4 * Definitions for talking to the Open Firmware PROM on
5 * Power Macintosh and other computers.
7 * Copyright (C) 1996-2005 Paul Mackerras.
9 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
10 * Updates for SPARC64 by David S. Miller
11 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
18 #include <linux/types.h>
19 #include <linux/bitops.h>
20 #include <linux/errno.h>
21 #include <linux/kobject.h>
22 #include <linux/mod_devicetable.h>
23 #include <linux/spinlock.h>
24 #include <linux/topology.h>
25 #include <linux/notifier.h>
26 #include <linux/property.h>
27 #include <linux/list.h>
29 #include <asm/byteorder.h>
30 #include <asm/errno.h>
39 struct property *next;
41 unsigned int unique_id;
42 struct bin_attribute attr;
45 #if defined(CONFIG_SPARC)
46 struct of_irq_controller;
53 const char *full_name;
54 struct fwnode_handle fwnode;
56 struct property *properties;
57 struct property *deadprops; /* removed properties */
58 struct device_node *parent;
59 struct device_node *child;
60 struct device_node *sibling;
64 #if defined(CONFIG_SPARC)
65 const char *path_component_name;
66 unsigned int unique_id;
67 struct of_irq_controller *irq_trans;
71 #define MAX_PHANDLE_ARGS 16
72 struct of_phandle_args {
73 struct device_node *np;
75 uint32_t args[MAX_PHANDLE_ARGS];
78 struct of_phandle_iterator {
79 /* Common iterator information */
80 const char *cells_name;
82 const struct device_node *parent;
84 /* List size information */
85 const __be32 *list_end;
86 const __be32 *phandle_end;
88 /* Current position state */
92 struct device_node *node;
95 struct of_reconfig_data {
96 struct device_node *dn;
97 struct property *prop;
98 struct property *old_prop;
101 /* initialize a node */
102 extern struct kobj_type of_node_ktype;
103 static inline void of_node_init(struct device_node *node)
105 kobject_init(&node->kobj, &of_node_ktype);
106 node->fwnode.type = FWNODE_OF;
109 /* true when node is initialized */
110 static inline int of_node_is_initialized(struct device_node *node)
112 return node && node->kobj.state_initialized;
115 /* true when node is attached (i.e. present on sysfs) */
116 static inline int of_node_is_attached(struct device_node *node)
118 return node && node->kobj.state_in_sysfs;
121 #ifdef CONFIG_OF_DYNAMIC
122 extern struct device_node *of_node_get(struct device_node *node);
123 extern void of_node_put(struct device_node *node);
124 #else /* CONFIG_OF_DYNAMIC */
125 /* Dummy ref counting routines - to be implemented later */
126 static inline struct device_node *of_node_get(struct device_node *node)
130 static inline void of_node_put(struct device_node *node) { }
131 #endif /* !CONFIG_OF_DYNAMIC */
133 /* Pointer for first entry in chain of all nodes. */
134 extern struct device_node *of_root;
135 extern struct device_node *of_chosen;
136 extern struct device_node *of_aliases;
137 extern struct device_node *of_stdout;
138 extern raw_spinlock_t devtree_lock;
140 /* flag descriptions (need to be visible even when !CONFIG_OF) */
141 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
142 #define OF_DETACHED 2 /* node has been detached from the device tree */
143 #define OF_POPULATED 3 /* device already created for the node */
144 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
146 #define OF_BAD_ADDR ((u64)-1)
149 void of_core_init(void);
151 static inline bool is_of_node(struct fwnode_handle *fwnode)
153 return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_OF;
156 static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
158 return is_of_node(fwnode) ?
