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_variable_u8_array(const struct device_node *np,
296 const char *propname, u8 *out_values,
297 size_t sz_min, size_t sz_max);
298 extern int of_property_read_variable_u16_array(const struct device_node *np,
299 const char *propname, u16 *out_values,
300 size_t sz_min, size_t sz_max);
301 extern int of_property_read_variable_u32_array(const struct device_node *np,
302 const char *propname,
306 extern int of_property_read_u64(const struct device_node *np,
307 const char *propname, u64 *out_value);
308 extern int of_property_read_variable_u64_array(const struct device_node *np,
309 const char *propname,
314 extern int of_property_read_string(const struct device_node *np,
315 const char *propname,
316 const char **out_string);
317 extern int of_property_match_string(const struct device_node *np,
318 const char *propname,
320 extern int of_property_read_string_helper(const struct device_node *np,
321 const char *propname,
322 const char **out_strs, size_t sz, int index);
323 extern int of_device_is_compatible(const struct device_node *device,
325 extern int of_device_compatible_match(struct device_node *device,
326 const char *const *compat);
327 extern bool of_device_is_available(const struct device_node *device);
328 extern bool of_device_is_big_endian(const struct device_node *device);
329 extern const void *of_get_property(const struct device_node *node,
332 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
333 #define for_each_property_of_node(dn, pp) \
334 for (pp = dn->properties; pp != NULL; pp = pp->next)
336 extern int of_n_addr_cells(struct device_node *np);
337 extern int of_n_size_cells(struct device_node *np);
338 extern const struct of_device_id *of_match_node(
339 const struct of_device_id *matches, const struct device_node *node);
340 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
341 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
342 extern struct device_node *of_parse_phandle(const struct device_node *np,
343 const char *phandle_name,
345 extern int of_parse_phandle_with_args(const struct device_node *np,
346 const char *list_name, const char *cells_name, int index,
347 struct of_phandle_args *out_args);
348 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
349 const char *list_name, int cells_count, int index,
350 struct of_phandle_args *out_args);
351 extern int of_count_phandle_with_args(const struct device_node *np,
352 const char *list_name, const char *cells_name);
354 /* phandle iterator functions */
355 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
356 const struct device_node *np,
357 const char *list_name,
358 const char *cells_name,
361 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
362 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
366 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
367 extern int of_alias_get_id(struct device_node *np, const char *stem);
368 extern int of_alias_get_highest_id(const char *stem);
370 extern int of_machine_is_compatible(const char *compat);
372 extern int of_add_property(struct device_node *np, struct property *prop);
373 extern int of_remove_property(struct device_node *np, struct property *prop);
374 extern int of_update_property(struct device_node *np, struct property *newprop);
376 /* For updating the device tree at runtime */
377 #define OF_RECONFIG_ATTACH_NODE 0x0001
378 #define OF_RECONFIG_DETACH_NODE 0x0002
379 #define OF_RECONFIG_ADD_PROPERTY 0x0003
380 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
381 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
383 extern int of_attach_node(struct device_node *);
384 extern int of_detach_node(struct device_node *);
386 #define of_match_ptr(_ptr) (_ptr)
389 * of_property_read_u8_array - Find and read an array of u8 from a property.
391 * @np: device node from which the property value is to be read.
392 * @propname: name of the property to be searched.
393 * @out_values: pointer to return value, modified only if return value is 0.
394 * @sz: number of array elements to read
396 * Search for a property in a device node and read 8-bit value(s) from
397 * it. Returns 0 on success, -EINVAL if the property does not exist,
398 * -ENODATA if property does not have a value, and -EOVERFLOW if the
399 * property data isn't large enough.
401 * dts entry of array should be like:
402 * property = /bits/ 8 <0x50 0x60 0x70>;
404 * The out_values is modified only if a valid u8 value can be decoded.
406 static inline int of_property_read_u8_array(const struct device_node *np,
407 const char *propname,
408 u8 *out_values, size_t sz)
410 int ret = of_property_read_variable_u8_array(np, propname, out_values,
419 * of_property_read_u16_array - Find and read an array of u16 from a property.
