strchr(compatible, ','); |
2ffe8c5f | 1036 | strlcpy(modalias, p ? p + 1 : compatible, len); |
3f07af49 GL |
1037 | return 0; |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(of_modalias_node); | |
1040 | ||
89751a7c JK |
1041 | /** |
1042 | * of_find_node_by_phandle - Find a node given a phandle | |
1043 | * @handle: phandle of the node to find | |
1044 | * | |
1045 | * Returns a node pointer with refcount incremented, use | |
1046 | * of_node_put() on it when done. | |
1047 | */ | |
1048 | struct device_node *of_find_node_by_phandle(phandle handle) | |
1049 | { | |
1050 | struct device_node *np; | |
d25d8694 | 1051 | unsigned long flags; |
89751a7c | 1052 | |
fc59b447 GL |
1053 | if (!handle) |
1054 | return NULL; | |
1055 | ||
d25d8694 | 1056 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1057 | for_each_of_allnodes(np) |
89751a7c JK |
1058 | if (np->phandle == handle) |
1059 | break; | |
1060 | of_node_get(np); | |
d25d8694 | 1061 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
89751a7c JK |
1062 | return np; |
1063 | } | |
1064 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
1065 | ||
ad54a0cf HS |
1066 | /** |
1067 | * of_property_count_elems_of_size - Count the number of elements in a property | |
1068 | * | |
1069 | * @np: device node from which the property value is to be read. | |
1070 | * @propname: name of the property to be searched. | |
1071 | * @elem_size: size of the individual element | |
1072 | * | |
1073 | * Search for a property in a device node and count the number of elements of | |
1074 | * size elem_size in it. Returns number of elements on sucess, -EINVAL if the | |
1075 | * property does not exist or its length does not match a multiple of elem_size | |
1076 | * and -ENODATA if the property does not have a value. | |
1077 | */ | |
1078 | int of_property_count_elems_of_size(const struct device_node *np, | |
1079 | const char *propname, int elem_size) | |
1080 | { | |
1081 | struct property *prop = of_find_property(np, propname, NULL); | |
1082 | ||
1083 | if (!prop) | |
1084 | return -EINVAL; | |
1085 | if (!prop->value) | |
1086 | return -ENODATA; | |
1087 | ||
1088 | if (prop->length % elem_size != 0) { | |
1089 | pr_err("size of %s in node %s is not a multiple of %d\n", | |
1090 | propname, np->full_name, elem_size); | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | ||
1094 | return prop->length / elem_size; | |
1095 | } | |
1096 | EXPORT_SYMBOL_GPL(of_property_count_elems_of_size); | |
1097 | ||
daeec1f0 TP |
1098 | /** |
1099 | * of_find_property_value_of_size | |
1100 | * | |
1101 | * @np: device node from which the property value is to be read. | |
1102 | * @propname: name of the property to be searched. | |
1103 | * @len: requested length of property value | |
1104 | * | |
1105 | * Search for a property in a device node and valid the requested size. | |
1106 | * Returns the property value on success, -EINVAL if the property does not | |
1107 | * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1108 | * property data isn't large enough. | |
1109 | * | |
1110 | */ | |
1111 | static void *of_find_property_value_of_size(const struct device_node *np, | |
1112 | const char *propname, u32 len) | |
1113 | { | |
1114 | struct property *prop = of_find_property(np, propname, NULL); | |
1115 | ||
1116 | if (!prop) | |
1117 | return ERR_PTR(-EINVAL); | |
1118 | if (!prop->value) | |
1119 | return ERR_PTR(-ENODATA); | |
1120 | if (len > prop->length) | |
1121 | return ERR_PTR(-EOVERFLOW); | |
1122 | ||
1123 | return prop->value; | |
1124 | } | |
1125 | ||
3daf3726 TP |
1126 | /** |
1127 | * of_property_read_u32_index - Find and read a u32 from a multi-value property. | |
1128 | * | |
1129 | * @np: device node from which the property value is to be read. | |
1130 | * @propname: name of the property to be searched. | |
1131 | * @index: index of the u32 in the list of values | |
1132 | * @out_value: pointer to return value, modified only if no error. | |
1133 | * | |
1134 | * Search for a property in a device node and read nth 32-bit value from | |
1135 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
1136 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1137 | * property data isn't large enough. | |
1138 | * | |
1139 | * The out_value is modified only if a valid u32 value can be decoded. | |
1140 | */ | |
1141 | int of_property_read_u32_index(const struct device_node *np, | |
1142 | const char *propname, | |
1143 | u32 index, u32 *out_value) | |
1144 | { | |
daeec1f0 TP |
1145 | const u32 *val = of_find_property_value_of_size(np, propname, |
1146 | ((index + 1) * sizeof(*out_value))); | |
3daf3726 | 1147 | |
daeec1f0 TP |
1148 | if (IS_ERR(val)) |
1149 | return PTR_ERR(val); | |
3daf3726 | 1150 | |
daeec1f0 | 1151 | *out_value = be32_to_cpup(((__be32 *)val) + index); |
3daf3726 TP |
1152 | return 0; |
1153 | } | |
1154 | EXPORT_SYMBOL_GPL(of_property_read_u32_index); | |
1155 | ||
be193249 VK |
1156 | /** |
1157 | * of_property_read_u8_array - Find and read an array of u8 from a property. | |
1158 | * | |
1159 | * @np: device node from which the property value is to be read. | |
1160 | * @propname: name of the property to be searched. | |
792efb84 | 1161 | * @out_values: pointer to return value, modified only if return value is 0. |
be193249 VK |
1162 | * @sz: number of array elements to read |
1163 | * | |
1164 | * Search for a property in a device node and read 8-bit value(s) from | |
1165 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
1166 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1167 | * property data isn't large enough. | |
1168 | * | |
1169 | * dts entry of array should be like: | |
1170 | * property = /bits/ 8 <0x50 0x60 0x70>; | |
1171 | * | |
792efb84 | 1172 | * The out_values is modified only if a valid u8 value can be decoded. |
be193249 VK |
1173 | */ |
