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 extern const struct fwnode_operations of_fwnode_ops;
104 static inline void of_node_init(struct device_node *node)
106 kobject_init(&node->kobj, &of_node_ktype);
107 node->fwnode.ops = &of_fwnode_ops;
110 /* true when node is initialized */
111 static inline int of_node_is_initialized(struct device_node *node)
113 return node && node->kobj.state_initialized;
116 /* true when node is attached (i.e. present on sysfs) */
117 static inline int of_node_is_attached(struct device_node *node)
119 return node && node->kobj.state_in_sysfs;
122 #ifdef CONFIG_OF_DYNAMIC
123 extern struct device_node *of_node_get(struct device_node *node);
124 extern void of_node_put(struct device_node *node);
125 #else /* CONFIG_OF_DYNAMIC */
126 /* Dummy ref counting routines - to be implemented later */
127 static inline struct device_node *of_node_get(struct device_node *node)
131 static inline void of_node_put(struct device_node *node) { }
132 #endif /* !CONFIG_OF_DYNAMIC */
134 /* Pointer for first entry in chain of all nodes. */
135 extern struct device_node *of_root;
136 extern struct device_node *of_chosen;
137 extern struct device_node *of_aliases;
138 extern struct device_node *of_stdout;
139 extern raw_spinlock_t devtree_lock;
141 /* flag descriptions (need to be visible even when !CONFIG_OF) */
142 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
143 #define OF_DETACHED 2 /* node has been detached from the device tree */
144 #define OF_POPULATED 3 /* device already created for the node */
145 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
147 #define OF_BAD_ADDR ((u64)-1)
150 void of_core_init(void);
152 static inline bool is_of_node(const struct fwnode_handle *fwnode)
154 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops;
157 #define to_of_node(__fwnode) \
159 typeof(__fwnode) __to_of_node_fwnode = (__fwnode); \
161 is_of_node(__to_of_node_fwnode) ? \
162 container_of(__to_of_node_fwnode, \
163 struct device_node, fwnode) : \
167 #define of_fwnode_handle(node) \
169 typeof(node) __of_fwnode_handle_node = (node); \
171 __of_fwnode_handle_node ? \
172 &__of_fwnode_handle_node->fwnode : NULL; \
175 static inline bool of_have_populated_dt(void)
177 return of_root != NULL;
180 static inline bool of_node_is_root(const struct device_node *node)
182 return node && (node->parent == NULL);
185 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
187 return test_bit(flag, &n->_flags);
190 static inline int of_node_test_and_set_flag(struct device_node *n,
193 return test_and_set_bit(flag, &n->_flags);
196 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
198 set_bit(flag, &n->_flags);
201 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
203 clear_bit(flag, &n->_flags);
206 static inline int of_property_check_flag(struct property *p, unsigned long flag)
208 return test_bit(flag, &p->_flags);
211 static inline void of_property_set_flag(struct property *p, unsigned long flag)
213 set_bit(flag, &p->_flags);
216 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
218 clear_bit(flag, &p->_flags);
221 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
222 extern struct device_node *of_find_all_nodes(struct device_node *prev);
225 * OF address retrieval & translation
228 /* Helper to read a big number; size is in cells (not bytes) */
229 static inline u64 of_read_number(const __be32 *cell, int size)
233 r = (r << 32) | be32_to_cpu(*(cell++));
237 /* Like of_read_number, but we want an unsigned long result */
238 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
240 /* toss away upper bits if unsigned long is smaller than u64 */
241 return of_read_number(cell, size);
244 #if defined(CONFIG_SPARC)
245 #include <asm/prom.h>
248 /* Default #address and #size cells. Allow arch asm/prom.h to override */
249 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
250 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
251 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
254 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
255 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
257 static inline const char *of_node_full_name(const struct device_node *np)
259 return np ? np->full_name : "<no-node>";
262 #define for_each_of_allnodes_from(from, dn) \
263 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
264 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
265 extern struct device_node *of_find_node_by_name(struct device_node *from,
267 extern struct device_node *of_find_node_by_type(struct device_node *from,
269 extern struct device_node *of_find_compatible_node(struct device_node *from,
270 const char *type, const char *compat);
271 extern struct device_node *of_find_matching_node_and_match(
272 struct device_node *from,
273 const struct of_device_id *matches,
274 const struct of_device_id **match);
276 extern struct device_node *of_find_node_opts_by_path(const char *path,
278 static inline struct device_node *of_find_node_by_path(const char *path)
280 return of_find_node_opts_by_path(path, NULL);
