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.type = FWNODE_OF;
108 node->fwnode.ops = &of_fwnode_ops;
111 /* true when node is initialized */
112 static inline int of_node_is_initialized(struct device_node *node)
114 return node && node->kobj.state_initialized;
117 /* true when node is attached (i.e. present on sysfs) */
118 static inline int of_node_is_attached(struct device_node *node)
120 return node && node->kobj.state_in_sysfs;
123 #ifdef CONFIG_OF_DYNAMIC
124 extern struct device_node *of_node_get(struct device_node *node);
125 extern void of_node_put(struct device_node *node);
126 #else /* CONFIG_OF_DYNAMIC */
127 /* Dummy ref counting routines - to be implemented later */
128 static inline struct device_node *of_node_get(struct device_node *node)
132 static inline void of_node_put(struct device_node *node) { }
133 #endif /* !CONFIG_OF_DYNAMIC */
135 /* Pointer for first entry in chain of all nodes. */
136 extern struct device_node *of_root;
137 extern struct device_node *of_chosen;
138 extern struct device_node *of_aliases;
139 extern struct device_node *of_stdout;
140 extern raw_spinlock_t devtree_lock;
142 /* flag descriptions (need to be visible even when !CONFIG_OF) */
143 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
144 #define OF_DETACHED 2 /* node has been detached from the device tree */
145 #define OF_POPULATED 3 /* device already created for the node */
146 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
148 #define OF_BAD_ADDR ((u64)-1)
151 void of_core_init(void);
153 static inline bool is_of_node(const struct fwnode_handle *fwnode)
155 return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_OF;
158 #define to_of_node(__fwnode) \
160 typeof(__fwnode) __to_of_node_fwnode = (__fwnode); \
162 is_of_node(__to_of_node_fwnode) ? \
163 container_of(__to_of_node_fwnode, \
164 struct device_node, fwnode) : \
168 #define of_fwnode_handle(node) \
170 typeof(node) __of_fwnode_handle_node = (node); \
172 __of_fwnode_handle_node ? \
173 &__of_fwnode_handle_node->fwnode : NULL; \
176 static inline bool of_have_populated_dt(void)
178 return of_root != NULL;
181 static inline bool of_node_is_root(const struct device_node *node)
183 return node && (node->parent == NULL);
186 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
188 return test_bit(flag, &n->_flags);
191 static inline int of_node_test_and_set_flag(struct device_node *n,
194 return test_and_set_bit(flag, &n->_flags);
197 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
199 set_bit(flag, &n->_flags);
202 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
204 clear_bit(flag, &n->_flags);
207 static inline int of_property_check_flag(struct property *p, unsigned long flag)
209 return test_bit(flag, &p->_flags);
212 static inline void of_property_set_flag(struct property *p, unsigned long flag)
214 set_bit(flag, &p->_flags);
217 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
219 clear_bit(flag, &p->_flags);
222 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
223 extern struct device_node *of_find_all_nodes(struct device_node *prev);
226 * OF address retrieval & translation
229 /* Helper to read a big number; size is in cells (not bytes) */
230 static inline u64 of_read_number(const __be32 *cell, int size)
234 r = (r << 32) | be32_to_cpu(*(cell++));
238 /* Like of_read_number, but we want an unsigned long result */
239 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
241 /* toss away upper bits if unsigned long is smaller than u64 */
242 return of_read_number(cell, size);
245 #if defined(CONFIG_SPARC)
246 #include <asm/prom.h>
249 /* Default #address and #size cells. Allow arch asm/prom.h to override */
250 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
251 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
252 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
255 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
256 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
258 static inline const char *of_node_full_name(const struct device_node *np)
260 return np ? np->full_name : "<no-node>";
263 #define for_each_of_allnodes_from(from, dn) \
264 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
265 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
266 extern struct device_node *of_find_node_by_name(struct device_node *from,
268 extern struct device_node *of_find_node_by_type(struct device_node *from,
270 extern struct device_node *of_find_compatible_node(struct device_node *from,
271 const char *type, const char *compat);
272 extern struct device_node *of_find_matching_node_and_match(
273 struct device_node *from,
274 const struct of_device_id *matches,
275 const struct of_device_id **match);
277 extern struct device_node *of_find_node_opts_by_path(const char *path,
279 static inline struct device_node *of_find_node_by_path(const char *path)
281 return of_find_node_opts_by_path(path, NULL);
284 extern struct device_node *of_find_node_by_phandle(phandle handle);