1174 | int of_property_read_u8_array(const struct device_node *np, | |
1175 | const char *propname, u8 *out_values, size_t sz) | |
1176 | { | |
daeec1f0 TP |
1177 | const u8 *val = of_find_property_value_of_size(np, propname, |
1178 | (sz * sizeof(*out_values))); | |
be193249 | 1179 | |
daeec1f0 TP |
1180 | if (IS_ERR(val)) |
1181 | return PTR_ERR(val); | |
be193249 | 1182 | |
be193249 VK |
1183 | while (sz--) |
1184 | *out_values++ = *val++; | |
1185 | return 0; | |
1186 | } | |
1187 | EXPORT_SYMBOL_GPL(of_property_read_u8_array); | |
1188 | ||
1189 | /** | |
1190 | * of_property_read_u16_array - Find and read an array of u16 from a property. | |
1191 | * | |
1192 | * @np: device node from which the property value is to be read. | |
1193 | * @propname: name of the property to be searched. | |
792efb84 | 1194 | * @out_values: pointer to return value, modified only if return value is 0. |
be193249 VK |
1195 | * @sz: number of array elements to read |
1196 | * | |
1197 | * Search for a property in a device node and read 16-bit value(s) from | |
1198 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
1199 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1200 | * property data isn't large enough. | |
1201 | * | |
1202 | * dts entry of array should be like: | |
1203 | * property = /bits/ 16 <0x5000 0x6000 0x7000>; | |
1204 | * | |
792efb84 | 1205 | * The out_values is modified only if a valid u16 value can be decoded. |
be193249 VK |
1206 | */ |
1207 | int of_property_read_u16_array(const struct device_node *np, | |
1208 | const char *propname, u16 *out_values, size_t sz) | |
1209 | { | |
daeec1f0 TP |
1210 | const __be16 *val = of_find_property_value_of_size(np, propname, |
1211 | (sz * sizeof(*out_values))); | |
be193249 | 1212 | |
daeec1f0 TP |
1213 | if (IS_ERR(val)) |
1214 | return PTR_ERR(val); | |
be193249 | 1215 | |
be193249 VK |
1216 | while (sz--) |
1217 | *out_values++ = be16_to_cpup(val++); | |
1218 | return 0; | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(of_property_read_u16_array); | |
1221 | ||
a3b85363 | 1222 | /** |
0e373639 RH |
1223 | * of_property_read_u32_array - Find and read an array of 32 bit integers |
1224 | * from a property. | |
1225 | * | |
a3b85363 TA |
1226 | * @np: device node from which the property value is to be read. |
1227 | * @propname: name of the property to be searched. | |
792efb84 | 1228 | * @out_values: pointer to return value, modified only if return value is 0. |
be193249 | 1229 | * @sz: number of array elements to read |
a3b85363 | 1230 | * |
0e373639 | 1231 | * Search for a property in a device node and read 32-bit value(s) from |
a3b85363 TA |
1232 | * it. Returns 0 on success, -EINVAL if the property does not exist, |
1233 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1234 | * property data isn't large enough. | |
1235 | * | |
792efb84 | 1236 | * The out_values is modified only if a valid u32 value can be decoded. |
a3b85363 | 1237 | */ |
aac285c6 JI |
1238 | int of_property_read_u32_array(const struct device_node *np, |
1239 | const char *propname, u32 *out_values, | |
1240 | size_t sz) | |
a3b85363 | 1241 | { |
daeec1f0 TP |
1242 | const __be32 *val = of_find_property_value_of_size(np, propname, |
1243 | (sz * sizeof(*out_values))); | |
a3b85363 | 1244 | |
daeec1f0 TP |
1245 | if (IS_ERR(val)) |
1246 | return PTR_ERR(val); | |
0e373639 | 1247 | |
0e373639 RH |
1248 | while (sz--) |
1249 | *out_values++ = be32_to_cpup(val++); | |
a3b85363 TA |
1250 | return 0; |
1251 | } | |
0e373639 | 1252 | EXPORT_SYMBOL_GPL(of_property_read_u32_array); |
a3b85363 | 1253 | |
4cd7f7a3 JI |
1254 | /** |
1255 | * of_property_read_u64 - Find and read a 64 bit integer from a property | |
1256 | * @np: device node from which the property value is to be read. | |
1257 | * @propname: name of the property to be searched. | |
1258 | * @out_value: pointer to return value, modified only if return value is 0. | |
1259 | * | |
1260 | * Search for a property in a device node and read a 64-bit value from | |
1261 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
1262 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1263 | * property data isn't large enough. | |
1264 | * | |
1265 | * The out_value is modified only if a valid u64 value can be decoded. | |
1266 | */ | |
1267 | int of_property_read_u64(const struct device_node *np, const char *propname, | |
1268 | u64 *out_value) | |
1269 | { | |
daeec1f0 TP |
1270 | const __be32 *val = of_find_property_value_of_size(np, propname, |
1271 | sizeof(*out_value)); | |
4cd7f7a3 | 1272 | |
daeec1f0 TP |
1273 | if (IS_ERR(val)) |
1274 | return PTR_ERR(val); | |
1275 | ||
1276 | *out_value = of_read_number(val, 2); | |
4cd7f7a3 JI |
1277 | return 0; |
1278 | } | |
1279 | EXPORT_SYMBOL_GPL(of_property_read_u64); | |
1280 | ||
b31384fa RW |
1281 | /** |
1282 | * of_property_read_u64_array - Find and read an array of 64 bit integers | |
1283 | * from a property. | |
1284 | * | |
1285 | * @np: device node from which the property value is to be read. | |
1286 | * @propname: name of the property to be searched. | |
1287 | * @out_values: pointer to return value, modified only if return value is 0. | |
1288 | * @sz: number of array elements to read | |
1289 | * | |
1290 | * Search for a property in a device node and read 64-bit value(s) from | |
1291 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
1292 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
1293 | * property data isn't large enough. | |
1294 | * | |
1295 | * The out_values is modified only if a valid u64 value can be decoded. | |
1296 | */ | |
1297 | int of_property_read_u64_array(const struct device_node *np, | |
1298 | const char *propname, u64 *out_values, | |
1299 | size_t sz) | |
1300 | { | |
1301 | const __be32 *val = of_find_property_value_of_size(np, propname, | |
1302 | (sz * sizeof(*out_values))); | |