421 * @np: device node from which the property value is to be read.
422 * @propname: name of the property to be searched.
423 * @out_values: pointer to return value, modified only if return value is 0.
424 * @sz: number of array elements to read
426 * Search for a property in a device node and read 16-bit value(s) from
427 * it. Returns 0 on success, -EINVAL if the property does not exist,
428 * -ENODATA if property does not have a value, and -EOVERFLOW if the
429 * property data isn't large enough.
431 * dts entry of array should be like:
432 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
434 * The out_values is modified only if a valid u16 value can be decoded.
436 static inline int of_property_read_u16_array(const struct device_node *np,
437 const char *propname,
438 u16 *out_values, size_t sz)
440 int ret = of_property_read_variable_u16_array(np, propname, out_values,
449 * of_property_read_u32_array - Find and read an array of 32 bit integers
452 * @np: device node from which the property value is to be read.
453 * @propname: name of the property to be searched.
454 * @out_values: pointer to return value, modified only if return value is 0.
455 * @sz: number of array elements to read
457 * Search for a property in a device node and read 32-bit value(s) from
458 * it. Returns 0 on success, -EINVAL if the property does not exist,
459 * -ENODATA if property does not have a value, and -EOVERFLOW if the
460 * property data isn't large enough.
462 * The out_values is modified only if a valid u32 value can be decoded.
464 static inline int of_property_read_u32_array(const struct device_node *np,
465 const char *propname,
466 u32 *out_values, size_t sz)
468 int ret = of_property_read_variable_u32_array(np, propname, out_values,
477 * of_property_read_u64_array - Find and read an array of 64 bit integers
480 * @np: device node from which the property value is to be read.
481 * @propname: name of the property to be searched.
482 * @out_values: pointer to return value, modified only if return value is 0.
483 * @sz: number of array elements to read
485 * Search for a property in a device node and read 64-bit value(s) from
486 * it. Returns 0 on success, -EINVAL if the property does not exist,
487 * -ENODATA if property does not have a value, and -EOVERFLOW if the
488 * property data isn't large enough.
490 * The out_values is modified only if a valid u64 value can be decoded.
492 static inline int of_property_read_u64_array(const struct device_node *np,
493 const char *propname,
494 u64 *out_values, size_t sz)
496 int ret = of_property_read_variable_u64_array(np, propname, out_values,
505 * struct property *prop;
509 * of_property_for_each_u32(np, "propname", prop, p, u)
510 * printk("U32 value: %x\n", u);
512 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
515 * struct property *prop;
518 * of_property_for_each_string(np, "propname", prop, s)
519 * printk("String value: %s\n", s);
521 const char *of_prop_next_string(struct property *prop, const char *cur);
523 bool of_console_check(struct device_node *dn, char *name, int index);
525 #else /* CONFIG_OF */
527 static inline void of_core_init(void)
531 static inline bool is_of_node(struct fwnode_handle *fwnode)
536 static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
541 static inline const char* of_node_full_name(const struct device_node *np)
546 static inline struct device_node *of_find_node_by_name(struct device_node *from,
552 static inline struct device_node *of_find_node_by_type(struct device_node *from,
558 static inline struct device_node *of_find_matching_node_and_match(
559 struct device_node *from,
560 const struct of_device_id *matches,
561 const struct of_device_id **match)
566 static inline struct device_node *of_find_node_by_path(const char *path)
571 static inline struct device_node *of_find_node_opts_by_path(const char *path,
577 static inline struct device_node *of_find_node_by_phandle(phandle handle)
582 static inline struct device_node *of_get_parent(const struct device_node *node)
587 static inline struct device_node *of_get_next_child(
588 const struct device_node *node, struct device_node *prev)
593 static inline struct device_node *of_get_next_available_child(
594 const struct device_node *node, struct device_node *prev)
599 static inline struct device_node *of_find_node_with_property(
600 struct device_node *from, const char *prop_name)
605 static inline bool of_have_populated_dt(void)
610 static inline struct device_node *of_get_child_by_name(
611 const struct device_node *node,
617 static inline int of_device_is_compatible(const struct device_node *device,
