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3f23de10 SR |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4 | * and Arnd Bergmann, IBM Corp. | |
5 | * Merged from powerpc/kernel/of_platform.c and | |
6 | * sparc{,64}/kernel/of_device.c by Stephen Rothwell | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | #include <linux/errno.h> | |
5c457083 | 15 | #include <linux/module.h> |
5de1540b | 16 | #include <linux/amba/bus.h> |
3f23de10 | 17 | #include <linux/device.h> |
5fd200f3 | 18 | #include <linux/dma-mapping.h> |
50ef5284 | 19 | #include <linux/slab.h> |
9e3288dc | 20 | #include <linux/of_address.h> |
3f23de10 | 21 | #include <linux/of_device.h> |
9e3288dc | 22 | #include <linux/of_irq.h> |
3f23de10 | 23 | #include <linux/of_platform.h> |
eca39301 GL |
24 | #include <linux/platform_device.h> |
25 | ||
cbb49c26 GL |
26 | const struct of_device_id of_default_bus_match_table[] = { |
27 | { .compatible = "simple-bus", }, | |
28 | #ifdef CONFIG_ARM_AMBA | |
29 | { .compatible = "arm,amba-bus", }, | |
30 | #endif /* CONFIG_ARM_AMBA */ | |
31 | {} /* Empty terminated list */ | |
32 | }; | |
33 | ||
c6085584 JB |
34 | static int of_dev_node_match(struct device *dev, void *data) |
35 | { | |
36 | return dev->of_node == data; | |
37 | } | |
38 | ||
39 | /** | |
40 | * of_find_device_by_node - Find the platform_device associated with a node | |
41 | * @np: Pointer to device tree node | |
42 | * | |
43 | * Returns platform_device pointer, or NULL if not found | |
44 | */ | |
45 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
46 | { | |
47 | struct device *dev; | |
48 | ||
49 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
50 | return dev ? to_platform_device(dev) : NULL; | |
51 | } | |
52 | EXPORT_SYMBOL(of_find_device_by_node); | |
53 | ||
964dba28 | 54 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
55 | /* |
56 | * The following routines scan a subtree and registers a device for | |
57 | * each applicable node. | |
58 | * | |
59 | * Note: sparc doesn't use these routines because it has a different | |
60 | * mechanism for creating devices from device tree nodes. | |
61 | */ | |
62 | ||
94c09319 GL |
63 | /** |
64 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
65 | * @dev: pointer to device structure that is linked to a device tree node | |
66 | * | |
07e461cd GL |
67 | * This routine will first try using the translated bus address to |
68 | * derive a unique name. If it cannot, then it will prepend names from | |
69 | * parent nodes until a unique name can be derived. | |
94c09319 | 70 | */ |
c6601225 | 71 | void of_device_make_bus_id(struct device *dev) |
94c09319 | 72 | { |
94c09319 | 73 | struct device_node *node = dev->of_node; |
24fb530f | 74 | const __be32 *reg; |
94c09319 | 75 | u64 addr; |
94c09319 | 76 | |
07e461cd GL |
77 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
78 | while (node->parent) { | |
79 | /* | |
80 | * If the address can be translated, then that is as much | |
81 | * uniqueness as we need. Make it the first component and return | |
82 | */ | |
83 | reg = of_get_property(node, "reg", NULL); | |
84 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { | |
85 | dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", | |
86 | (unsigned long long)addr, node->name, | |
87 | dev_name(dev)); | |
94c09319 GL |
88 | return; |
89 | } | |
94c09319 | 90 | |
07e461cd GL |
91 | /* format arguments only used if dev_name() resolves to NULL */ |
92 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", | |
93 | strrchr(node->full_name, '/') + 1, dev_name(dev)); | |
94 | node = node->parent; | |
95 | } | |
94c09319 GL |
96 | } |
97 | ||
98 | /** | |
99 | * of_device_alloc - Allocate and initialize an of_device | |
100 | * @np: device node to assign to device | |
101 | * @bus_id: Name to assign to the device. May be null to use default name. | |
102 | * @parent: Parent device. | |
103 | */ | |
94a0cb1f | 104 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
105 | const char *bus_id, |
106 | struct device *parent) | |
107 | { | |
94a0cb1f | 108 | struct platform_device *dev; |
52f6537c | 109 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
110 | struct resource *res, temp_res; |
111 | ||
7096d042 GL |
112 | dev = platform_device_alloc("", -1); |
113 | if (!dev) | |
114 | return NULL; | |
115 | ||