1303 | ||
1304 | if (IS_ERR(val)) | |
1305 | return PTR_ERR(val); | |
1306 | ||
1307 | while (sz--) { | |
1308 | *out_values++ = of_read_number(val, 2); | |
1309 | val += 2; | |
1310 | } | |
1311 | return 0; | |
1312 | } | |
2d4c0aef | 1313 | EXPORT_SYMBOL_GPL(of_property_read_u64_array); |
b31384fa | 1314 | |
a3b85363 TA |
1315 | /** |
1316 | * of_property_read_string - Find and read a string from a property | |
1317 | * @np: device node from which the property value is to be read. | |
1318 | * @propname: name of the property to be searched. | |
1319 | * @out_string: pointer to null terminated return string, modified only if | |
1320 | * return value is 0. | |
1321 | * | |
1322 | * Search for a property in a device tree node and retrieve a null | |
1323 | * terminated string value (pointer to data, not a copy). Returns 0 on | |
1324 | * success, -EINVAL if the property does not exist, -ENODATA if property | |
1325 | * does not have a value, and -EILSEQ if the string is not null-terminated | |
1326 | * within the length of the property data. | |
1327 | * | |
1328 | * The out_string pointer is modified only if a valid string can be decoded. | |
1329 | */ | |
aac285c6 | 1330 | int of_property_read_string(struct device_node *np, const char *propname, |
f09bc831 | 1331 | const char **out_string) |
a3b85363 TA |
1332 | { |
1333 | struct property *prop = of_find_property(np, propname, NULL); | |
1334 | if (!prop) | |
1335 | return -EINVAL; | |
1336 | if (!prop->value) | |
1337 | return -ENODATA; | |
1338 | if (strnlen(prop->value, prop->length) >= prop->length) | |
1339 | return -EILSEQ; | |
1340 | *out_string = prop->value; | |
1341 | return 0; | |
1342 | } | |
1343 | EXPORT_SYMBOL_GPL(of_property_read_string); | |
1344 | ||
7aff0fe3 GL |
1345 | /** |
1346 | * of_property_match_string() - Find string in a list and return index | |
1347 | * @np: pointer to node containing string list property | |
1348 | * @propname: string list property name | |
1349 | * @string: pointer to string to search for in string list | |
1350 | * | |
1351 | * This function searches a string list property and returns the index | |
1352 | * of a specific string value. | |
1353 | */ | |
1354 | int of_property_match_string(struct device_node *np, const char *propname, | |
1355 | const char *string) | |
1356 | { | |
1357 | struct property *prop = of_find_property(np, propname, NULL); | |
1358 | size_t l; | |
1359 | int i; | |
1360 | const char *p, *end; | |
1361 | ||
1362 | if (!prop) | |
1363 | return -EINVAL; | |
1364 | if (!prop->value) | |
1365 | return -ENODATA; | |
1366 | ||
1367 | p = prop->value; | |
1368 | end = p + prop->length; | |
1369 | ||
1370 | for (i = 0; p < end; i++, p += l) { | |
a87fa1d8 | 1371 | l = strnlen(p, end - p) + 1; |
7aff0fe3 GL |
1372 | if (p + l > end) |
1373 | return -EILSEQ; | |
1374 | pr_debug("comparing %s with %s\n", string, p); | |
1375 | if (strcmp(string, p) == 0) | |
1376 | return i; /* Found it; return index */ | |
1377 | } | |
1378 | return -ENODATA; | |
1379 | } | |
1380 | EXPORT_SYMBOL_GPL(of_property_match_string); | |
4fcd15a0 BC |
1381 | |
1382 | /** | |
e99010ed | 1383 | * of_property_read_string_helper() - Utility helper for parsing string properties |
4fcd15a0 BC |
1384 | * @np: device node from which the property value is to be read. |
1385 | * @propname: name of the property to be searched. | |
a87fa1d8 GL |
1386 | * @out_strs: output array of string pointers. |
1387 | * @sz: number of array elements to read. | |
1388 | * @skip: Number of strings to skip over at beginning of list. | |
4fcd15a0 | 1389 | * |
a87fa1d8 GL |
1390 | * Don't call this function directly. It is a utility helper for the |
1391 | * of_property_read_string*() family of functions. | |
4fcd15a0 | 1392 | */ |
a87fa1d8 GL |
1393 | int of_property_read_string_helper(struct device_node *np, const char *propname, |
1394 | const char **out_strs, size_t sz, int skip) | |
4fcd15a0 BC |
1395 | { |
1396 | struct property *prop = of_find_property(np, propname, NULL); | |
a87fa1d8 GL |
1397 | int l = 0, i = 0; |
1398 | const char *p, *end; | |
4fcd15a0 BC |
1399 | |
1400 | if (!prop) | |
1401 | return -EINVAL; | |
1402 | if (!prop->value) | |
1403 | return -ENODATA; | |
4fcd15a0 | 1404 | p = prop->value; |
a87fa1d8 | 1405 | end = p + prop->length; |
4fcd15a0 | 1406 | |
a87fa1d8 GL |
1407 | for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) { |
1408 | l = strnlen(p, end - p) + 1; | |
1409 | if (p + l > end) | |
1410 | return -EILSEQ; | |
1411 | if (out_strs && i >= skip) | |
1412 | *out_strs++ = p; | |
1413 | } | |
1414 | i -= skip; | |
1415 | return i <= 0 ? -ENODATA : i; | |
4fcd15a0 | 1416 | } |
a87fa1d8 | 1417 | EXPORT_SYMBOL_GPL(of_property_read_string_helper); |
4fcd15a0 | 1418 | |
624cfca5 GL |
1419 | void of_print_phandle_args(const char *msg, const struct of_phandle_args *args) |
1420 | { | |
1421 | int i; | |
1422 | printk("%s %s", msg, of_node_full_name(args->np)); | |
1423 | for (i = 0; i < args->args_count; i++) | |
1424 | printk(i ? ",%08x" : ":%08x", args->args[i]); | |
1425 | printk("\n"); | |
1426 | } | |
1427 | ||
bd69f73f GL |
1428 | static int __of_parse_phandle_with_args(const struct device_node *np, |
1429 | const char *list_name, | |
035fd948 SW |
1430 | const char *cells_name, |
1431 | int cell_count, int index, | |
bd69f73f | 1432 | struct of_phandle_args *out_args) |
64b60e09 | 1433 | { |
15c9a0ac | 1434 | const __be32 *list, *list_end; |
23ce04c0 | 1435 | int rc = 0, size, cur_index = 0; |
15c9a0ac | 1436 | uint32_t count = 0; |
64b60e09 | 1437 | struct device_node *node = NULL; |
15c9a0ac | 1438 | phandle phandle; |
64b60e09 | 1439 | |
15c9a0ac | 1440 | /* Retrieve the phandle list property */ |
64b60e09 | 1441 | list = of_get_property(np, list_name, &size); |
15c9a0ac | 1442 | if (!list) |
1af4c7f1 | 1443 | return -ENOENT; |
64b60e09 AV |