159 container_of(fwnode, struct device_node, fwnode) : NULL;
162 static inline bool of_have_populated_dt(void)
164 return of_root != NULL;
167 static inline bool of_node_is_root(const struct device_node *node)
169 return node && (node->parent == NULL);
172 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
174 return test_bit(flag, &n->_flags);
177 static inline int of_node_test_and_set_flag(struct device_node *n,
180 return test_and_set_bit(flag, &n->_flags);
183 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
185 set_bit(flag, &n->_flags);
188 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
190 clear_bit(flag, &n->_flags);
193 static inline int of_property_check_flag(struct property *p, unsigned long flag)
195 return test_bit(flag, &p->_flags);
198 static inline void of_property_set_flag(struct property *p, unsigned long flag)
200 set_bit(flag, &p->_flags);
203 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
205 clear_bit(flag, &p->_flags);
208 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
209 extern struct device_node *of_find_all_nodes(struct device_node *prev);
212 * OF address retrieval & translation
215 /* Helper to read a big number; size is in cells (not bytes) */
216 static inline u64 of_read_number(const __be32 *cell, int size)
220 r = (r << 32) | be32_to_cpu(*(cell++));
224 /* Like of_read_number, but we want an unsigned long result */
225 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
227 /* toss away upper bits if unsigned long is smaller than u64 */
228 return of_read_number(cell, size);
231 #if defined(CONFIG_SPARC)
232 #include <asm/prom.h>
235 /* Default #address and #size cells. Allow arch asm/prom.h to override */
236 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
237 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
238 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
241 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
242 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
244 static inline const char *of_node_full_name(const struct device_node *np)
246 return np ? np->full_name : "<no-node>";
249 #define for_each_of_allnodes_from(from, dn) \
250 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
251 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
252 extern struct device_node *of_find_node_by_name(struct device_node *from,
254 extern struct device_node *of_find_node_by_type(struct device_node *from,
256 extern struct device_node *of_find_compatible_node(struct device_node *from,
257 const char *type, const char *compat);
258 extern struct device_node *of_find_matching_node_and_match(
259 struct device_node *from,
260 const struct of_device_id *matches,
261 const struct of_device_id **match);
263 extern struct device_node *of_find_node_opts_by_path(const char *path,
265 static inline struct device_node *of_find_node_by_path(const char *path)
267 return of_find_node_opts_by_path(path, NULL);
270 extern struct device_node *of_find_node_by_phandle(phandle handle);
271 extern struct device_node *of_get_parent(const struct device_node *node);
272 extern struct device_node *of_get_next_parent(struct device_node *node);
273 extern struct device_node *of_get_next_child(const struct device_node *node,
274 struct device_node *prev);
275 extern struct device_node *of_get_next_available_child(
276 const struct device_node *node, struct device_node *prev);
278 extern struct device_node *of_get_child_by_name(const struct device_node *node,
282 extern struct device_node *of_find_next_cache_node(const struct device_node *);
283 extern int of_find_last_cache_level(unsigned int cpu);
284 extern struct device_node *of_find_node_with_property(
285 struct device_node *from, const char *prop_name);
287 extern struct property *of_find_property(const struct device_node *np,
290 extern int of_property_count_elems_of_size(const struct device_node *np,
291 const char *propname, int elem_size);
292 extern int of_property_read_u32_index(const struct device_node *np,
293 const char *propname,
294 u32 index, u32 *out_value);
295 extern int of_property_read_u64_index(const struct device_node *np,
296 const char *propname,
297 u32 index, u64 *out_value);
298 extern int of_property_read_variable_u8_array(const struct device_node *np,
299 const char *propname, u8 *out_values,
300 size_t sz_min, size_t sz_max);
301 extern int of_property_read_variable_u16_array(const struct device_node *np,
302 const char *propname, u16 *out_values,
303 size_t sz_min, size_t sz_max);
304 extern int of_property_read_variable_u32_array(const struct device_node *np,
305 const char *propname,
309 extern int of_property_read_u64(const struct device_node *np,
310 const char *propname, u64 *out_value);