116 | /* count the io and irq resources */ | |
d9c6866b RH |
117 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
118 | num_reg++; | |
52f6537c | 119 | num_irq = of_irq_count(np); |
ac80a51e | 120 | |
ac80a51e GL |
121 | /* Populate the resource table */ |
122 | if (num_irq || num_reg) { | |
7096d042 GL |
123 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
124 | if (!res) { | |
125 | platform_device_put(dev); | |
126 | return NULL; | |
127 | } | |
128 | ||
ac80a51e GL |
129 | dev->num_resources = num_reg + num_irq; |
130 | dev->resource = res; | |
131 | for (i = 0; i < num_reg; i++, res++) { | |
132 | rc = of_address_to_resource(np, i, res); | |
133 | WARN_ON(rc); | |
134 | } | |
9ec36caf RH |
135 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
136 | pr_debug("not all legacy IRQ resources mapped for %s\n", | |
137 | np->name); | |
ac80a51e | 138 | } |
94c09319 GL |
139 | |
140 | dev->dev.of_node = of_node_get(np); | |
43c0767e | 141 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
142 | |
143 | if (bus_id) | |
144 | dev_set_name(&dev->dev, "%s", bus_id); | |
145 | else | |
146 | of_device_make_bus_id(&dev->dev); | |
147 | ||
148 | return dev; | |
149 | } | |
150 | EXPORT_SYMBOL(of_device_alloc); | |
151 | ||
97890ba9 WD |
152 | static void of_dma_deconfigure(struct device *dev) |
153 | { | |
154 | arch_teardown_dma_ops(dev); | |
591c1ee4 SS |
155 | } |
156 | ||
5fd200f3 | 157 | /** |
15c3597d | 158 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
159 | * @np: pointer to node to create device for |
160 | * @bus_id: name to assign device | |
15c3597d | 161 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 162 | * @parent: Linux device model parent device. |
cd1e6504 GL |
163 | * |
164 | * Returns pointer to created platform device, or NULL if a device was not | |
165 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 166 | */ |
245d9641 | 167 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
168 | struct device_node *np, |
169 | const char *bus_id, | |
170 | void *platform_data, | |
171 | struct device *parent) | |
5fd200f3 | 172 | { |
94a0cb1f | 173 | struct platform_device *dev; |
5fd200f3 | 174 | |
c6e126de PM |
175 | if (!of_device_is_available(np) || |
176 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
177 | return NULL; |
178 | ||
5fd200f3 GL |
179 | dev = of_device_alloc(np, bus_id, parent); |
180 | if (!dev) | |
c6e126de | 181 | goto err_clear_flag; |
5fd200f3 | 182 | |
eca39301 | 183 | dev->dev.bus = &platform_bus_type; |
15c3597d | 184 | dev->dev.platform_data = platform_data; |
1f5c69aa | 185 | of_dma_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 186 | |
7096d042 | 187 | if (of_device_add(dev) != 0) { |
97890ba9 | 188 | of_dma_deconfigure(&dev->dev); |
7096d042 | 189 | platform_device_put(dev); |
c6e126de | 190 | goto err_clear_flag; |
5fd200f3 GL |
191 | } |
192 | ||
193 | return dev; | |
c6e126de PM |
194 | |
195 | err_clear_flag: | |
196 | of_node_clear_flag(np, OF_POPULATED); | |
197 | return NULL; | |
5fd200f3 | 198 | } |
15c3597d GL |
199 | |
200 | /** | |
201 | * of_platform_device_create - Alloc, initialize and register an of_device | |
202 | * @np: pointer to node to create device for | |
203 | * @bus_id: name to assign device | |
204 | * @parent: Linux device model parent device. | |
205 | * | |
206 | * Returns pointer to created platform device, or NULL if a device was not | |
207 | * registered. Unavailable devices will not get registered. | |
208 | */ | |
209 | struct platform_device *of_platform_device_create(struct device_node *np, | |
210 | const char *bus_id, | |
211 | struct device *parent) | |
212 | { | |
213 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
214 | } | |
5fd200f3 GL |
215 | EXPORT_SYMBOL(of_platform_device_create); |
216 | ||
5de1540b GL |
217 | #ifdef CONFIG_ARM_AMBA |
218 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
219 | const char *bus_id, | |
220 | void *platform_data, | |
221 | struct device *parent) | |
222 | { | |
223 | struct amba_device *dev; | |
224 | const void *prop; | |
225 | int i, ret; | |
226 | ||
227 | pr_debug("Creating amba device %s\n", node->full_name); | |
228 | ||
c6e126de PM |
229 | if (!of_device_is_available(node) || |
230 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
231 | return NULL; |
232 | ||
c0f72f8a | 233 | dev = amba_device_alloc(NULL, 0, 0); |
