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 #define of_fwnode_handle(node) (&(node)->fwnode)
164 static inline bool of_have_populated_dt(void)
166 return of_root != NULL;
169 static inline bool of_node_is_root(const struct device_node *node)
171 return node && (node->parent == NULL);
174 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
176 return test_bit(flag, &n->_flags);
179 static inline int of_node_test_and_set_flag(struct device_node *n,
182 return test_and_set_bit(flag, &n->_flags);
185 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
187 set_bit(flag, &n->_flags);
190 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
192 clear_bit(flag, &n->_flags);
195 static inline int of_property_check_flag(struct property *p, unsigned long flag)
197 return test_bit(flag, &p->_flags);
200 static inline void of_property_set_flag(struct property *p, unsigned long flag)
202 set_bit(flag, &p->_flags);
205 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
207 clear_bit(flag, &p->_flags);
210 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
211 extern struct device_node *of_find_all_nodes(struct device_node *prev);
214 * OF address retrieval & translation
217 /* Helper to read a big number; size is in cells (not bytes) */
218 static inline u64 of_read_number(const __be32 *cell, int size)
222 r = (r << 32) | be32_to_cpu(*(cell++));
226 /* Like of_read_number, but we want an unsigned long result */
227 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
229 /* toss away upper bits if unsigned long is smaller than u64 */
230 return of_read_number(cell, size);
233 #if defined(CONFIG_SPARC)
234 #include <asm/prom.h>
237 /* Default #address and #size cells. Allow arch asm/prom.h to override */
238 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
239 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
240 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
243 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
244 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
246 static inline const char *of_node_full_name(const struct device_node *np)
248 return np ? np->full_name : "<no-node>";
251 #define for_each_of_allnodes_from(from, dn) \
252 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
253 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
254 extern struct device_node *of_find_node_by_name(struct device_node *from,
256 extern struct device_node *of_find_node_by_type(struct device_node *from,
258 extern struct device_node *of_find_compatible_node(struct device_node *from,
259 const char *type, const char *compat);
260 extern struct device_node *of_find_matching_node_and_match(
261 struct device_node *from,
262 const struct of_device_id *matches,
263 const struct of_device_id **match);
265 extern struct device_node *of_find_node_opts_by_path(const char *path,
267 static inline struct device_node *of_find_node_by_path(const char *path)
269 return of_find_node_opts_by_path(path, NULL);
272 extern struct device_node *of_find_node_by_phandle(phandle handle);
273 extern struct device_node *of_get_parent(const struct device_node *node);
274 extern struct device_node *of_get_next_parent(struct device_node *node);
275 extern struct device_node *of_get_next_child(const struct device_node *node,
276 struct device_node *prev);
277 extern struct device_node *of_get_next_available_child(
278 const struct device_node *node, struct device_node *prev);
280 extern struct device_node *of_get_child_by_name(const struct device_node *node,
284 extern struct device_node *of_find_next_cache_node(const struct device_node *);
285 extern int of_find_last_cache_level(unsigned int cpu);
286 extern struct device_node *of_find_node_with_property(
287 struct device_node *from, const char *prop_name);
289 extern struct property *of_find_property(const struct device_node *np,
292 extern int of_property_count_elems_of_size(const struct device_node *np,
293 const char *propname, int elem_size);
294 extern int of_property_read_u32_index(const struct device_node *np,
295 const char *propname,
296 u32 index, u32 *out_value);
297 extern int of_property_read_variable_u8_array(const struct device_node *np,
298 const char *propname, u8 *out_values,
299 size_t sz_min, size_t sz_max);
300 extern int of_property_read_variable_u16_array(const struct device_node *np,
301 const char *propname, u16 *out_values,
302 size_t sz_min, size_t sz_max);
303 extern int of_property_read_variable_u32_array(const struct device_node *np,
304 const char *propname,
308 extern int of_property_read_u64(const struct device_node *np,
309 const char *propname, u64 *out_value);
310 extern int of_property_read_variable_u64_array(const struct device_node *np,
