2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net
12 * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and
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.
20 #include <linux/ctype.h>
21 #include <linux/cpu.h>
22 #include <linux/module.h>
24 #include <linux/spinlock.h>
25 #include <linux/slab.h>
26 #include <linux/proc_fs.h>
28 #include "of_private.h"
30 LIST_HEAD(aliases_lookup
);
32 struct device_node
*of_allnodes
;
33 EXPORT_SYMBOL(of_allnodes
);
34 struct device_node
*of_chosen
;
35 struct device_node
*of_aliases
;
36 static struct device_node
*of_stdout
;
38 DEFINE_MUTEX(of_aliases_mutex
);
40 /* use when traversing tree through the allnext, child, sibling,
41 * or parent members of struct device_node.
43 DEFINE_RAW_SPINLOCK(devtree_lock
);
45 int of_n_addr_cells(struct device_node
*np
)
52 ip
= of_get_property(np
, "#address-cells", NULL
);
54 return be32_to_cpup(ip
);
56 /* No #address-cells property for the root node */
57 return OF_ROOT_NODE_ADDR_CELLS_DEFAULT
;
59 EXPORT_SYMBOL(of_n_addr_cells
);
61 int of_n_size_cells(struct device_node
*np
)
68 ip
= of_get_property(np
, "#size-cells", NULL
);
70 return be32_to_cpup(ip
);
72 /* No #size-cells property for the root node */
73 return OF_ROOT_NODE_SIZE_CELLS_DEFAULT
;
75 EXPORT_SYMBOL(of_n_size_cells
);
77 #if defined(CONFIG_OF_DYNAMIC)
79 * of_node_get - Increment refcount of a node
80 * @node: Node to inc refcount, NULL is supported to
81 * simplify writing of callers
85 struct device_node
*of_node_get(struct device_node
*node
)
88 kref_get(&node
->kref
);
91 EXPORT_SYMBOL(of_node_get
);
93 static inline struct device_node
*kref_to_device_node(struct kref
*kref
)
95 return container_of(kref
, struct device_node
, kref
);
99 * of_node_release - release a dynamically allocated node
100 * @kref: kref element of the node to be released
102 * In of_node_put() this function is passed to kref_put()
105 static void of_node_release(struct kref
*kref
)
107 struct device_node
*node
= kref_to_device_node(kref
);
108 struct property
*prop
= node
->properties
;
110 /* We should never be releasing nodes that haven't been detached. */
111 if (!of_node_check_flag(node
, OF_DETACHED
)) {
112 pr_err("ERROR: Bad of_node_put() on %s\n", node
->full_name
);
114 kref_init(&node
->kref
);
118 if (!of_node_check_flag(node
, OF_DYNAMIC
))
122 struct property
*next
= prop
->next
;
129 prop
= node
->deadprops
;
130 node
->deadprops
= NULL
;
133 kfree(node
->full_name
);
139 * of_node_put - Decrement refcount of a node
140 * @node: Node to dec refcount, NULL is supported to
141 * simplify writing of callers
144 void of_node_put(struct device_node
*node
)
147 kref_put(&node
->kref
, of_node_release
);
149 EXPORT_SYMBOL(of_node_put
);
150 #endif /* CONFIG_OF_DYNAMIC */
152 static struct property
*__of_find_property(const struct device_node
*np
,
153 const char *name
, int *lenp
)
160 for (pp
= np
->properties
; pp
; pp
= pp
->next
) {
161 if (of_prop_cmp(pp
->name
, name
) == 0) {
171 struct property
*of_find_property(const struct device_node
*np
,
178 raw_spin_lock_irqsave(&devtree_lock
, flags
);
179 pp
= __of_find_property(np
, name
, lenp
);
180 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
184 EXPORT_SYMBOL(of_find_property
);
187 * of_find_all_nodes - Get next node in global list
188 * @prev: Previous node or NULL to start iteration
189 * of_node_put() will be called on it
191 * Returns a node pointer with refcount incremented, use
192 * of_node_put() on it when done.
194 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
196 struct device_node
*np
;
199 raw_spin_lock_irqsave(&devtree_lock
, flags
);
200 np
= prev
? prev
->allnext
: of_allnodes
;
201 for (; np
!= NULL
; np
= np
->allnext
)
205 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
208 EXPORT_SYMBOL(of_find_all_nodes
);
211 * Find a property with a given name for a given node
212 * and return the value.
214 static const void *__of_get_property(const struct device_node
*np
,
215 const char *name
, int *lenp
)
217 struct property
*pp
= __of_find_property(np
, name
, lenp
);
219 return pp
? pp
->value
: NULL
;
223 * Find a property with a given name for a given node
224 * and return the value.
226 const void *of_get_property(const struct device_node
*np
, const char *name
,
229 struct property
*pp
= of_find_property(np
, name
, lenp
);
231 return pp
? pp
->value
: NULL
;
233 EXPORT_SYMBOL(of_get_property
);
236 * arch_match_cpu_phys_id - Match the given logical CPU and physical id
238 * @cpu: logical cpu index of a core/thread
239 * @phys_id: physical identifier of a core/thread
241 * CPU logical to physical index mapping is architecture specific.
242 * However this __weak function provides a default match of physical
243 * id to logical cpu index. phys_id provided here is usually values read
244 * from the device tree which must match the hardware internal registers.
246 * Returns true if the physical identifier and the logical cpu index
247 * correspond to the same core/thread, false otherwise.
249 bool __weak
arch_match_cpu_phys_id(int cpu
, u64 phys_id
)
251 return (u32
)phys_id
== cpu
;
255 * Checks if the given "prop_name" property holds the physical id of the
256 * core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not
257 * NULL, local thread number within the core is returned in it.