2bc552df BZ |
234 | if (!dev) { |
235 | pr_err("%s(): amba_device_alloc() failed for %s\n", | |
236 | __func__, node->full_name); | |
c6e126de | 237 | goto err_clear_flag; |
2bc552df | 238 | } |
5de1540b GL |
239 | |
240 | /* setup generic device info */ | |
5de1540b | 241 | dev->dev.of_node = of_node_get(node); |
43c0767e | 242 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
243 | dev->dev.platform_data = platform_data; |
244 | if (bus_id) | |
245 | dev_set_name(&dev->dev, "%s", bus_id); | |
246 | else | |
247 | of_device_make_bus_id(&dev->dev); | |
1f5c69aa | 248 | of_dma_configure(&dev->dev, dev->dev.of_node); |
5de1540b | 249 | |
5de1540b GL |
250 | /* Allow the HW Peripheral ID to be overridden */ |
251 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
252 | if (prop) | |
253 | dev->periphid = of_read_ulong(prop, 1); | |
254 | ||
255 | /* Decode the IRQs and address ranges */ | |
256 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
257 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
258 | ||
259 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df BZ |
260 | if (ret) { |
261 | pr_err("%s(): of_address_to_resource() failed (%d) for %s\n", | |
262 | __func__, ret, node->full_name); | |
5de1540b | 263 | goto err_free; |
2bc552df | 264 | } |
5de1540b | 265 | |
c0f72f8a | 266 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df BZ |
267 | if (ret) { |
268 | pr_err("%s(): amba_device_add() failed (%d) for %s\n", | |
269 | __func__, ret, node->full_name); | |
5de1540b | 270 | goto err_free; |
2bc552df | 271 | } |
5de1540b GL |
272 | |
273 | return dev; | |
274 | ||
275 | err_free: | |
c0f72f8a | 276 | amba_device_put(dev); |
c6e126de PM |
277 | err_clear_flag: |
278 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
279 | return NULL; |
280 | } | |
281 | #else /* CONFIG_ARM_AMBA */ | |
282 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
283 | const char *bus_id, | |
284 | void *platform_data, | |
285 | struct device *parent) | |
286 | { | |
287 | return NULL; | |
288 | } | |
289 | #endif /* CONFIG_ARM_AMBA */ | |
290 | ||
15c3597d GL |
291 | /** |
292 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
293 | */ | |
294 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
295 | struct device_node *np) | |
296 | { | |
297 | struct resource res; | |
303f59d1 OJ |
298 | |
299 | if (!lookup) | |
300 | return NULL; | |
301 | ||
f88e1ae8 | 302 | for(; lookup->compatible != NULL; lookup++) { |
303f59d1 OJ |
303 | if (!of_device_is_compatible(np, lookup->compatible)) |
304 | continue; | |
84774e61 LJ |
305 | if (!of_address_to_resource(np, 0, &res)) |
306 | if (res.start != lookup->phys_addr) | |
307 | continue; | |
303f59d1 OJ |
308 | pr_debug("%s: devname=%s\n", np->full_name, lookup->name); |
309 | return lookup; | |
15c3597d | 310 | } |
303f59d1 | 311 | |
15c3597d GL |
312 | return NULL; |
313 | } | |
314 | ||
5fd200f3 | 315 | /** |
38e9e21d | 316 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 317 | * @bus: device node of the bus to instantiate |
1eed4c07 | 318 | * @matches: match table for bus nodes |
303f59d1 | 319 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 320 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 321 | * @strict: require compatible property |
38e9e21d GL |
322 | * |
323 | * Creates a platform_device for the provided device_node, and optionally | |
324 | * recursively create devices for all the child nodes. | |
5fd200f3 | 325 | */ |
38e9e21d | 326 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 327 | const struct of_device_id *matches, |
15c3597d | 328 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 329 | struct device *parent, bool strict) |
5fd200f3 | 330 | { |
15c3597d | 331 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 332 | struct device_node *child; |
94a0cb1f | 333 | struct platform_device *dev; |
15c3597d GL |
334 | const char *bus_id = NULL; |
335 | void *platform_data = NULL; | |
5fd200f3 GL |
336 | int rc = 0; |
337 | ||
29d4f8a4 GL |
338 | /* Make sure it has a compatible property */ |
339 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
340 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
341 | __func__, bus->full_name); | |
342 | return 0; | |
343 | } | |
344 | ||
15c3597d GL |
345 | auxdata = of_dev_lookup(lookup, bus); |