311 extern int of_property_read_variable_u64_array(const struct device_node *np,
312 const char *propname,
317 extern int of_property_read_string(const struct device_node *np,
318 const char *propname,
319 const char **out_string);
320 extern int of_property_match_string(const struct device_node *np,
321 const char *propname,
323 extern int of_property_read_string_helper(const struct device_node *np,
324 const char *propname,
325 const char **out_strs, size_t sz, int index);
326 extern int of_device_is_compatible(const struct device_node *device,
328 extern int of_device_compatible_match(struct device_node *device,
329 const char *const *compat);
330 extern bool of_device_is_available(const struct device_node *device);
331 extern bool of_device_is_big_endian(const struct device_node *device);
332 extern const void *of_get_property(const struct device_node *node,
335 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
336 #define for_each_property_of_node(dn, pp) \
337 for (pp = dn->properties; pp != NULL; pp = pp->next)
339 extern int of_n_addr_cells(struct device_node *np);
340 extern int of_n_size_cells(struct device_node *np);
341 extern const struct of_device_id *of_match_node(
342 const struct of_device_id *matches, const struct device_node *node);
343 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
344 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
345 extern struct device_node *of_parse_phandle(const struct device_node *np,
346 const char *phandle_name,
348 extern int of_parse_phandle_with_args(const struct device_node *np,
349 const char *list_name, const char *cells_name, int index,
350 struct of_phandle_args *out_args);
351 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
352 const char *list_name, int cells_count, int index,
353 struct of_phandle_args *out_args);
354 extern int of_count_phandle_with_args(const struct device_node *np,
355 const char *list_name, const char *cells_name);
357 /* phandle iterator functions */
358 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
359 const struct device_node *np,
360 const char *list_name,
361 const char *cells_name,
364 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
365 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
369 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
370 extern int of_alias_get_id(struct device_node *np, const char *stem);
371 extern int of_alias_get_highest_id(const char *stem);
373 extern int of_machine_is_compatible(const char *compat);
375 extern int of_add_property(struct device_node *np, struct property *prop);
376 extern int of_remove_property(struct device_node *np, struct property *prop);
377 extern int of_update_property(struct device_node *np, struct property *newprop);
379 /* For updating the device tree at runtime */
380 #define OF_RECONFIG_ATTACH_NODE 0x0001
381 #define OF_RECONFIG_DETACH_NODE 0x0002
382 #define OF_RECONFIG_ADD_PROPERTY 0x0003
383 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
384 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
386 extern int of_attach_node(struct device_node *);
387 extern int of_detach_node(struct device_node *);
389 #define of_match_ptr(_ptr) (_ptr)
392 * of_property_read_u8_array - Find and read an array of u8 from a property.
394 * @np: device node from which the property value is to be read.
395 * @propname: name of the property to be searched.
396 * @out_values: pointer to return value, modified only if return value is 0.
397 * @sz: number of array elements to read
399 * Search for a property in a device node and read 8-bit value(s) from
400 * it. Returns 0 on success, -EINVAL if the property does not exist,
401 * -ENODATA if property does not have a value, and -EOVERFLOW if the
402 * property data isn't large enough.
404 * dts entry of array should be like:
405 * property = /bits/ 8 <0x50 0x60 0x70>;
407 * The out_values is modified only if a valid u8 value can be decoded.
409 static inline int of_property_read_u8_array(const struct device_node *np,
410 const char *propname,
411 u8 *out_values, size_t sz)
413 int ret = of_property_read_variable_u8_array(np, propname, out_values,
422 * of_property_read_u16_array - Find and read an array of u16 from a property.
424 * @np: device node from which the property value is to be read.
425 * @propname: name of the property to be searched.
426 * @out_values: pointer to return value, modified only if return value is 0.
427 * @sz: number of array elements to read
429 * Search for a property in a device node and read 16-bit value(s) from
430 * it. Returns 0 on success, -EINVAL if the property does not exist,
431 * -ENODATA if property does not have a value, and -EOVERFLOW if the
432 * property data isn't large enough.