259 static bool __of_find_n_match_cpu_property(struct device_node
*cpun
,
260 const char *prop_name
, int cpu
, unsigned int *thread
)
263 int ac
, prop_len
, tid
;
266 ac
= of_n_addr_cells(cpun
);
267 cell
= of_get_property(cpun
, prop_name
, &prop_len
);
270 prop_len
/= sizeof(*cell
) * ac
;
271 for (tid
= 0; tid
< prop_len
; tid
++) {
272 hwid
= of_read_number(cell
, ac
);
273 if (arch_match_cpu_phys_id(cpu
, hwid
)) {
284 * arch_find_n_match_cpu_physical_id - See if the given device node is
285 * for the cpu corresponding to logical cpu 'cpu'. Return true if so,
286 * else false. If 'thread' is non-NULL, the local thread number within the
287 * core is returned in it.
289 bool __weak
arch_find_n_match_cpu_physical_id(struct device_node
*cpun
,
290 int cpu
, unsigned int *thread
)
292 /* Check for non-standard "ibm,ppc-interrupt-server#s" property
293 * for thread ids on PowerPC. If it doesn't exist fallback to
294 * standard "reg" property.
296 if (IS_ENABLED(CONFIG_PPC
) &&
297 __of_find_n_match_cpu_property(cpun
,
298 "ibm,ppc-interrupt-server#s",
302 if (__of_find_n_match_cpu_property(cpun
, "reg", cpu
, thread
))
309 * of_get_cpu_node - Get device node associated with the given logical CPU
311 * @cpu: CPU number(logical index) for which device node is required
312 * @thread: if not NULL, local thread number within the physical core is
315 * The main purpose of this function is to retrieve the device node for the
316 * given logical CPU index. It should be used to initialize the of_node in
317 * cpu device. Once of_node in cpu device is populated, all the further
318 * references can use that instead.
320 * CPU logical to physical index mapping is architecture specific and is built
321 * before booting secondary cores. This function uses arch_match_cpu_phys_id
322 * which can be overridden by architecture specific implementation.
324 * Returns a node pointer for the logical cpu if found, else NULL.
326 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
328 struct device_node
*cpun
;
330 for_each_node_by_type(cpun
, "cpu") {
331 if (arch_find_n_match_cpu_physical_id(cpun
, cpu
, thread
))
336 EXPORT_SYMBOL(of_get_cpu_node
);
338 /** Checks if the given "compat" string matches one of the strings in
339 * the device's "compatible" property
341 static int __of_device_is_compatible(const struct device_node
*device
,
347 cp
= __of_get_property(device
, "compatible", &cplen
);
351 if (of_compat_cmp(cp
, compat
, strlen(compat
)) == 0)
361 /** Checks if the given "compat" string matches one of the strings in
362 * the device's "compatible" property
364 int of_device_is_compatible(const struct device_node
*device
,
370 raw_spin_lock_irqsave(&devtree_lock
, flags
);
371 res
= __of_device_is_compatible(device
, compat
);
372 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
375 EXPORT_SYMBOL(of_device_is_compatible
);
378 * of_machine_is_compatible - Test root of device tree for a given compatible value
379 * @compat: compatible string to look for in root node's compatible property.
381 * Returns true if the root node has the given value in its
382 * compatible property.
384 int of_machine_is_compatible(const char *compat
)
386 struct device_node
*root
;
389 root
= of_find_node_by_path("/");
391 rc
= of_device_is_compatible(root
, compat
);
396 EXPORT_SYMBOL(of_machine_is_compatible
);
399 * __of_device_is_available - check if a device is available for use
401 * @device: Node to check for availability, with locks already held
403 * Returns 1 if the status property is absent or set to "okay" or "ok",
406 static int __of_device_is_available(const struct device_node
*device
)
411 status
= __of_get_property(device
, "status", &statlen
);
416 if (!strcmp(status
, "okay") || !strcmp(status
, "ok"))
424 * of_device_is_available - check if a device is available for use
426 * @device: Node to check for availability
428 * Returns 1 if the status property is absent or set to "okay" or "ok",
431 int of_device_is_available(const struct device_node
*device
)
436 raw_spin_lock_irqsave(&devtree_lock
, flags
);
437 res
= __of_device_is_available(device
);
438 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
442 EXPORT_SYMBOL(of_device_is_available
);
445 * of_get_parent - Get a node's parent if any
446 * @node: Node to get parent
448 * Returns a node pointer with refcount incremented, use
449 * of_node_put() on it when done.
451 struct device_node
*of_get_parent(const struct device_node
*node
)
453 struct device_node
*np
;
459 raw_spin_lock_irqsave(&devtree_lock
, flags
);
460 np
= of_node_get(node
->parent
);
461 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
464 EXPORT_SYMBOL(of_get_parent
);
467 * of_get_next_parent - Iterate to a node's parent
468 * @node: Node to get parent of
470 * This is like of_get_parent() except that it drops the
471 * refcount on the passed node, making it suitable for iterating
472 * through a node's parents.
474 * Returns a node pointer with refcount incremented, use
475 * of_node_put() on it when done.
477 struct device_node
*of_get_next_parent(struct device_node
*node
)
479 struct device_node
*parent
;
485 raw_spin_lock_irqsave(&devtree_lock
, flags
);
486 parent
= of_node_get(node
->parent
);
488 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
491 EXPORT_SYMBOL(of_get_next_parent
);
494 * of_get_next_child - Iterate a node childs
496 * @prev: previous child of the parent node, or NULL to get first
498 * Returns a node pointer with refcount incremented, use
499 * of_node_put() on it when done.
501 struct device_node
*of_get_next_child(const struct device_node
*node
,
502 struct device_node
*prev
)
504 struct device_node
*next
;
507 raw_spin_lock_irqsave(&devtree_lock
, flags
);
508 next
= prev
? prev
->sibling
: node
->child
;
509 for (; next
; next
= next
->sibling
)
510 if (of_node_get(next
))
513 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
516 EXPORT_SYMBOL(of_get_next_child
);
519 * of_get_next_available_child - Find the next available child node
521 * @prev: previous child of the parent node, or NULL to get first
523 * This function is like of_get_next_child(), except that it
524 * automatically skips any disabled nodes (i.e. status = "disabled").