285 extern struct device_node *of_get_parent(const struct device_node *node);
286 extern struct device_node *of_get_next_parent(struct device_node *node);
287 extern struct device_node *of_get_next_child(const struct device_node *node,
288 struct device_node *prev);
289 extern struct device_node *of_get_next_available_child(
290 const struct device_node *node, struct device_node *prev);
292 extern struct device_node *of_get_child_by_name(const struct device_node *node,
296 extern struct device_node *of_find_next_cache_node(const struct device_node *);
297 extern int of_find_last_cache_level(unsigned int cpu);
298 extern struct device_node *of_find_node_with_property(
299 struct device_node *from, const char *prop_name);
301 extern struct property *of_find_property(const struct device_node *np,
304 extern int of_property_count_elems_of_size(const struct device_node *np,
305 const char *propname, int elem_size);
306 extern int of_property_read_u32_index(const struct device_node *np,
307 const char *propname,
308 u32 index, u32 *out_value);
309 extern int of_property_read_u64_index(const struct device_node *np,
310 const char *propname,
311 u32 index, u64 *out_value);
312 extern int of_property_read_variable_u8_array(const struct device_node *np,
313 const char *propname, u8 *out_values,
314 size_t sz_min, size_t sz_max);
315 extern int of_property_read_variable_u16_array(const struct device_node *np,
316 const char *propname, u16 *out_values,
317 size_t sz_min, size_t sz_max);
318 extern int of_property_read_variable_u32_array(const struct device_node *np,
319 const char *propname,
323 extern int of_property_read_u64(const struct device_node *np,
324 const char *propname, u64 *out_value);
325 extern int of_property_read_variable_u64_array(const struct device_node *np,
326 const char *propname,
331 extern int of_property_read_string(const struct device_node *np,
332 const char *propname,
333 const char **out_string);
334 extern int of_property_match_string(const struct device_node *np,
335 const char *propname,
337 extern int of_property_read_string_helper(const struct device_node *np,
338 const char *propname,
339 const char **out_strs, size_t sz, int index);
340 extern int of_device_is_compatible(const struct device_node *device,
342 extern int of_device_compatible_match(struct device_node *device,
343 const char *const *compat);
344 extern bool of_device_is_available(const struct device_node *device);
345 extern bool of_device_is_big_endian(const struct device_node *device);
346 extern const void *of_get_property(const struct device_node *node,
349 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
350 #define for_each_property_of_node(dn, pp) \
351 for (pp = dn->properties; pp != NULL; pp = pp->next)
353 extern int of_n_addr_cells(struct device_node *np);
354 extern int of_n_size_cells(struct device_node *np);
355 extern const struct of_device_id *of_match_node(
356 const struct of_device_id *matches, const struct device_node *node);
357 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
358 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
359 extern struct device_node *of_parse_phandle(const struct device_node *np,
360 const char *phandle_name,
362 extern int of_parse_phandle_with_args(const struct device_node *np,
363 const char *list_name, const char *cells_name, int index,
364 struct of_phandle_args *out_args);
365 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
366 const char *list_name, int cells_count, int index,
367 struct of_phandle_args *out_args);
368 extern int of_count_phandle_with_args(const struct device_node *np,
369 const char *list_name, const char *cells_name);
371 /* phandle iterator functions */
372 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
373 const struct device_node *np,
374 const char *list_name,
375 const char *cells_name,
378 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
379 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
383 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
384 extern int of_alias_get_id(struct device_node *np, const char *stem);
385 extern int of_alias_get_highest_id(const char *stem);
387 extern int of_machine_is_compatible(const char *compat);
389 extern int of_add_property(struct device_node *np, struct property *prop);
390 extern int of_remove_property(struct device_node *np, struct property *prop);
391 extern int of_update_property(struct device_node *np, struct property *newprop);
393 /* For updating the device tree at runtime */
394 #define OF_RECONFIG_ATTACH_NODE 0x0001
395 #define OF_RECONFIG_DETACH_NODE 0x0002
396 #define OF_RECONFIG_ADD_PROPERTY 0x0003
397 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
398 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
400 extern int of_attach_node(struct device_node *);
401 extern int of_detach_node(struct device_node *);
403 #define of_match_ptr(_ptr) (_ptr)
406 * of_property_read_u8_array - Find and read an array of u8 from a property.