434 * dts entry of array should be like:
435 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
437 * The out_values is modified only if a valid u16 value can be decoded.
439 static inline int of_property_read_u16_array(const struct device_node *np,
440 const char *propname,
441 u16 *out_values, size_t sz)
443 int ret = of_property_read_variable_u16_array(np, propname, out_values,
452 * of_property_read_u32_array - Find and read an array of 32 bit integers
455 * @np: device node from which the property value is to be read.
456 * @propname: name of the property to be searched.
457 * @out_values: pointer to return value, modified only if return value is 0.
458 * @sz: number of array elements to read
460 * Search for a property in a device node and read 32-bit value(s) from
461 * it. Returns 0 on success, -EINVAL if the property does not exist,
462 * -ENODATA if property does not have a value, and -EOVERFLOW if the
463 * property data isn't large enough.
465 * The out_values is modified only if a valid u32 value can be decoded.
467 static inline int of_property_read_u32_array(const struct device_node *np,
468 const char *propname,
469 u32 *out_values, size_t sz)
471 int ret = of_property_read_variable_u32_array(np, propname, out_values,
480 * of_property_read_u64_array - Find and read an array of 64 bit integers
483 * @np: device node from which the property value is to be read.
484 * @propname: name of the property to be searched.
485 * @out_values: pointer to return value, modified only if return value is 0.
486 * @sz: number of array elements to read
488 * Search for a property in a device node and read 64-bit value(s) from
489 * it. Returns 0 on success, -EINVAL if the property does not exist,
490 * -ENODATA if property does not have a value, and -EOVERFLOW if the
491 * property data isn't large enough.
493 * The out_values is modified only if a valid u64 value can be decoded.
495 static inline int of_property_read_u64_array(const struct device_node *np,
496 const char *propname,
497 u64 *out_values, size_t sz)
499 int ret = of_property_read_variable_u64_array(np, propname, out_values,
508 * struct property *prop;
512 * of_property_for_each_u32(np, "propname", prop, p, u)
513 * printk("U32 value: %x\n", u);
515 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
518 * struct property *prop;
521 * of_property_for_each_string(np, "propname", prop, s)
522 * printk("String value: %s\n", s);
524 const char *of_prop_next_string(struct property *prop, const char *cur);
526 bool of_console_check(struct device_node *dn, char *name, int index);
528 #else /* CONFIG_OF */
530 static inline void of_core_init(void)
534 static inline bool is_of_node(struct fwnode_handle *fwnode)
539 static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
544 static inline const char* of_node_full_name(const struct device_node *np)
549 static inline struct device_node *of_find_node_by_name(struct device_node *from,
555 static inline struct device_node *of_find_node_by_type(struct device_node *from,
561 static inline struct device_node *of_find_matching_node_and_match(
562 struct device_node *from,
563 const struct of_device_id *matches,
564 const struct of_device_id **match)
569 static inline struct device_node *of_find_node_by_path(const char *path)
574 static inline struct device_node *of_find_node_opts_by_path(const char *path,
580 static inline struct device_node *of_find_node_by_phandle(phandle handle)
585 static inline struct device_node *of_get_parent(const struct device_node *node)
590 static inline struct device_node *of_get_next_child(
591 const struct device_node *node, struct device_node *prev)
596 static inline struct device_node *of_get_next_available_child(
597 const struct device_node *node, struct device_node *prev)
602 static inline struct device_node *of_find_node_with_property(
603 struct device_node *from, const char *prop_name)
608 static inline bool of_have_populated_dt(void)
613 static inline struct device_node *of_get_child_by_name(
614 const struct device_node *node,
620 static inline int of_device_is_compatible(const struct device_node *device,
626 static inline bool of_device_is_available(const struct device_node *device)
631 static inline bool of_device_is_big_endian(const struct device_node *device)
636 static inline struct property *of_find_property(const struct device_node *np,
643 static inline struct device_node *of_find_compatible_node(
644 struct device_node *from,
651 static inline int of_property_count_elems_of_size(const struct device_node *np,
652 const char *propname, int elem_size)
657 static inline int of_property_read_u32_index(const struct device_node *np,