526 struct device_node
*of_get_next_available_child(const struct device_node
*node
,
527 struct device_node
*prev
)
529 struct device_node
*next
;
532 raw_spin_lock_irqsave(&devtree_lock
, flags
);
533 next
= prev
? prev
->sibling
: node
->child
;
534 for (; next
; next
= next
->sibling
) {
535 if (!__of_device_is_available(next
))
537 if (of_node_get(next
))
541 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
544 EXPORT_SYMBOL(of_get_next_available_child
);
547 * of_get_child_by_name - Find the child node by name for a given parent
549 * @name: child name to look for.
551 * This function looks for child node for given matching name
553 * Returns a node pointer if found, with refcount incremented, use
554 * of_node_put() on it when done.
555 * Returns NULL if node is not found.
557 struct device_node
*of_get_child_by_name(const struct device_node
*node
,
560 struct device_node
*child
;
562 for_each_child_of_node(node
, child
)
563 if (child
->name
&& (of_node_cmp(child
->name
, name
) == 0))
567 EXPORT_SYMBOL(of_get_child_by_name
);
570 * of_find_node_by_path - Find a node matching a full OF path
571 * @path: The full path to match
573 * Returns a node pointer with refcount incremented, use
574 * of_node_put() on it when done.
576 struct device_node
*of_find_node_by_path(const char *path
)
578 struct device_node
*np
= of_allnodes
;
581 raw_spin_lock_irqsave(&devtree_lock
, flags
);
582 for (; np
; np
= np
->allnext
) {
583 if (np
->full_name
&& (of_node_cmp(np
->full_name
, path
) == 0)
587 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
590 EXPORT_SYMBOL(of_find_node_by_path
);
593 * of_find_node_by_name - Find a node by its "name" property
594 * @from: The node to start searching from or NULL, the node
595 * you pass will not be searched, only the next one
596 * will; typically, you pass what the previous call
597 * returned. of_node_put() will be called on it
598 * @name: The name string to match against
600 * Returns a node pointer with refcount incremented, use
601 * of_node_put() on it when done.
603 struct device_node
*of_find_node_by_name(struct device_node
*from
,
606 struct device_node
*np
;
609 raw_spin_lock_irqsave(&devtree_lock
, flags
);
610 np
= from
? from
->allnext
: of_allnodes
;
611 for (; np
; np
= np
->allnext
)
612 if (np
->name
&& (of_node_cmp(np
->name
, name
) == 0)
616 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
619 EXPORT_SYMBOL(of_find_node_by_name
);
622 * of_find_node_by_type - Find a node by its "device_type" property
623 * @from: The node to start searching from, or NULL to start searching
624 * the entire device tree. The node you pass will not be
625 * searched, only the next one will; typically, you pass
626 * what the previous call returned. of_node_put() will be
627 * called on from for you.
628 * @type: The type string to match against
630 * Returns a node pointer with refcount incremented, use
631 * of_node_put() on it when done.
633 struct device_node
*of_find_node_by_type(struct device_node
*from
,
636 struct device_node
*np
;
639 raw_spin_lock_irqsave(&devtree_lock
, flags
);
640 np
= from
? from
->allnext
: of_allnodes
;
641 for (; np
; np
= np
->allnext
)
642 if (np
->type
&& (of_node_cmp(np
->type
, type
) == 0)
646 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
649 EXPORT_SYMBOL(of_find_node_by_type
);
652 * of_find_compatible_node - Find a node based on type and one of the
653 * tokens in its "compatible" property
654 * @from: The node to start searching from or NULL, the node
655 * you pass will not be searched, only the next one
656 * will; typically, you pass what the previous call
657 * returned. of_node_put() will be called on it
658 * @type: The type string to match "device_type" or NULL to ignore
659 * @compatible: The string to match to one of the tokens in the device
662 * Returns a node pointer with refcount incremented, use
663 * of_node_put() on it when done.
665 struct device_node
*of_find_compatible_node(struct device_node
*from
,
666 const char *type
, const char *compatible
)
668 struct device_node
*np
;
671 raw_spin_lock_irqsave(&devtree_lock
, flags
);
672 np
= from
? from
->allnext
: of_allnodes
;
673 for (; np
; np
= np
->allnext
) {
675 && !(np
->type
&& (of_node_cmp(np
->type
, type
) == 0)))
677 if (__of_device_is_compatible(np
, compatible
) &&
682 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
685 EXPORT_SYMBOL(of_find_compatible_node
);
688 * of_find_node_with_property - Find a node which has a property with
690 * @from: The node to start searching from or NULL, the node
691 * you pass will not be searched, only the next one
692 * will; typically, you pass what the previous call
693 * returned. of_node_put() will be called on it
694 * @prop_name: The name of the property to look for.
696 * Returns a node pointer with refcount incremented, use
697 * of_node_put() on it when done.
699 struct device_node
*of_find_node_with_property(struct device_node
*from
,
700 const char *prop_name
)
702 struct device_node
*np
;
706 raw_spin_lock_irqsave(&devtree_lock
, flags
);
707 np
= from
? from
->allnext
: of_allnodes
;
708 for (; np
; np
= np
->allnext
) {
709 for (pp
= np
->properties
; pp
; pp
= pp
->next
) {
710 if (of_prop_cmp(pp
->name
, prop_name
) == 0) {
718 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
721 EXPORT_SYMBOL(of_find_node_with_property
);
724 const struct of_device_id
*__of_match_node(const struct of_device_id
*matches
,
725 const struct device_node
*node
)
730 while (matches
->name
[0] || matches
->type
[0] || matches
->compatible
[0]) {
732 if (matches
->name
[0])
734 && !strcmp(matches
->name
, node
->name
);
735 if (matches
->type
[0])
737 && !strcmp(matches
->type
, node
->type
);
738 if (matches
->compatible
[0])
739 match
&= __of_device_is_compatible(node
,
740 matches
->compatible
);
749 * of_match_node - Tell if an device_node has a matching of_match structure
750 * @matches: array of of device match structures to search in
751 * @node: the of device structure to match against
753 * Low level utility function used by device matching.