1444 | list_end = list + size / sizeof(*list); |
1445 | ||
15c9a0ac | 1446 | /* Loop over the phandles until all the requested entry is found */ |
64b60e09 | 1447 | while (list < list_end) { |
23ce04c0 | 1448 | rc = -EINVAL; |
15c9a0ac | 1449 | count = 0; |
64b60e09 | 1450 | |
15c9a0ac GL |
1451 | /* |
1452 | * If phandle is 0, then it is an empty entry with no | |
1453 | * arguments. Skip forward to the next entry. | |
1454 | */ | |
9a6b2e58 | 1455 | phandle = be32_to_cpup(list++); |
15c9a0ac GL |
1456 | if (phandle) { |
1457 | /* | |
1458 | * Find the provider node and parse the #*-cells | |
91d9942c SW |
1459 | * property to determine the argument length. |
1460 | * | |
1461 | * This is not needed if the cell count is hard-coded | |
1462 | * (i.e. cells_name not set, but cell_count is set), | |
1463 | * except when we're going to return the found node | |
1464 | * below. | |
15c9a0ac | 1465 | */ |
91d9942c SW |
1466 | if (cells_name || cur_index == index) { |
1467 | node = of_find_node_by_phandle(phandle); | |
1468 | if (!node) { | |
1469 | pr_err("%s: could not find phandle\n", | |
1470 | np->full_name); | |
1471 | goto err; | |
1472 | } | |
15c9a0ac | 1473 | } |
035fd948 SW |
1474 | |
1475 | if (cells_name) { | |
1476 | if (of_property_read_u32(node, cells_name, | |
1477 | &count)) { | |
1478 | pr_err("%s: could not get %s for %s\n", | |
1479 | np->full_name, cells_name, | |
1480 | node->full_name); | |
1481 | goto err; | |
1482 | } | |
1483 | } else { | |
1484 | count = cell_count; | |
15c9a0ac | 1485 | } |
64b60e09 | 1486 | |
15c9a0ac GL |
1487 | /* |
1488 | * Make sure that the arguments actually fit in the | |
1489 | * remaining property data length | |
1490 | */ | |
1491 | if (list + count > list_end) { | |
1492 | pr_err("%s: arguments longer than property\n", | |
1493 | np->full_name); | |
23ce04c0 | 1494 | goto err; |
15c9a0ac | 1495 | } |
64b60e09 AV |
1496 | } |
1497 | ||
15c9a0ac GL |
1498 | /* |
1499 | * All of the error cases above bail out of the loop, so at | |
1500 | * this point, the parsing is successful. If the requested | |
1501 | * index matches, then fill the out_args structure and return, | |
1502 | * or return -ENOENT for an empty entry. | |
1503 | */ | |
23ce04c0 | 1504 | rc = -ENOENT; |
15c9a0ac GL |
1505 | if (cur_index == index) { |
1506 | if (!phandle) | |
23ce04c0 | 1507 | goto err; |
15c9a0ac GL |
1508 | |
1509 | if (out_args) { | |
1510 | int i; | |
1511 | if (WARN_ON(count > MAX_PHANDLE_ARGS)) | |
1512 | count = MAX_PHANDLE_ARGS; | |
1513 | out_args->np = node; | |
1514 | out_args->args_count = count; | |
1515 | for (i = 0; i < count; i++) | |
1516 | out_args->args[i] = be32_to_cpup(list++); | |
b855f16b TY |
1517 | } else { |
1518 | of_node_put(node); | |
15c9a0ac | 1519 | } |
23ce04c0 GL |
1520 | |
1521 | /* Found it! return success */ | |
15c9a0ac | 1522 | return 0; |
64b60e09 | 1523 | } |
64b60e09 AV |
1524 | |
1525 | of_node_put(node); | |
1526 | node = NULL; | |
15c9a0ac | 1527 | list += count; |
64b60e09 AV |
1528 | cur_index++; |
1529 | } | |
1530 | ||
23ce04c0 GL |
1531 | /* |
1532 | * Unlock node before returning result; will be one of: | |
1533 | * -ENOENT : index is for empty phandle | |
1534 | * -EINVAL : parsing error on data | |
bd69f73f | 1535 | * [1..n] : Number of phandle (count mode; when index = -1) |
23ce04c0 | 1536 | */ |
bd69f73f | 1537 | rc = index < 0 ? cur_index : -ENOENT; |
23ce04c0 | 1538 | err: |
15c9a0ac GL |
1539 | if (node) |
1540 | of_node_put(node); | |
23ce04c0 | 1541 | return rc; |
64b60e09 | 1542 | } |
bd69f73f | 1543 | |
5fba49e3 SW |
1544 | /** |
1545 | * of_parse_phandle - Resolve a phandle property to a device_node pointer | |
1546 | * @np: Pointer to device node holding phandle property | |
1547 | * @phandle_name: Name of property holding a phandle value | |
1548 | * @index: For properties holding a table of phandles, this is the index into | |
1549 | * the table | |
1550 | * | |
1551 | * Returns the device_node pointer with refcount incremented. Use | |
1552 | * of_node_put() on it when done. | |
1553 | */ | |
1554 | struct device_node *of_parse_phandle(const struct device_node *np, | |
1555 | const char *phandle_name, int index) | |
1556 | { | |
91d9942c SW |
1557 | struct of_phandle_args args; |
1558 | ||
1559 | if (index < 0) | |
1560 | return NULL; | |
5fba49e3 | 1561 | |
91d9942c SW |
1562 | if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0, |
1563 | index, &args)) | |
5fba49e3 SW |
1564 | return NULL; |
1565 | ||
91d9942c | 1566 | return args.np; |
5fba49e3 SW |
1567 | } |
1568 | EXPORT_SYMBOL(of_parse_phandle); | |
1569 | ||
eded9dd4 SW |
1570 | /** |
1571 | * of_parse_phandle_with_args() - Find a node pointed by phandle in a list | |
1572 | * @np: pointer to a device tree node containing a list | |
1573 | * @list_name: property name that contains a list | |
1574 | * @cells_name: property name that specifies phandles' arguments count | |
1575 | * @index: index of a phandle to parse out | |
1576 | * @out_args: optional pointer to output arguments structure (will be filled) | |
1577 | * | |
1578 | * This function is useful to parse lists of phandles and their arguments. | |
1579 | * Returns 0 on success and fills out_args, on error returns appropriate | |
1580 | * errno value. | |
1581 | * | |
d94a75c1 | 1582 | * Caller is responsible to call of_node_put() on the returned out_args->np |
eded9dd4 SW |
1583 | * pointer. |
1584 | * | |
1585 | * Example: | |
1586 | * | |
1587 | * phandle1: node1 { | |
c0e848d8 | 1588 | * #list-cells = <2>; |
eded9dd4 SW |
1589 | * } |
1590 | * | |
1591 | * phandle2: node2 { | |
c0e848d8 | 1592 | * #list-cells = <1>; |
eded9dd4 SW |
1593 | * } |
1594 | * | |
1595 | * node3 { | |
c0e848d8 | 1596 | * list = <&phandle1 1 2 &phandle2 3>; |
eded9dd4 SW |
1597 | * } |
1598 | * | |
1599 | * To get a device_node of the `node2' node you may call this: | |
