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Commit | Line | Data |
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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 | */ | |
611cad72 | 20 | #include <linux/ctype.h> |
97e873e5 SR |
21 | #include <linux/module.h> |
22 | #include <linux/of.h> | |
581b605a | 23 | #include <linux/spinlock.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
a9f2f63a | 25 | #include <linux/proc_fs.h> |
581b605a | 26 | |
ced4eec9 | 27 | #include "of_private.h" |
611cad72 | 28 | |
ced4eec9 | 29 | LIST_HEAD(aliases_lookup); |
611cad72 | 30 | |
465aac6d RD |
31 | struct device_node *of_allnodes; |
32 | EXPORT_SYMBOL(of_allnodes); | |
fc0bdae4 | 33 | struct device_node *of_chosen; |
611cad72 SG |
34 | struct device_node *of_aliases; |
35 | ||
ced4eec9 | 36 | DEFINE_MUTEX(of_aliases_mutex); |
1ef4d424 | 37 | |
581b605a SR |
38 | /* use when traversing tree through the allnext, child, sibling, |
39 | * or parent members of struct device_node. | |
40 | */ | |
d6d3c4e6 | 41 | DEFINE_RAW_SPINLOCK(devtree_lock); |
97e873e5 SR |
42 | |
43 | int of_n_addr_cells(struct device_node *np) | |
44 | { | |
a9fadeef | 45 | const __be32 *ip; |
97e873e5 SR |
46 | |
47 | do { | |
48 | if (np->parent) | |
49 | np = np->parent; | |
50 | ip = of_get_property(np, "#address-cells", NULL); | |
51 | if (ip) | |
33714881 | 52 | return be32_to_cpup(ip); |
97e873e5 SR |
53 | } while (np->parent); |
54 | /* No #address-cells property for the root node */ | |
55 | return OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
56 | } | |
57 | EXPORT_SYMBOL(of_n_addr_cells); | |
58 | ||
59 | int of_n_size_cells(struct device_node *np) | |
60 | { | |
a9fadeef | 61 | const __be32 *ip; |
97e873e5 SR |
62 | |
63 | do { | |
64 | if (np->parent) | |
65 | np = np->parent; | |
66 | ip = of_get_property(np, "#size-cells", NULL); | |
67 | if (ip) | |
33714881 | 68 | return be32_to_cpup(ip); |
97e873e5 SR |
69 | } while (np->parent); |
70 | /* No #size-cells property for the root node */ | |
71 | return OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
72 | } | |
73 | EXPORT_SYMBOL(of_n_size_cells); | |
74 | ||
0f22dd39 | 75 | #if defined(CONFIG_OF_DYNAMIC) |
923f7e30 GL |
76 | /** |
77 | * of_node_get - Increment refcount of a node | |
78 | * @node: Node to inc refcount, NULL is supported to | |
79 | * simplify writing of callers | |
80 | * | |
81 | * Returns node. | |
82 | */ | |
83 | struct device_node *of_node_get(struct device_node *node) | |
84 | { | |
85 | if (node) | |
86 | kref_get(&node->kref); | |
87 | return node; | |
88 | } | |
89 | EXPORT_SYMBOL(of_node_get); | |
90 | ||
91 | static inline struct device_node *kref_to_device_node(struct kref *kref) | |
92 | { | |
93 | return container_of(kref, struct device_node, kref); | |
94 | } | |
95 | ||
96 | /** | |
97 | * of_node_release - release a dynamically allocated node | |
98 | * @kref: kref element of the node to be released | |
99 | * | |
100 | * In of_node_put() this function is passed to kref_put() | |
101 | * as the destructor. | |
102 | */ | |
103 | static void of_node_release(struct kref *kref) | |
104 | { | |
105 | struct device_node *node = kref_to_device_node(kref); | |
106 | struct property *prop = node->properties; | |
107 | ||
108 | /* We should never be releasing nodes that haven't been detached. */ | |
109 | if (!of_node_check_flag(node, OF_DETACHED)) { | |
110 | pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name); | |
111 | dump_stack(); | |
112 | kref_init(&node->kref); | |
113 | return; | |
114 | } | |
115 | ||
116 | if (!of_node_check_flag(node, OF_DYNAMIC)) | |
117 | return; | |
118 | ||
119 | while (prop) { | |
120 | struct property *next = prop->next; | |
121 | kfree(prop->name); | |
122 | kfree(prop->value); | |
123 | kfree(prop); | |
124 | prop = next; | |
125 | ||
126 | if (!prop) { | |
127 | prop = node->deadprops; | |
128 | node->deadprops = NULL; | |
129 | } | |
130 | } | |
131 | kfree(node->full_name); | |
132 | kfree(node->data); | |
133 | kfree(node); | |
134 | } | |
135 | ||
136 | /** | |
137 | * of_node_put - Decrement refcount of a node | |
138 | * @node: Node to dec refcount, NULL is supported to | |
139 | * simplify writing of callers | |
140 | * | |
141 | */ | |
142 | void of_node_put(struct device_node *node) | |
143 | { | |
144 | if (node) | |
145 | kref_put(&node->kref, of_node_release); | |
146 | } | |
147 | EXPORT_SYMBOL(of_node_put); | |
0f22dd39 | 148 | #endif /* CONFIG_OF_DYNAMIC */ |
923f7e30 | 149 | |
28d0e36b TG |
150 | static struct property *__of_find_property(const struct device_node *np, |
151 | const char *name, int *lenp) | |
581b605a SR |
152 | { |
153 | struct property *pp; | |
154 | ||
64e4566f TT |
155 | if (!np) |
156 | return NULL; | |
157 | ||
a3a7cab1 | 158 | for (pp = np->properties; pp; pp = pp->next) { |
581b605a | 159 | if (of_prop_cmp(pp->name, name) == 0) { |
a3a7cab1 | 160 | if (lenp) |
581b605a SR |
161 | *lenp = pp->length; |
162 | break; | |
163 | } | |
164 | } | |
28d0e36b TG |
165 | |
166 | return pp; | |
167 | } | |
168 | ||
169 | struct property *of_find_property(const struct device_node *np, | |
170 | const char *name, | |
171 | int *lenp) | |
172 | { | |
173 | struct property *pp; | |
d6d3c4e6 | 174 | unsigned long flags; |
28d0e36b | 175 | |
d6d3c4e6 | 176 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 177 | pp = __of_find_property(np, name, lenp); |
d6d3c4e6 | 178 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
581b605a SR |
179 | |
180 | return pp; | |
181 | } | |
182 | EXPORT_SYMBOL(of_find_property); | |
183 | ||
e91edcf5 GL |
184 | /** |
185 | * of_find_all_nodes - Get next node in global list | |
186 | * @prev: Previous node or NULL to start iteration | |
187 | * of_node_put() will be called on it | |
188 | * | |
189 | * Returns a node pointer with refcount incremented, use | |
190 | * of_node_put() on it when done. | |
191 | */ | |
192 | struct device_node *of_find_all_nodes(struct device_node *prev) | |
193 | { | |
194 | struct device_node *np; | |
195 | ||
d6d3c4e6 | 196 | raw_spin_lock(&devtree_lock); |
465aac6d | 197 | np = prev ? prev->allnext : of_allnodes; |
e91edcf5 GL |
198 | for (; np != NULL; np = np->allnext) |
199 | if (of_node_get(np)) | |
200 | break; | |
201 | of_node_put(prev); | |
d6d3c4e6 | 202 | raw_spin_unlock(&devtree_lock); |
e91edcf5 GL |
203 | return np; |
204 | } | |
205 | EXPORT_SYMBOL(of_find_all_nodes); | |
206 | ||
28d0e36b TG |
207 | /* |
208 | * Find a property with a given name for a given node | |
209 | * and return the value. | |
210 | */ | |
211 | static const void *__of_get_property(const struct device_node *np, | |
212 | const char *name, int *lenp) | |
213 | { | |
214 | struct property *pp = __of_find_property(np, name, lenp); | |
215 | ||
216 | return pp ? pp->value : NULL; | |
217 | } | |
218 | ||
97e873e5 SR |
219 | /* |
220 | * Find a property with a given name for a given node | |
221 | * and return the value. | |
222 | */ | |
223 | const void *of_get_property(const struct device_node *np, const char *name, | |
28d0e36b | 224 | int *lenp) |
97e873e5 SR |
225 | { |
226 | struct property *pp = of_find_property(np, name, lenp); | |
227 | ||
228 | return pp ? pp->value : NULL; | |
229 | } | |
230 | EXPORT_SYMBOL(of_get_property); | |
0081cbc3 SR |
231 | |
232 | /** Checks if the given "compat" string matches one of the strings in | |
233 | * the device's "compatible" property | |
234 | */ | |
28d0e36b TG |
235 | static int __of_device_is_compatible(const struct device_node *device, |
236 | const char *compat) | |
0081cbc3 SR |
237 | { |
238 | const char* cp; | |
239 | int cplen, l; | |
240 | ||
28d0e36b | 241 | cp = __of_get_property(device, "compatible", &cplen); |
0081cbc3 SR |
242 | if (cp == NULL) |
243 | return 0; | |
244 | while (cplen > 0) { | |
245 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) | |
246 | return 1; | |
247 | l = strlen(cp) + 1; | |
248 | cp += l; | |
249 | cplen -= l; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
28d0e36b TG |
254 | |
255 | /** Checks if the given "compat" string matches one of the strings in | |