408 * @np: device node from which the property value is to be read.
409 * @propname: name of the property to be searched.
410 * @out_values: pointer to return value, modified only if return value is 0.
411 * @sz: number of array elements to read
413 * Search for a property in a device node and read 8-bit value(s) from
414 * it. Returns 0 on success, -EINVAL if the property does not exist,
415 * -ENODATA if property does not have a value, and -EOVERFLOW if the
416 * property data isn't large enough.
418 * dts entry of array should be like:
419 * property = /bits/ 8 <0x50 0x60 0x70>;
421 * The out_values is modified only if a valid u8 value can be decoded.
423 static inline int of_property_read_u8_array(const struct device_node *np,
424 const char *propname,
425 u8 *out_values, size_t sz)
427 int ret = of_property_read_variable_u8_array(np, propname, out_values,
436 * of_property_read_u16_array - Find and read an array of u16 from a property.
438 * @np: device node from which the property value is to be read.
439 * @propname: name of the property to be searched.
440 * @out_values: pointer to return value, modified only if return value is 0.
441 * @sz: number of array elements to read
443 * Search for a property in a device node and read 16-bit value(s) from
444 * it. Returns 0 on success, -EINVAL if the property does not exist,
445 * -ENODATA if property does not have a value, and -EOVERFLOW if the
446 * property data isn't large enough.
448 * dts entry of array should be like:
449 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
451 * The out_values is modified only if a valid u16 value can be decoded.
453 static inline int of_property_read_u16_array(const struct device_node *np,
454 const char *propname,
455 u16 *out_values, size_t sz)
457 int ret = of_property_read_variable_u16_array(np, propname, out_values,
466 * of_property_read_u32_array - Find and read an array of 32 bit integers
469 * @np: device node from which the property value is to be read.
470 * @propname: name of the property to be searched.
471 * @out_values: pointer to return value, modified only if return value is 0.
472 * @sz: number of array elements to read
474 * Search for a property in a device node and read 32-bit value(s) from
475 * it. Returns 0 on success, -EINVAL if the property does not exist,
476 * -ENODATA if property does not have a value, and -EOVERFLOW if the
477 * property data isn't large enough.
479 * The out_values is modified only if a valid u32 value can be decoded.
481 static inline int of_property_read_u32_array(const struct device_node *np,
482 const char *propname,
483 u32 *out_values, size_t sz)
485 int ret = of_property_read_variable_u32_array(np, propname, out_values,
494 * of_property_read_u64_array - Find and read an array of 64 bit integers
497 * @np: device node from which the property value is to be read.
498 * @propname: name of the property to be searched.
499 * @out_values: pointer to return value, modified only if return value is 0.
500 * @sz: number of array elements to read
502 * Search for a property in a device node and read 64-bit value(s) from
503 * it. Returns 0 on success, -EINVAL if the property does not exist,
504 * -ENODATA if property does not have a value, and -EOVERFLOW if the
505 * property data isn't large enough.
507 * The out_values is modified only if a valid u64 value can be decoded.