1600 | * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args); | |
1601 | */ | |
bd69f73f GL |
1602 | int of_parse_phandle_with_args(const struct device_node *np, const char *list_name, |
1603 | const char *cells_name, int index, | |
1604 | struct of_phandle_args *out_args) | |
1605 | { | |
1606 | if (index < 0) | |
1607 | return -EINVAL; | |
035fd948 SW |
1608 | return __of_parse_phandle_with_args(np, list_name, cells_name, 0, |
1609 | index, out_args); | |
bd69f73f | 1610 | } |
15c9a0ac | 1611 | EXPORT_SYMBOL(of_parse_phandle_with_args); |
02af11b0 | 1612 | |
035fd948 SW |
1613 | /** |
1614 | * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a list | |
1615 | * @np: pointer to a device tree node containing a list | |
1616 | * @list_name: property name that contains a list | |
1617 | * @cell_count: number of argument cells following the phandle | |
1618 | * @index: index of a phandle to parse out | |
1619 | * @out_args: optional pointer to output arguments structure (will be filled) | |
1620 | * | |
1621 | * This function is useful to parse lists of phandles and their arguments. | |
1622 | * Returns 0 on success and fills out_args, on error returns appropriate | |
1623 | * errno value. | |
1624 | * | |
d94a75c1 | 1625 | * Caller is responsible to call of_node_put() on the returned out_args->np |
035fd948 SW |
1626 | * pointer. |
1627 | * | |
1628 | * Example: | |
1629 | * | |
1630 | * phandle1: node1 { | |
1631 | * } | |
1632 | * | |
1633 | * phandle2: node2 { | |
1634 | * } | |
1635 | * | |
1636 | * node3 { | |
c0e848d8 | 1637 | * list = <&phandle1 0 2 &phandle2 2 3>; |
035fd948 SW |
1638 | * } |
1639 | * | |
1640 | * To get a device_node of the `node2' node you may call this: | |
1641 | * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args); | |
1642 | */ | |
1643 | int of_parse_phandle_with_fixed_args(const struct device_node *np, | |
1644 | const char *list_name, int cell_count, | |
1645 | int index, struct of_phandle_args *out_args) | |
1646 | { | |
1647 | if (index < 0) | |
1648 | return -EINVAL; | |
1649 | return __of_parse_phandle_with_args(np, list_name, NULL, cell_count, | |
1650 | index, out_args); | |
1651 | } | |
1652 | EXPORT_SYMBOL(of_parse_phandle_with_fixed_args); | |
1653 | ||
bd69f73f GL |
1654 | /** |
1655 | * of_count_phandle_with_args() - Find the number of phandles references in a property | |
1656 | * @np: pointer to a device tree node containing a list | |
1657 | * @list_name: property name that contains a list | |
1658 | * @cells_name: property name that specifies phandles' arguments count | |
1659 | * | |
1660 | * Returns the number of phandle + argument tuples within a property. It | |
1661 | * is a typical pattern to encode a list of phandle and variable | |
1662 | * arguments into a single property. The number of arguments is encoded | |
1663 | * by a property in the phandle-target node. For example, a gpios | |
1664 | * property would contain a list of GPIO specifies consisting of a | |
1665 | * phandle and 1 or more arguments. The number of arguments are | |
1666 | * determined by the #gpio-cells property in the node pointed to by the | |
1667 | * phandle. | |
1668 | */ | |
1669 | int of_count_phandle_with_args(const struct device_node *np, const char *list_name, | |
1670 | const char *cells_name) | |
1671 | { | |
035fd948 SW |
1672 | return __of_parse_phandle_with_args(np, list_name, cells_name, 0, -1, |
1673 | NULL); | |
bd69f73f GL |
1674 | } |
1675 | EXPORT_SYMBOL(of_count_phandle_with_args); | |
1676 | ||
62664f67 XL |
1677 | /** |
1678 | * __of_add_property - Add a property to a node without lock operations | |
1679 | */ | |
d8c50088 | 1680 | int __of_add_property(struct device_node *np, struct property *prop) |
62664f67 XL |
1681 | { |
1682 | struct property **next; | |
1683 | ||
1684 | prop->next = NULL; | |
1685 | next = &np->properties; | |
1686 | while (*next) { | |
1687 | if (strcmp(prop->name, (*next)->name) == 0) | |
1688 | /* duplicate ! don't insert it */ | |
1689 | return -EEXIST; | |
1690 | ||
1691 | next = &(*next)->next; | |
1692 | } | |
1693 | *next = prop; | |
1694 | ||
1695 | return 0; | |
1696 | } | |
1697 | ||
02af11b0 | 1698 | /** |
79d1c712 | 1699 | * of_add_property - Add a property to a node |
02af11b0 | 1700 | */ |
79d1c712 | 1701 | int of_add_property(struct device_node *np, struct property *prop) |
02af11b0 | 1702 | { |
02af11b0 | 1703 | unsigned long flags; |
1cf3d8b3 NF |
1704 | int rc; |
1705 | ||
8a2b22a2 | 1706 | mutex_lock(&of_mutex); |
02af11b0 | 1707 | |
d6d3c4e6 | 1708 | raw_spin_lock_irqsave(&devtree_lock, flags); |
62664f67 | 1709 | rc = __of_add_property(np, prop); |
d6d3c4e6 | 1710 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 | 1711 | |
8a2b22a2 | 1712 | if (!rc) |
0829f6d1 | 1713 | __of_add_property_sysfs(np, prop); |
02af11b0 | 1714 | |
8a2b22a2 GL |
1715 | mutex_unlock(&of_mutex); |
1716 | ||
259092a3 GL |
1717 | if (!rc) |
1718 | of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop, NULL); | |
1719 | ||
62664f67 | 1720 | return rc; |
02af11b0 GL |
1721 | } |
1722 | ||
d8c50088 PA |
1723 | int __of_remove_property(struct device_node *np, struct property *prop) |
1724 | { | |
1725 | struct property **next; | |
1726 | ||
1727 | for (next = &np->properties; *next; next = &(*next)->next) { | |
1728 | if (*next == prop) | |
1729 | break; | |
1730 | } | |
1731 | if (*next == NULL) | |
1732 | return -ENODEV; | |
1733 | ||
1734 | /* found the node */ | |
1735 | *next = prop->next; | |
1736 | prop->next = np->deadprops; | |
1737 | np->deadprops = prop; | |
1738 | ||
1739 | return 0; | |
1740 | } | |
1741 | ||
8a2b22a2 GL |
1742 | void __of_remove_property_sysfs(struct device_node *np, struct property *prop) |
1743 | { | |
ef69d740 GM |
1744 | if (!IS_ENABLED(CONFIG_SYSFS)) |
1745 | return; | |
1746 | ||
8a2b22a2 GL |