256 | * the device's "compatible" property | |
257 | */ | |
258 | int of_device_is_compatible(const struct device_node *device, | |
259 | const char *compat) | |
260 | { | |
d6d3c4e6 | 261 | unsigned long flags; |
28d0e36b TG |
262 | int res; |
263 | ||
d6d3c4e6 | 264 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 265 | res = __of_device_is_compatible(device, compat); |
d6d3c4e6 | 266 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
267 | return res; |
268 | } | |
0081cbc3 | 269 | EXPORT_SYMBOL(of_device_is_compatible); |
e679c5f4 | 270 | |
1f43cfb9 | 271 | /** |
71a157e8 | 272 | * of_machine_is_compatible - Test root of device tree for a given compatible value |
1f43cfb9 GL |
273 | * @compat: compatible string to look for in root node's compatible property. |
274 | * | |
275 | * Returns true if the root node has the given value in its | |
276 | * compatible property. | |
277 | */ | |
71a157e8 | 278 | int of_machine_is_compatible(const char *compat) |
1f43cfb9 GL |
279 | { |
280 | struct device_node *root; | |
281 | int rc = 0; | |
282 | ||
283 | root = of_find_node_by_path("/"); | |
284 | if (root) { | |
285 | rc = of_device_is_compatible(root, compat); | |
286 | of_node_put(root); | |
287 | } | |
288 | return rc; | |
289 | } | |
71a157e8 | 290 | EXPORT_SYMBOL(of_machine_is_compatible); |
1f43cfb9 | 291 | |
834d97d4 | 292 | /** |
c31a0c05 | 293 | * __of_device_is_available - check if a device is available for use |
834d97d4 | 294 | * |
c31a0c05 | 295 | * @device: Node to check for availability, with locks already held |
834d97d4 JB |
296 | * |
297 | * Returns 1 if the status property is absent or set to "okay" or "ok", | |
298 | * 0 otherwise | |
299 | */ | |
c31a0c05 | 300 | static int __of_device_is_available(const struct device_node *device) |
834d97d4 JB |
301 | { |
302 | const char *status; | |
303 | int statlen; | |
304 | ||
c31a0c05 | 305 | status = __of_get_property(device, "status", &statlen); |
834d97d4 JB |
306 | if (status == NULL) |
307 | return 1; | |
308 | ||
309 | if (statlen > 0) { | |
310 | if (!strcmp(status, "okay") || !strcmp(status, "ok")) | |
311 | return 1; | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
c31a0c05 SW |
316 | |
317 | /** | |
318 | * of_device_is_available - check if a device is available for use | |
319 | * | |
320 | * @device: Node to check for availability | |
321 | * | |
322 | * Returns 1 if the status property is absent or set to "okay" or "ok", | |
323 | * 0 otherwise | |
324 | */ | |
325 | int of_device_is_available(const struct device_node *device) | |
326 | { | |
327 | unsigned long flags; | |
328 | int res; | |
329 | ||
330 | raw_spin_lock_irqsave(&devtree_lock, flags); | |
331 | res = __of_device_is_available(device); | |
332 | raw_spin_unlock_irqrestore(&devtree_lock, flags); | |
333 | return res; | |
334 | ||
335 | } | |
834d97d4 JB |
336 | EXPORT_SYMBOL(of_device_is_available); |
337 | ||
e679c5f4 SR |
338 | /** |
339 | * of_get_parent - Get a node's parent if any | |
340 | * @node: Node to get parent | |
341 | * | |
342 | * Returns a node pointer with refcount incremented, use | |
343 | * of_node_put() on it when done. | |
344 | */ | |
345 | struct device_node *of_get_parent(const struct device_node *node) | |
346 | { | |
347 | struct device_node *np; | |
d6d3c4e6 | 348 | unsigned long flags; |
e679c5f4 SR |
349 | |
350 | if (!node) | |
351 | return NULL; | |
352 | ||
d6d3c4e6 | 353 | raw_spin_lock_irqsave(&devtree_lock, flags); |
e679c5f4 | 354 | np = of_node_get(node->parent); |
d6d3c4e6 | 355 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e679c5f4 SR |
356 | return np; |
357 | } | |
358 | EXPORT_SYMBOL(of_get_parent); | |
d1cd355a | 359 | |
f4eb0107 ME |
360 | /** |
361 | * of_get_next_parent - Iterate to a node's parent | |
362 | * @node: Node to get parent of | |
363 | * | |
364 | * This is like of_get_parent() except that it drops the | |
365 | * refcount on the passed node, making it suitable for iterating | |
366 | * through a node's parents. | |
367 | * | |
368 | * Returns a node pointer with refcount incremented, use | |
369 | * of_node_put() on it when done. | |
370 | */ | |
371 | struct device_node *of_get_next_parent(struct device_node *node) | |
372 | { | |
373 | struct device_node *parent; | |
d6d3c4e6 | 374 | unsigned long flags; |
f4eb0107 ME |
375 | |
376 | if (!node) | |
377 | return NULL; | |
378 | ||
d6d3c4e6 | 379 | raw_spin_lock_irqsave(&devtree_lock, flags); |
f4eb0107 ME |
380 | parent = of_node_get(node->parent); |
381 | of_node_put(node); | |
d6d3c4e6 | 382 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
f4eb0107 ME |
383 | return parent; |
384 | } | |
6695be68 | 385 | EXPORT_SYMBOL(of_get_next_parent); |
f4eb0107 | 386 | |
d1cd355a SR |
387 | /** |
388 | * of_get_next_child - Iterate a node childs | |
389 | * @node: parent node | |
390 | * @prev: previous child of the parent node, or NULL to get first | |
391 | * | |
392 | * Returns a node pointer with refcount incremented, use | |
393 | * of_node_put() on it when done. | |
394 | */ | |
395 | struct device_node *of_get_next_child(const struct device_node *node, | |
396 | struct device_node *prev) | |
397 | { | |
398 | struct device_node *next; | |
d6d3c4e6 | 399 | unsigned long flags; |
d1cd355a | 400 | |
d6d3c4e6 | 401 | raw_spin_lock_irqsave(&devtree_lock, flags); |
d1cd355a SR |
402 | next = prev ? prev->sibling : node->child; |
403 | for (; next; next = next->sibling) | |
404 | if (of_node_get(next)) | |
405 | break; | |
406 | of_node_put(prev); | |
d6d3c4e6 | 407 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
d1cd355a SR |
408 | return next; |
409 | } | |
410 | EXPORT_SYMBOL(of_get_next_child); | |
1ef4d424 | 411 | |
3296193d TT |
412 | /** |
413 | * of_get_next_available_child - Find the next available child node | |
414 | * @node: parent node | |
415 | * @prev: previous child of the parent node, or NULL to get first | |
416 | * | |
417 | * This function is like of_get_next_child(), except that it | |
418 | * automatically skips any disabled nodes (i.e. status = "disabled"). | |
419 | */ | |
420 | struct device_node *of_get_next_available_child(const struct device_node *node, | |
421 | struct device_node *prev) | |
422 | { | |
423 | struct device_node *next; | |
424 | ||
d6d3c4e6 | 425 | raw_spin_lock(&devtree_lock); |
3296193d TT |
426 | next = prev ? prev->sibling : node->child; |
427 | for (; next; next = next->sibling) { | |
c31a0c05 | 428 | if (!__of_device_is_available(next)) |
3296193d TT |
429 | continue; |
430 | if (of_node_get(next)) | |
431 | break; | |
432 | } | |
433 | of_node_put(prev); | |
d6d3c4e6 | 434 | raw_spin_unlock(&devtree_lock); |
3296193d TT |
435 | return next; |
436 | } | |
437 | EXPORT_SYMBOL(of_get_next_available_child); | |
438 | ||
9c19761a SK |
439 | /** |
440 | * of_get_child_by_name - Find the child node by name for a given parent | |
441 | * @node: parent node | |
442 | * @name: child name to look for. | |
443 | * | |
444 | * This function looks for child node for given matching name | |
445 | * | |
446 | * Returns a node pointer if found, with refcount incremented, use | |
447 | * of_node_put() on it when done. | |
448 | * Returns NULL if node is not found. | |
449 | */ | |
450 | struct device_node *of_get_child_by_name(const struct device_node *node, | |
451 | const char *name) | |
452 | { | |
453 | struct device_node *child; | |
454 | ||
455 | for_each_child_of_node(node, child) | |
456 | if (child->name && (of_node_cmp(child->name, name) == 0)) | |
457 | break; | |
458 | return child; | |
459 | } | |
460 | EXPORT_SYMBOL(of_get_child_by_name); | |
461 | ||
1ef4d424 SR |
462 | /** |
463 | * of_find_node_by_path - Find a node matching a full OF path | |
464 | * @path: The full path to match | |
465 | * | |
466 | * Returns a node pointer with refcount incremented, use | |
467 | * of_node_put() on it when done. | |
468 | */ | |
469 | struct device_node *of_find_node_by_path(const char *path) | |
470 | { | |
465aac6d | 471 | struct device_node *np = of_allnodes; |
d6d3c4e6 | 472 | unsigned long flags; |