509 static inline int of_property_read_u64_array(const struct device_node *np,
510 const char *propname,
511 u64 *out_values, size_t sz)
513 int ret = of_property_read_variable_u64_array(np, propname, out_values,
522 * struct property *prop;
526 * of_property_for_each_u32(np, "propname", prop, p, u)
527 * printk("U32 value: %x\n", u);
529 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
532 * struct property *prop;
535 * of_property_for_each_string(np, "propname", prop, s)
536 * printk("String value: %s\n", s);
538 const char *of_prop_next_string(struct property *prop, const char *cur);
540 bool of_console_check(struct device_node *dn, char *name, int index);
542 #else /* CONFIG_OF */
544 static inline void of_core_init(void)
548 static inline bool is_of_node(const struct fwnode_handle *fwnode)
553 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
558 static inline const char* of_node_full_name(const struct device_node *np)
563 static inline struct device_node *of_find_node_by_name(struct device_node *from,
569 static inline struct device_node *of_find_node_by_type(struct device_node *from,
575 static inline struct device_node *of_find_matching_node_and_match(
576 struct device_node *from,
577 const struct of_device_id *matches,
578 const struct of_device_id **match)
583 static inline struct device_node *of_find_node_by_path(const char *path)
588 static inline struct device_node *of_find_node_opts_by_path(const char *path,
594 static inline struct device_node *of_find_node_by_phandle(phandle handle)
599 static inline struct device_node *of_get_parent(const struct device_node *node)
604 static inline struct device_node *of_get_next_child(
605 const struct device_node *node, struct device_node *prev)
610 static inline struct device_node *of_get_next_available_child(
611 const struct device_node *node, struct device_node *prev)
616 static inline struct device_node *of_find_node_with_property(
617 struct device_node *from, const char *prop_name)
622 #define of_fwnode_handle(node) NULL
624 static inline bool of_have_populated_dt(void)
629 static inline struct device_node *of_get_child_by_name(
630 const struct device_node *node,
636 static inline int of_device_is_compatible(const struct device_node *device,
642 static inline bool of_device_is_available(const struct device_node *device)
647 static inline bool of_device_is_big_endian(const struct device_node *device)
652 static inline struct property *of_find_property(const struct device_node *np,
659 static inline struct device_node *of_find_compatible_node(
660 struct device_node *from,
667 static inline int of_property_count_elems_of_size(const struct device_node *np,
668 const char *propname, int elem_size)
673 static inline int of_property_read_u32_index(const struct device_node *np,
674 const char *propname, u32 index, u32 *out_value)
679 static inline int of_property_read_u8_array(const struct device_node *np,
680 const char *propname, u8 *out_values, size_t sz)
685 static inline int of_property_read_u16_array(const struct device_node *np,
686 const char *propname, u16 *out_values, size_t sz)
691 static inline int of_property_read_u32_array(const struct device_node *np,
692 const char *propname,
693 u32 *out_values, size_t sz)
698 static inline int of_property_read_u64_array(const struct device_node *np,
699 const char *propname,
700 u64 *out_values, size_t sz)
705 static inline int of_property_read_string(const struct device_node *np,
706 const char *propname,
707 const char **out_string)
712 static inline int of_property_read_string_helper(const struct device_node *np,
713 const char *propname,
714 const char **out_strs, size_t sz, int index)
719 static inline const void *of_get_property(const struct device_node *node,
726 static inline struct device_node *of_get_cpu_node(int cpu,
727 unsigned int *thread)
732 static inline int of_property_read_u64(const struct device_node *np,
733 const char *propname, u64 *out_value)
738 static inline int of_property_match_string(const struct device_node *np,
739 const char *propname,
745 static inline struct device_node *of_parse_phandle(const struct device_node *np,
746 const char *phandle_name,
752 static inline int of_parse_phandle_with_args(const struct device_node *np,
753 const char *list_name,
754 const char *cells_name,
756 struct of_phandle_args *out_args)
761 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
762 const char *list_name, int cells_count, int index,
763 struct of_phandle_args *out_args)
768 static inline int of_count_phandle_with_args(struct device_node *np,
769 const char *list_name,
770 const char *cells_name)
775 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
776 const struct device_node *np,
777 const char *list_name,
778 const char *cells_name,
784 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
789 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
796 static inline int of_alias_get_id(struct device_node *np, const char *stem)
801 static inline int of_alias_get_highest_id(const char *stem)
806 static inline int of_machine_is_compatible(const char *compat)
811 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
816 static inline const __be32 *of_prop_next_u32(struct property *prop,
817 const __be32 *cur, u32 *pu)
822 static inline const char *of_prop_next_string(struct property *prop,
828 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
833 static inline int of_node_test_and_set_flag(struct device_node *n,
839 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
843 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
847 static inline int of_property_check_flag(struct property *p, unsigned long flag)
852 static inline void of_property_set_flag(struct property *p, unsigned long flag)
856 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
860 #define of_match_ptr(_ptr) NULL
861 #define of_match_node(_matches, _node) NULL
862 #endif /* CONFIG_OF */
864 /* Default string compare functions, Allow arch asm/prom.h to override */
865 #if !defined(of_compat_cmp)
866 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
867 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
868 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
871 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
872 extern int of_node_to_nid(struct device_node *np);
874 static inline int of_node_to_nid(struct device_node *device)
880 #ifdef CONFIG_OF_NUMA
881 extern int of_numa_init(void);
883 static inline int of_numa_init(void)
889 static inline struct device_node *of_find_matching_node(
890 struct device_node *from,
891 const struct of_device_id *matches)
893 return of_find_matching_node_and_match(from, matches, NULL);
897 * of_property_count_u8_elems - Count the number of u8 elements in a property
899 * @np: device node from which the property value is to be read.