658 const char *propname, u32 index, u32 *out_value)
663 static inline int of_property_read_u8_array(const struct device_node *np,
664 const char *propname, u8 *out_values, size_t sz)
669 static inline int of_property_read_u16_array(const struct device_node *np,
670 const char *propname, u16 *out_values, size_t sz)
675 static inline int of_property_read_u32_array(const struct device_node *np,
676 const char *propname,
677 u32 *out_values, size_t sz)
682 static inline int of_property_read_u64_array(const struct device_node *np,
683 const char *propname,
684 u64 *out_values, size_t sz)
689 static inline int of_property_read_string(const struct device_node *np,
690 const char *propname,
691 const char **out_string)
696 static inline int of_property_read_string_helper(const struct device_node *np,
697 const char *propname,
698 const char **out_strs, size_t sz, int index)
703 static inline const void *of_get_property(const struct device_node *node,
710 static inline struct device_node *of_get_cpu_node(int cpu,
711 unsigned int *thread)
716 static inline int of_property_read_u64(const struct device_node *np,
717 const char *propname, u64 *out_value)
722 static inline int of_property_match_string(const struct device_node *np,
723 const char *propname,
729 static inline struct device_node *of_parse_phandle(const struct device_node *np,
730 const char *phandle_name,
736 static inline int of_parse_phandle_with_args(const struct device_node *np,
737 const char *list_name,
738 const char *cells_name,
740 struct of_phandle_args *out_args)
745 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
746 const char *list_name, int cells_count, int index,
747 struct of_phandle_args *out_args)
752 static inline int of_count_phandle_with_args(struct device_node *np,
753 const char *list_name,
754 const char *cells_name)
759 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
760 const struct device_node *np,
761 const char *list_name,
762 const char *cells_name,
768 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
773 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
780 static inline int of_alias_get_id(struct device_node *np, const char *stem)
785 static inline int of_alias_get_highest_id(const char *stem)
790 static inline int of_machine_is_compatible(const char *compat)
795 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
800 static inline const __be32 *of_prop_next_u32(struct property *prop,
801 const __be32 *cur, u32 *pu)
806 static inline const char *of_prop_next_string(struct property *prop,
812 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
817 static inline int of_node_test_and_set_flag(struct device_node *n,
823 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
827 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
831 static inline int of_property_check_flag(struct property *p, unsigned long flag)
836 static inline void of_property_set_flag(struct property *p, unsigned long flag)
840 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
844 #define of_match_ptr(_ptr) NULL
845 #define of_match_node(_matches, _node) NULL
846 #endif /* CONFIG_OF */
848 /* Default string compare functions, Allow arch asm/prom.h to override */
849 #if !defined(of_compat_cmp)
850 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
851 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
852 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
855 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
856 extern int of_node_to_nid(struct device_node *np);
858 static inline int of_node_to_nid(struct device_node *device)
864 #ifdef CONFIG_OF_NUMA
865 extern int of_numa_init(void);
867 static inline int of_numa_init(void)
873 static inline struct device_node *of_find_matching_node(
874 struct device_node *from,
875 const struct of_device_id *matches)
877 return of_find_matching_node_and_match(from, matches, NULL);
881 * of_property_count_u8_elems - Count the number of u8 elements in a property
883 * @np: device node from which the property value is to be read.
884 * @propname: name of the property to be searched.
886 * Search for a property in a device node and count the number of u8 elements
887 * in it. Returns number of elements on sucess, -EINVAL if the property does
888 * not exist or its length does not match a multiple of u8 and -ENODATA if the
889 * property does not have a value.
891 static inline int of_property_count_u8_elems(const struct device_node *np,
892 const char *propname)
894 return of_property_count_elems_of_size(np, propname, sizeof(u8));
898 * of_property_count_u16_elems - Count the number of u16 elements in a property
900 * @np: device node from which the property value is to be read.