755 const struct of_device_id
*of_match_node(const struct of_device_id
*matches
,
756 const struct device_node
*node
)
758 const struct of_device_id
*match
;
761 raw_spin_lock_irqsave(&devtree_lock
, flags
);
762 match
= __of_match_node(matches
, node
);
763 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
766 EXPORT_SYMBOL(of_match_node
);
769 * of_find_matching_node_and_match - Find a node based on an of_device_id
771 * @from: The node to start searching from or NULL, the node
772 * you pass will not be searched, only the next one
773 * will; typically, you pass what the previous call
774 * returned. of_node_put() will be called on it
775 * @matches: array of of device match structures to search in
776 * @match Updated to point at the matches entry which matched
778 * Returns a node pointer with refcount incremented, use
779 * of_node_put() on it when done.
781 struct device_node
*of_find_matching_node_and_match(struct device_node
*from
,
782 const struct of_device_id
*matches
,
783 const struct of_device_id
**match
)
785 struct device_node
*np
;
786 const struct of_device_id
*m
;
792 raw_spin_lock_irqsave(&devtree_lock
, flags
);
793 np
= from
? from
->allnext
: of_allnodes
;
794 for (; np
; np
= np
->allnext
) {
795 m
= __of_match_node(matches
, np
);
796 if (m
&& of_node_get(np
)) {
803 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
806 EXPORT_SYMBOL(of_find_matching_node_and_match
);
809 * of_modalias_node - Lookup appropriate modalias for a device node
810 * @node: pointer to a device tree node
811 * @modalias: Pointer to buffer that modalias value will be copied into
812 * @len: Length of modalias value
814 * Based on the value of the compatible property, this routine will attempt
815 * to choose an appropriate modalias value for a particular device tree node.
816 * It does this by stripping the manufacturer prefix (as delimited by a ',')
817 * from the first entry in the compatible list property.
819 * This routine returns 0 on success, <0 on failure.
821 int of_modalias_node(struct device_node
*node
, char *modalias
, int len
)
823 const char *compatible
, *p
;
826 compatible
= of_get_property(node
, "compatible", &cplen
);
827 if (!compatible
|| strlen(compatible
) > cplen
)
829 p
= strchr(compatible
, ',');
830 strlcpy(modalias
, p
? p
+ 1 : compatible
, len
);
833 EXPORT_SYMBOL_GPL(of_modalias_node
);
836 * of_find_node_by_phandle - Find a node given a phandle
837 * @handle: phandle of the node to find
839 * Returns a node pointer with refcount incremented, use
840 * of_node_put() on it when done.
842 struct device_node
*of_find_node_by_phandle(phandle handle
)
844 struct device_node
*np
;
847 raw_spin_lock_irqsave(&devtree_lock
, flags
);
848 for (np
= of_allnodes
; np
; np
= np
->allnext
)
849 if (np
->phandle
== handle
)
852 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
855 EXPORT_SYMBOL(of_find_node_by_phandle
);
858 * of_find_property_value_of_size
860 * @np: device node from which the property value is to be read.
861 * @propname: name of the property to be searched.
862 * @len: requested length of property value
864 * Search for a property in a device node and valid the requested size.
865 * Returns the property value on success, -EINVAL if the property does not
866 * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
867 * property data isn't large enough.
870 static void *of_find_property_value_of_size(const struct device_node
*np
,
871 const char *propname
, u32 len
)
873 struct property
*prop
= of_find_property(np
, propname
, NULL
);
876 return ERR_PTR(-EINVAL
);
878 return ERR_PTR(-ENODATA
);
879 if (len
> prop
->length
)
880 return ERR_PTR(-EOVERFLOW
);
886 * of_property_read_u32_index - Find and read a u32 from a multi-value property.
888 * @np: device node from which the property value is to be read.
889 * @propname: name of the property to be searched.
890 * @index: index of the u32 in the list of values
891 * @out_value: pointer to return value, modified only if no error.
893 * Search for a property in a device node and read nth 32-bit value from
894 * it. Returns 0 on success, -EINVAL if the property does not exist,
895 * -ENODATA if property does not have a value, and -EOVERFLOW if the
896 * property data isn't large enough.
898 * The out_value is modified only if a valid u32 value can be decoded.
900 int of_property_read_u32_index(const struct device_node
*np
,
901 const char *propname
,
902 u32 index
, u32
*out_value
)
904 const u32
*val
= of_find_property_value_of_size(np
, propname
,
905 ((index
+ 1) * sizeof(*out_value
)));
910 *out_value
= be32_to_cpup(((__be32
*)val
) + index
);
913 EXPORT_SYMBOL_GPL(of_property_read_u32_index
);
916 * of_property_read_u8_array - Find and read an array of u8 from a property.
918 * @np: device node from which the property value is to be read.
919 * @propname: name of the property to be searched.
920 * @out_values: pointer to return value, modified only if return value is 0.
921 * @sz: number of array elements to read
923 * Search for a property in a device node and read 8-bit value(s) from
924 * it. Returns 0 on success, -EINVAL if the property does not exist,
925 * -ENODATA if property does not have a value, and -EOVERFLOW if the
926 * property data isn't large enough.
928 * dts entry of array should be like:
929 * property = /bits/ 8 <0x50 0x60 0x70>;
931 * The out_values is modified only if a valid u8 value can be decoded.
933 int of_property_read_u8_array(const struct device_node
*np
,
934 const char *propname
, u8
*out_values
, size_t sz
)
936 const u8
*val
= of_find_property_value_of_size(np
, propname
,
937 (sz
* sizeof(*out_values
)));
943 *out_values
++ = *val
++;
946 EXPORT_SYMBOL_GPL(of_property_read_u8_array
);
949 * of_property_read_u16_array - Find and read an array of u16 from a property.
951 * @np: device node from which the property value is to be read.
952 * @propname: name of the property to be searched.
953 * @out_values: pointer to return value, modified only if return value is 0.
954 * @sz: number of array elements to read
956 * Search for a property in a device node and read 16-bit value(s) from
957 * it. Returns 0 on success, -EINVAL if the property does not exist,
958 * -ENODATA if property does not have a value, and -EOVERFLOW if the
959 * property data isn't large enough.