900 * @propname: name of the property to be searched.
902 * Search for a property in a device node and count the number of u8 elements
903 * in it. Returns number of elements on sucess, -EINVAL if the property does
904 * not exist or its length does not match a multiple of u8 and -ENODATA if the
905 * property does not have a value.
907 static inline int of_property_count_u8_elems(const struct device_node *np,
908 const char *propname)
910 return of_property_count_elems_of_size(np, propname, sizeof(u8));
914 * of_property_count_u16_elems - Count the number of u16 elements in a property
916 * @np: device node from which the property value is to be read.
917 * @propname: name of the property to be searched.
919 * Search for a property in a device node and count the number of u16 elements
920 * in it. Returns number of elements on sucess, -EINVAL if the property does
921 * not exist or its length does not match a multiple of u16 and -ENODATA if the
922 * property does not have a value.
924 static inline int of_property_count_u16_elems(const struct device_node *np,
925 const char *propname)
927 return of_property_count_elems_of_size(np, propname, sizeof(u16));
931 * of_property_count_u32_elems - Count the number of u32 elements in a property
933 * @np: device node from which the property value is to be read.
934 * @propname: name of the property to be searched.
936 * Search for a property in a device node and count the number of u32 elements
937 * in it. Returns number of elements on sucess, -EINVAL if the property does
938 * not exist or its length does not match a multiple of u32 and -ENODATA if the
939 * property does not have a value.
941 static inline int of_property_count_u32_elems(const struct device_node *np,
942 const char *propname)
944 return of_property_count_elems_of_size(np, propname, sizeof(u32));
948 * of_property_count_u64_elems - Count the number of u64 elements in a property
950 * @np: device node from which the property value is to be read.
951 * @propname: name of the property to be searched.
953 * Search for a property in a device node and count the number of u64 elements
954 * in it. Returns number of elements on sucess, -EINVAL if the property does
955 * not exist or its length does not match a multiple of u64 and -ENODATA if the
956 * property does not have a value.
958 static inline int of_property_count_u64_elems(const struct device_node *np,
959 const char *propname)
961 return of_property_count_elems_of_size(np, propname, sizeof(u64));
965 * of_property_read_string_array() - Read an array of strings from a multiple
967 * @np: device node from which the property value is to be read.
968 * @propname: name of the property to be searched.
969 * @out_strs: output array of string pointers.
970 * @sz: number of array elements to read.
972 * Search for a property in a device tree node and retrieve a list of
973 * terminated string values (pointer to data, not a copy) in that property.
975 * If @out_strs is NULL, the number of strings in the property is returned.
977 static inline int of_property_read_string_array(const struct device_node *np,
978 const char *propname, const char **out_strs,
981 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
985 * of_property_count_strings() - Find and return the number of strings from a
986 * multiple strings property.
987 * @np: device node from which the property value is to be read.
988 * @propname: name of the property to be searched.
990 * Search for a property in a device tree node and retrieve the number of null
991 * terminated string contain in it. Returns the number of strings on
992 * success, -EINVAL if the property does not exist, -ENODATA if property
993 * does not have a value, and -EILSEQ if the string is not null-terminated
994 * within the length of the property data.
996 static inline int of_property_count_strings(const struct device_node *np,
997 const char *propname)
999 return of_property_read_string_helper(np, propname, NULL, 0, 0);
1003 * of_property_read_string_index() - Find and read a string from a multiple
1005 * @np: device node from which the property value is to be read.
1006 * @propname: name of the property to be searched.
1007 * @index: index of the string in the list of strings
1008 * @out_string: pointer to null terminated return string, modified only if
1009 * return value is 0.
1011 * Search for a property in a device tree node and retrieve a null
1012 * terminated string value (pointer to data, not a copy) in the list of strings
1013 * contained in that property.