901 * @propname: name of the property to be searched.
903 * Search for a property in a device node and count the number of u16 elements
904 * in it. Returns number of elements on sucess, -EINVAL if the property does
905 * not exist or its length does not match a multiple of u16 and -ENODATA if the
906 * property does not have a value.
908 static inline int of_property_count_u16_elems(const struct device_node *np,
909 const char *propname)
911 return of_property_count_elems_of_size(np, propname, sizeof(u16));
915 * of_property_count_u32_elems - Count the number of u32 elements in a property
917 * @np: device node from which the property value is to be read.
918 * @propname: name of the property to be searched.
920 * Search for a property in a device node and count the number of u32 elements
921 * in it. Returns number of elements on sucess, -EINVAL if the property does
922 * not exist or its length does not match a multiple of u32 and -ENODATA if the
923 * property does not have a value.
925 static inline int of_property_count_u32_elems(const struct device_node *np,
926 const char *propname)
928 return of_property_count_elems_of_size(np, propname, sizeof(u32));
932 * of_property_count_u64_elems - Count the number of u64 elements in a property
934 * @np: device node from which the property value is to be read.
935 * @propname: name of the property to be searched.
937 * Search for a property in a device node and count the number of u64 elements
938 * in it. Returns number of elements on sucess, -EINVAL if the property does
939 * not exist or its length does not match a multiple of u64 and -ENODATA if the
940 * property does not have a value.
942 static inline int of_property_count_u64_elems(const struct device_node *np,
943 const char *propname)
945 return of_property_count_elems_of_size(np, propname, sizeof(u64));
949 * of_property_read_string_array() - Read an array of strings from a multiple
951 * @np: device node from which the property value is to be read.
952 * @propname: name of the property to be searched.
953 * @out_strs: output array of string pointers.
954 * @sz: number of array elements to read.
956 * Search for a property in a device tree node and retrieve a list of
957 * terminated string values (pointer to data, not a copy) in that property.
959 * If @out_strs is NULL, the number of strings in the property is returned.
961 static inline int of_property_read_string_array(const struct device_node *np,
962 const char *propname, const char **out_strs,
965 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
969 * of_property_count_strings() - Find and return the number of strings from a
970 * multiple strings property.
971 * @np: device node from which the property value is to be read.
972 * @propname: name of the property to be searched.
974 * Search for a property in a device tree node and retrieve the number of null
975 * terminated string contain in it. Returns the number of strings on
976 * success, -EINVAL if the property does not exist, -ENODATA if property
977 * does not have a value, and -EILSEQ if the string is not null-terminated
978 * within the length of the property data.
980 static inline int of_property_count_strings(const struct device_node *np,
981 const char *propname)
983 return of_property_read_string_helper(np, propname, NULL, 0, 0);
987 * of_property_read_string_index() - Find and read a string from a multiple
989 * @np: device node from which the property value is to be read.
990 * @propname: name of the property to be searched.
991 * @index: index of the string in the list of strings
992 * @out_string: pointer to null terminated return string, modified only if
995 * Search for a property in a device tree node and retrieve a null
996 * terminated string value (pointer to data, not a copy) in the list of strings
997 * contained in that property.
998 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
999 * property does not have a value, and -EILSEQ if the string is not
1000 * null-terminated within the length of the property data.
1002 * The out_string pointer is modified only if a valid string can be decoded.
1004 static inline int of_property_read_string_index(const struct device_node *np,
1005 const char *propname,
1006 int index, const char **output)
1008 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1009 return rc < 0 ? rc : 0;
1013 * of_property_read_bool - Findfrom a property
1014 * @np: device node from which the property value is to be read.
1015 * @propname: name of the property to be searched.
1017 * Search for a property in a device node.
1018 * Returns true if the property exists false otherwise.