961 * dts entry of array should be like:
962 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
964 * The out_values is modified only if a valid u16 value can be decoded.
966 int of_property_read_u16_array(const struct device_node
*np
,
967 const char *propname
, u16
*out_values
, size_t sz
)
969 const __be16
*val
= of_find_property_value_of_size(np
, propname
,
970 (sz
* sizeof(*out_values
)));
976 *out_values
++ = be16_to_cpup(val
++);
979 EXPORT_SYMBOL_GPL(of_property_read_u16_array
);
982 * of_property_read_u32_array - Find and read an array of 32 bit integers
985 * @np: device node from which the property value is to be read.
986 * @propname: name of the property to be searched.
987 * @out_values: pointer to return value, modified only if return value is 0.
988 * @sz: number of array elements to read
990 * Search for a property in a device node and read 32-bit value(s) from
991 * it. Returns 0 on success, -EINVAL if the property does not exist,
992 * -ENODATA if property does not have a value, and -EOVERFLOW if the
993 * property data isn't large enough.
995 * The out_values is modified only if a valid u32 value can be decoded.
997 int of_property_read_u32_array(const struct device_node
*np
,
998 const char *propname
, u32
*out_values
,
1001 const __be32
*val
= of_find_property_value_of_size(np
, propname
,
1002 (sz
* sizeof(*out_values
)));
1005 return PTR_ERR(val
);
1008 *out_values
++ = be32_to_cpup(val
++);
1011 EXPORT_SYMBOL_GPL(of_property_read_u32_array
);
1014 * of_property_read_u64 - Find and read a 64 bit integer from a property
1015 * @np: device node from which the property value is to be read.
1016 * @propname: name of the property to be searched.
1017 * @out_value: pointer to return value, modified only if return value is 0.
1019 * Search for a property in a device node and read a 64-bit value from
1020 * it. Returns 0 on success, -EINVAL if the property does not exist,
1021 * -ENODATA if property does not have a value, and -EOVERFLOW if the
1022 * property data isn't large enough.
1024 * The out_value is modified only if a valid u64 value can be decoded.
1026 int of_property_read_u64(const struct device_node
*np
, const char *propname
,
1029 const __be32
*val
= of_find_property_value_of_size(np
, propname
,
1030 sizeof(*out_value
));
1033 return PTR_ERR(val
);
1035 *out_value
= of_read_number(val
, 2);
1038 EXPORT_SYMBOL_GPL(of_property_read_u64
);
1041 * of_property_read_string - Find and read a string from a property
1042 * @np: device node from which the property value is to be read.
1043 * @propname: name of the property to be searched.
1044 * @out_string: pointer to null terminated return string, modified only if
1045 * return value is 0.
1047 * Search for a property in a device tree node and retrieve a null
1048 * terminated string value (pointer to data, not a copy). Returns 0 on
1049 * success, -EINVAL if the property does not exist, -ENODATA if property
1050 * does not have a value, and -EILSEQ if the string is not null-terminated
1051 * within the length of the property data.
1053 * The out_string pointer is modified only if a valid string can be decoded.
1055 int of_property_read_string(struct device_node
*np
, const char *propname
,
1056 const char **out_string
)
1058 struct property
*prop
= of_find_property(np
, propname
, NULL
);
1063 if (strnlen(prop
->value
, prop
->length
) >= prop
->length
)
1065 *out_string
= prop
->value
;
1068 EXPORT_SYMBOL_GPL(of_property_read_string
);
1071 * of_property_read_string_index - Find and read a string from a multiple
1073 * @np: device node from which the property value is to be read.
1074 * @propname: name of the property to be searched.
1075 * @index: index of the string in the list of strings
1076 * @out_string: pointer to null terminated return string, modified only if
1077 * return value is 0.
1079 * Search for a property in a device tree node and retrieve a null
1080 * terminated string value (pointer to data, not a copy) in the list of strings
1081 * contained in that property.
1082 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1083 * property does not have a value, and -EILSEQ if the string is not
1084 * null-terminated within the length of the property data.
1086 * The out_string pointer is modified only if a valid string can be decoded.
1088 int of_property_read_string_index(struct device_node
*np
, const char *propname
,
1089 int index
, const char **output
)
1091 struct property
*prop
= of_find_property(np
, propname
, NULL
);
1093 size_t l
= 0, total
= 0;
1100 if (strnlen(prop
->value
, prop
->length
) >= prop
->length
)
1105 for (i
= 0; total
< prop
->length
; total
+= l
, p
+= l
) {
1114 EXPORT_SYMBOL_GPL(of_property_read_string_index
);
1117 * of_property_match_string() - Find string in a list and return index
1118 * @np: pointer to node containing string list property
1119 * @propname: string list property name
1120 * @string: pointer to string to search for in string list
1122 * This function searches a string list property and returns the index
1123 * of a specific string value.
1125 int of_property_match_string(struct device_node
*np
, const char *propname
,
1128 struct property
*prop
= of_find_property(np
, propname
, NULL
);
1131 const char *p
, *end
;
1139 end
= p
+ prop
->length
;
1141 for (i
= 0; p
< end
; i
++, p
+= l
) {
1145 pr_debug("comparing %s with %s\n", string
, p
);
1146 if (strcmp(string
, p
) == 0)
1147 return i
; /* Found it; return index */
1151 EXPORT_SYMBOL_GPL(of_property_match_string
);
1154 * of_property_count_strings - Find and return the number of strings from a
1155 * multiple strings property.
1156 * @np: device node from which the property value is to be read.
1157 * @propname: name of the property to be searched.
1159 * Search for a property in a device tree node and retrieve the number of null
1160 * terminated string contain in it. Returns the number of strings on
1161 * success, -EINVAL if the property does not exist, -ENODATA if property
1162 * does not have a value, and -EILSEQ if the string is not null-terminated
1163 * within the length of the property data.
