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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); | |
94c09319 | 141 | dev->dev.parent = parent; |
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 | ||
591c1ee4 SS |
152 | /** |
153 | * of_dma_configure - Setup DMA configuration | |
154 | * @dev: Device to apply DMA configuration | |
155 | * | |
156 | * Try to get devices's DMA configuration from DT and update it | |
157 | * accordingly. | |
158 | * | |
159 | * In case if platform code need to use own special DMA configuration,it | |
160 | * can use Platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE event | |
161 | * to fix up DMA configuration. | |
162 | */ | |
163 | static void of_dma_configure(struct platform_device *pdev) | |
164 | { | |
165 | u64 dma_addr, paddr, size; | |
166 | int ret; | |
167 | struct device *dev = &pdev->dev; | |
168 | ||
591c1ee4 SS |
169 | /* |
170 | * Set default dma-mask to 32 bit. Drivers are expected to setup | |
171 | * the correct supported dma_mask. | |
172 | */ | |
173 | dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
174 | ||
175 | /* | |
176 | * Set it to coherent_dma_mask by default if the architecture | |
177 | * code has not set it. | |
178 | */ | |
179 | if (!dev->dma_mask) | |
180 | dev->dma_mask = &dev->coherent_dma_mask; | |
181 | ||
182 | /* | |
183 | * if dma-coherent property exist, call arch hook to setup | |
184 | * dma coherent operations. | |
185 | */ | |
186 | if (of_dma_is_coherent(dev->of_node)) { | |
187 | set_arch_dma_coherent_ops(dev); | |
188 | dev_dbg(dev, "device is dma coherent\n"); | |
189 | } | |
190 | ||
191 | /* | |
192 | * if dma-ranges property doesn't exist - just return else | |
193 | * setup the dma offset | |
194 | */ | |
195 | ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size); | |
196 | if (ret < 0) { | |
197 | dev_dbg(dev, "no dma range information to setup\n"); | |
198 | return; | |
199 | } | |
200 | ||
201 | /* DMA ranges found. Calculate and set dma_pfn_offset */ | |
202 | dev->dma_pfn_offset = PFN_DOWN(paddr - dma_addr); | |
203 | dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset); | |
204 | } | |
205 | ||
5fd200f3 | 206 | /** |
15c3597d | 207 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
208 | * @np: pointer to node to create device for |
209 | * @bus_id: name to assign device | |
15c3597d | 210 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 211 | * @parent: Linux device model parent device. |
cd1e6504 GL |
212 | * |
213 | * Returns pointer to created platform device, or NULL if a device was not | |
214 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 215 | */ |
245d9641 | 216 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
217 | struct device_node *np, |
218 | const char *bus_id, | |
219 | void *platform_data, | |
220 | struct device *parent) | |
5fd200f3 | 221 | { |
94a0cb1f | 222 | struct platform_device *dev; |
5fd200f3 | 223 | |
c6e126de PM |
224 | if (!of_device_is_available(np) || |
225 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
226 | return NULL; |
227 | ||
5fd200f3 GL |
228 | dev = of_device_alloc(np, bus_id, parent); |
229 | if (!dev) | |
c6e126de | 230 | goto err_clear_flag; |
5fd200f3 | 231 | |
591c1ee4 | 232 | of_dma_configure(dev); |
eca39301 | 233 | dev->dev.bus = &platform_bus_type; |
15c3597d | 234 | dev->dev.platform_data = platform_data; |
5fd200f3 GL |
235 | |
236 | /* We do not fill the DMA ops for platform devices by default. | |
237 | * This is currently the responsibility of the platform code | |
238 | * to do such, possibly using a device notifier | |
239 | */ | |
240 | ||
7096d042 GL |
241 | if (of_device_add(dev) != 0) { |
242 | platform_device_put(dev); | |
c6e126de | 243 | goto err_clear_flag; |
5fd200f3 GL |
244 | } |
245 | ||
246 | return dev; | |
c6e126de PM |
247 | |
248 | err_clear_flag: | |
249 | of_node_clear_flag(np, OF_POPULATED); | |
250 | return NULL; | |
5fd200f3 | 251 | } |