311 const char *propname,
316 extern int of_property_read_string(const struct device_node *np,
317 const char *propname,
318 const char **out_string);
319 extern int of_property_match_string(const struct device_node *np,
320 const char *propname,
322 extern int of_property_read_string_helper(const struct device_node *np,
323 const char *propname,
324 const char **out_strs, size_t sz, int index);
325 extern int of_device_is_compatible(const struct device_node *device,
327 extern int of_device_compatible_match(struct device_node *device,
328 const char *const *compat);
329 extern bool of_device_is_available(const struct device_node *device);
330 extern bool of_device_is_big_endian(const struct device_node *device);
331 extern const void *of_get_property(const struct device_node *node,
334 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
335 #define for_each_property_of_node(dn, pp) \
336 for (pp = dn->properties; pp != NULL; pp = pp->next)
338 extern int of_n_addr_cells(struct device_node *np);
339 extern int of_n_size_cells(struct device_node *np);
340 extern const struct of_device_id *of_match_node(
341 const struct of_device_id *matches, const struct device_node *node);
342 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
343 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
344 extern struct device_node *of_parse_phandle(const struct device_node *np,
345 const char *phandle_name,
347 extern int of_parse_phandle_with_args(const struct device_node *np,
348 const char *list_name, const char *cells_name, int index,
349 struct of_phandle_args *out_args);
350 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
351 const char *list_name, int cells_count, int index,
352 struct of_phandle_args *out_args);
353 extern int of_count_phandle_with_args(const struct device_node *np,
354 const char *list_name, const char *cells_name);
356 /* phandle iterator functions */
357 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
358 const struct device_node *np,
359 const char *list_name,
360 const char *cells_name,
363 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
364 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
368 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
369 extern int of_alias_get_id(struct device_node *np, const char *stem);
370 extern int of_alias_get_highest_id(const char *stem);
372 extern int of_machine_is_compatible(const char *compat);
374 extern int of_add_property(struct device_node *np, struct property *prop);
375 extern int of_remove_property(struct device_node *np, struct property *prop);
376 extern int of_update_property(struct device_node *np, struct property *newprop);
378 /* For updating the device tree at runtime */
379 #define OF_RECONFIG_ATTACH_NODE 0x0001
380 #define OF_RECONFIG_DETACH_NODE 0x0002
381 #define OF_RECONFIG_ADD_PROPERTY 0x0003
382 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
383 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
385 extern int of_attach_node(struct device_node *);
386 extern int of_detach_node(struct device_node *);
388 #define of_match_ptr(_ptr) (_ptr)
391 * of_property_read_u8_array - Find and read an array of u8 from a property.
393 * @np: device node from which the property value is to be read.
394 * @propname: name of the property to be searched.
395 * @out_values: pointer to return value, modified only if return value is 0.
396 * @sz: number of array elements to read
398 * Search for a property in a device node and read 8-bit value(s) from
399 * it. Returns 0 on success, -EINVAL if the property does not exist,
400 * -ENODATA if property does not have a value, and -EOVERFLOW if the
401 * property data isn't large enough.
403 * dts entry of array should be like:
404 * property = /bits/ 8 <0x50 0x60 0x70>;
406 * The out_values is modified only if a valid u8 value can be decoded.
408 static inline int of_property_read_u8_array(const struct device_node *np,
409 const char *propname,
410 u8 *out_values, size_t sz)
412 int ret = of_property_read_variable_u8_array(np, propname, out_values,
421 * of_property_read_u16_array - Find and read an array of u16 from a property.
423 * @np: device node from which the property value is to be read.
424 * @propname: name of the property to be searched.
425 * @out_values: pointer to return value, modified only if return value is 0.
426 * @sz: number of array elements to read
428 * Search for a property in a device node and read 16-bit value(s) from
429 * it. Returns 0 on success, -EINVAL if the property does not exist,
430 * -ENODATA if property does not have a value, and -EOVERFLOW if the
431 * property data isn't large enough.