283 extern struct device_node *of_find_node_by_phandle(phandle handle);
284 extern struct device_node *of_get_parent(const struct device_node *node);
285 extern struct device_node *of_get_next_parent(struct device_node *node);
286 extern struct device_node *of_get_next_child(const struct device_node *node,
287 struct device_node *prev);
288 extern struct device_node *of_get_next_available_child(
289 const struct device_node *node, struct device_node *prev);
291 extern struct device_node *of_get_child_by_name(const struct device_node *node,
295 extern struct device_node *of_find_next_cache_node(const struct device_node *);
296 extern int of_find_last_cache_level(unsigned int cpu);
297 extern struct device_node *of_find_node_with_property(
298 struct device_node *from, const char *prop_name);
300 extern struct property *of_find_property(const struct device_node *np,
303 extern int of_property_count_elems_of_size(const struct device_node *np,
304 const char *propname, int elem_size);
305 extern int of_property_read_u32_index(const struct device_node *np,
306 const char *propname,
307 u32 index, u32 *out_value);
308 extern int of_property_read_u64_index(const struct device_node *np,
309 const char *propname,
310 u32 index, u64 *out_value);
311 extern int of_property_read_variable_u8_array(const struct device_node *np,
312 const char *propname, u8 *out_values,
313 size_t sz_min, size_t sz_max);
314 extern int of_property_read_variable_u16_array(const struct device_node *np,
315 const char *propname, u16 *out_values,
316 size_t sz_min, size_t sz_max);
317 extern int of_property_read_variable_u32_array(const struct device_node *np,
318 const char *propname,
322 extern int of_property_read_u64(const struct device_node *np,
323 const char *propname, u64 *out_value);
324 extern int of_property_read_variable_u64_array(const struct device_node *np,
325 const char *propname,
330 extern int of_property_read_string(const struct device_node *np,
331 const char *propname,
332 const char **out_string);
333 extern int of_property_match_string(const struct device_node *np,
334 const char *propname,
336 extern int of_property_read_string_helper(const struct device_node *np,
337 const char *propname,
338 const char **out_strs, size_t sz, int index);
339 extern int of_device_is_compatible(const struct device_node *device,
341 extern int of_device_compatible_match(struct device_node *device,
342 const char *const *compat);
343 extern bool of_device_is_available(const struct device_node *device);
344 extern bool of_device_is_big_endian(const struct device_node *device);
345 extern const void *of_get_property(const struct device_node *node,
348 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
349 #define for_each_property_of_node(dn, pp) \
350 for (pp = dn->properties; pp != NULL; pp = pp->next)
352 extern int of_n_addr_cells(struct device_node *np);
353 extern int of_n_size_cells(struct device_node *np);
354 extern const struct of_device_id *of_match_node(
355 const struct of_device_id *matches, const struct device_node *node);
356 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
357 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
358 extern struct device_node *of_parse_phandle(const struct device_node *np,
359 const char *phandle_name,
361 extern int of_parse_phandle_with_args(const struct device_node *np,
362 const char *list_name, const char *cells_name, int index,
363 struct of_phandle_args *out_args);
364 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
365 const char *list_name, int cells_count, int index,
366 struct of_phandle_args *out_args);
367 extern int of_count_phandle_with_args(const struct device_node *np,
368 const char *list_name, const char *cells_name);
370 /* phandle iterator functions */
371 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
372 const struct device_node *np,
373 const char *list_name,
374 const char *cells_name,
377 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
378 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
382 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
383 extern int of_alias_get_id(struct device_node *np, const char *stem);
384 extern int of_alias_get_highest_id(const char *stem);
386 extern int of_machine_is_compatible(const char *compat);
388 extern int of_add_property(struct device_node *np, struct property *prop);
389 extern int of_remove_property(struct device_node *np, struct property *prop);
390 extern int of_update_property(struct device_node *np, struct property *newprop);
392 /* For updating the device tree at runtime */
393 #define OF_RECONFIG_ATTACH_NODE 0x0001
394 #define OF_RECONFIG_DETACH_NODE 0x0002
395 #define OF_RECONFIG_ADD_PROPERTY 0x0003
396 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
397 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
399 extern int of_attach_node(struct device_node *);
400 extern int of_detach_node(struct device_node *);
402 #define of_match_ptr(_ptr) (_ptr)
405 * of_property_read_u8_array - Find and read an array of u8 from a property.