1ef4d424 | 473 | |
d6d3c4e6 | 474 | raw_spin_lock_irqsave(&devtree_lock, flags); |
1ef4d424 SR |
475 | for (; np; np = np->allnext) { |
476 | if (np->full_name && (of_node_cmp(np->full_name, path) == 0) | |
477 | && of_node_get(np)) | |
478 | break; | |
479 | } | |
d6d3c4e6 | 480 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
481 | return np; |
482 | } | |
483 | EXPORT_SYMBOL(of_find_node_by_path); | |
484 | ||
485 | /** | |
486 | * of_find_node_by_name - Find a node by its "name" property | |
487 | * @from: The node to start searching from or NULL, the node | |
488 | * you pass will not be searched, only the next one | |
489 | * will; typically, you pass what the previous call | |
490 | * returned. of_node_put() will be called on it | |
491 | * @name: The name string to match against | |
492 | * | |
493 | * Returns a node pointer with refcount incremented, use | |
494 | * of_node_put() on it when done. | |
495 | */ | |
496 | struct device_node *of_find_node_by_name(struct device_node *from, | |
497 | const char *name) | |
498 | { | |
499 | struct device_node *np; | |
d6d3c4e6 | 500 | unsigned long flags; |
1ef4d424 | 501 | |
d6d3c4e6 | 502 | raw_spin_lock_irqsave(&devtree_lock, flags); |
465aac6d | 503 | np = from ? from->allnext : of_allnodes; |
1ef4d424 SR |
504 | for (; np; np = np->allnext) |
505 | if (np->name && (of_node_cmp(np->name, name) == 0) | |
506 | && of_node_get(np)) | |
507 | break; | |
508 | of_node_put(from); | |
d6d3c4e6 | 509 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
510 | return np; |
511 | } | |
512 | EXPORT_SYMBOL(of_find_node_by_name); | |
513 | ||
514 | /** | |
515 | * of_find_node_by_type - Find a node by its "device_type" property | |
516 | * @from: The node to start searching from, or NULL to start searching | |
517 | * the entire device tree. The node you pass will not be | |
518 | * searched, only the next one will; typically, you pass | |
519 | * what the previous call returned. of_node_put() will be | |
520 | * called on from for you. | |
521 | * @type: The type string to match against | |
522 | * | |
523 | * Returns a node pointer with refcount incremented, use | |
524 | * of_node_put() on it when done. | |
525 | */ | |
526 | struct device_node *of_find_node_by_type(struct device_node *from, | |
527 | const char *type) | |
528 | { | |
529 | struct device_node *np; | |
d6d3c4e6 | 530 | unsigned long flags; |
1ef4d424 | 531 | |
d6d3c4e6 | 532 | raw_spin_lock_irqsave(&devtree_lock, flags); |
465aac6d | 533 | np = from ? from->allnext : of_allnodes; |
1ef4d424 SR |
534 | for (; np; np = np->allnext) |
535 | if (np->type && (of_node_cmp(np->type, type) == 0) | |
536 | && of_node_get(np)) | |
537 | break; | |
538 | of_node_put(from); | |
d6d3c4e6 | 539 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
540 | return np; |
541 | } | |
542 | EXPORT_SYMBOL(of_find_node_by_type); | |
543 | ||
544 | /** | |
545 | * of_find_compatible_node - Find a node based on type and one of the | |
546 | * tokens in its "compatible" property | |
547 | * @from: The node to start searching from or NULL, the node | |
548 | * you pass will not be searched, only the next one | |
549 | * will; typically, you pass what the previous call | |
550 | * returned. of_node_put() will be called on it | |
551 | * @type: The type string to match "device_type" or NULL to ignore | |
552 | * @compatible: The string to match to one of the tokens in the device | |
553 | * "compatible" list. | |
554 | * | |
555 | * Returns a node pointer with refcount incremented, use | |
556 | * of_node_put() on it when done. | |
557 | */ | |
558 | struct device_node *of_find_compatible_node(struct device_node *from, | |
559 | const char *type, const char *compatible) | |
560 | { | |
561 | struct device_node *np; | |
d6d3c4e6 | 562 | unsigned long flags; |
1ef4d424 | 563 | |
d6d3c4e6 | 564 | raw_spin_lock_irqsave(&devtree_lock, flags); |
465aac6d | 565 | np = from ? from->allnext : of_allnodes; |
1ef4d424 SR |
566 | for (; np; np = np->allnext) { |
567 | if (type | |
568 | && !(np->type && (of_node_cmp(np->type, type) == 0))) | |
569 | continue; | |
28d0e36b TG |
570 | if (__of_device_is_compatible(np, compatible) && |
571 | of_node_get(np)) | |
1ef4d424 SR |
572 | break; |
573 | } | |
574 | of_node_put(from); | |
d6d3c4e6 | 575 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
576 | return np; |
577 | } | |
578 | EXPORT_SYMBOL(of_find_compatible_node); | |
283029d1 | 579 | |
1e291b14 ME |
580 | /** |
581 | * of_find_node_with_property - Find a node which has a property with | |
582 | * the given name. | |
583 | * @from: The node to start searching from or NULL, the node | |
584 | * you pass will not be searched, only the next one | |
585 | * will; typically, you pass what the previous call | |
586 | * returned. of_node_put() will be called on it | |
587 | * @prop_name: The name of the property to look for. | |
588 | * | |
589 | * Returns a node pointer with refcount incremented, use | |
590 | * of_node_put() on it when done. | |
591 | */ | |
592 | struct device_node *of_find_node_with_property(struct device_node *from, | |
593 | const char *prop_name) | |
594 | { | |
595 | struct device_node *np; | |
596 | struct property *pp; | |
d6d3c4e6 | 597 | unsigned long flags; |
1e291b14 | 598 | |
d6d3c4e6 | 599 | raw_spin_lock_irqsave(&devtree_lock, flags); |
465aac6d | 600 | np = from ? from->allnext : of_allnodes; |
1e291b14 | 601 | for (; np; np = np->allnext) { |
a3a7cab1 | 602 | for (pp = np->properties; pp; pp = pp->next) { |
1e291b14 ME |
603 | if (of_prop_cmp(pp->name, prop_name) == 0) { |
604 | of_node_get(np); | |
605 | goto out; | |
606 | } | |
607 | } | |
608 | } | |
609 | out: | |
610 | of_node_put(from); | |
d6d3c4e6 | 611 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1e291b14 ME |
612 | return np; |
613 | } | |
614 | EXPORT_SYMBOL(of_find_node_with_property); | |
615 | ||
28d0e36b TG |
616 | static |
617 | const struct of_device_id *__of_match_node(const struct of_device_id *matches, | |
618 | const struct device_node *node) | |
283029d1 | 619 | { |
a52f07ec GL |
620 | if (!matches) |
621 | return NULL; | |
622 | ||
283029d1 GL |
623 | while (matches->name[0] || matches->type[0] || matches->compatible[0]) { |
624 | int match = 1; | |
625 | if (matches->name[0]) | |
626 | match &= node->name | |
627 | && !strcmp(matches->name, node->name); | |
628 | if (matches->type[0]) | |
629 | match &= node->type | |
630 | && !strcmp(matches->type, node->type); | |
bc51b0c2 | 631 | if (matches->compatible[0]) |
28d0e36b TG |
632 | match &= __of_device_is_compatible(node, |
633 | matches->compatible); | |
bc51b0c2 | 634 | if (match) |
283029d1 GL |
635 | return matches; |
636 | matches++; | |
637 | } | |
638 | return NULL; | |
639 | } | |
28d0e36b TG |
640 | |
641 | /** | |
642 | * of_match_node - Tell if an device_node has a matching of_match structure | |
643 | * @matches: array of of device match structures to search in | |
644 | * @node: the of device structure to match against | |
645 | * | |
646 | * Low level utility function used by device matching. | |
647 | */ | |
648 | const struct of_device_id *of_match_node(const struct of_device_id *matches, | |
649 | const struct device_node *node) | |
650 | { | |
651 | const struct of_device_id *match; | |
d6d3c4e6 | 652 | unsigned long flags; |
28d0e36b | 653 | |
d6d3c4e6 | 654 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 655 | match = __of_match_node(matches, node); |
d6d3c4e6 | 656 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
657 | return match; |
658 | } | |
283029d1 GL |
659 | EXPORT_SYMBOL(of_match_node); |
660 | ||
661 | /** | |
50c8af4c SW |
662 | * of_find_matching_node_and_match - Find a node based on an of_device_id |
663 | * match table. | |
283029d1 GL |
664 | * @from: The node to start searching from or NULL, the node |
665 | * you pass will not be searched, only the next one | |
666 | * will; typically, you pass what the previous call | |
667 | * returned. of_node_put() will be called on it | |
668 | * @matches: array of of device match structures to search in | |