1747 | /* at early boot, bail here and defer setup to of_init() */ |
1748 | if (of_kset && of_node_is_attached(np)) | |
1749 | sysfs_remove_bin_file(&np->kobj, &prop->attr); | |
1750 | } | |
1751 | ||
02af11b0 | 1752 | /** |
79d1c712 | 1753 | * of_remove_property - Remove a property from a node. |
02af11b0 GL |
1754 | * |
1755 | * Note that we don't actually remove it, since we have given out | |
1756 | * who-knows-how-many pointers to the data using get-property. | |
1757 | * Instead we just move the property to the "dead properties" | |
1758 | * list, so it won't be found any more. | |
1759 | */ | |
79d1c712 | 1760 | int of_remove_property(struct device_node *np, struct property *prop) |
02af11b0 | 1761 | { |
02af11b0 | 1762 | unsigned long flags; |
1cf3d8b3 NF |
1763 | int rc; |
1764 | ||
8a2b22a2 | 1765 | mutex_lock(&of_mutex); |
02af11b0 | 1766 | |
d6d3c4e6 | 1767 | raw_spin_lock_irqsave(&devtree_lock, flags); |
d8c50088 | 1768 | rc = __of_remove_property(np, prop); |
d6d3c4e6 | 1769 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 | 1770 | |
8a2b22a2 GL |
1771 | if (!rc) |
1772 | __of_remove_property_sysfs(np, prop); | |
02af11b0 | 1773 | |
8a2b22a2 | 1774 | mutex_unlock(&of_mutex); |
75b57ecf | 1775 | |
259092a3 GL |
1776 | if (!rc) |
1777 | of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop, NULL); | |
02af11b0 | 1778 | |
8a2b22a2 | 1779 | return rc; |
02af11b0 GL |
1780 | } |
1781 | ||
d8c50088 PA |
1782 | int __of_update_property(struct device_node *np, struct property *newprop, |
1783 | struct property **oldpropp) | |
02af11b0 | 1784 | { |
475d0094 | 1785 | struct property **next, *oldprop; |
02af11b0 | 1786 | |
d8c50088 PA |
1787 | for (next = &np->properties; *next; next = &(*next)->next) { |
1788 | if (of_prop_cmp((*next)->name, newprop->name) == 0) | |
1789 | break; | |
1790 | } | |
1791 | *oldpropp = oldprop = *next; | |
475d0094 | 1792 | |
d8c50088 | 1793 | if (oldprop) { |
947fdaad | 1794 | /* replace the node */ |
d8c50088 PA |
1795 | newprop->next = oldprop->next; |
1796 | *next = newprop; | |
1797 | oldprop->next = np->deadprops; | |
1798 | np->deadprops = oldprop; | |
1799 | } else { | |
1800 | /* new node */ | |
1801 | newprop->next = NULL; | |
1802 | *next = newprop; | |
02af11b0 | 1803 | } |
75b57ecf | 1804 | |
d8c50088 PA |
1805 | return 0; |
1806 | } | |
1807 | ||
8a2b22a2 GL |
1808 | void __of_update_property_sysfs(struct device_node *np, struct property *newprop, |
1809 | struct property *oldprop) | |
1810 | { | |
ef69d740 GM |
1811 | if (!IS_ENABLED(CONFIG_SYSFS)) |
1812 | return; | |
1813 | ||
582da652 TP |
1814 | /* At early boot, bail out and defer setup to of_init() */ |
1815 | if (!of_kset) | |
8a2b22a2 | 1816 | return; |
582da652 | 1817 | |
947fdaad XL |
1818 | if (oldprop) |
1819 | sysfs_remove_bin_file(&np->kobj, &oldprop->attr); | |
75b57ecf | 1820 | __of_add_property_sysfs(np, newprop); |
02af11b0 | 1821 | } |
fcdeb7fe | 1822 | |
fcdeb7fe | 1823 | /* |
79d1c712 | 1824 | * of_update_property - Update a property in a node, if the property does |
475d0094 | 1825 | * not exist, add it. |
fcdeb7fe | 1826 | * |
02af11b0 GL |
1827 | * Note that we don't actually remove it, since we have given out |
1828 | * who-knows-how-many pointers to the data using get-property. | |
1829 | * Instead we just move the property to the "dead properties" list, | |
1830 | * and add the new property to the property list | |
fcdeb7fe | 1831 | */ |
79d1c712 | 1832 | int of_update_property(struct device_node *np, struct property *newprop) |
fcdeb7fe | 1833 | { |
d8c50088 | 1834 | struct property *oldprop; |
fcdeb7fe | 1835 | unsigned long flags; |
1cf3d8b3 NF |
1836 | int rc; |
1837 | ||
d8c50088 PA |
1838 | if (!newprop->name) |
1839 | return -EINVAL; | |
1cf3d8b3 | 1840 | |
8a2b22a2 | 1841 | mutex_lock(&of_mutex); |
fcdeb7fe | 1842 | |
d6d3c4e6 | 1843 | raw_spin_lock_irqsave(&devtree_lock, flags); |
d8c50088 | 1844 | rc = __of_update_property(np, newprop, &oldprop); |
d6d3c4e6 | 1845 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
fcdeb7fe | 1846 | |
8a2b22a2 GL |
1847 | if (!rc) |
1848 | __of_update_property_sysfs(np, newprop, oldprop); | |
fcdeb7fe | 1849 | |
8a2b22a2 | 1850 | mutex_unlock(&of_mutex); |
fcdeb7fe | 1851 | |
259092a3 GL |
1852 | if (!rc) |
1853 | of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop, oldprop); | |
e81b3295 | 1854 | |
1cf3d8b3 | 1855 | return rc; |
fcdeb7fe | 1856 | } |
fcdeb7fe | 1857 | |
611cad72 SG |
1858 | static void of_alias_add(struct alias_prop *ap, struct device_node *np, |
1859 | int id, const char *stem, int stem_len) | |
1860 | { | |
1861 | ap->np = np; | |
1862 | ap->id = id; | |
1863 | strncpy(ap->stem, stem, stem_len); | |
1864 | ap->stem[stem_len] = 0; | |
1865 | list_add_tail(&ap->link, &aliases_lookup); | |
1866 | pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n", | |
74a7f084 | 1867 | ap->alias, ap->stem, ap->id, of_node_full_name(np)); |
611cad72 SG |
1868 | } |
1869 | ||
1870 | /** | |
1821dda4 | 1871 | * of_alias_scan - Scan all properties of the 'aliases' node |
611cad72 | 1872 | * |
1821dda4 GU |
1873 | * The function scans all the properties of the 'aliases' node and populates |
1874 | * the global lookup table with the properties. It returns the | |
1875 | * number of alias properties found, or an error code in case of failure. | |
611cad72 SG |
1876 | * |
1877 | * @dt_alloc: An allocator that provides a virtual address to memory | |
1821dda4 | 1878 | * for storing the resulting tree |
611cad72 SG |
1879 | */ |
1880 | void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)) | |
1881 | { | |
1882 | struct property *pp; | |
1883 | ||
7dbe5849 | 1884 | of_aliases = of_find_node_by_path("/aliases"); |
611cad72 SG |
1885 | of_chosen = of_find_node_by_path("/chosen"); |
1886 | if (of_chosen == NULL) | |
1887 | of_chosen = of_find_node_by_path("/chosen@0"); | |
5c19e952 SH |
1888 | |