407 * @np: device node from which the property value is to be read.
408 * @propname: name of the property to be searched.
409 * @out_values: pointer to return value, modified only if return value is 0.
410 * @sz: number of array elements to read
412 * Search for a property in a device node and read 8-bit value(s) from
413 * it. Returns 0 on success, -EINVAL if the property does not exist,
414 * -ENODATA if property does not have a value, and -EOVERFLOW if the
415 * property data isn't large enough.
417 * dts entry of array should be like:
418 * property = /bits/ 8 <0x50 0x60 0x70>;
420 * The out_values is modified only if a valid u8 value can be decoded.
422 static inline int of_property_read_u8_array(const struct device_node *np,
423 const char *propname,
424 u8 *out_values, size_t sz)
426 int ret = of_property_read_variable_u8_array(np, propname, out_values,
435 * of_property_read_u16_array - Find and read an array of u16 from a property.
437 * @np: device node from which the property value is to be read.
438 * @propname: name of the property to be searched.
439 * @out_values: pointer to return value, modified only if return value is 0.
440 * @sz: number of array elements to read
442 * Search for a property in a device node and read 16-bit value(s) from
443 * it. Returns 0 on success, -EINVAL if the property does not exist,
444 * -ENODATA if property does not have a value, and -EOVERFLOW if the
445 * property data isn't large enough.
447 * dts entry of array should be like:
448 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
450 * The out_values is modified only if a valid u16 value can be decoded.
452 static inline int of_property_read_u16_array(const struct device_node *np,
453 const char *propname,
454 u16 *out_values, size_t sz)
456 int ret = of_property_read_variable_u16_array(np, propname, out_values,
465 * of_property_read_u32_array - Find and read an array of 32 bit integers
468 * @np: device node from which the property value is to be read.
469 * @propname: name of the property to be searched.
470 * @out_values: pointer to return value, modified only if return value is 0.
471 * @sz: number of array elements to read
473 * Search for a property in a device node and read 32-bit value(s) from
474 * it. Returns 0 on success, -EINVAL if the property does not exist,
475 * -ENODATA if property does not have a value, and -EOVERFLOW if the
476 * property data isn't large enough.
478 * The out_values is modified only if a valid u32 value can be decoded.
480 static inline int of_property_read_u32_array(const struct device_node *np,
481 const char *propname,
482 u32 *out_values, size_t sz)
484 int ret = of_property_read_variable_u32_array(np, propname, out_values,
493 * of_property_read_u64_array - Find and read an array of 64 bit integers
496 * @np: device node from which the property value is to be read.
497 * @propname: name of the property to be searched.
498 * @out_values: pointer to return value, modified only if return value is 0.
499 * @sz: number of array elements to read
501 * Search for a property in a device node and read 64-bit value(s) from
502 * it. Returns 0 on success, -EINVAL if the property does not exist,
503 * -ENODATA if property does not have a value, and -EOVERFLOW if the
504 * property data isn't large enough.
506 * The out_values is modified only if a valid u64 value can be decoded.