50c8af4c | 669 | * @match Updated to point at the matches entry which matched |
283029d1 GL |
670 | * |
671 | * Returns a node pointer with refcount incremented, use | |
672 | * of_node_put() on it when done. | |
673 | */ | |
50c8af4c SW |
674 | struct device_node *of_find_matching_node_and_match(struct device_node *from, |
675 | const struct of_device_id *matches, | |
676 | const struct of_device_id **match) | |
283029d1 GL |
677 | { |
678 | struct device_node *np; | |
dc71bcf1 | 679 | const struct of_device_id *m; |
d6d3c4e6 | 680 | unsigned long flags; |
283029d1 | 681 | |
50c8af4c SW |
682 | if (match) |
683 | *match = NULL; | |
684 | ||
d6d3c4e6 | 685 | raw_spin_lock_irqsave(&devtree_lock, flags); |
465aac6d | 686 | np = from ? from->allnext : of_allnodes; |
283029d1 | 687 | for (; np; np = np->allnext) { |
28d0e36b | 688 | m = __of_match_node(matches, np); |
dc71bcf1 | 689 | if (m && of_node_get(np)) { |
50c8af4c | 690 | if (match) |
dc71bcf1 | 691 | *match = m; |
283029d1 | 692 | break; |
50c8af4c | 693 | } |
283029d1 GL |
694 | } |
695 | of_node_put(from); | |
d6d3c4e6 | 696 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
283029d1 GL |
697 | return np; |
698 | } | |
80c2022e | 699 | EXPORT_SYMBOL(of_find_matching_node_and_match); |
3f07af49 | 700 | |
3f07af49 GL |
701 | /** |
702 | * of_modalias_node - Lookup appropriate modalias for a device node | |
703 | * @node: pointer to a device tree node | |
704 | * @modalias: Pointer to buffer that modalias value will be copied into | |
705 | * @len: Length of modalias value | |
706 | * | |
2ffe8c5f GL |
707 | * Based on the value of the compatible property, this routine will attempt |
708 | * to choose an appropriate modalias value for a particular device tree node. | |
709 | * It does this by stripping the manufacturer prefix (as delimited by a ',') | |
710 | * from the first entry in the compatible list property. | |
3f07af49 | 711 | * |
2ffe8c5f | 712 | * This routine returns 0 on success, <0 on failure. |
3f07af49 GL |
713 | */ |
714 | int of_modalias_node(struct device_node *node, char *modalias, int len) | |
715 | { | |
2ffe8c5f GL |
716 | const char *compatible, *p; |
717 | int cplen; | |
3f07af49 GL |
718 | |
719 | compatible = of_get_property(node, "compatible", &cplen); | |
2ffe8c5f | 720 | if (!compatible || strlen(compatible) > cplen) |
3f07af49 | 721 | return -ENODEV; |
3f07af49 | 722 | p = strchr(compatible, ','); |
2ffe8c5f | 723 | strlcpy(modalias, p ? p + 1 : compatible, len); |
3f07af49 GL |
724 | return 0; |
725 | } | |
726 | EXPORT_SYMBOL_GPL(of_modalias_node); | |
727 | ||
89751a7c JK |
728 | /** |
729 | * of_find_node_by_phandle - Find a node given a phandle | |
730 | * @handle: phandle of the node to find | |
731 | * | |
732 | * Returns a node pointer with refcount incremented, use | |
733 | * of_node_put() on it when done. | |
734 | */ | |
735 | struct device_node *of_find_node_by_phandle(phandle handle) | |
736 | { | |
737 | struct device_node *np; | |
738 | ||
d6d3c4e6 | 739 | raw_spin_lock(&devtree_lock); |
465aac6d | 740 | for (np = of_allnodes; np; np = np->allnext) |
89751a7c JK |
741 | if (np->phandle == handle) |
742 | break; | |
743 | of_node_get(np); | |
d6d3c4e6 | 744 | raw_spin_unlock(&devtree_lock); |
89751a7c JK |
745 | return np; |
746 | } | |
747 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
748 | ||
daeec1f0 TP |
749 | /** |
750 | * of_find_property_value_of_size | |
751 | * | |
752 | * @np: device node from which the property value is to be read. | |
753 | * @propname: name of the property to be searched. | |
754 | * @len: requested length of property value | |
755 | * | |
756 | * Search for a property in a device node and valid the requested size. | |
757 | * Returns the property value on success, -EINVAL if the property does not | |
758 | * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the | |
759 | * property data isn't large enough. | |
760 | * | |
761 | */ | |
762 | static void *of_find_property_value_of_size(const struct device_node *np, | |
763 | const char *propname, u32 len) | |
764 | { | |
765 | struct property *prop = of_find_property(np, propname, NULL); | |
766 | ||
767 | if (!prop) | |
768 | return ERR_PTR(-EINVAL); | |
769 | if (!prop->value) | |
770 | return ERR_PTR(-ENODATA); | |
771 | if (len > prop->length) | |
772 | return ERR_PTR(-EOVERFLOW); | |
773 | ||
774 | return prop->value; | |
775 | } | |
776 | ||
3daf3726 TP |
777 | /** |
778 | * of_property_read_u32_index - Find and read a u32 from a multi-value property. | |
779 | * | |
780 | * @np: device node from which the property value is to be read. | |
781 | * @propname: name of the property to be searched. | |
782 | * @index: index of the u32 in the list of values | |
783 | * @out_value: pointer to return value, modified only if no error. | |
784 | * | |
785 | * Search for a property in a device node and read nth 32-bit value from | |
786 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
787 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
788 | * property data isn't large enough. | |
789 | * | |
790 | * The out_value is modified only if a valid u32 value can be decoded. | |
791 | */ | |
792 | int of_property_read_u32_index(const struct device_node *np, | |
793 | const char *propname, | |
794 | u32 index, u32 *out_value) | |
795 | { | |
daeec1f0 TP |
796 | const u32 *val = of_find_property_value_of_size(np, propname, |
797 | ((index + 1) * sizeof(*out_value))); | |
3daf3726 | 798 | |
daeec1f0 TP |
799 | if (IS_ERR(val)) |
800 | return PTR_ERR(val); | |
3daf3726 | 801 | |
daeec1f0 | 802 | *out_value = be32_to_cpup(((__be32 *)val) + index); |
3daf3726 TP |
803 | return 0; |
804 | } | |
805 | EXPORT_SYMBOL_GPL(of_property_read_u32_index); | |
806 | ||
be193249 VK |
807 | /** |
808 | * of_property_read_u8_array - Find and read an array of u8 from a property. | |
809 | * | |
810 | * @np: device node from which the property value is to be read. | |
811 | * @propname: name of the property to be searched. | |
812 | * @out_value: pointer to return value, modified only if return value is 0. | |
813 | * @sz: number of array elements to read | |
814 | * | |
815 | * Search for a property in a device node and read 8-bit value(s) from | |
816 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
817 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
818 | * property data isn't large enough. | |
819 | * | |
820 | * dts entry of array should be like: | |
821 | * property = /bits/ 8 <0x50 0x60 0x70>; | |
822 | * | |
823 | * The out_value is modified only if a valid u8 value can be decoded. | |
824 | */ | |
825 | int of_property_read_u8_array(const struct device_node *np, | |
826 | const char *propname, u8 *out_values, size_t sz) | |
827 | { | |
daeec1f0 TP |
828 | const u8 *val = of_find_property_value_of_size(np, propname, |
829 | (sz * sizeof(*out_values))); | |
be193249 | 830 | |
daeec1f0 TP |
831 | if (IS_ERR(val)) |
832 | return PTR_ERR(val); | |
be193249 | 833 | |
be193249 VK |
834 | while (sz--) |
835 | *out_values++ = *val++; | |
836 | return 0; | |
837 | } | |
838 | EXPORT_SYMBOL_GPL(of_property_read_u8_array); | |
839 | ||
840 | /** | |
841 | * of_property_read_u16_array - Find and read an array of u16 from a property. | |
842 | * | |
843 | * @np: device node from which the property value is to be read. | |
844 | * @propname: name of the property to be searched. | |
845 | * @out_value: pointer to return value, modified only if return value is 0. | |
846 | * @sz: number of array elements to read | |
847 | * | |
848 | * Search for a property in a device node and read 16-bit value(s) from | |
849 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
850 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
851 | * property data isn't large enough. | |
852 | * | |
853 | * dts entry of array should be like: | |
854 | * property = /bits/ 16 <0x5000 0x6000 0x7000>; | |
855 | * | |
856 | * The out_value is modified only if a valid u16 value can be decoded. | |
857 | */ | |
858 | int of_property_read_u16_array(const struct device_node *np, | |