15c3597d GL |
252 | |
253 | /** | |
254 | * of_platform_device_create - Alloc, initialize and register an of_device | |
255 | * @np: pointer to node to create device for | |
256 | * @bus_id: name to assign device | |
257 | * @parent: Linux device model parent device. | |
258 | * | |
259 | * Returns pointer to created platform device, or NULL if a device was not | |
260 | * registered. Unavailable devices will not get registered. | |
261 | */ | |
262 | struct platform_device *of_platform_device_create(struct device_node *np, | |
263 | const char *bus_id, | |
264 | struct device *parent) | |
265 | { | |
266 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
267 | } | |
5fd200f3 GL |
268 | EXPORT_SYMBOL(of_platform_device_create); |
269 | ||
5de1540b GL |
270 | #ifdef CONFIG_ARM_AMBA |
271 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
272 | const char *bus_id, | |
273 | void *platform_data, | |
274 | struct device *parent) | |
275 | { | |
276 | struct amba_device *dev; | |
277 | const void *prop; | |
278 | int i, ret; | |
279 | ||
280 | pr_debug("Creating amba device %s\n", node->full_name); | |
281 | ||
c6e126de PM |
282 | if (!of_device_is_available(node) || |
283 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
284 | return NULL; |
285 | ||
c0f72f8a | 286 | dev = amba_device_alloc(NULL, 0, 0); |
2bc552df BZ |
287 | if (!dev) { |
288 | pr_err("%s(): amba_device_alloc() failed for %s\n", | |
289 | __func__, node->full_name); | |
c6e126de | 290 | goto err_clear_flag; |
2bc552df | 291 | } |
5de1540b GL |
292 | |
293 | /* setup generic device info */ | |
294 | dev->dev.coherent_dma_mask = ~0; | |
295 | dev->dev.of_node = of_node_get(node); | |
296 | dev->dev.parent = parent; | |
297 | dev->dev.platform_data = platform_data; | |
298 | if (bus_id) | |
299 | dev_set_name(&dev->dev, "%s", bus_id); | |
300 | else | |
301 | of_device_make_bus_id(&dev->dev); | |
302 | ||
5de1540b GL |
303 | /* Allow the HW Peripheral ID to be overridden */ |
304 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
305 | if (prop) | |
306 | dev->periphid = of_read_ulong(prop, 1); | |
307 | ||
308 | /* Decode the IRQs and address ranges */ | |
309 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
310 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
311 | ||
312 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df BZ |
313 | if (ret) { |
314 | pr_err("%s(): of_address_to_resource() failed (%d) for %s\n", | |
315 | __func__, ret, node->full_name); | |
5de1540b | 316 | goto err_free; |
2bc552df | 317 | } |
5de1540b | 318 | |
c0f72f8a | 319 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df BZ |
320 | if (ret) { |
321 | pr_err("%s(): amba_device_add() failed (%d) for %s\n", | |
322 | __func__, ret, node->full_name); | |
5de1540b | 323 | goto err_free; |
2bc552df | 324 | } |
5de1540b GL |
325 | |
326 | return dev; | |
327 | ||
328 | err_free: | |
c0f72f8a | 329 | amba_device_put(dev); |
c6e126de PM |
330 | err_clear_flag: |
331 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
332 | return NULL; |
333 | } | |
334 | #else /* CONFIG_ARM_AMBA */ | |
335 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
336 | const char *bus_id, | |
337 | void *platform_data, | |
338 | struct device *parent) | |
339 | { | |
340 | return NULL; | |
341 | } | |
342 | #endif /* CONFIG_ARM_AMBA */ | |
343 | ||
15c3597d GL |
344 | /** |
345 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
346 | */ | |
347 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
348 | struct device_node *np) | |
349 | { | |
350 | struct resource res; | |
303f59d1 OJ |
351 | |
352 | if (!lookup) | |
353 | return NULL; | |
354 | ||
f88e1ae8 | 355 | for(; lookup->compatible != NULL; lookup++) { |
303f59d1 OJ |
356 | if (!of_device_is_compatible(np, lookup->compatible)) |
357 | continue; | |
84774e61 LJ |
358 | if (!of_address_to_resource(np, 0, &res)) |
359 | if (res.start != lookup->phys_addr) | |