508 static inline int of_property_read_u64_array(const struct device_node *np,
509 const char *propname,
510 u64 *out_values, size_t sz)
512 int ret = of_property_read_variable_u64_array(np, propname, out_values,
521 * struct property *prop;
525 * of_property_for_each_u32(np, "propname", prop, p, u)
526 * printk("U32 value: %x\n", u);
528 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
531 * struct property *prop;
534 * of_property_for_each_string(np, "propname", prop, s)
535 * printk("String value: %s\n", s);
537 const char *of_prop_next_string(struct property *prop, const char *cur);
539 bool of_console_check(struct device_node *dn, char *name, int index);
541 #else /* CONFIG_OF */
543 static inline void of_core_init(void)
547 static inline bool is_of_node(const struct fwnode_handle *fwnode)
552 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
557 static inline const char* of_node_full_name(const struct device_node *np)
562 static inline struct device_node *of_find_node_by_name(struct device_node *from,
568 static inline struct device_node *of_find_node_by_type(struct device_node *from,
574 static inline struct device_node *of_find_matching_node_and_match(
575 struct device_node *from,
576 const struct of_device_id *matches,
577 const struct of_device_id **match)
582 static inline struct device_node *of_find_node_by_path(const char *path)
587 static inline struct device_node *of_find_node_opts_by_path(const char *path,
593 static inline struct device_node *of_find_node_by_phandle(phandle handle)
598 static inline struct device_node *of_get_parent(const struct device_node *node)
603 static inline struct device_node *of_get_next_child(
604 const struct device_node *node, struct device_node *prev)
609 static inline struct device_node *of_get_next_available_child(
610 const struct device_node *node, struct device_node *prev)
615 static inline struct device_node *of_find_node_with_property(
616 struct device_node *from, const char *prop_name)
621 #define of_fwnode_handle(node) NULL
623 static inline bool of_have_populated_dt(void)
628 static inline struct device_node *of_get_child_by_name(
629 const struct device_node *node,
635 static inline int of_device_is_compatible(const struct device_node *device,
641 static inline int of_device_compatible_match(struct device_node *device,
642 const char *const *compat)
647 static inline bool of_device_is_available(const struct device_node *device)
652 static inline bool of_device_is_big_endian(const struct device_node *device)
657 static inline struct property *of_find_property(const struct device_node *np,
664 static inline struct device_node *of_find_compatible_node(
665 struct device_node *from,
672 static inline int of_property_count_elems_of_size(const struct device_node *np,
673 const char *propname, int elem_size)
678 static inline int of_property_read_u32_index(const struct device_node *np,
679 const char *propname, u32 index, u32 *out_value)
684 static inline int of_property_read_u8_array(const struct device_node *np,
685 const char *propname, u8 *out_values, size_t sz)
690 static inline int of_property_read_u16_array(const struct device_node *np,
691 const char *propname, u16 *out_values, size_t sz)
696 static inline int of_property_read_u32_array(const struct device_node *np,
697 const char *propname,
698 u32 *out_values, size_t sz)
703 static inline int of_property_read_u64_array(const struct device_node *np,
704 const char *propname,
705 u64 *out_values, size_t sz)
710 static inline int of_property_read_string(const struct device_node *np,
711 const char *propname,
712 const char **out_string)
717 static inline int of_property_read_string_helper(const struct device_node *np,
718 const char *propname,
719 const char **out_strs, size_t sz, int index)
724 static inline const void *of_get_property(const struct device_node *node,
731 static inline struct device_node *of_get_cpu_node(int cpu,
732 unsigned int *thread)
737 static inline int of_property_read_u64(const struct device_node *np,
738 const char *propname, u64 *out_value)
743 static inline int of_property_match_string(const struct device_node *np,
744 const char *propname,
750 static inline struct device_node *of_parse_phandle(const struct device_node *np,
751 const char *phandle_name,
757 static inline int of_parse_phandle_with_args(const struct device_node *np,
758 const char *list_name,
759 const char *cells_name,
761 struct of_phandle_args *out_args)
766 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
767 const char *list_name, int cells_count, int index,
768 struct of_phandle_args *out_args)
773 static inline int of_count_phandle_with_args(struct device_node *np,
774 const char *list_name,
775 const char *cells_name)
780 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
781 const struct device_node *np,
782 const char *list_name,
783 const char *cells_name,
789 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
794 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
801 static inline int of_alias_get_id(struct device_node *np, const char *stem)
806 static inline int of_alias_get_highest_id(const char *stem)
811 static inline int of_machine_is_compatible(const char *compat)
816 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
821 static inline const __be32 *of_prop_next_u32(struct property *prop,
822 const __be32 *cur, u32 *pu)
827 static inline const char *of_prop_next_string(struct property *prop,
833 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
838 static inline int of_node_test_and_set_flag(struct device_node *n,
844 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
848 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
852 static inline int of_property_check_flag(struct property *p, unsigned long flag)
857 static inline void of_property_set_flag(struct property *p, unsigned long flag)
861 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
865 #define of_match_ptr(_ptr) NULL
866 #define of_match_node(_matches, _node) NULL
867 #endif /* CONFIG_OF */
869 /* Default string compare functions, Allow arch asm/prom.h to override */
870 #if !defined(of_compat_cmp)
871 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
872 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
873 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
876 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
877 extern int of_node_to_nid(struct device_node *np);
879 static inline int of_node_to_nid(struct device_node *device)
885 #ifdef CONFIG_OF_NUMA
886 extern int of_numa_init(void);
888 static inline int of_numa_init(void)
894 static inline struct device_node *of_find_matching_node(
895 struct device_node *from,
896 const struct of_device_id *matches)
898 return of_find_matching_node_and_match(from, matches, NULL);
902 * of_property_count_u8_elems - Count the number of u8 elements in a property
904 * @np: device node from which the property value is to be read.