859 | const char *propname, u16 *out_values, size_t sz) | |
860 | { | |
daeec1f0 TP |
861 | const __be16 *val = of_find_property_value_of_size(np, propname, |
862 | (sz * sizeof(*out_values))); | |
be193249 | 863 | |
daeec1f0 TP |
864 | if (IS_ERR(val)) |
865 | return PTR_ERR(val); | |
be193249 | 866 | |
be193249 VK |
867 | while (sz--) |
868 | *out_values++ = be16_to_cpup(val++); | |
869 | return 0; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(of_property_read_u16_array); | |
872 | ||
a3b85363 | 873 | /** |
0e373639 RH |
874 | * of_property_read_u32_array - Find and read an array of 32 bit integers |
875 | * from a property. | |
876 | * | |
a3b85363 TA |
877 | * @np: device node from which the property value is to be read. |
878 | * @propname: name of the property to be searched. | |
879 | * @out_value: pointer to return value, modified only if return value is 0. | |
be193249 | 880 | * @sz: number of array elements to read |
a3b85363 | 881 | * |
0e373639 | 882 | * Search for a property in a device node and read 32-bit value(s) from |
a3b85363 TA |
883 | * it. Returns 0 on success, -EINVAL if the property does not exist, |
884 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
885 | * property data isn't large enough. | |
886 | * | |
887 | * The out_value is modified only if a valid u32 value can be decoded. | |
888 | */ | |
aac285c6 JI |
889 | int of_property_read_u32_array(const struct device_node *np, |
890 | const char *propname, u32 *out_values, | |
891 | size_t sz) | |
a3b85363 | 892 | { |
daeec1f0 TP |
893 | const __be32 *val = of_find_property_value_of_size(np, propname, |
894 | (sz * sizeof(*out_values))); | |
a3b85363 | 895 | |
daeec1f0 TP |
896 | if (IS_ERR(val)) |
897 | return PTR_ERR(val); | |
0e373639 | 898 | |
0e373639 RH |
899 | while (sz--) |
900 | *out_values++ = be32_to_cpup(val++); | |
a3b85363 TA |
901 | return 0; |
902 | } | |
0e373639 | 903 | EXPORT_SYMBOL_GPL(of_property_read_u32_array); |
a3b85363 | 904 | |
4cd7f7a3 JI |
905 | /** |
906 | * of_property_read_u64 - Find and read a 64 bit integer from a property | |
907 | * @np: device node from which the property value is to be read. | |
908 | * @propname: name of the property to be searched. | |
909 | * @out_value: pointer to return value, modified only if return value is 0. | |
910 | * | |
911 | * Search for a property in a device node and read a 64-bit value from | |
912 | * it. Returns 0 on success, -EINVAL if the property does not exist, | |
913 | * -ENODATA if property does not have a value, and -EOVERFLOW if the | |
914 | * property data isn't large enough. | |
915 | * | |
916 | * The out_value is modified only if a valid u64 value can be decoded. | |
917 | */ | |
918 | int of_property_read_u64(const struct device_node *np, const char *propname, | |
919 | u64 *out_value) | |
920 | { | |
daeec1f0 TP |
921 | const __be32 *val = of_find_property_value_of_size(np, propname, |
922 | sizeof(*out_value)); | |
4cd7f7a3 | 923 | |
daeec1f0 TP |
924 | if (IS_ERR(val)) |
925 | return PTR_ERR(val); | |
926 | ||
927 | *out_value = of_read_number(val, 2); | |
4cd7f7a3 JI |
928 | return 0; |
929 | } | |
930 | EXPORT_SYMBOL_GPL(of_property_read_u64); | |
931 | ||
a3b85363 TA |
932 | /** |
933 | * of_property_read_string - Find and read a string from a property | |
934 | * @np: device node from which the property value is to be read. | |
935 | * @propname: name of the property to be searched. | |
936 | * @out_string: pointer to null terminated return string, modified only if | |
937 | * return value is 0. | |
938 | * | |
939 | * Search for a property in a device tree node and retrieve a null | |
940 | * terminated string value (pointer to data, not a copy). Returns 0 on | |
941 | * success, -EINVAL if the property does not exist, -ENODATA if property | |
942 | * does not have a value, and -EILSEQ if the string is not null-terminated | |
943 | * within the length of the property data. | |
944 | * | |
945 | * The out_string pointer is modified only if a valid string can be decoded. | |
946 | */ | |
aac285c6 | 947 | int of_property_read_string(struct device_node *np, const char *propname, |
f09bc831 | 948 | const char **out_string) |
a3b85363 TA |
949 | { |
950 | struct property *prop = of_find_property(np, propname, NULL); | |
951 | if (!prop) | |
952 | return -EINVAL; | |
953 | if (!prop->value) | |
954 | return -ENODATA; | |
955 | if (strnlen(prop->value, prop->length) >= prop->length) | |
956 | return -EILSEQ; | |
957 | *out_string = prop->value; | |
958 | return 0; | |
959 | } | |
960 | EXPORT_SYMBOL_GPL(of_property_read_string); | |
961 | ||
4fcd15a0 BC |
962 | /** |
963 | * of_property_read_string_index - Find and read a string from a multiple | |
964 | * strings property. | |
965 | * @np: device node from which the property value is to be read. | |
966 | * @propname: name of the property to be searched. | |
967 | * @index: index of the string in the list of strings | |
968 | * @out_string: pointer to null terminated return string, modified only if | |
969 | * return value is 0. | |
970 | * | |
971 | * Search for a property in a device tree node and retrieve a null | |
972 | * terminated string value (pointer to data, not a copy) in the list of strings | |
973 | * contained in that property. | |
974 | * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if | |
975 | * property does not have a value, and -EILSEQ if the string is not | |
976 | * null-terminated within the length of the property data. | |
977 | * | |
978 | * The out_string pointer is modified only if a valid string can be decoded. | |
979 | */ | |
980 | int of_property_read_string_index(struct device_node *np, const char *propname, | |
981 | int index, const char **output) | |
982 | { | |
983 | struct property *prop = of_find_property(np, propname, NULL); | |
984 | int i = 0; | |
985 | size_t l = 0, total = 0; | |
986 | const char *p; | |
987 | ||
988 | if (!prop) | |
989 | return -EINVAL; | |
990 | if (!prop->value) | |
991 | return -ENODATA; | |
992 | if (strnlen(prop->value, prop->length) >= prop->length) | |
993 | return -EILSEQ; | |
994 | ||
995 | p = prop->value; | |
996 | ||
997 | for (i = 0; total < prop->length; total += l, p += l) { | |
998 | l = strlen(p) + 1; | |
88af7f58 | 999 | if (i++ == index) { |
4fcd15a0 BC |
1000 | *output = p; |
1001 | return 0; | |
1002 | } | |
1003 | } | |
1004 | return -ENODATA; | |
1005 | } | |
1006 | EXPORT_SYMBOL_GPL(of_property_read_string_index); | |
1007 | ||
7aff0fe3 GL |
1008 | /** |
1009 | * of_property_match_string() - Find string in a list and return index | |
1010 | * @np: pointer to node containing string list property | |
1011 | * @propname: string list property name | |
1012 | * @string: pointer to string to search for in string list | |
1013 | * | |
1014 | * This function searches a string list property and returns the index | |
1015 | * of a specific string value. | |
1016 | */ | |
1017 | int of_property_match_string(struct device_node *np, const char *propname, | |
1018 | const char *string) | |
1019 | { | |
1020 | struct property *prop = of_find_property(np, propname, NULL); | |
1021 | size_t l; | |
1022 | int i; | |
1023 | const char *p, *end; | |
1024 | ||
1025 | if (!prop) | |
1026 | return -EINVAL; | |
1027 | if (!prop->value) | |
1028 | return -ENODATA; | |
1029 | ||
1030 | p = prop->value; | |
1031 | end = p + prop->length; | |
1032 | ||
1033 | for (i = 0; p < end; i++, p += l) { | |
1034 | l = strlen(p) + 1; | |
1035 | if (p + l > end) | |
1036 | return -EILSEQ; | |
1037 | pr_debug("comparing %s with %s\n", string, p); | |
1038 | if (strcmp(string, p) == 0) | |
1039 | return i; /* Found it; return index */ | |
1040 | } | |
1041 | return -ENODATA; | |
1042 | } | |
1043 | EXPORT_SYMBOL_GPL(of_property_match_string); | |
4fcd15a0 BC |
1044 | |
1045 | /** | |
1046 | * of_property_count_strings - Find and return the number of strings from a | |
1047 | * multiple strings property. | |
1048 | * @np: device node from which the property value is to be read. | |
1049 | * @propname: name of the property to be searched. | |