1014 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1015 * property does not have a value, and -EILSEQ if the string is not
1016 * null-terminated within the length of the property data.
1018 * The out_string pointer is modified only if a valid string can be decoded.
1020 static inline int of_property_read_string_index(const struct device_node *np,
1021 const char *propname,
1022 int index, const char **output)
1024 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1025 return rc < 0 ? rc : 0;
1029 * of_property_read_bool - Findfrom a property
1030 * @np: device node from which the property value is to be read.
1031 * @propname: name of the property to be searched.
1033 * Search for a property in a device node.
1034 * Returns true if the property exists false otherwise.
1036 static inline bool of_property_read_bool(const struct device_node *np,
1037 const char *propname)
1039 struct property *prop = of_find_property(np, propname, NULL);
1041 return prop ? true : false;
1044 static inline int of_property_read_u8(const struct device_node *np,
1045 const char *propname,
1048 return of_property_read_u8_array(np, propname, out_value, 1);
1051 static inline int of_property_read_u16(const struct device_node *np,
1052 const char *propname,
1055 return of_property_read_u16_array(np, propname, out_value, 1);
1058 static inline int of_property_read_u32(const struct device_node *np,
1059 const char *propname,
1062 return of_property_read_u32_array(np, propname, out_value, 1);
1065 static inline int of_property_read_s32(const struct device_node *np,
1066 const char *propname,
1069 return of_property_read_u32(np, propname, (u32*) out_value);
1072 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1073 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1074 err = of_phandle_iterator_next(it); \
1076 err = of_phandle_iterator_next(it))
1078 #define of_property_for_each_u32(np, propname, prop, p, u) \
1079 for (prop = of_find_property(np, propname, NULL), \
1080 p = of_prop_next_u32(prop, NULL, &u); \
1082 p = of_prop_next_u32(prop, p, &u))
1084 #define of_property_for_each_string(np, propname, prop, s) \
1085 for (prop = of_find_property(np, propname, NULL), \
1086 s = of_prop_next_string(prop, NULL); \
1088 s = of_prop_next_string(prop, s))
1090 #define for_each_node_by_name(dn, name) \
1091 for (dn = of_find_node_by_name(NULL, name); dn; \
1092 dn = of_find_node_by_name(dn, name))
1093 #define for_each_node_by_type(dn, type) \
1094 for (dn = of_find_node_by_type(NULL, type); dn; \
1095 dn = of_find_node_by_type(dn, type))
1096 #define for_each_compatible_node(dn, type, compatible) \
1097 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1098 dn = of_find_compatible_node(dn, type, compatible))
1099 #define for_each_matching_node(dn, matches) \
1100 for (dn = of_find_matching_node(NULL, matches); dn; \
1101 dn = of_find_matching_node(dn, matches))
1102 #define for_each_matching_node_and_match(dn, matches, match) \
1103 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1104 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1106 #define for_each_child_of_node(parent, child) \
1107 for (child = of_get_next_child(parent, NULL); child != NULL; \
1108 child = of_get_next_child(parent, child))
1109 #define for_each_available_child_of_node(parent, child) \
1110 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1111 child = of_get_next_available_child(parent, child))
1113 #define for_each_node_with_property(dn, prop_name) \
1114 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1115 dn = of_find_node_with_property(dn, prop_name))
1117 static inline int of_get_child_count(const struct device_node *np)
1119 struct device_node *child;
1122 for_each_child_of_node(np, child)
1128 static inline int of_get_available_child_count(const struct device_node *np)
1130 struct device_node *child;
1133 for_each_available_child_of_node(np, child)
1139 #if defined(CONFIG_OF) && !defined(MODULE)
1140 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1141 static const struct of_device_id __of_table_##name \
1142 __used __section(__##table##_of_table) \
1143 = { .compatible = compat, \
1144 .data = (fn == (fn_type)NULL) ? fn : fn }
1146 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1147 static const struct of_device_id __of_table_##name \
1148 __attribute__((unused)) \
1149 = { .compatible = compat, \
1150 .data = (fn == (fn_type)NULL) ? fn : fn }
1153 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1154 typedef int (*of_init_fn_1_ret)(struct device_node *);
1155 typedef void (*of_init_fn_1)(struct device_node *);
1157 #define OF_DECLARE_1(table, name, compat, fn) \
1158 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1159 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1160 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1161 #define OF_DECLARE_2(table, name, compat, fn) \
1162 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1165 * struct of_changeset_entry - Holds a changeset entry
1167 * @node: list_head for the log list
1168 * @action: notifier action
1169 * @np: pointer to the device node affected
1170 * @prop: pointer to the property affected
1171 * @old_prop: hold a pointer to the original property
1173 * Every modification of the device tree during a changeset
1174 * is held in a list of of_changeset_entry structures.