905 * @propname: name of the property to be searched.
907 * Search for a property in a device node and count the number of u8 elements
908 * in it. Returns number of elements on sucess, -EINVAL if the property does
909 * not exist or its length does not match a multiple of u8 and -ENODATA if the
910 * property does not have a value.
912 static inline int of_property_count_u8_elems(const struct device_node *np,
913 const char *propname)
915 return of_property_count_elems_of_size(np, propname, sizeof(u8));
919 * of_property_count_u16_elems - Count the number of u16 elements in a property
921 * @np: device node from which the property value is to be read.
922 * @propname: name of the property to be searched.
924 * Search for a property in a device node and count the number of u16 elements
925 * in it. Returns number of elements on sucess, -EINVAL if the property does
926 * not exist or its length does not match a multiple of u16 and -ENODATA if the
927 * property does not have a value.
929 static inline int of_property_count_u16_elems(const struct device_node *np,
930 const char *propname)
932 return of_property_count_elems_of_size(np, propname, sizeof(u16));
936 * of_property_count_u32_elems - Count the number of u32 elements in a property
938 * @np: device node from which the property value is to be read.
939 * @propname: name of the property to be searched.
941 * Search for a property in a device node and count the number of u32 elements
942 * in it. Returns number of elements on sucess, -EINVAL if the property does
943 * not exist or its length does not match a multiple of u32 and -ENODATA if the
944 * property does not have a value.
946 static inline int of_property_count_u32_elems(const struct device_node *np,
947 const char *propname)
949 return of_property_count_elems_of_size(np, propname, sizeof(u32));
953 * of_property_count_u64_elems - Count the number of u64 elements in a property
955 * @np: device node from which the property value is to be read.
956 * @propname: name of the property to be searched.
958 * Search for a property in a device node and count the number of u64 elements
959 * in it. Returns number of elements on sucess, -EINVAL if the property does
960 * not exist or its length does not match a multiple of u64 and -ENODATA if the
961 * property does not have a value.
963 static inline int of_property_count_u64_elems(const struct device_node *np,
964 const char *propname)
966 return of_property_count_elems_of_size(np, propname, sizeof(u64));
970 * of_property_read_string_array() - Read an array of strings from a multiple
972 * @np: device node from which the property value is to be read.
973 * @propname: name of the property to be searched.
974 * @out_strs: output array of string pointers.
975 * @sz: number of array elements to read.
977 * Search for a property in a device tree node and retrieve a list of
978 * terminated string values (pointer to data, not a copy) in that property.
980 * If @out_strs is NULL, the number of strings in the property is returned.
982 static inline int of_property_read_string_array(const struct device_node *np,
983 const char *propname, const char **out_strs,
986 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
990 * of_property_count_strings() - Find and return the number of strings from a
991 * multiple strings property.
992 * @np: device node from which the property value is to be read.
993 * @propname: name of the property to be searched.
995 * Search for a property in a device tree node and retrieve the number of null
996 * terminated string contain in it. Returns the number of strings on
997 * success, -EINVAL if the property does not exist, -ENODATA if property
998 * does not have a value, and -EILSEQ if the string is not null-terminated
999 * within the length of the property data.
1001 static inline int of_property_count_strings(const struct device_node *np,
1002 const char *propname)
1004 return of_property_read_string_helper(np, propname, NULL, 0, 0);
1008 * of_property_read_string_index() - Find and read a string from a multiple
1010 * @np: device node from which the property value is to be read.
1011 * @propname: name of the property to be searched.
1012 * @index: index of the string in the list of strings
1013 * @out_string: pointer to null terminated return string, modified only if
1014 * return value is 0.