1050 | * | |
1051 | * Search for a property in a device tree node and retrieve the number of null | |
1052 | * terminated string contain in it. Returns the number of strings on | |
1053 | * success, -EINVAL if the property does not exist, -ENODATA if property | |
1054 | * does not have a value, and -EILSEQ if the string is not null-terminated | |
1055 | * within the length of the property data. | |
1056 | */ | |
1057 | int of_property_count_strings(struct device_node *np, const char *propname) | |
1058 | { | |
1059 | struct property *prop = of_find_property(np, propname, NULL); | |
1060 | int i = 0; | |
1061 | size_t l = 0, total = 0; | |
1062 | const char *p; | |
1063 | ||
1064 | if (!prop) | |
1065 | return -EINVAL; | |
1066 | if (!prop->value) | |
1067 | return -ENODATA; | |
1068 | if (strnlen(prop->value, prop->length) >= prop->length) | |
1069 | return -EILSEQ; | |
1070 | ||
1071 | p = prop->value; | |
1072 | ||
88af7f58 | 1073 | for (i = 0; total < prop->length; total += l, p += l, i++) |
4fcd15a0 | 1074 | l = strlen(p) + 1; |
88af7f58 | 1075 | |
4fcd15a0 BC |
1076 | return i; |
1077 | } | |
1078 | EXPORT_SYMBOL_GPL(of_property_count_strings); | |
1079 | ||
739649c5 GL |
1080 | /** |
1081 | * of_parse_phandle - Resolve a phandle property to a device_node pointer | |
1082 | * @np: Pointer to device node holding phandle property | |
1083 | * @phandle_name: Name of property holding a phandle value | |
1084 | * @index: For properties holding a table of phandles, this is the index into | |
1085 | * the table | |
1086 | * | |
1087 | * Returns the device_node pointer with refcount incremented. Use | |
1088 | * of_node_put() on it when done. | |
1089 | */ | |
b8fbdc42 ST |
1090 | struct device_node *of_parse_phandle(const struct device_node *np, |
1091 | const char *phandle_name, int index) | |
739649c5 | 1092 | { |
9a6b2e58 | 1093 | const __be32 *phandle; |
739649c5 GL |
1094 | int size; |
1095 | ||
1096 | phandle = of_get_property(np, phandle_name, &size); | |
1097 | if ((!phandle) || (size < sizeof(*phandle) * (index + 1))) | |
1098 | return NULL; | |
1099 | ||
9a6b2e58 | 1100 | return of_find_node_by_phandle(be32_to_cpup(phandle + index)); |
739649c5 GL |
1101 | } |
1102 | EXPORT_SYMBOL(of_parse_phandle); | |
1103 | ||
64b60e09 | 1104 | /** |
15c9a0ac | 1105 | * of_parse_phandle_with_args() - Find a node pointed by phandle in a list |
64b60e09 AV |
1106 | * @np: pointer to a device tree node containing a list |
1107 | * @list_name: property name that contains a list | |
1108 | * @cells_name: property name that specifies phandles' arguments count | |
1109 | * @index: index of a phandle to parse out | |
15c9a0ac | 1110 | * @out_args: optional pointer to output arguments structure (will be filled) |
64b60e09 AV |
1111 | * |
1112 | * This function is useful to parse lists of phandles and their arguments. | |
15c9a0ac GL |
1113 | * Returns 0 on success and fills out_args, on error returns appropriate |
1114 | * errno value. | |
1115 | * | |
1116 | * Caller is responsible to call of_node_put() on the returned out_args->node | |
1117 | * pointer. | |
64b60e09 AV |
1118 | * |
1119 | * Example: | |
1120 | * | |
1121 | * phandle1: node1 { | |
1122 | * #list-cells = <2>; | |
1123 | * } | |
1124 | * | |
1125 | * phandle2: node2 { | |
1126 | * #list-cells = <1>; | |
1127 | * } | |
1128 | * | |
1129 | * node3 { | |
1130 | * list = <&phandle1 1 2 &phandle2 3>; | |
1131 | * } | |
1132 | * | |
1133 | * To get a device_node of the `node2' node you may call this: | |
15c9a0ac | 1134 | * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args); |
64b60e09 | 1135 | */ |
bd69f73f GL |
1136 | static int __of_parse_phandle_with_args(const struct device_node *np, |
1137 | const char *list_name, | |
1138 | const char *cells_name, int index, | |
1139 | struct of_phandle_args *out_args) | |
64b60e09 | 1140 | { |
15c9a0ac | 1141 | const __be32 *list, *list_end; |
23ce04c0 | 1142 | int rc = 0, size, cur_index = 0; |
15c9a0ac | 1143 | uint32_t count = 0; |
64b60e09 | 1144 | struct device_node *node = NULL; |
15c9a0ac | 1145 | phandle phandle; |
64b60e09 | 1146 | |
15c9a0ac | 1147 | /* Retrieve the phandle list property */ |
64b60e09 | 1148 | list = of_get_property(np, list_name, &size); |
15c9a0ac | 1149 | if (!list) |
1af4c7f1 | 1150 | return -ENOENT; |
64b60e09 AV |
1151 | list_end = list + size / sizeof(*list); |
1152 | ||
15c9a0ac | 1153 | /* Loop over the phandles until all the requested entry is found */ |
64b60e09 | 1154 | while (list < list_end) { |
23ce04c0 | 1155 | rc = -EINVAL; |
15c9a0ac | 1156 | count = 0; |
64b60e09 | 1157 | |
15c9a0ac GL |
1158 | /* |
1159 | * If phandle is 0, then it is an empty entry with no | |
1160 | * arguments. Skip forward to the next entry. | |
1161 | */ | |
9a6b2e58 | 1162 | phandle = be32_to_cpup(list++); |
15c9a0ac GL |
1163 | if (phandle) { |
1164 | /* | |
1165 | * Find the provider node and parse the #*-cells | |
1166 | * property to determine the argument length | |
1167 | */ | |
1168 | node = of_find_node_by_phandle(phandle); | |
1169 | if (!node) { | |
1170 | pr_err("%s: could not find phandle\n", | |
1171 | np->full_name); | |
23ce04c0 | 1172 | goto err; |
15c9a0ac GL |
1173 | } |
1174 | if (of_property_read_u32(node, cells_name, &count)) { | |
1175 | pr_err("%s: could not get %s for %s\n", | |
1176 | np->full_name, cells_name, | |
1177 | node->full_name); | |
23ce04c0 | 1178 | goto err; |
15c9a0ac | 1179 | } |
64b60e09 | 1180 | |
15c9a0ac GL |
1181 | /* |
1182 | * Make sure that the arguments actually fit in the | |
1183 | * remaining property data length | |
1184 | */ | |
1185 | if (list + count > list_end) { | |
1186 | pr_err("%s: arguments longer than property\n", | |
1187 | np->full_name); | |
23ce04c0 | 1188 | goto err; |
15c9a0ac | 1189 | } |
64b60e09 AV |
1190 | } |
1191 | ||
15c9a0ac GL |
1192 | /* |
1193 | * All of the error cases above bail out of the loop, so at | |
1194 | * this point, the parsing is successful. If the requested | |
1195 | * index matches, then fill the out_args structure and return, | |
1196 | * or return -ENOENT for an empty entry. | |
1197 | */ | |
23ce04c0 | 1198 | rc = -ENOENT; |
15c9a0ac GL |
1199 | if (cur_index == index) { |
1200 | if (!phandle) | |
23ce04c0 | 1201 | goto err; |
15c9a0ac GL |
1202 | |
1203 | if (out_args) { | |
1204 | int i; | |
1205 | if (WARN_ON(count > MAX_PHANDLE_ARGS)) | |
1206 | count = MAX_PHANDLE_ARGS; | |
1207 | out_args->np = node; | |
1208 | out_args->args_count = count; | |
1209 | for (i = 0; i < count; i++) | |
1210 | out_args->args[i] = be32_to_cpup(list++); | |
b855f16b TY |
1211 | } else { |
1212 | of_node_put(node); | |
15c9a0ac | 1213 | } |
23ce04c0 GL |
1214 | |
1215 | /* Found it! return success */ | |
15c9a0ac | 1216 | return 0; |
64b60e09 | 1217 | } |
64b60e09 AV |
1218 | |
1219 | of_node_put(node); | |
1220 | node = NULL; | |
15c9a0ac | 1221 | list += count; |
64b60e09 AV |
1222 | cur_index++; |
1223 | } | |
1224 | ||
23ce04c0 GL |
1225 | /* |
1226 | * Unlock node before returning result; will be one of: | |
1227 | * -ENOENT : index is for empty phandle | |
1228 | * -EINVAL : parsing error on data | |
bd69f73f | 1229 | * [1..n] : Number of phandle (count mode; when index = -1) |
23ce04c0 | 1230 | */ |
bd69f73f | 1231 | rc = index < 0 ? cur_index : -ENOENT; |
23ce04c0 | 1232 | err: |
15c9a0ac GL |
1233 | if (node) |
1234 | of_node_put(node); | |
23ce04c0 | 1235 | return rc; |
64b60e09 | 1236 | } |
bd69f73f GL |
1237 | |
1238 | int of_parse_phandle_with_args(const struct device_node *np, const char *list_name, | |
1239 | const char *cells_name, int index, | |
1240 | struct of_phandle_args *out_args) | |
1241 | { | |
1242 | if (index < 0) | |
1243 | return -EINVAL; | |
1244 | return __of_parse_phandle_with_args(np, list_name, cells_name, index, out_args); | |
1245 | } | |
15c9a0ac | 1246 | EXPORT_SYMBOL(of_parse_phandle_with_args); |
02af11b0 | 1247 | |
bd69f73f GL |
1248 | /** |
1249 | * of_count_phandle_with_args() - Find the number of phandles references in a property | |
1250 | * @np: pointer to a device tree node containing a list | |