360 | continue; | |
303f59d1 OJ |
361 | pr_debug("%s: devname=%s\n", np->full_name, lookup->name); |
362 | return lookup; | |
15c3597d | 363 | } |
303f59d1 | 364 | |
15c3597d GL |
365 | return NULL; |
366 | } | |
367 | ||
5fd200f3 | 368 | /** |
38e9e21d | 369 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 370 | * @bus: device node of the bus to instantiate |
1eed4c07 | 371 | * @matches: match table for bus nodes |
303f59d1 | 372 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 373 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 374 | * @strict: require compatible property |
38e9e21d GL |
375 | * |
376 | * Creates a platform_device for the provided device_node, and optionally | |
377 | * recursively create devices for all the child nodes. | |
5fd200f3 | 378 | */ |
38e9e21d | 379 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 380 | const struct of_device_id *matches, |
15c3597d | 381 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 382 | struct device *parent, bool strict) |
5fd200f3 | 383 | { |
15c3597d | 384 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 385 | struct device_node *child; |
94a0cb1f | 386 | struct platform_device *dev; |
15c3597d GL |
387 | const char *bus_id = NULL; |
388 | void *platform_data = NULL; | |
5fd200f3 GL |
389 | int rc = 0; |
390 | ||
29d4f8a4 GL |
391 | /* Make sure it has a compatible property */ |
392 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
393 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
394 | __func__, bus->full_name); | |
395 | return 0; | |
396 | } | |
397 | ||
15c3597d GL |
398 | auxdata = of_dev_lookup(lookup, bus); |
399 | if (auxdata) { | |
400 | bus_id = auxdata->name; | |
401 | platform_data = auxdata->platform_data; | |
402 | } | |
403 | ||
5de1540b | 404 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
405 | /* |
406 | * Don't return an error here to keep compatibility with older | |
407 | * device tree files. | |
408 | */ | |
15c3597d | 409 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
410 | return 0; |
411 | } | |
412 | ||
15c3597d | 413 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
414 | if (!dev || !of_match_node(matches, bus)) |
415 | return 0; | |
416 | ||
5fd200f3 GL |
417 | for_each_child_of_node(bus, child) { |
418 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 419 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
420 | if (rc) { |
421 | of_node_put(child); | |
422 | break; | |
423 | } | |
424 | } | |
425 | return rc; | |
426 | } | |
427 | ||
428 | /** | |
38e9e21d | 429 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 430 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 431 | * @matches: match table for bus nodes |
5fd200f3 GL |
432 | * @parent: parent to hook devices from, NULL for toplevel |
433 | * | |
434 | * Note that children of the provided root are not instantiated as devices | |
435 | * unless the specified root itself matches the bus list and is not NULL. | |
436 | */ | |
437 | int of_platform_bus_probe(struct device_node *root, | |
438 | const struct of_device_id *matches, | |
439 | struct device *parent) | |
440 | { | |
441 | struct device_node *child; | |
5fd200f3 GL |
442 | int rc = 0; |
443 | ||
1eed4c07 GL |
444 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
445 | if (!root) | |
60d59913 | 446 | return -EINVAL; |
5fd200f3 GL |
447 | |
448 | pr_debug("of_platform_bus_probe()\n"); | |
449 | pr_debug(" starting at: %s\n", root->full_name); | |
450 | ||
1eed4c07 | 451 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 452 | if (of_match_node(matches, root)) { |
15c3597d | 453 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 454 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
455 | if (!of_match_node(matches, child)) |
456 | continue; | |
15c3597d | 457 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
38e9e21d | 458 | if (rc) |
5fd200f3 | 459 | break; |
5fd200f3 | 460 | } |