1016 * Search for a property in a device tree node and retrieve a null
1017 * terminated string value (pointer to data, not a copy) in the list of strings
1018 * contained in that property.
1019 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1020 * property does not have a value, and -EILSEQ if the string is not
1021 * null-terminated within the length of the property data.
1023 * The out_string pointer is modified only if a valid string can be decoded.
1025 static inline int of_property_read_string_index(const struct device_node *np,
1026 const char *propname,
1027 int index, const char **output)
1029 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1030 return rc < 0 ? rc : 0;
1034 * of_property_read_bool - Findfrom a property
1035 * @np: device node from which the property value is to be read.
1036 * @propname: name of the property to be searched.
1038 * Search for a property in a device node.
1039 * Returns true if the property exists false otherwise.
1041 static inline bool of_property_read_bool(const struct device_node *np,
1042 const char *propname)
1044 struct property *prop = of_find_property(np, propname, NULL);
1046 return prop ? true : false;
1049 static inline int of_property_read_u8(const struct device_node *np,
1050 const char *propname,
1053 return of_property_read_u8_array(np, propname, out_value, 1);
1056 static inline int of_property_read_u16(const struct device_node *np,
1057 const char *propname,
1060 return of_property_read_u16_array(np, propname, out_value, 1);
1063 static inline int of_property_read_u32(const struct device_node *np,
1064 const char *propname,
1067 return of_property_read_u32_array(np, propname, out_value, 1);
1070 static inline int of_property_read_s32(const struct device_node *np,
1071 const char *propname,
1074 return of_property_read_u32(np, propname, (u32*) out_value);
1077 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1078 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1079 err = of_phandle_iterator_next(it); \
1081 err = of_phandle_iterator_next(it))
1083 #define of_property_for_each_u32(np, propname, prop, p, u) \
1084 for (prop = of_find_property(np, propname, NULL), \
1085 p = of_prop_next_u32(prop, NULL, &u); \
1087 p = of_prop_next_u32(prop, p, &u))
1089 #define of_property_for_each_string(np, propname, prop, s) \
1090 for (prop = of_find_property(np, propname, NULL), \
1091 s = of_prop_next_string(prop, NULL); \
1093 s = of_prop_next_string(prop, s))
1095 #define for_each_node_by_name(dn, name) \
1096 for (dn = of_find_node_by_name(NULL, name); dn; \
1097 dn = of_find_node_by_name(dn, name))
1098 #define for_each_node_by_type(dn, type) \
1099 for (dn = of_find_node_by_type(NULL, type); dn; \
1100 dn = of_find_node_by_type(dn, type))
1101 #define for_each_compatible_node(dn, type, compatible) \
1102 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1103 dn = of_find_compatible_node(dn, type, compatible))
1104 #define for_each_matching_node(dn, matches) \
1105 for (dn = of_find_matching_node(NULL, matches); dn; \
1106 dn = of_find_matching_node(dn, matches))
1107 #define for_each_matching_node_and_match(dn, matches, match) \
1108 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1109 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1111 #define for_each_child_of_node(parent, child) \
1112 for (child = of_get_next_child(parent, NULL); child != NULL; \
1113 child = of_get_next_child(parent, child))
1114 #define for_each_available_child_of_node(parent, child) \
1115 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1116 child = of_get_next_available_child(parent, child))
1118 #define for_each_node_with_property(dn, prop_name) \
1119 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1120 dn = of_find_node_with_property(dn, prop_name))
1122 static inline int of_get_child_count(const struct device_node *np)
1124 struct device_node *child;
1127 for_each_child_of_node(np, child)
1133 static inline int of_get_available_child_count(const struct device_node *np)
1135 struct device_node *child;
1138 for_each_available_child_of_node(np, child)
1144 #if defined(CONFIG_OF) && !defined(MODULE)
1145 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1146 static const struct of_device_id __of_table_##name \
1147 __used __section(__##table##_of_table) \
1148 = { .compatible = compat, \
1149 .data = (fn == (fn_type)NULL) ? fn : fn }
1151 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1152 static const struct of_device_id __of_table_##name \
1153 __attribute__((unused)) \
1154 = { .compatible = compat, \
1155 .data = (fn == (fn_type)NULL) ? fn : fn }
1158 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1159 typedef int (*of_init_fn_1_ret)(struct device_node *);
1160 typedef void (*of_init_fn_1)(struct device_node *);
1162 #define OF_DECLARE_1(table, name, compat, fn) \
1163 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1164 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1165 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1166 #define OF_DECLARE_2(table, name, compat, fn) \
1167 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1170 * struct of_changeset_entry - Holds a changeset entry
1172 * @node: list_head for the log list
1173 * @action: notifier action
1174 * @np: pointer to the device node affected
1175 * @prop: pointer to the property affected
1176 * @old_prop: hold a pointer to the original property
1178 * Every modification of the device tree during a changeset
1179 * is held in a list of of_changeset_entry structures.