1020 static inline bool of_property_read_bool(const struct device_node *np,
1021 const char *propname)
1023 struct property *prop = of_find_property(np, propname, NULL);
1025 return prop ? true : false;
1028 static inline int of_property_read_u8(const struct device_node *np,
1029 const char *propname,
1032 return of_property_read_u8_array(np, propname, out_value, 1);
1035 static inline int of_property_read_u16(const struct device_node *np,
1036 const char *propname,
1039 return of_property_read_u16_array(np, propname, out_value, 1);
1042 static inline int of_property_read_u32(const struct device_node *np,
1043 const char *propname,
1046 return of_property_read_u32_array(np, propname, out_value, 1);
1049 static inline int of_property_read_s32(const struct device_node *np,
1050 const char *propname,
1053 return of_property_read_u32(np, propname, (u32*) out_value);
1056 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1057 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1058 err = of_phandle_iterator_next(it); \
1060 err = of_phandle_iterator_next(it))
1062 #define of_property_for_each_u32(np, propname, prop, p, u) \
1063 for (prop = of_find_property(np, propname, NULL), \
1064 p = of_prop_next_u32(prop, NULL, &u); \
1066 p = of_prop_next_u32(prop, p, &u))
1068 #define of_property_for_each_string(np, propname, prop, s) \
1069 for (prop = of_find_property(np, propname, NULL), \
1070 s = of_prop_next_string(prop, NULL); \
1072 s = of_prop_next_string(prop, s))
1074 #define for_each_node_by_name(dn, name) \
1075 for (dn = of_find_node_by_name(NULL, name); dn; \
1076 dn = of_find_node_by_name(dn, name))
1077 #define for_each_node_by_type(dn, type) \
1078 for (dn = of_find_node_by_type(NULL, type); dn; \
1079 dn = of_find_node_by_type(dn, type))
1080 #define for_each_compatible_node(dn, type, compatible) \
1081 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1082 dn = of_find_compatible_node(dn, type, compatible))
1083 #define for_each_matching_node(dn, matches) \
1084 for (dn = of_find_matching_node(NULL, matches); dn; \
1085 dn = of_find_matching_node(dn, matches))
1086 #define for_each_matching_node_and_match(dn, matches, match) \
1087 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1088 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1090 #define for_each_child_of_node(parent, child) \
1091 for (child = of_get_next_child(parent, NULL); child != NULL; \
1092 child = of_get_next_child(parent, child))
1093 #define for_each_available_child_of_node(parent, child) \
1094 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1095 child = of_get_next_available_child(parent, child))
1097 #define for_each_node_with_property(dn, prop_name) \
1098 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1099 dn = of_find_node_with_property(dn, prop_name))
1101 static inline int of_get_child_count(const struct device_node *np)
1103 struct device_node *child;
1106 for_each_child_of_node(np, child)
1112 static inline int of_get_available_child_count(const struct device_node *np)
1114 struct device_node *child;
1117 for_each_available_child_of_node(np, child)
1123 #if defined(CONFIG_OF) && !defined(MODULE)
1124 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1125 static const struct of_device_id __of_table_##name \
1126 __used __section(__##table##_of_table) \
1127 = { .compatible = compat, \
1128 .data = (fn == (fn_type)NULL) ? fn : fn }
1130 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1131 static const struct of_device_id __of_table_##name \
1132 __attribute__((unused)) \
1133 = { .compatible = compat, \
1134 .data = (fn == (fn_type)NULL) ? fn : fn }
1137 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1138 typedef int (*of_init_fn_1_ret)(struct device_node *);
1139 typedef void (*of_init_fn_1)(struct device_node *);
1141 #define OF_DECLARE_1(table, name, compat, fn) \
1142 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1143 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1144 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1145 #define OF_DECLARE_2(table, name, compat, fn) \
1146 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1149 * struct of_changeset_entry - Holds a changeset entry
1151 * @node: list_head for the log list
1152 * @action: notifier action
1153 * @np: pointer to the device node affected
1154 * @prop: pointer to the property affected
1155 * @old_prop: hold a pointer to the original property
1157 * Every modification of the device tree during a changeset
1158 * is held in a list of of_changeset_entry structures.