1165 int of_property_count_strings(struct device_node
*np
, const char *propname
)
1167 struct property
*prop
= of_find_property(np
, propname
, NULL
);
1169 size_t l
= 0, total
= 0;
1176 if (strnlen(prop
->value
, prop
->length
) >= prop
->length
)
1181 for (i
= 0; total
< prop
->length
; total
+= l
, p
+= l
, i
++)
1186 EXPORT_SYMBOL_GPL(of_property_count_strings
);
1188 void of_print_phandle_args(const char *msg
, const struct of_phandle_args
*args
)
1191 printk("%s %s", msg
, of_node_full_name(args
->np
));
1192 for (i
= 0; i
< args
->args_count
; i
++)
1193 printk(i
? ",%08x" : ":%08x", args
->args
[i
]);
1197 static int __of_parse_phandle_with_args(const struct device_node
*np
,
1198 const char *list_name
,
1199 const char *cells_name
,
1200 int cell_count
, int index
,
1201 struct of_phandle_args
*out_args
)
1203 const __be32
*list
, *list_end
;
1204 int rc
= 0, size
, cur_index
= 0;
1206 struct device_node
*node
= NULL
;
1209 /* Retrieve the phandle list property */
1210 list
= of_get_property(np
, list_name
, &size
);
1213 list_end
= list
+ size
/ sizeof(*list
);
1215 /* Loop over the phandles until all the requested entry is found */
1216 while (list
< list_end
) {
1221 * If phandle is 0, then it is an empty entry with no
1222 * arguments. Skip forward to the next entry.
1224 phandle
= be32_to_cpup(list
++);
1227 * Find the provider node and parse the #*-cells
1228 * property to determine the argument length.
1230 * This is not needed if the cell count is hard-coded
1231 * (i.e. cells_name not set, but cell_count is set),
1232 * except when we're going to return the found node
1235 if (cells_name
|| cur_index
== index
) {
1236 node
= of_find_node_by_phandle(phandle
);
1238 pr_err("%s: could not find phandle\n",
1245 if (of_property_read_u32(node
, cells_name
,
1247 pr_err("%s: could not get %s for %s\n",
1248 np
->full_name
, cells_name
,
1257 * Make sure that the arguments actually fit in the
1258 * remaining property data length
1260 if (list
+ count
> list_end
) {
1261 pr_err("%s: arguments longer than property\n",
1268 * All of the error cases above bail out of the loop, so at
1269 * this point, the parsing is successful. If the requested
1270 * index matches, then fill the out_args structure and return,
1271 * or return -ENOENT for an empty entry.
1274 if (cur_index
== index
) {
1280 if (WARN_ON(count
> MAX_PHANDLE_ARGS
))
1281 count
= MAX_PHANDLE_ARGS
;
1282 out_args
->np
= node
;
1283 out_args
->args_count
= count
;
1284 for (i
= 0; i
< count
; i
++)
1285 out_args
->args
[i
] = be32_to_cpup(list
++);
1290 /* Found it! return success */
1301 * Unlock node before returning result; will be one of:
1302 * -ENOENT : index is for empty phandle
1303 * -EINVAL : parsing error on data
1304 * [1..n] : Number of phandle (count mode; when index = -1)
1306 rc
= index
< 0 ? cur_index
: -ENOENT
;
1314 * of_parse_phandle - Resolve a phandle property to a device_node pointer
1315 * @np: Pointer to device node holding phandle property
1316 * @phandle_name: Name of property holding a phandle value
1317 * @index: For properties holding a table of phandles, this is the index into
1320 * Returns the device_node pointer with refcount incremented. Use
1321 * of_node_put() on it when done.
1323 struct device_node
*of_parse_phandle(const struct device_node
*np
,
1324 const char *phandle_name
, int index
)
1326 struct of_phandle_args args
;
1331 if (__of_parse_phandle_with_args(np
, phandle_name
, NULL
, 0,
1337 EXPORT_SYMBOL(of_parse_phandle
);
1340 * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
1341 * @np: pointer to a device tree node containing a list
1342 * @list_name: property name that contains a list
1343 * @cells_name: property name that specifies phandles' arguments count
1344 * @index: index of a phandle to parse out
1345 * @out_args: optional pointer to output arguments structure (will be filled)
1347 * This function is useful to parse lists of phandles and their arguments.
1348 * Returns 0 on success and fills out_args, on error returns appropriate
1351 * Caller is responsible to call of_node_put() on the returned out_args->node
1357 * #list-cells = <2>;
1361 * #list-cells = <1>;
1365 * list = <&phandle1 1 2 &phandle2 3>;
1368 * To get a device_node of the `node2' node you may call this:
1369 * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
1371 int of_parse_phandle_with_args(const struct device_node
*np
, const char *list_name
,
1372 const char *cells_name
, int index
,
1373 struct of_phandle_args
*out_args
)
1377 return __of_parse_phandle_with_args(np
, list_name
, cells_name
, 0,
1380 EXPORT_SYMBOL(of_parse_phandle_with_args
);
1383 * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a list
1384 * @np: pointer to a device tree node containing a list
1385 * @list_name: property name that contains a list
1386 * @cell_count: number of argument cells following the phandle
1387 * @index: index of a phandle to parse out
1388 * @out_args: optional pointer to output arguments structure (will be filled)
1390 * This function is useful to parse lists of phandles and their arguments.