346 | if (auxdata) { | |
347 | bus_id = auxdata->name; | |
348 | platform_data = auxdata->platform_data; | |
349 | } | |
350 | ||
5de1540b | 351 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
352 | /* |
353 | * Don't return an error here to keep compatibility with older | |
354 | * device tree files. | |
355 | */ | |
15c3597d | 356 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
357 | return 0; |
358 | } | |
359 | ||
15c3597d | 360 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
361 | if (!dev || !of_match_node(matches, bus)) |
362 | return 0; | |
363 | ||
5fd200f3 GL |
364 | for_each_child_of_node(bus, child) { |
365 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 366 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
367 | if (rc) { |
368 | of_node_put(child); | |
369 | break; | |
370 | } | |
371 | } | |
75f353b6 | 372 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
373 | return rc; |
374 | } | |
375 | ||
376 | /** | |
38e9e21d | 377 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 378 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 379 | * @matches: match table for bus nodes |
5fd200f3 GL |
380 | * @parent: parent to hook devices from, NULL for toplevel |
381 | * | |
382 | * Note that children of the provided root are not instantiated as devices | |
383 | * unless the specified root itself matches the bus list and is not NULL. | |
384 | */ | |
385 | int of_platform_bus_probe(struct device_node *root, | |
386 | const struct of_device_id *matches, | |
387 | struct device *parent) | |
388 | { | |
389 | struct device_node *child; | |
5fd200f3 GL |
390 | int rc = 0; |
391 | ||
1eed4c07 GL |
392 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
393 | if (!root) | |
60d59913 | 394 | return -EINVAL; |
5fd200f3 GL |
395 | |
396 | pr_debug("of_platform_bus_probe()\n"); | |
397 | pr_debug(" starting at: %s\n", root->full_name); | |
398 | ||
1eed4c07 | 399 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 400 | if (of_match_node(matches, root)) { |
15c3597d | 401 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 402 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
403 | if (!of_match_node(matches, child)) |
404 | continue; | |
15c3597d | 405 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
38e9e21d | 406 | if (rc) |
5fd200f3 | 407 | break; |
5fd200f3 | 408 | } |
38e9e21d | 409 | |
5fd200f3 GL |
410 | of_node_put(root); |
411 | return rc; | |
412 | } | |
413 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
414 | |
415 | /** | |
416 | * of_platform_populate() - Populate platform_devices from device tree data | |
417 | * @root: parent of the first level to probe or NULL for the root of the tree | |
418 | * @matches: match table, NULL to use the default | |
92039ed1 | 419 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
420 | * @parent: parent to hook devices from, NULL for toplevel |
421 | * | |
422 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
423 | * and creates devices from nodes. It differs in that it follows the modern | |
424 | * convention of requiring all device nodes to have a 'compatible' property, | |
425 | * and it is suitable for creating devices which are children of the root | |
426 | * node (of_platform_bus_probe will only create children of the root which | |
427 | * are selected by the @matches argument). | |
428 | * | |
429 | * New board support should be using this function instead of | |
430 | * of_platform_bus_probe(). | |
431 | * | |
432 | * Returns 0 on success, < 0 on failure. | |
433 | */ | |
434 | int of_platform_populate(struct device_node *root, | |
435 | const struct of_device_id *matches, | |
15c3597d | 436 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
437 | struct device *parent) |
438 | { | |
439 | struct device_node *child; | |
440 | int rc = 0; | |
441 | ||
442 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
443 | if (!root) | |
444 | return -EINVAL; | |
445 | ||
446 | for_each_child_of_node(root, child) { | |
15c3597d | 447 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
29d4f8a4 GL |
448 | if (rc) |
449 | break; | |
450 | } | |
2d0747c4 | 451 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
452 | |
453 | of_node_put(root); | |
454 | return rc; | |
455 | } | |
e001f1c8 | 456 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de PM |
457 | |