433 * dts entry of array should be like:
434 * property = /bits/ 16 <0x5000 0x6000 0x7000>;
436 * The out_values is modified only if a valid u16 value can be decoded.
438 static inline int of_property_read_u16_array(const struct device_node *np,
439 const char *propname,
440 u16 *out_values, size_t sz)
442 int ret = of_property_read_variable_u16_array(np, propname, out_values,
451 * of_property_read_u32_array - Find and read an array of 32 bit integers
454 * @np: device node from which the property value is to be read.
455 * @propname: name of the property to be searched.
456 * @out_values: pointer to return value, modified only if return value is 0.
457 * @sz: number of array elements to read
459 * Search for a property in a device node and read 32-bit value(s) from
460 * it. Returns 0 on success, -EINVAL if the property does not exist,
461 * -ENODATA if property does not have a value, and -EOVERFLOW if the
462 * property data isn't large enough.
464 * The out_values is modified only if a valid u32 value can be decoded.
466 static inline int of_property_read_u32_array(const struct device_node *np,
467 const char *propname,
468 u32 *out_values, size_t sz)
470 int ret = of_property_read_variable_u32_array(np, propname, out_values,
479 * of_property_read_u64_array - Find and read an array of 64 bit integers
482 * @np: device node from which the property value is to be read.
483 * @propname: name of the property to be searched.
484 * @out_values: pointer to return value, modified only if return value is 0.
485 * @sz: number of array elements to read
487 * Search for a property in a device node and read 64-bit value(s) from
488 * it. Returns 0 on success, -EINVAL if the property does not exist,
489 * -ENODATA if property does not have a value, and -EOVERFLOW if the
490 * property data isn't large enough.
492 * The out_values is modified only if a valid u64 value can be decoded.
494 static inline int of_property_read_u64_array(const struct device_node *np,
495 const char *propname,
496 u64 *out_values, size_t sz)
498 int ret = of_property_read_variable_u64_array(np, propname, out_values,
507 * struct property *prop;
511 * of_property_for_each_u32(np, "propname", prop, p, u)
512 * printk("U32 value: %x\n", u);
514 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
517 * struct property *prop;
520 * of_property_for_each_string(np, "propname", prop, s)
521 * printk("String value: %s\n", s);
523 const char *of_prop_next_string(struct property *prop, const char *cur);
525 bool of_console_check(struct device_node *dn, char *name, int index);
527 #else /* CONFIG_OF */
529 static inline void of_core_init(void)
533 static inline bool is_of_node(struct fwnode_handle *fwnode)
538 static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
543 static inline const char* of_node_full_name(const struct device_node *np)
548 static inline struct device_node *of_find_node_by_name(struct device_node *from,
554 static inline struct device_node *of_find_node_by_type(struct device_node *from,
560 static inline struct device_node *of_find_matching_node_and_match(
561 struct device_node *from,
562 const struct of_device_id *matches,
563 const struct of_device_id **match)
568 static inline struct device_node *of_find_node_by_path(const char *path)
573 static inline struct device_node *of_find_node_opts_by_path(const char *path,
579 static inline struct device_node *of_find_node_by_phandle(phandle handle)
584 static inline struct device_node *of_get_parent(const struct device_node *node)
589 static inline struct device_node *of_get_next_child(
590 const struct device_node *node, struct device_node *prev)
595 static inline struct device_node *of_get_next_available_child(
596 const struct device_node *node, struct device_node *prev)
601 static inline struct device_node *of_find_node_with_property(
602 struct device_node *from, const char *prop_name)
607 #define of_fwnode_handle(node) NULL
609 static inline bool of_have_populated_dt(void)
614 static inline struct device_node *of_get_child_by_name(
615 const struct device_node *node,
621 static inline int of_device_is_compatible(const struct device_node *device,
627 static inline bool of_device_is_available(const struct device_node *device)
632 static inline bool of_device_is_big_endian(const struct device_node *device)
637 static inline struct property *of_find_property(const struct device_node *np,
644 static inline struct device_node *of_find_compatible_node(
645 struct device_node *from,
652 static inline int of_property_count_elems_of_size(const struct device_node *np,