1251 | * @list_name: property name that contains a list | |
1252 | * @cells_name: property name that specifies phandles' arguments count | |
1253 | * | |
1254 | * Returns the number of phandle + argument tuples within a property. It | |
1255 | * is a typical pattern to encode a list of phandle and variable | |
1256 | * arguments into a single property. The number of arguments is encoded | |
1257 | * by a property in the phandle-target node. For example, a gpios | |
1258 | * property would contain a list of GPIO specifies consisting of a | |
1259 | * phandle and 1 or more arguments. The number of arguments are | |
1260 | * determined by the #gpio-cells property in the node pointed to by the | |
1261 | * phandle. | |
1262 | */ | |
1263 | int of_count_phandle_with_args(const struct device_node *np, const char *list_name, | |
1264 | const char *cells_name) | |
1265 | { | |
1266 | return __of_parse_phandle_with_args(np, list_name, cells_name, -1, NULL); | |
1267 | } | |
1268 | EXPORT_SYMBOL(of_count_phandle_with_args); | |
1269 | ||
1cf3d8b3 NF |
1270 | #if defined(CONFIG_OF_DYNAMIC) |
1271 | static int of_property_notify(int action, struct device_node *np, | |
1272 | struct property *prop) | |
1273 | { | |
1274 | struct of_prop_reconfig pr; | |
1275 | ||
1276 | pr.dn = np; | |
1277 | pr.prop = prop; | |
1278 | return of_reconfig_notify(action, &pr); | |
1279 | } | |
1280 | #else | |
1281 | static int of_property_notify(int action, struct device_node *np, | |
1282 | struct property *prop) | |
1283 | { | |
1284 | return 0; | |
1285 | } | |
1286 | #endif | |
1287 | ||
02af11b0 | 1288 | /** |
79d1c712 | 1289 | * of_add_property - Add a property to a node |
02af11b0 | 1290 | */ |
79d1c712 | 1291 | int of_add_property(struct device_node *np, struct property *prop) |
02af11b0 GL |
1292 | { |
1293 | struct property **next; | |
1294 | unsigned long flags; | |
1cf3d8b3 NF |
1295 | int rc; |
1296 | ||
1297 | rc = of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop); | |
1298 | if (rc) | |
1299 | return rc; | |
02af11b0 GL |
1300 | |
1301 | prop->next = NULL; | |
d6d3c4e6 | 1302 | raw_spin_lock_irqsave(&devtree_lock, flags); |
02af11b0 GL |
1303 | next = &np->properties; |
1304 | while (*next) { | |
1305 | if (strcmp(prop->name, (*next)->name) == 0) { | |
1306 | /* duplicate ! don't insert it */ | |
d6d3c4e6 | 1307 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 GL |
1308 | return -1; |
1309 | } | |
1310 | next = &(*next)->next; | |
1311 | } | |
1312 | *next = prop; | |
d6d3c4e6 | 1313 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 GL |
1314 | |
1315 | #ifdef CONFIG_PROC_DEVICETREE | |
1316 | /* try to add to proc as well if it was initialized */ | |
1317 | if (np->pde) | |
1318 | proc_device_tree_add_prop(np->pde, prop); | |
1319 | #endif /* CONFIG_PROC_DEVICETREE */ | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | /** | |
79d1c712 | 1325 | * of_remove_property - Remove a property from a node. |
02af11b0 GL |
1326 | * |
1327 | * Note that we don't actually remove it, since we have given out | |
1328 | * who-knows-how-many pointers to the data using get-property. | |
1329 | * Instead we just move the property to the "dead properties" | |
1330 | * list, so it won't be found any more. | |
1331 | */ | |
79d1c712 | 1332 | int of_remove_property(struct device_node *np, struct property *prop) |
02af11b0 GL |
1333 | { |
1334 | struct property **next; | |
1335 | unsigned long flags; | |
1336 | int found = 0; | |
1cf3d8b3 NF |
1337 | int rc; |
1338 | ||
1339 | rc = of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop); | |
1340 | if (rc) | |
1341 | return rc; | |
02af11b0 | 1342 | |
d6d3c4e6 | 1343 | raw_spin_lock_irqsave(&devtree_lock, flags); |
02af11b0 GL |
1344 | next = &np->properties; |
1345 | while (*next) { | |
1346 | if (*next == prop) { | |
1347 | /* found the node */ | |
1348 | *next = prop->next; | |
1349 | prop->next = np->deadprops; | |
1350 | np->deadprops = prop; | |
1351 | found = 1; | |
1352 | break; | |
1353 | } | |
1354 | next = &(*next)->next; | |
1355 | } | |
d6d3c4e6 | 1356 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 GL |
1357 | |
1358 | if (!found) | |
1359 | return -ENODEV; | |
1360 | ||
1361 | #ifdef CONFIG_PROC_DEVICETREE | |
1362 | /* try to remove the proc node as well */ | |
1363 | if (np->pde) | |
1364 | proc_device_tree_remove_prop(np->pde, prop); | |
1365 | #endif /* CONFIG_PROC_DEVICETREE */ | |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | /* | |
79d1c712 | 1371 | * of_update_property - Update a property in a node, if the property does |
475d0094 | 1372 | * not exist, add it. |
02af11b0 GL |
1373 | * |
1374 | * Note that we don't actually remove it, since we have given out | |
1375 | * who-knows-how-many pointers to the data using get-property. | |
1376 | * Instead we just move the property to the "dead properties" list, | |
1377 | * and add the new property to the property list | |
1378 | */ | |
79d1c712 | 1379 | int of_update_property(struct device_node *np, struct property *newprop) |
02af11b0 | 1380 | { |
475d0094 | 1381 | struct property **next, *oldprop; |
02af11b0 | 1382 | unsigned long flags; |
1cf3d8b3 NF |
1383 | int rc, found = 0; |
1384 | ||
1385 | rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop); | |
1386 | if (rc) | |
1387 | return rc; | |
02af11b0 | 1388 | |
475d0094 DA |
1389 | if (!newprop->name) |
1390 | return -EINVAL; | |
1391 | ||
1392 | oldprop = of_find_property(np, newprop->name, NULL); | |
1393 | if (!oldprop) | |
79d1c712 | 1394 | return of_add_property(np, newprop); |
475d0094 | 1395 | |
d6d3c4e6 | 1396 | raw_spin_lock_irqsave(&devtree_lock, flags); |
02af11b0 GL |
1397 | next = &np->properties; |
1398 | while (*next) { | |
1399 | if (*next == oldprop) { | |
1400 | /* found the node */ | |
1401 | newprop->next = oldprop->next; | |
1402 | *next = newprop; | |
1403 | oldprop->next = np->deadprops; | |
1404 | np->deadprops = oldprop; | |
1405 | found = 1; | |
1406 | break; | |
1407 | } | |
1408 | next = &(*next)->next; | |
1409 | } | |
d6d3c4e6 | 1410 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 GL |
1411 | |
1412 | if (!found) | |
1413 | return -ENODEV; | |
1414 | ||
1415 | #ifdef CONFIG_PROC_DEVICETREE | |
1416 | /* try to add to proc as well if it was initialized */ | |
1417 | if (np->pde) | |
1418 | proc_device_tree_update_prop(np->pde, newprop, oldprop); | |
1419 | #endif /* CONFIG_PROC_DEVICETREE */ | |
1420 | ||
1421 | return 0; | |
1422 | } | |
fcdeb7fe GL |
1423 | |
1424 | #if defined(CONFIG_OF_DYNAMIC) | |
1425 | /* | |
1426 | * Support for dynamic device trees. | |
1427 | * | |
1428 | * On some platforms, the device tree can be manipulated at runtime. | |
1429 | * The routines in this section support adding, removing and changing | |
1430 | * device tree nodes. | |
1431 | */ | |
1432 | ||
1cf3d8b3 NF |
1433 | static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain); |
1434 | ||
1435 | int of_reconfig_notifier_register(struct notifier_block *nb) | |
1436 | { | |
1437 | return blocking_notifier_chain_register(&of_reconfig_chain, nb); | |
1438 | } | |
1a9bd454 | 1439 | EXPORT_SYMBOL_GPL(of_reconfig_notifier_register); |
1cf3d8b3 NF |
1440 | |
1441 | int of_reconfig_notifier_unregister(struct notifier_block *nb) | |
1442 | { | |
1443 | return blocking_notifier_chain_unregister(&of_reconfig_chain, nb); | |
1444 | } | |
1a9bd454 | 1445 | EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister); |
1cf3d8b3 NF |
1446 | |
1447 | int of_reconfig_notify(unsigned long action, void *p) | |
1448 | { | |
1449 | int rc; | |
1450 | ||
1451 | rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p); | |
1452 | return notifier_to_errno(rc); | |
1453 | } | |
1454 | ||
e81b3295 NF |
1455 | #ifdef CONFIG_PROC_DEVICETREE |
1456 | static void of_add_proc_dt_entry(struct device_node *dn) | |
1457 | { | |
1458 | struct proc_dir_entry *ent; | |
1459 | ||
1460 | ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); | |
1461 | if (ent) | |
1462 | proc_device_tree_add_node(dn, ent); | |
1463 | } | |
1464 | #else | |