458 | static int of_platform_device_destroy(struct device *dev, void *data) | |
459 | { | |
c6e126de | 460 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 461 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 462 | return 0; |
c6e126de | 463 | |
75f353b6 GL |
464 | /* Recurse for any nodes that were treated as busses */ |
465 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
466 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de PM |
467 | |
468 | if (dev->bus == &platform_bus_type) | |
469 | platform_device_unregister(to_platform_device(dev)); | |
470 | #ifdef CONFIG_ARM_AMBA | |
471 | else if (dev->bus == &amba_bustype) | |
472 | amba_device_unregister(to_amba_device(dev)); | |
473 | #endif | |
c6e126de | 474 | |
0495cb75 | 475 | of_dma_deconfigure(dev); |
c6e126de | 476 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
75f353b6 | 477 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
c6e126de PM |
478 | return 0; |
479 | } | |
480 | ||
481 | /** | |
482 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 483 | * @parent: device which children will be removed |
c6e126de PM |
484 | * |
485 | * Complementary to of_platform_populate(), this function removes children | |
486 | * of the given device (and, recurrently, their children) that have been | |
487 | * created from their respective device tree nodes (and only those, | |
488 | * leaving others - eg. manually created - unharmed). | |
489 | * | |
490 | * Returns 0 when all children devices have been removed or | |
491 | * -EBUSY when some children remained. | |
492 | */ | |
75f353b6 | 493 | void of_platform_depopulate(struct device *parent) |
c6e126de | 494 | { |
2d0747c4 GL |
495 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
496 | device_for_each_child(parent, NULL, of_platform_device_destroy); | |
497 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); | |
498 | } | |
c6e126de PM |
499 | } |
500 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
501 | ||
801d728c PA |
502 | #ifdef CONFIG_OF_DYNAMIC |
503 | static int of_platform_notify(struct notifier_block *nb, | |
504 | unsigned long action, void *arg) | |
505 | { | |
506 | struct of_reconfig_data *rd = arg; | |
507 | struct platform_device *pdev_parent, *pdev; | |
508 | bool children_left; | |
509 | ||
510 | switch (of_reconfig_get_state_change(action, rd)) { | |
511 | case OF_RECONFIG_CHANGE_ADD: | |
512 | /* verify that the parent is a bus */ | |
513 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
514 | return NOTIFY_OK; /* not for us */ | |
515 | ||
15204ab1 PA |
516 | /* already populated? (driver using of_populate manually) */ |
517 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
518 | return NOTIFY_OK; | |
519 | ||
801d728c PA |
520 | /* pdev_parent may be NULL when no bus platform device */ |
521 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
522 | pdev = of_platform_device_create(rd->dn, NULL, | |
523 | pdev_parent ? &pdev_parent->dev : NULL); | |
524 | of_dev_put(pdev_parent); | |
525 | ||
526 | if (pdev == NULL) { | |
527 | pr_err("%s: failed to create for '%s'\n", | |
528 | __func__, rd->dn->full_name); | |
529 | /* of_platform_device_create tosses the error code */ | |
530 | return notifier_from_errno(-EINVAL); | |
531 | } | |
532 | break; | |
533 | ||
534 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
535 | |
536 | /* already depopulated? */ | |
537 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
538 | return NOTIFY_OK; | |
539 | ||
801d728c PA |
540 | /* find our device by node */ |
541 | pdev = of_find_device_by_node(rd->dn); | |
542 | if (pdev == NULL) | |
543 | return NOTIFY_OK; /* no? not meant for us */ | |
544 | ||
545 | /* unregister takes one ref away */ | |
546 | of_platform_device_destroy(&pdev->dev, &children_left); | |
547 | ||
548 | /* and put the reference of the find */ | |
549 | of_dev_put(pdev); | |
550 | break; | |
551 | } | |
552 | ||
553 | return NOTIFY_OK; | |
554 | } | |
555 | ||
556 | static struct notifier_block platform_of_notifier = { | |
557 | .notifier_call = of_platform_notify, | |
558 | }; | |
559 | ||
560 | void of_platform_register_reconfig_notifier(void) | |
561 | { | |
562 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
563 | } | |
564 | #endif /* CONFIG_OF_DYNAMIC */ | |
565 | ||
964dba28 | 566 | #endif /* CONFIG_OF_ADDRESS */ |