1391 * Returns 0 on success and fills out_args, on error returns appropriate
1394 * Caller is responsible to call of_node_put() on the returned out_args->node
1406 * list = <&phandle1 0 2 &phandle2 2 3>;
1409 * To get a device_node of the `node2' node you may call this:
1410 * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args);
1412 int of_parse_phandle_with_fixed_args(const struct device_node
*np
,
1413 const char *list_name
, int cell_count
,
1414 int index
, struct of_phandle_args
*out_args
)
1418 return __of_parse_phandle_with_args(np
, list_name
, NULL
, cell_count
,
1421 EXPORT_SYMBOL(of_parse_phandle_with_fixed_args
);
1424 * of_count_phandle_with_args() - Find the number of phandles references in a property
1425 * @np: pointer to a device tree node containing a list
1426 * @list_name: property name that contains a list
1427 * @cells_name: property name that specifies phandles' arguments count
1429 * Returns the number of phandle + argument tuples within a property. It
1430 * is a typical pattern to encode a list of phandle and variable
1431 * arguments into a single property. The number of arguments is encoded
1432 * by a property in the phandle-target node. For example, a gpios
1433 * property would contain a list of GPIO specifies consisting of a
1434 * phandle and 1 or more arguments. The number of arguments are
1435 * determined by the #gpio-cells property in the node pointed to by the
1438 int of_count_phandle_with_args(const struct device_node
*np
, const char *list_name
,
1439 const char *cells_name
)
1441 return __of_parse_phandle_with_args(np
, list_name
, cells_name
, 0, -1,
1444 EXPORT_SYMBOL(of_count_phandle_with_args
);
1446 #if defined(CONFIG_OF_DYNAMIC)
1447 static int of_property_notify(int action
, struct device_node
*np
,
1448 struct property
*prop
)
1450 struct of_prop_reconfig pr
;
1454 return of_reconfig_notify(action
, &pr
);
1457 static int of_property_notify(int action
, struct device_node
*np
,
1458 struct property
*prop
)
1465 * of_add_property - Add a property to a node
1467 int of_add_property(struct device_node
*np
, struct property
*prop
)
1469 struct property
**next
;
1470 unsigned long flags
;
1473 rc
= of_property_notify(OF_RECONFIG_ADD_PROPERTY
, np
, prop
);
1478 raw_spin_lock_irqsave(&devtree_lock
, flags
);
1479 next
= &np
->properties
;
1481 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1482 /* duplicate ! don't insert it */
1483 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1486 next
= &(*next
)->next
;
1489 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1491 #ifdef CONFIG_PROC_DEVICETREE
1492 /* try to add to proc as well if it was initialized */
1494 proc_device_tree_add_prop(np
->pde
, prop
);
1495 #endif /* CONFIG_PROC_DEVICETREE */
1501 * of_remove_property - Remove a property from a node.
1503 * Note that we don't actually remove it, since we have given out
1504 * who-knows-how-many pointers to the data using get-property.
1505 * Instead we just move the property to the "dead properties"
1506 * list, so it won't be found any more.
1508 int of_remove_property(struct device_node
*np
, struct property
*prop
)
1510 struct property
**next
;
1511 unsigned long flags
;
1515 rc
= of_property_notify(OF_RECONFIG_REMOVE_PROPERTY
, np
, prop
);
1519 raw_spin_lock_irqsave(&devtree_lock
, flags
);
1520 next
= &np
->properties
;
1522 if (*next
== prop
) {
1523 /* found the node */
1525 prop
->next
= np
->deadprops
;
1526 np
->deadprops
= prop
;
1530 next
= &(*next
)->next
;
1532 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1537 #ifdef CONFIG_PROC_DEVICETREE
1538 /* try to remove the proc node as well */
1540 proc_device_tree_remove_prop(np
->pde
, prop
);
1541 #endif /* CONFIG_PROC_DEVICETREE */
1547 * of_update_property - Update a property in a node, if the property does
1548 * not exist, add it.
1550 * Note that we don't actually remove it, since we have given out
1551 * who-knows-how-many pointers to the data using get-property.
1552 * Instead we just move the property to the "dead properties" list,
1553 * and add the new property to the property list
1555 int of_update_property(struct device_node
*np
, struct property
*newprop
)
1557 struct property
**next
, *oldprop
;
1558 unsigned long flags
;
1561 rc
= of_property_notify(OF_RECONFIG_UPDATE_PROPERTY
, np
, newprop
);
1568 oldprop
= of_find_property(np
, newprop
->name
, NULL
);
1570 return of_add_property(np
, newprop
);
1572 raw_spin_lock_irqsave(&devtree_lock
, flags
);
1573 next
= &np
->properties
;
1575 if (*next
== oldprop
) {
1576 /* found the node */
1577 newprop
->next
= oldprop
->next
;
1579 oldprop
->next
= np
->deadprops
;
1580 np
->deadprops
= oldprop
;
1584 next
= &(*next
)->next
;
1586 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1591 #ifdef CONFIG_PROC_DEVICETREE
1592 /* try to add to proc as well if it was initialized */
1594 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1595 #endif /* CONFIG_PROC_DEVICETREE */
1600 #if defined(CONFIG_OF_DYNAMIC)
1602 * Support for dynamic device trees.
1604 * On some platforms, the device tree can be manipulated at runtime.
1605 * The routines in this section support adding, removing and changing
1606 * device tree nodes.
1609 static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain
);
1611 int of_reconfig_notifier_register(struct notifier_block
*nb
)
1613 return blocking_notifier_chain_register(&of_reconfig_chain
, nb
);
1615 EXPORT_SYMBOL_GPL(of_reconfig_notifier_register
);
1617 int of_reconfig_notifier_unregister(struct notifier_block
*nb
)
1619 return blocking_notifier_chain_unregister(&of_reconfig_chain
, nb
);
1621 EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister
);
1623 int of_reconfig_notify(unsigned long action
, void *p
)
1627 rc
= blocking_notifier_call_chain(&of_reconfig_chain
, action
, p
);
1628 return notifier_to_errno(rc
);
1631 #ifdef CONFIG_PROC_DEVICETREE
1632 static void of_add_proc_dt_entry(struct device_node
*dn
)
1634 struct proc_dir_entry
*ent
;
1636 ent
= proc_mkdir(strrchr(dn
->full_name
, '/') + 1, dn
->parent
->pde
);
1638 proc_device_tree_add_node(dn
, ent
);
1641 static void of_add_proc_dt_entry(struct device_node
*dn
)
1648 * of_attach_node - Plug a device node into the tree and global list.
1650 int of_attach_node(struct device_node
*np
)
1652 unsigned long flags
;
1655 rc
= of_reconfig_notify(OF_RECONFIG_ATTACH_NODE
, np
);
1659 raw_spin_lock_irqsave(&devtree_lock
, flags
);
1660 np
->sibling
= np
->parent
->child
;
1661 np
->allnext
= of_allnodes
;
1662 np
->parent
->child
= np
;
1664 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1666 of_add_proc_dt_entry(np
);
1670 #ifdef CONFIG_PROC_DEVICETREE
1671 static void of_remove_proc_dt_entry(struct device_node
*dn
)
1673 proc_remove(dn
->pde
);
1676 static void of_remove_proc_dt_entry(struct device_node
*dn
)
1683 * of_detach_node - "Unplug" a node from the device tree.