623 static inline bool of_device_is_available(const struct device_node *device)
628 static inline bool of_device_is_big_endian(const struct device_node *device)
633 static inline struct property *of_find_property(const struct device_node *np,
640 static inline struct device_node *of_find_compatible_node(
641 struct device_node *from,
648 static inline int of_property_count_elems_of_size(const struct device_node *np,
649 const char *propname, int elem_size)
654 static inline int of_property_read_u32_index(const struct device_node *np,
655 const char *propname, u32 index, u32 *out_value)
660 static inline int of_property_read_u8_array(const struct device_node *np,
661 const char *propname, u8 *out_values, size_t sz)
666 static inline int of_property_read_u16_array(const struct device_node *np,
667 const char *propname, u16 *out_values, size_t sz)
672 static inline int of_property_read_u32_array(const struct device_node *np,
673 const char *propname,
674 u32 *out_values, size_t sz)
679 static inline int of_property_read_u64_array(const struct device_node *np,
680 const char *propname,
681 u64 *out_values, size_t sz)
686 static inline int of_property_read_string(const struct device_node *np,
687 const char *propname,
688 const char **out_string)
693 static inline int of_property_read_string_helper(const struct device_node *np,
694 const char *propname,
695 const char **out_strs, size_t sz, int index)
700 static inline const void *of_get_property(const struct device_node *node,
707 static inline struct device_node *of_get_cpu_node(int cpu,
708 unsigned int *thread)
713 static inline int of_property_read_u64(const struct device_node *np,
714 const char *propname, u64 *out_value)
719 static inline int of_property_match_string(const struct device_node *np,
720 const char *propname,
726 static inline struct device_node *of_parse_phandle(const struct device_node *np,
727 const char *phandle_name,
733 static inline int of_parse_phandle_with_args(const struct device_node *np,
734 const char *list_name,
735 const char *cells_name,
737 struct of_phandle_args *out_args)
742 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
743 const char *list_name, int cells_count, int index,
744 struct of_phandle_args *out_args)
749 static inline int of_count_phandle_with_args(struct device_node *np,
750 const char *list_name,
751 const char *cells_name)
756 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
757 const struct device_node *np,
758 const char *list_name,
759 const char *cells_name,
765 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
770 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
777 static inline int of_alias_get_id(struct device_node *np, const char *stem)
782 static inline int of_alias_get_highest_id(const char *stem)
787 static inline int of_machine_is_compatible(const char *compat)
792 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
797 static inline const __be32 *of_prop_next_u32(struct property *prop,
798 const __be32 *cur, u32 *pu)
803 static inline const char *of_prop_next_string(struct property *prop,
809 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
814 static inline int of_node_test_and_set_flag(struct device_node *n,
820 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
824 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
828 static inline int of_property_check_flag(struct property *p, unsigned long flag)
833 static inline void of_property_set_flag(struct property *p, unsigned long flag)
837 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
841 #define of_match_ptr(_ptr) NULL
842 #define of_match_node(_matches, _node) NULL
843 #endif /* CONFIG_OF */
845 /* Default string compare functions, Allow arch asm/prom.h to override */
846 #if !defined(of_compat_cmp)
847 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
848 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
849 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
852 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
853 extern int of_node_to_nid(struct device_node *np);
855 static inline int of_node_to_nid(struct device_node *device)
861 #ifdef CONFIG_OF_NUMA
862 extern int of_numa_init(void);
864 static inline int of_numa_init(void)
870 static inline struct device_node *of_find_matching_node(
871 struct device_node *from,
872 const struct of_device_id *matches)
874 return of_find_matching_node_and_match(from, matches, NULL);
878 * of_property_count_u8_elems - Count the number of u8 elements in a property
880 * @np: device node from which the property value is to be read.
881 * @propname: name of the property to be searched.