38e9e21d | 461 | |
5fd200f3 GL |
462 | of_node_put(root); |
463 | return rc; | |
464 | } | |
465 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
466 | |
467 | /** | |
468 | * of_platform_populate() - Populate platform_devices from device tree data | |
469 | * @root: parent of the first level to probe or NULL for the root of the tree | |
470 | * @matches: match table, NULL to use the default | |
92039ed1 | 471 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
472 | * @parent: parent to hook devices from, NULL for toplevel |
473 | * | |
474 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
475 | * and creates devices from nodes. It differs in that it follows the modern | |
476 | * convention of requiring all device nodes to have a 'compatible' property, | |
477 | * and it is suitable for creating devices which are children of the root | |
478 | * node (of_platform_bus_probe will only create children of the root which | |
479 | * are selected by the @matches argument). | |
480 | * | |
481 | * New board support should be using this function instead of | |
482 | * of_platform_bus_probe(). | |
483 | * | |
484 | * Returns 0 on success, < 0 on failure. | |
485 | */ | |
486 | int of_platform_populate(struct device_node *root, | |
487 | const struct of_device_id *matches, | |
15c3597d | 488 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
489 | struct device *parent) |
490 | { | |
491 | struct device_node *child; | |
492 | int rc = 0; | |
493 | ||
494 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
495 | if (!root) | |
496 | return -EINVAL; | |
497 | ||
498 | for_each_child_of_node(root, child) { | |
15c3597d | 499 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
29d4f8a4 GL |
500 | if (rc) |
501 | break; | |
502 | } | |
503 | ||
504 | of_node_put(root); | |
505 | return rc; | |
506 | } | |
e001f1c8 | 507 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de PM |
508 | |
509 | static int of_platform_device_destroy(struct device *dev, void *data) | |
510 | { | |
511 | bool *children_left = data; | |
512 | ||
513 | /* Do not touch devices not populated from the device tree */ | |
514 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) { | |
515 | *children_left = true; | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* Recurse, but don't touch this device if it has any children left */ | |
520 | if (of_platform_depopulate(dev) != 0) { | |
521 | *children_left = true; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | if (dev->bus == &platform_bus_type) | |
526 | platform_device_unregister(to_platform_device(dev)); | |
527 | #ifdef CONFIG_ARM_AMBA | |
528 | else if (dev->bus == &amba_bustype) | |
529 | amba_device_unregister(to_amba_device(dev)); | |
530 | #endif | |
531 | else { | |
532 | *children_left = true; | |
533 | return 0; | |
534 | } | |
535 | ||
536 | of_node_clear_flag(dev->of_node, OF_POPULATED); | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | /** | |
542 | * of_platform_depopulate() - Remove devices populated from device tree | |
543 | * @parent: device which childred will be removed | |
544 | * | |
545 | * Complementary to of_platform_populate(), this function removes children | |
546 | * of the given device (and, recurrently, their children) that have been | |
547 | * created from their respective device tree nodes (and only those, | |
548 | * leaving others - eg. manually created - unharmed). | |
549 | * | |
550 | * Returns 0 when all children devices have been removed or | |
551 | * -EBUSY when some children remained. | |
552 | */ | |
553 | int of_platform_depopulate(struct device *parent) | |
554 | { | |
555 | bool children_left = false; | |
556 | ||
557 | device_for_each_child(parent, &children_left, | |
558 | of_platform_device_destroy); | |
559 | ||
560 | return children_left ? -EBUSY : 0; | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
563 | ||
964dba28 | 564 | #endif /* CONFIG_OF_ADDRESS */ |