1889 | if (of_chosen) { | |
a752ee56 | 1890 | /* linux,stdout-path and /aliases/stdout are for legacy compatibility */ |
676e1b2f GL |
1891 | const char *name = of_get_property(of_chosen, "stdout-path", NULL); |
1892 | if (!name) | |
1893 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); | |
a752ee56 GL |
1894 | if (IS_ENABLED(CONFIG_PPC) && !name) |
1895 | name = of_get_property(of_aliases, "stdout", NULL); | |
2fa645cb | 1896 | if (name) { |
7914a7c5 | 1897 | of_stdout = of_find_node_opts_by_path(name, &of_stdout_options); |
2fa645cb PH |
1898 | add_preferred_console("stdout-path", 0, NULL); |
1899 | } | |
5c19e952 SH |
1900 | } |
1901 | ||
611cad72 SG |
1902 | if (!of_aliases) |
1903 | return; | |
1904 | ||
8af0da93 | 1905 | for_each_property_of_node(of_aliases, pp) { |
611cad72 SG |
1906 | const char *start = pp->name; |
1907 | const char *end = start + strlen(start); | |
1908 | struct device_node *np; | |
1909 | struct alias_prop *ap; | |
1910 | int id, len; | |
1911 | ||
1912 | /* Skip those we do not want to proceed */ | |
1913 | if (!strcmp(pp->name, "name") || | |
1914 | !strcmp(pp->name, "phandle") || | |
1915 | !strcmp(pp->name, "linux,phandle")) | |
1916 | continue; | |
1917 | ||
1918 | np = of_find_node_by_path(pp->value); | |
1919 | if (!np) | |
1920 | continue; | |
1921 | ||
1922 | /* walk the alias backwards to extract the id and work out | |
1923 | * the 'stem' string */ | |
1924 | while (isdigit(*(end-1)) && end > start) | |
1925 | end--; | |
1926 | len = end - start; | |
1927 | ||
1928 | if (kstrtoint(end, 10, &id) < 0) | |
1929 | continue; | |
1930 | ||
1931 | /* Allocate an alias_prop with enough space for the stem */ | |
1932 | ap = dt_alloc(sizeof(*ap) + len + 1, 4); | |
1933 | if (!ap) | |
1934 | continue; | |
0640332e | 1935 | memset(ap, 0, sizeof(*ap) + len + 1); |
611cad72 SG |
1936 | ap->alias = start; |
1937 | of_alias_add(ap, np, id, start, len); | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | /** | |
1942 | * of_alias_get_id - Get alias id for the given device_node | |
1943 | * @np: Pointer to the given device_node | |
1944 | * @stem: Alias stem of the given device_node | |
1945 | * | |
5a53a07f GU |
1946 | * The function travels the lookup table to get the alias id for the given |
1947 | * device_node and alias stem. It returns the alias id if found. | |
611cad72 SG |
1948 | */ |
1949 | int of_alias_get_id(struct device_node *np, const char *stem) | |
1950 | { | |
1951 | struct alias_prop *app; | |
1952 | int id = -ENODEV; | |
1953 | ||
c05aba2b | 1954 | mutex_lock(&of_mutex); |
611cad72 SG |
1955 | list_for_each_entry(app, &aliases_lookup, link) { |
1956 | if (strcmp(app->stem, stem) != 0) | |
1957 | continue; | |
1958 | ||
1959 | if (np == app->np) { | |
1960 | id = app->id; | |
1961 | break; | |
1962 | } | |
1963 | } | |
c05aba2b | 1964 | mutex_unlock(&of_mutex); |
611cad72 SG |
1965 | |
1966 | return id; | |
1967 | } | |
1968 | EXPORT_SYMBOL_GPL(of_alias_get_id); | |
c541adc6 SW |
1969 | |
1970 | const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, | |
1971 | u32 *pu) | |
1972 | { | |
1973 | const void *curv = cur; | |
1974 | ||
1975 | if (!prop) | |
1976 | return NULL; | |
1977 | ||
1978 | if (!cur) { | |
1979 | curv = prop->value; | |
1980 | goto out_val; | |
1981 | } | |
1982 | ||
1983 | curv += sizeof(*cur); | |
1984 | if (curv >= prop->value + prop->length) | |
1985 | return NULL; | |
1986 | ||
1987 | out_val: | |
1988 | *pu = be32_to_cpup(curv); | |
1989 | return curv; | |
1990 | } | |
1991 | EXPORT_SYMBOL_GPL(of_prop_next_u32); | |
1992 | ||
1993 | const char *of_prop_next_string(struct property *prop, const char *cur) | |
1994 | { | |
1995 | const void *curv = cur; | |
1996 | ||
1997 | if (!prop) | |
1998 | return NULL; | |
1999 | ||
2000 | if (!cur) | |
2001 | return prop->value; | |
2002 | ||
2003 | curv += strlen(cur) + 1; | |
2004 | if (curv >= prop->value + prop->length) | |
2005 | return NULL; | |
2006 | ||
2007 | return curv; | |
2008 | } | |
2009 | EXPORT_SYMBOL_GPL(of_prop_next_string); | |
5c19e952 SH |
2010 | |
2011 | /** | |
3482f2c5 GL |
2012 | * of_console_check() - Test and setup console for DT setup |
2013 | * @dn - Pointer to device node | |
2014 | * @name - Name to use for preferred console without index. ex. "ttyS" | |
2015 | * @index - Index to use for preferred console. | |
2016 | * | |
2017 | * Check if the given device node matches the stdout-path property in the | |
2018 | * /chosen node. If it does then register it as the preferred console and return | |
2019 | * TRUE. Otherwise return FALSE. | |
5c19e952 | 2020 | */ |
3482f2c5 | 2021 | bool of_console_check(struct device_node *dn, char *name, int index) |
5c19e952 | 2022 | { |
3482f2c5 | 2023 | if (!dn || dn != of_stdout || console_set_on_cmdline) |
5c19e952 | 2024 | return false; |
7914a7c5 LL |
2025 | return !add_preferred_console(name, index, |
2026 | kstrdup(of_stdout_options, GFP_KERNEL)); | |
5c19e952 | 2027 | } |
3482f2c5 | 2028 | EXPORT_SYMBOL_GPL(of_console_check); |
a3e31b45 SK |
2029 | |
2030 | /** | |
2031 | * of_find_next_cache_node - Find a node's subsidiary cache | |
2032 | * @np: node of type "cpu" or "cache" | |
2033 | * | |
2034 | * Returns a node pointer with refcount incremented, use | |
2035 | * of_node_put() on it when done. Caller should hold a reference | |
2036 | * to np. | |
2037 | */ | |
2038 | struct device_node *of_find_next_cache_node(const struct device_node *np) | |
2039 | { | |
2040 | struct device_node *child; | |
2041 | const phandle *handle; | |
2042 | ||
2043 | handle = of_get_property(np, "l2-cache", NULL); | |
2044 | if (!handle) | |
2045 | handle = of_get_property(np, "next-level-cache", NULL); | |
2046 | ||
2047 | if (handle) | |
2048 | return of_find_node_by_phandle(be32_to_cpup(handle)); | |
2049 | ||
2050 | /* OF on pmac has nodes instead of properties named "l2-cache" | |