883 * Search for a property in a device node and count the number of u8 elements
884 * in it. Returns number of elements on sucess, -EINVAL if the property does
885 * not exist or its length does not match a multiple of u8 and -ENODATA if the
886 * property does not have a value.
888 static inline int of_property_count_u8_elems(const struct device_node *np,
889 const char *propname)
891 return of_property_count_elems_of_size(np, propname, sizeof(u8));
895 * of_property_count_u16_elems - Count the number of u16 elements in a property
897 * @np: device node from which the property value is to be read.
898 * @propname: name of the property to be searched.
900 * Search for a property in a device node and count the number of u16 elements
901 * in it. Returns number of elements on sucess, -EINVAL if the property does
902 * not exist or its length does not match a multiple of u16 and -ENODATA if the
903 * property does not have a value.
905 static inline int of_property_count_u16_elems(const struct device_node *np,
906 const char *propname)
908 return of_property_count_elems_of_size(np, propname, sizeof(u16));
912 * of_property_count_u32_elems - Count the number of u32 elements in a property
914 * @np: device node from which the property value is to be read.
915 * @propname: name of the property to be searched.
917 * Search for a property in a device node and count the number of u32 elements
918 * in it. Returns number of elements on sucess, -EINVAL if the property does
919 * not exist or its length does not match a multiple of u32 and -ENODATA if the
920 * property does not have a value.
922 static inline int of_property_count_u32_elems(const struct device_node *np,
923 const char *propname)
925 return of_property_count_elems_of_size(np, propname, sizeof(u32));
929 * of_property_count_u64_elems - Count the number of u64 elements in a property
931 * @np: device node from which the property value is to be read.
932 * @propname: name of the property to be searched.
934 * Search for a property in a device node and count the number of u64 elements
935 * in it. Returns number of elements on sucess, -EINVAL if the property does
936 * not exist or its length does not match a multiple of u64 and -ENODATA if the
937 * property does not have a value.
939 static inline int of_property_count_u64_elems(const struct device_node *np,
940 const char *propname)
942 return of_property_count_elems_of_size(np, propname, sizeof(u64));
946 * of_property_read_string_array() - Read an array of strings from a multiple
948 * @np: device node from which the property value is to be read.
949 * @propname: name of the property to be searched.
950 * @out_strs: output array of string pointers.
951 * @sz: number of array elements to read.
953 * Search for a property in a device tree node and retrieve a list of
954 * terminated string values (pointer to data, not a copy) in that property.
956 * If @out_strs is NULL, the number of strings in the property is returned.
958 static inline int of_property_read_string_array(const struct device_node *np,
959 const char *propname, const char **out_strs,
962 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
966 * of_property_count_strings() - Find and return the number of strings from a
967 * multiple strings property.
968 * @np: device node from which the property value is to be read.
969 * @propname: name of the property to be searched.
971 * Search for a property in a device tree node and retrieve the number of null
972 * terminated string contain in it. Returns the number of strings on
973 * success, -EINVAL if the property does not exist, -ENODATA if property
974 * does not have a value, and -EILSEQ if the string is not null-terminated
975 * within the length of the property data.
977 static inline int of_property_count_strings(const struct device_node *np,
978 const char *propname)
980 return of_property_read_string_helper(np, propname, NULL, 0, 0);
984 * of_property_read_string_index() - Find and read a string from a multiple
986 * @np: device node from which the property value is to be read.
987 * @propname: name of the property to be searched.
988 * @index: index of the string in the list of strings
989 * @out_string: pointer to null terminated return string, modified only if
992 * Search for a property in a device tree node and retrieve a null
993 * terminated string value (pointer to data, not a copy) in the list of strings
994 * contained in that property.
995 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
996 * property does not have a value, and -EILSEQ if the string is not
997 * null-terminated within the length of the property data.
999 * The out_string pointer is modified only if a valid string can be decoded.
1001 static inline int of_property_read_string_index(const struct device_node *np,
1002 const char *propname,
1003 int index, const char **output)
1005 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1006 return rc < 0 ? rc : 0;
1010 * of_property_read_bool - Findfrom a property
1011 * @np: device node from which the property value is to be read.