1685 * The caller must hold a reference to the node. The memory associated with
1686 * the node is not freed until its refcount goes to zero.
1688 int of_detach_node(struct device_node
*np
)
1690 struct device_node
*parent
;
1691 unsigned long flags
;
1694 rc
= of_reconfig_notify(OF_RECONFIG_DETACH_NODE
, np
);
1698 raw_spin_lock_irqsave(&devtree_lock
, flags
);
1700 if (of_node_check_flag(np
, OF_DETACHED
)) {
1701 /* someone already detached it */
1702 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1706 parent
= np
->parent
;
1708 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1712 if (of_allnodes
== np
)
1713 of_allnodes
= np
->allnext
;
1715 struct device_node
*prev
;
1716 for (prev
= of_allnodes
;
1717 prev
->allnext
!= np
;
1718 prev
= prev
->allnext
)
1720 prev
->allnext
= np
->allnext
;
1723 if (parent
->child
== np
)
1724 parent
->child
= np
->sibling
;
1726 struct device_node
*prevsib
;
1727 for (prevsib
= np
->parent
->child
;
1728 prevsib
->sibling
!= np
;
1729 prevsib
= prevsib
->sibling
)
1731 prevsib
->sibling
= np
->sibling
;
1734 of_node_set_flag(np
, OF_DETACHED
);
1735 raw_spin_unlock_irqrestore(&devtree_lock
, flags
);
1737 of_remove_proc_dt_entry(np
);
1740 #endif /* defined(CONFIG_OF_DYNAMIC) */
1742 static void of_alias_add(struct alias_prop
*ap
, struct device_node
*np
,
1743 int id
, const char *stem
, int stem_len
)
1747 strncpy(ap
->stem
, stem
, stem_len
);
1748 ap
->stem
[stem_len
] = 0;
1749 list_add_tail(&ap
->link
, &aliases_lookup
);
1750 pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
1751 ap
->alias
, ap
->stem
, ap
->id
, of_node_full_name(np
));
1755 * of_alias_scan - Scan all properties of 'aliases' node
1757 * The function scans all the properties of 'aliases' node and populate
1758 * the the global lookup table with the properties. It returns the
1759 * number of alias_prop found, or error code in error case.
1761 * @dt_alloc: An allocator that provides a virtual address to memory
1762 * for the resulting tree
1764 void of_alias_scan(void * (*dt_alloc
)(u64 size
, u64 align
))
1766 struct property
*pp
;
1768 of_chosen
= of_find_node_by_path("/chosen");
1769 if (of_chosen
== NULL
)
1770 of_chosen
= of_find_node_by_path("/chosen@0");
1775 name
= of_get_property(of_chosen
, "linux,stdout-path", NULL
);
1777 of_stdout
= of_find_node_by_path(name
);
1780 of_aliases
= of_find_node_by_path("/aliases");
1784 for_each_property_of_node(of_aliases
, pp
) {
1785 const char *start
= pp
->name
;
1786 const char *end
= start
+ strlen(start
);
1787 struct device_node
*np
;
1788 struct alias_prop
*ap
;
1791 /* Skip those we do not want to proceed */
1792 if (!strcmp(pp
->name
, "name") ||
1793 !strcmp(pp
->name
, "phandle") ||
1794 !strcmp(pp
->name
, "linux,phandle"))
1797 np
= of_find_node_by_path(pp
->value
);
1801 /* walk the alias backwards to extract the id and work out
1802 * the 'stem' string */
1803 while (isdigit(*(end
-1)) && end
> start
)
1807 if (kstrtoint(end
, 10, &id
) < 0)
1810 /* Allocate an alias_prop with enough space for the stem */
1811 ap
= dt_alloc(sizeof(*ap
) + len
+ 1, 4);
1814 memset(ap
, 0, sizeof(*ap
) + len
+ 1);
1816 of_alias_add(ap
, np
, id
, start
, len
);
1821 * of_alias_get_id - Get alias id for the given device_node
1822 * @np: Pointer to the given device_node
1823 * @stem: Alias stem of the given device_node
1825 * The function travels the lookup table to get alias id for the given
1826 * device_node and alias stem. It returns the alias id if find it.
1828 int of_alias_get_id(struct device_node
*np
, const char *stem
)
1830 struct alias_prop
*app
;
1833 mutex_lock(&of_aliases_mutex
);
1834 list_for_each_entry(app
, &aliases_lookup
, link
) {
1835 if (strcmp(app
->stem
, stem
) != 0)
1838 if (np
== app
->np
) {
1843 mutex_unlock(&of_aliases_mutex
);
1847 EXPORT_SYMBOL_GPL(of_alias_get_id
);
1849 const __be32
*of_prop_next_u32(struct property
*prop
, const __be32
*cur
,
1852 const void *curv
= cur
;
1862 curv
+= sizeof(*cur
);
1863 if (curv
>= prop
->value
+ prop
->length
)
1867 *pu
= be32_to_cpup(curv
);
1870 EXPORT_SYMBOL_GPL(of_prop_next_u32
);
1872 const char *of_prop_next_string(struct property
*prop
, const char *cur
)
1874 const void *curv
= cur
;
1882 curv
+= strlen(cur
) + 1;
1883 if (curv
>= prop
->value
+ prop
->length
)
1888 EXPORT_SYMBOL_GPL(of_prop_next_string
);
1891 * of_device_is_stdout_path - check if a device node matches the
1892 * linux,stdout-path property
1894 * Check if this device node matches the linux,stdout-path property
1895 * in the chosen node. return true if yes, false otherwise.
1897 int of_device_is_stdout_path(struct device_node
*dn
)
1902 return of_stdout
== dn
;
1904 EXPORT_SYMBOL_GPL(of_device_is_stdout_path
);