1465 | static void of_add_proc_dt_entry(struct device_node *dn) | |
1466 | { | |
1467 | return; | |
1468 | } | |
1469 | #endif | |
1470 | ||
fcdeb7fe GL |
1471 | /** |
1472 | * of_attach_node - Plug a device node into the tree and global list. | |
1473 | */ | |
1cf3d8b3 | 1474 | int of_attach_node(struct device_node *np) |
fcdeb7fe GL |
1475 | { |
1476 | unsigned long flags; | |
1cf3d8b3 NF |
1477 | int rc; |
1478 | ||
1479 | rc = of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, np); | |
1480 | if (rc) | |
1481 | return rc; | |
fcdeb7fe | 1482 | |
d6d3c4e6 | 1483 | raw_spin_lock_irqsave(&devtree_lock, flags); |
fcdeb7fe | 1484 | np->sibling = np->parent->child; |
465aac6d | 1485 | np->allnext = of_allnodes; |
fcdeb7fe | 1486 | np->parent->child = np; |
465aac6d | 1487 | of_allnodes = np; |
d6d3c4e6 | 1488 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e81b3295 NF |
1489 | |
1490 | of_add_proc_dt_entry(np); | |
1cf3d8b3 | 1491 | return 0; |
fcdeb7fe GL |
1492 | } |
1493 | ||
e81b3295 NF |
1494 | #ifdef CONFIG_PROC_DEVICETREE |
1495 | static void of_remove_proc_dt_entry(struct device_node *dn) | |
1496 | { | |
a8ca16ea | 1497 | proc_remove(dn->pde); |
e81b3295 NF |
1498 | } |
1499 | #else | |
1500 | static void of_remove_proc_dt_entry(struct device_node *dn) | |
1501 | { | |
1502 | return; | |
1503 | } | |
1504 | #endif | |
1505 | ||
fcdeb7fe GL |
1506 | /** |
1507 | * of_detach_node - "Unplug" a node from the device tree. | |
1508 | * | |
1509 | * The caller must hold a reference to the node. The memory associated with | |
1510 | * the node is not freed until its refcount goes to zero. | |
1511 | */ | |
1cf3d8b3 | 1512 | int of_detach_node(struct device_node *np) |
fcdeb7fe GL |
1513 | { |
1514 | struct device_node *parent; | |
1515 | unsigned long flags; | |
1cf3d8b3 NF |
1516 | int rc = 0; |
1517 | ||
1518 | rc = of_reconfig_notify(OF_RECONFIG_DETACH_NODE, np); | |
1519 | if (rc) | |
1520 | return rc; | |
fcdeb7fe | 1521 | |
d6d3c4e6 | 1522 | raw_spin_lock_irqsave(&devtree_lock, flags); |
fcdeb7fe | 1523 | |
e81b3295 NF |
1524 | if (of_node_check_flag(np, OF_DETACHED)) { |
1525 | /* someone already detached it */ | |
d6d3c4e6 | 1526 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1cf3d8b3 | 1527 | return rc; |
e81b3295 NF |
1528 | } |
1529 | ||
fcdeb7fe | 1530 | parent = np->parent; |
e81b3295 | 1531 | if (!parent) { |
d6d3c4e6 | 1532 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1cf3d8b3 | 1533 | return rc; |
e81b3295 | 1534 | } |
fcdeb7fe | 1535 | |
465aac6d RD |
1536 | if (of_allnodes == np) |
1537 | of_allnodes = np->allnext; | |
fcdeb7fe GL |
1538 | else { |
1539 | struct device_node *prev; | |
465aac6d | 1540 | for (prev = of_allnodes; |
fcdeb7fe GL |
1541 | prev->allnext != np; |
1542 | prev = prev->allnext) | |
1543 | ; | |
1544 | prev->allnext = np->allnext; | |
1545 | } | |
1546 | ||
1547 | if (parent->child == np) | |
1548 | parent->child = np->sibling; | |
1549 | else { | |
1550 | struct device_node *prevsib; | |
1551 | for (prevsib = np->parent->child; | |
1552 | prevsib->sibling != np; | |
1553 | prevsib = prevsib->sibling) | |
1554 | ; | |
1555 | prevsib->sibling = np->sibling; | |
1556 | } | |
1557 | ||
1558 | of_node_set_flag(np, OF_DETACHED); | |
d6d3c4e6 | 1559 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e81b3295 NF |
1560 | |
1561 | of_remove_proc_dt_entry(np); | |
1cf3d8b3 | 1562 | return rc; |
fcdeb7fe GL |
1563 | } |
1564 | #endif /* defined(CONFIG_OF_DYNAMIC) */ | |
1565 | ||
611cad72 SG |
1566 | static void of_alias_add(struct alias_prop *ap, struct device_node *np, |
1567 | int id, const char *stem, int stem_len) | |
1568 | { | |
1569 | ap->np = np; | |
1570 | ap->id = id; | |
1571 | strncpy(ap->stem, stem, stem_len); | |
1572 | ap->stem[stem_len] = 0; | |
1573 | list_add_tail(&ap->link, &aliases_lookup); | |
1574 | pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n", | |
74a7f084 | 1575 | ap->alias, ap->stem, ap->id, of_node_full_name(np)); |
611cad72 SG |
1576 | } |
1577 | ||
1578 | /** | |
1579 | * of_alias_scan - Scan all properties of 'aliases' node | |
1580 | * | |
1581 | * The function scans all the properties of 'aliases' node and populate | |
1582 | * the the global lookup table with the properties. It returns the | |
1583 | * number of alias_prop found, or error code in error case. | |
1584 | * | |
1585 | * @dt_alloc: An allocator that provides a virtual address to memory | |
1586 | * for the resulting tree | |
1587 | */ | |
1588 | void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)) | |
1589 | { | |
1590 | struct property *pp; | |
1591 | ||
1592 | of_chosen = of_find_node_by_path("/chosen"); | |
1593 | if (of_chosen == NULL) | |
1594 | of_chosen = of_find_node_by_path("/chosen@0"); | |
1595 | of_aliases = of_find_node_by_path("/aliases"); | |
1596 | if (!of_aliases) | |
1597 | return; | |
1598 | ||
8af0da93 | 1599 | for_each_property_of_node(of_aliases, pp) { |
611cad72 SG |
1600 | const char *start = pp->name; |
1601 | const char *end = start + strlen(start); | |
1602 | struct device_node *np; | |
1603 | struct alias_prop *ap; | |
1604 | int id, len; | |
1605 | ||
1606 | /* Skip those we do not want to proceed */ | |
1607 | if (!strcmp(pp->name, "name") || | |
1608 | !strcmp(pp->name, "phandle") || | |
1609 | !strcmp(pp->name, "linux,phandle")) | |
1610 | continue; | |
1611 | ||
1612 | np = of_find_node_by_path(pp->value); | |
1613 | if (!np) | |
1614 | continue; | |
1615 | ||
1616 | /* walk the alias backwards to extract the id and work out | |
1617 | * the 'stem' string */ | |
1618 | while (isdigit(*(end-1)) && end > start) | |
1619 | end--; | |
1620 | len = end - start; | |
1621 | ||
1622 | if (kstrtoint(end, 10, &id) < 0) | |
1623 | continue; | |
1624 | ||
1625 | /* Allocate an alias_prop with enough space for the stem */ | |
1626 | ap = dt_alloc(sizeof(*ap) + len + 1, 4); | |
1627 | if (!ap) | |
1628 | continue; | |
1629 | ap->alias = start; | |
1630 | of_alias_add(ap, np, id, start, len); | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | /** | |
1635 | * of_alias_get_id - Get alias id for the given device_node | |
1636 | * @np: Pointer to the given device_node | |
1637 | * @stem: Alias stem of the given device_node | |
1638 | * | |
1639 | * The function travels the lookup table to get alias id for the given | |
1640 | * device_node and alias stem. It returns the alias id if find it. | |
1641 | */ | |
1642 | int of_alias_get_id(struct device_node *np, const char *stem) | |
1643 | { | |
1644 | struct alias_prop *app; | |
1645 | int id = -ENODEV; | |
1646 | ||
1647 | mutex_lock(&of_aliases_mutex); | |
1648 | list_for_each_entry(app, &aliases_lookup, link) { | |
1649 | if (strcmp(app->stem, stem) != 0) | |
1650 | continue; | |
1651 | ||
1652 | if (np == app->np) { | |
1653 | id = app->id; | |
1654 | break; | |
1655 | } | |
1656 | } | |
1657 | mutex_unlock(&of_aliases_mutex); | |
1658 | ||
1659 | return id; | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(of_alias_get_id); | |
c541adc6 SW |
1662 | |
1663 | const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, | |
1664 | u32 *pu) | |
1665 | { | |
1666 | const void *curv = cur; | |
1667 | ||
1668 | if (!prop) | |
1669 | return NULL; | |
1670 | ||
1671 | if (!cur) { | |
1672 | curv = prop->value; | |
1673 | goto out_val; | |
1674 | } | |
1675 | ||
1676 | curv += sizeof(*cur); | |
1677 | if (curv >= prop->value + prop->length) | |
1678 | return NULL; | |
1679 | ||
1680 | out_val: | |
1681 | *pu = be32_to_cpup(curv); | |
1682 | return curv; | |
1683 | } | |
1684 | EXPORT_SYMBOL_GPL(of_prop_next_u32); | |
1685 | ||
1686 | const char *of_prop_next_string(struct property *prop, const char *cur) | |
1687 | { | |
1688 | const void *curv = cur; | |
1689 | ||
1690 | if (!prop) | |
1691 | return NULL; | |
1692 | ||
1693 | if (!cur) | |
1694 | return prop->value; | |
1695 | ||
1696 | curv += strlen(cur) + 1; | |
1697 | if (curv >= prop->value + prop->length) | |
1698 | return NULL; | |
1699 | ||
1700 | return curv; | |
1701 | } | |
1702 | EXPORT_SYMBOL_GPL(of_prop_next_string); |