1012 * @propname: name of the property to be searched.
1014 * Search for a property in a device node.
1015 * Returns true if the property exists false otherwise.
1017 static inline bool of_property_read_bool(const struct device_node *np,
1018 const char *propname)
1020 struct property *prop = of_find_property(np, propname, NULL);
1022 return prop ? true : false;
1025 static inline int of_property_read_u8(const struct device_node *np,
1026 const char *propname,
1029 return of_property_read_u8_array(np, propname, out_value, 1);
1032 static inline int of_property_read_u16(const struct device_node *np,
1033 const char *propname,
1036 return of_property_read_u16_array(np, propname, out_value, 1);
1039 static inline int of_property_read_u32(const struct device_node *np,
1040 const char *propname,
1043 return of_property_read_u32_array(np, propname, out_value, 1);
1046 static inline int of_property_read_s32(const struct device_node *np,
1047 const char *propname,
1050 return of_property_read_u32(np, propname, (u32*) out_value);
1053 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1054 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1055 err = of_phandle_iterator_next(it); \
1057 err = of_phandle_iterator_next(it))
1059 #define of_property_for_each_u32(np, propname, prop, p, u) \
1060 for (prop = of_find_property(np, propname, NULL), \
1061 p = of_prop_next_u32(prop, NULL, &u); \
1063 p = of_prop_next_u32(prop, p, &u))
1065 #define of_property_for_each_string(np, propname, prop, s) \
1066 for (prop = of_find_property(np, propname, NULL), \
1067 s = of_prop_next_string(prop, NULL); \
1069 s = of_prop_next_string(prop, s))
1071 #define for_each_node_by_name(dn, name) \
1072 for (dn = of_find_node_by_name(NULL, name); dn; \
1073 dn = of_find_node_by_name(dn, name))
1074 #define for_each_node_by_type(dn, type) \
1075 for (dn = of_find_node_by_type(NULL, type); dn; \
1076 dn = of_find_node_by_type(dn, type))
1077 #define for_each_compatible_node(dn, type, compatible) \
1078 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1079 dn = of_find_compatible_node(dn, type, compatible))
1080 #define for_each_matching_node(dn, matches) \
1081 for (dn = of_find_matching_node(NULL, matches); dn; \
1082 dn = of_find_matching_node(dn, matches))
1083 #define for_each_matching_node_and_match(dn, matches, match) \
1084 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1085 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1087 #define for_each_child_of_node(parent, child) \
1088 for (child = of_get_next_child(parent, NULL); child != NULL; \
1089 child = of_get_next_child(parent, child))
1090 #define for_each_available_child_of_node(parent, child) \
1091 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1092 child = of_get_next_available_child(parent, child))
1094 #define for_each_node_with_property(dn, prop_name) \
1095 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1096 dn = of_find_node_with_property(dn, prop_name))
1098 static inline int of_get_child_count(const struct device_node *np)
1100 struct device_node *child;
1103 for_each_child_of_node(np, child)
1109 static inline int of_get_available_child_count(const struct device_node *np)
1111 struct device_node *child;
1114 for_each_available_child_of_node(np, child)
1120 #if defined(CONFIG_OF) && !defined(MODULE)
1121 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1122 static const struct of_device_id __of_table_##name \
1123 __used __section(__##table##_of_table) \
1124 = { .compatible = compat, \
1125 .data = (fn == (fn_type)NULL) ? fn : fn }
1127 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1128 static const struct of_device_id __of_table_##name \
1129 __attribute__((unused)) \
1130 = { .compatible = compat, \
1131 .data = (fn == (fn_type)NULL) ? fn : fn }
1134 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1135 typedef int (*of_init_fn_1_ret)(struct device_node *);
1136 typedef void (*of_init_fn_1)(struct device_node *);
1138 #define OF_DECLARE_1(table, name, compat, fn) \
1139 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1140 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1141 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1142 #define OF_DECLARE_2(table, name, compat, fn) \
1143 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1146 * struct of_changeset_entry - Holds a changeset entry
1148 * @node: list_head for the log list
1149 * @action: notifier action
1150 * @np: pointer to the device node affected
1151 * @prop: pointer to the property affected
1152 * @old_prop: hold a pointer to the original property
1154 * Every modification of the device tree during a changeset
1155 * is held in a list of of_changeset_entry structures.