1159 * That way we can recover from a partial application, or we can
1160 * revert the changeset
1162 struct of_changeset_entry {
1163 struct list_head node;
1164 unsigned long action;
1165 struct device_node *np;
1166 struct property *prop;
1167 struct property *old_prop;
1171 * struct of_changeset - changeset tracker structure
1173 * @entries: list_head for the changeset entries
1175 * changesets are a convenient way to apply bulk changes to the
1176 * live tree. In case of an error, changes are rolled-back.
1177 * changesets live on after initial application, and if not
1178 * destroyed after use, they can be reverted in one single call.
1180 struct of_changeset {
1181 struct list_head entries;
1184 enum of_reconfig_change {
1185 OF_RECONFIG_NO_CHANGE = 0,
1186 OF_RECONFIG_CHANGE_ADD,
1187 OF_RECONFIG_CHANGE_REMOVE,
1190 #ifdef CONFIG_OF_DYNAMIC
1191 extern int of_reconfig_notifier_register(struct notifier_block *);
1192 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1193 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1194 extern int of_reconfig_get_state_change(unsigned long action,
1195 struct of_reconfig_data *arg);
1197 extern void of_changeset_init(struct of_changeset *ocs);
1198 extern void of_changeset_destroy(struct of_changeset *ocs);
1199 extern int of_changeset_apply(struct of_changeset *ocs);
1200 extern int of_changeset_revert(struct of_changeset *ocs);
1201 extern int of_changeset_action(struct of_changeset *ocs,
1202 unsigned long action, struct device_node *np,
1203 struct property *prop);
1205 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1206 struct device_node *np)
1208 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1211 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1212 struct device_node *np)
1214 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1217 static inline int of_changeset_add_property(struct of_changeset *ocs,
1218 struct device_node *np, struct property *prop)
1220 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1223 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1224 struct device_node *np, struct property *prop)
1226 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1229 static inline int of_changeset_update_property(struct of_changeset *ocs,
1230 struct device_node *np, struct property *prop)
1232 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1234 #else /* CONFIG_OF_DYNAMIC */
1235 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1239 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1243 static inline int of_reconfig_notify(unsigned long action,
1244 struct of_reconfig_data *arg)
1248 static inline int of_reconfig_get_state_change(unsigned long action,
1249 struct of_reconfig_data *arg)
1253 #endif /* CONFIG_OF_DYNAMIC */
1255 /* CONFIG_OF_RESOLVE api */
1256 extern int of_resolve_phandles(struct device_node *tree);
1259 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1260 * @np: Pointer to the given device_node
1262 * return true if present false otherwise
1264 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1266 return of_property_read_bool(np, "system-power-controller");
1273 enum of_overlay_notify_action {
1274 OF_OVERLAY_PRE_APPLY,
1275 OF_OVERLAY_POST_APPLY,
1276 OF_OVERLAY_PRE_REMOVE,
1277 OF_OVERLAY_POST_REMOVE,
1280 struct of_overlay_notify_data {
1281 struct device_node *overlay;
1282 struct device_node *target;
1285 #ifdef CONFIG_OF_OVERLAY
1287 /* ID based overlays; the API for external users */
1288 int of_overlay_create(struct device_node *tree);
1289 int of_overlay_destroy(int id);
1290 int of_overlay_destroy_all(void);
1292 int of_overlay_notifier_register(struct notifier_block *nb);
1293 int of_overlay_notifier_unregister(struct notifier_block *nb);
1297 static inline int of_overlay_create(struct device_node *tree)
1302 static inline int of_overlay_destroy(int id)
1307 static inline int of_overlay_destroy_all(void)
1312 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1317 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1324 #endif /* _LINUX_OF_H */