2051 | * beneath CPU nodes. | |
2052 | */ | |
2053 | if (!strcmp(np->type, "cpu")) | |
2054 | for_each_child_of_node(np, child) | |
2055 | if (!strcmp(child->type, "cache")) | |
2056 | return child; | |
2057 | ||
2058 | return NULL; | |
2059 | } | |
fd9fdb78 | 2060 | |
f2a575f6 PZ |
2061 | /** |
2062 | * of_graph_parse_endpoint() - parse common endpoint node properties | |
2063 | * @node: pointer to endpoint device_node | |
2064 | * @endpoint: pointer to the OF endpoint data structure | |
2065 | * | |
2066 | * The caller should hold a reference to @node. | |
2067 | */ | |
2068 | int of_graph_parse_endpoint(const struct device_node *node, | |
2069 | struct of_endpoint *endpoint) | |
2070 | { | |
2071 | struct device_node *port_node = of_get_parent(node); | |
2072 | ||
d484700a PZ |
2073 | WARN_ONCE(!port_node, "%s(): endpoint %s has no parent node\n", |
2074 | __func__, node->full_name); | |
2075 | ||
f2a575f6 PZ |
2076 | memset(endpoint, 0, sizeof(*endpoint)); |
2077 | ||
2078 | endpoint->local_node = node; | |
2079 | /* | |
2080 | * It doesn't matter whether the two calls below succeed. | |
2081 | * If they don't then the default value 0 is used. | |
2082 | */ | |
2083 | of_property_read_u32(port_node, "reg", &endpoint->port); | |
2084 | of_property_read_u32(node, "reg", &endpoint->id); | |
2085 | ||
2086 | of_node_put(port_node); | |
2087 | ||
2088 | return 0; | |
2089 | } | |
2090 | EXPORT_SYMBOL(of_graph_parse_endpoint); | |
2091 | ||
fd9fdb78 PZ |
2092 | /** |
2093 | * of_graph_get_next_endpoint() - get next endpoint node | |
2094 | * @parent: pointer to the parent device node | |
2095 | * @prev: previous endpoint node, or NULL to get first | |
2096 | * | |
2097 | * Return: An 'endpoint' node pointer with refcount incremented. Refcount | |
2098 | * of the passed @prev node is not decremented, the caller have to use | |
2099 | * of_node_put() on it when done. | |
2100 | */ | |
2101 | struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, | |
2102 | struct device_node *prev) | |
2103 | { | |
2104 | struct device_node *endpoint; | |
3c83e61e | 2105 | struct device_node *port; |
fd9fdb78 PZ |
2106 | |
2107 | if (!parent) | |
2108 | return NULL; | |
2109 | ||
3c83e61e LT |
2110 | /* |
2111 | * Start by locating the port node. If no previous endpoint is specified | |
2112 | * search for the first port node, otherwise get the previous endpoint | |
2113 | * parent port node. | |
2114 | */ | |
fd9fdb78 PZ |
2115 | if (!prev) { |
2116 | struct device_node *node; | |
3c83e61e | 2117 | |
fd9fdb78 PZ |
2118 | node = of_get_child_by_name(parent, "ports"); |
2119 | if (node) | |
2120 | parent = node; | |
2121 | ||
2122 | port = of_get_child_by_name(parent, "port"); | |
fd9fdb78 | 2123 | of_node_put(node); |
fd9fdb78 | 2124 | |
3c83e61e LT |
2125 | if (!port) { |
2126 | pr_err("%s(): no port node found in %s\n", | |
2127 | __func__, parent->full_name); | |
2128 | return NULL; | |
2129 | } | |
2130 | } else { | |
2131 | port = of_get_parent(prev); | |
2132 | if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n", | |
2133 | __func__, prev->full_name)) | |
2134 | return NULL; | |
fd9fdb78 | 2135 | |
3c83e61e LT |
2136 | /* |
2137 | * Avoid dropping prev node refcount to 0 when getting the next | |
2138 | * child below. | |
2139 | */ | |
2140 | of_node_get(prev); | |
fd9fdb78 PZ |
2141 | } |
2142 | ||
3c83e61e LT |
2143 | while (1) { |
2144 | /* | |
2145 | * Now that we have a port node, get the next endpoint by | |
2146 | * getting the next child. If the previous endpoint is NULL this | |
2147 | * will return the first child. | |
2148 | */ | |
2149 | endpoint = of_get_next_child(port, prev); | |
2150 | if (endpoint) { | |
2151 | of_node_put(port); | |
2152 | return endpoint; | |
2153 | } | |
4329b93b | 2154 | |
3c83e61e LT |
2155 | /* No more endpoints under this port, try the next one. */ |
2156 | prev = NULL; | |
4329b93b | 2157 | |
3c83e61e LT |
2158 | do { |
2159 | port = of_get_next_child(parent, port); | |
2160 | if (!port) | |
2161 | return NULL; | |
2162 | } while (of_node_cmp(port->name, "port")); | |
2163 | } | |
fd9fdb78 PZ |
2164 | } |
2165 | EXPORT_SYMBOL(of_graph_get_next_endpoint); | |
2166 | ||
2167 | /** | |
2168 | * of_graph_get_remote_port_parent() - get remote port's parent node | |
2169 | * @node: pointer to a local endpoint device_node | |
2170 | * | |
2171 | * Return: Remote device node associated with remote endpoint node linked | |
2172 | * to @node. Use of_node_put() on it when done. | |
2173 | */ | |
2174 | struct device_node *of_graph_get_remote_port_parent( | |
2175 | const struct device_node *node) | |
2176 | { | |
2177 | struct device_node *np; | |
2178 | unsigned int depth; | |
2179 | ||
2180 | /* Get remote endpoint node. */ | |
2181 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
2182 | ||
2183 | /* Walk 3 levels up only if there is 'ports' node. */ | |
2184 | for (depth = 3; depth && np; depth--) { | |
2185 | np = of_get_next_parent(np); | |
2186 | if (depth == 2 && of_node_cmp(np->name, "ports")) | |
2187 | break; | |
2188 | } | |
2189 | return np; | |
2190 | } | |
2191 | EXPORT_SYMBOL(of_graph_get_remote_port_parent); | |
2192 | ||
2193 | /** | |
2194 | * of_graph_get_remote_port() - get remote port node | |
2195 | * @node: pointer to a local endpoint device_node | |
2196 | * | |
2197 | * Return: Remote port node associated with remote endpoint node linked | |
2198 | * to @node. Use of_node_put() on it when done. | |
2199 | */ | |
2200 | struct device_node *of_graph_get_remote_port(const struct device_node *node) | |
2201 | { | |
2202 | struct device_node *np; | |
2203 | ||
2204 | /* Get remote endpoint node. */ | |
2205 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
2206 | if (!np) | |
2207 | return NULL; | |
2208 | return of_get_next_parent(np); | |
2209 | } | |
2210 | EXPORT_SYMBOL(of_graph_get_remote_port); |