1175 * That way we can recover from a partial application, or we can
1176 * revert the changeset
1178 struct of_changeset_entry {
1179 struct list_head node;
1180 unsigned long action;
1181 struct device_node *np;
1182 struct property *prop;
1183 struct property *old_prop;
1187 * struct of_changeset - changeset tracker structure
1189 * @entries: list_head for the changeset entries
1191 * changesets are a convenient way to apply bulk changes to the
1192 * live tree. In case of an error, changes are rolled-back.
1193 * changesets live on after initial application, and if not
1194 * destroyed after use, they can be reverted in one single call.
1196 struct of_changeset {
1197 struct list_head entries;
1200 enum of_reconfig_change {
1201 OF_RECONFIG_NO_CHANGE = 0,
1202 OF_RECONFIG_CHANGE_ADD,
1203 OF_RECONFIG_CHANGE_REMOVE,
1206 #ifdef CONFIG_OF_DYNAMIC
1207 extern int of_reconfig_notifier_register(struct notifier_block *);
1208 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1209 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1210 extern int of_reconfig_get_state_change(unsigned long action,
1211 struct of_reconfig_data *arg);
1213 extern void of_changeset_init(struct of_changeset *ocs);
1214 extern void of_changeset_destroy(struct of_changeset *ocs);
1215 extern int of_changeset_apply(struct of_changeset *ocs);
1216 extern int of_changeset_revert(struct of_changeset *ocs);
1217 extern int of_changeset_action(struct of_changeset *ocs,
1218 unsigned long action, struct device_node *np,
1219 struct property *prop);
1221 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1222 struct device_node *np)
1224 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1227 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1228 struct device_node *np)
1230 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1233 static inline int of_changeset_add_property(struct of_changeset *ocs,
1234 struct device_node *np, struct property *prop)
1236 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1239 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1240 struct device_node *np, struct property *prop)
1242 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1245 static inline int of_changeset_update_property(struct of_changeset *ocs,
1246 struct device_node *np, struct property *prop)
1248 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1250 #else /* CONFIG_OF_DYNAMIC */
1251 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1255 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1259 static inline int of_reconfig_notify(unsigned long action,
1260 struct of_reconfig_data *arg)
1264 static inline int of_reconfig_get_state_change(unsigned long action,
1265 struct of_reconfig_data *arg)
1269 #endif /* CONFIG_OF_DYNAMIC */
1271 /* CONFIG_OF_RESOLVE api */
1272 extern int of_resolve_phandles(struct device_node *tree);
1275 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1276 * @np: Pointer to the given device_node
1278 * return true if present false otherwise
1280 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1282 return of_property_read_bool(np, "system-power-controller");
1289 enum of_overlay_notify_action {
1290 OF_OVERLAY_PRE_APPLY,
1291 OF_OVERLAY_POST_APPLY,
1292 OF_OVERLAY_PRE_REMOVE,
1293 OF_OVERLAY_POST_REMOVE,
1296 struct of_overlay_notify_data {
1297 struct device_node *overlay;
1298 struct device_node *target;
1301 #ifdef CONFIG_OF_OVERLAY
1303 /* ID based overlays; the API for external users */
1304 int of_overlay_create(struct device_node *tree);
1305 int of_overlay_destroy(int id);
1306 int of_overlay_destroy_all(void);
1308 int of_overlay_notifier_register(struct notifier_block *nb);
1309 int of_overlay_notifier_unregister(struct notifier_block *nb);
1313 static inline int of_overlay_create(struct device_node *tree)
1318 static inline int of_overlay_destroy(int id)
1323 static inline int of_overlay_destroy_all(void)
1328 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1333 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1340 #endif /* _LINUX_OF_H */