1180 * That way we can recover from a partial application, or we can
1181 * revert the changeset
1183 struct of_changeset_entry {
1184 struct list_head node;
1185 unsigned long action;
1186 struct device_node *np;
1187 struct property *prop;
1188 struct property *old_prop;
1192 * struct of_changeset - changeset tracker structure
1194 * @entries: list_head for the changeset entries
1196 * changesets are a convenient way to apply bulk changes to the
1197 * live tree. In case of an error, changes are rolled-back.
1198 * changesets live on after initial application, and if not
1199 * destroyed after use, they can be reverted in one single call.
1201 struct of_changeset {
1202 struct list_head entries;
1205 enum of_reconfig_change {
1206 OF_RECONFIG_NO_CHANGE = 0,
1207 OF_RECONFIG_CHANGE_ADD,
1208 OF_RECONFIG_CHANGE_REMOVE,
1211 #ifdef CONFIG_OF_DYNAMIC
1212 extern int of_reconfig_notifier_register(struct notifier_block *);
1213 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1214 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1215 extern int of_reconfig_get_state_change(unsigned long action,
1216 struct of_reconfig_data *arg);
1218 extern void of_changeset_init(struct of_changeset *ocs);
1219 extern void of_changeset_destroy(struct of_changeset *ocs);
1220 extern int of_changeset_apply(struct of_changeset *ocs);
1221 extern int of_changeset_revert(struct of_changeset *ocs);
1222 extern int of_changeset_action(struct of_changeset *ocs,
1223 unsigned long action, struct device_node *np,
1224 struct property *prop);
1226 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1227 struct device_node *np)
1229 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1232 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1233 struct device_node *np)
1235 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1238 static inline int of_changeset_add_property(struct of_changeset *ocs,
1239 struct device_node *np, struct property *prop)
1241 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1244 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1245 struct device_node *np, struct property *prop)
1247 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1250 static inline int of_changeset_update_property(struct of_changeset *ocs,
1251 struct device_node *np, struct property *prop)
1253 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1255 #else /* CONFIG_OF_DYNAMIC */
1256 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1260 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1264 static inline int of_reconfig_notify(unsigned long action,
1265 struct of_reconfig_data *arg)
1269 static inline int of_reconfig_get_state_change(unsigned long action,
1270 struct of_reconfig_data *arg)
1274 #endif /* CONFIG_OF_DYNAMIC */
1276 /* CONFIG_OF_RESOLVE api */
1277 extern int of_resolve_phandles(struct device_node *tree);
1280 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1281 * @np: Pointer to the given device_node
1283 * return true if present false otherwise
1285 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1287 return of_property_read_bool(np, "system-power-controller");
1294 enum of_overlay_notify_action {
1295 OF_OVERLAY_PRE_APPLY,
1296 OF_OVERLAY_POST_APPLY,
1297 OF_OVERLAY_PRE_REMOVE,
1298 OF_OVERLAY_POST_REMOVE,
1301 struct of_overlay_notify_data {
1302 struct device_node *overlay;
1303 struct device_node *target;
1306 #ifdef CONFIG_OF_OVERLAY
1308 /* ID based overlays; the API for external users */
1309 int of_overlay_create(struct device_node *tree);
1310 int of_overlay_destroy(int id);
1311 int of_overlay_destroy_all(void);
1313 int of_overlay_notifier_register(struct notifier_block *nb);
1314 int of_overlay_notifier_unregister(struct notifier_block *nb);
1318 static inline int of_overlay_create(struct device_node *tree)
1323 static inline int of_overlay_destroy(int id)
1328 static inline int of_overlay_destroy_all(void)
1333 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1338 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1345 #endif /* _LINUX_OF_H */