1156 * That way we can recover from a partial application, or we can
1157 * revert the changeset
1159 struct of_changeset_entry {
1160 struct list_head node;
1161 unsigned long action;
1162 struct device_node *np;
1163 struct property *prop;
1164 struct property *old_prop;
1168 * struct of_changeset - changeset tracker structure
1170 * @entries: list_head for the changeset entries
1172 * changesets are a convenient way to apply bulk changes to the
1173 * live tree. In case of an error, changes are rolled-back.
1174 * changesets live on after initial application, and if not
1175 * destroyed after use, they can be reverted in one single call.
1177 struct of_changeset {
1178 struct list_head entries;
1181 enum of_reconfig_change {
1182 OF_RECONFIG_NO_CHANGE = 0,
1183 OF_RECONFIG_CHANGE_ADD,
1184 OF_RECONFIG_CHANGE_REMOVE,
1187 #ifdef CONFIG_OF_DYNAMIC
1188 extern int of_reconfig_notifier_register(struct notifier_block *);
1189 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1190 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1191 extern int of_reconfig_get_state_change(unsigned long action,
1192 struct of_reconfig_data *arg);
1194 extern void of_changeset_init(struct of_changeset *ocs);
1195 extern void of_changeset_destroy(struct of_changeset *ocs);
1196 extern int of_changeset_apply(struct of_changeset *ocs);
1197 extern int of_changeset_revert(struct of_changeset *ocs);
1198 extern int of_changeset_action(struct of_changeset *ocs,
1199 unsigned long action, struct device_node *np,
1200 struct property *prop);
1202 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1203 struct device_node *np)
1205 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1208 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1209 struct device_node *np)
1211 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1214 static inline int of_changeset_add_property(struct of_changeset *ocs,
1215 struct device_node *np, struct property *prop)
1217 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1220 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1221 struct device_node *np, struct property *prop)
1223 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1226 static inline int of_changeset_update_property(struct of_changeset *ocs,
1227 struct device_node *np, struct property *prop)
1229 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1231 #else /* CONFIG_OF_DYNAMIC */
1232 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1236 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1240 static inline int of_reconfig_notify(unsigned long action,
1241 struct of_reconfig_data *arg)
1245 static inline int of_reconfig_get_state_change(unsigned long action,
1246 struct of_reconfig_data *arg)
1250 #endif /* CONFIG_OF_DYNAMIC */
1252 /* CONFIG_OF_RESOLVE api */
1253 extern int of_resolve_phandles(struct device_node *tree);
1256 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1257 * @np: Pointer to the given device_node
1259 * return true if present false otherwise
1261 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1263 return of_property_read_bool(np, "system-power-controller");
1270 enum of_overlay_notify_action {
1271 OF_OVERLAY_PRE_APPLY,
1272 OF_OVERLAY_POST_APPLY,
1273 OF_OVERLAY_PRE_REMOVE,
1274 OF_OVERLAY_POST_REMOVE,
1277 struct of_overlay_notify_data {
1278 struct device_node *overlay;
1279 struct device_node *target;
1282 #ifdef CONFIG_OF_OVERLAY
1284 /* ID based overlays; the API for external users */
1285 int of_overlay_create(struct device_node *tree);
1286 int of_overlay_destroy(int id);
1287 int of_overlay_destroy_all(void);
1289 int of_overlay_notifier_register(struct notifier_block *nb);
1290 int of_overlay_notifier_unregister(struct notifier_block *nb);
1294 static inline int of_overlay_create(struct device_node *tree)
1299 static inline int of_overlay_destroy(int id)
1304 static inline int of_overlay_destroy_all(void)
1309 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1314 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1321 #endif /* _LINUX_OF_H */