653 const char *propname, int elem_size)
658 static inline int of_property_read_u32_index(const struct device_node *np,
659 const char *propname, u32 index, u32 *out_value)
664 static inline int of_property_read_u8_array(const struct device_node *np,
665 const char *propname, u8 *out_values, size_t sz)
670 static inline int of_property_read_u16_array(const struct device_node *np,
671 const char *propname, u16 *out_values, size_t sz)
676 static inline int of_property_read_u32_array(const struct device_node *np,
677 const char *propname,
678 u32 *out_values, size_t sz)
683 static inline int of_property_read_u64_array(const struct device_node *np,
684 const char *propname,
685 u64 *out_values, size_t sz)
690 static inline int of_property_read_string(const struct device_node *np,
691 const char *propname,
692 const char **out_string)
697 static inline int of_property_read_string_helper(const struct device_node *np,
698 const char *propname,
699 const char **out_strs, size_t sz, int index)
704 static inline const void *of_get_property(const struct device_node *node,
711 static inline struct device_node *of_get_cpu_node(int cpu,
712 unsigned int *thread)
717 static inline int of_property_read_u64(const struct device_node *np,
718 const char *propname, u64 *out_value)
723 static inline int of_property_match_string(const struct device_node *np,
724 const char *propname,
730 static inline struct device_node *of_parse_phandle(const struct device_node *np,
731 const char *phandle_name,
737 static inline int of_parse_phandle_with_args(const struct device_node *np,
738 const char *list_name,
739 const char *cells_name,
741 struct of_phandle_args *out_args)
746 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
747 const char *list_name, int cells_count, int index,
748 struct of_phandle_args *out_args)
753 static inline int of_count_phandle_with_args(struct device_node *np,
754 const char *list_name,
755 const char *cells_name)
760 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
761 const struct device_node *np,
762 const char *list_name,
763 const char *cells_name,
769 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
774 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
781 static inline int of_alias_get_id(struct device_node *np, const char *stem)
786 static inline int of_alias_get_highest_id(const char *stem)
791 static inline int of_machine_is_compatible(const char *compat)
796 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
801 static inline const __be32 *of_prop_next_u32(struct property *prop,
802 const __be32 *cur, u32 *pu)
807 static inline const char *of_prop_next_string(struct property *prop,
813 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
818 static inline int of_node_test_and_set_flag(struct device_node *n,
824 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
828 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
832 static inline int of_property_check_flag(struct property *p, unsigned long flag)
837 static inline void of_property_set_flag(struct property *p, unsigned long flag)
841 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
845 #define of_match_ptr(_ptr) NULL
846 #define of_match_node(_matches, _node) NULL
847 #endif /* CONFIG_OF */
849 /* Default string compare functions, Allow arch asm/prom.h to override */
850 #if !defined(of_compat_cmp)
851 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
852 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
853 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
856 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
857 extern int of_node_to_nid(struct device_node *np);
859 static inline int of_node_to_nid(struct device_node *device)
865 #ifdef CONFIG_OF_NUMA
866 extern int of_numa_init(void);
868 static inline int of_numa_init(void)
874 static inline struct device_node *of_find_matching_node(
875 struct device_node *from,
876 const struct of_device_id *matches)
878 return of_find_matching_node_and_match(from, matches, NULL);
882 * of_property_count_u8_elems - Count the number of u8 elements in a property
884 * @np: device node from which the property value is to be read.
885 * @propname: name of the property to be searched.
887 * Search for a property in a device node and count the number of u8 elements
888 * in it. Returns number of elements on sucess, -EINVAL if the property does
889 * not exist or its length does not match a multiple of u8 and -ENODATA if the
890 * property does not have a value.
892 static inline int of_property_count_u8_elems(const struct device_node *np,
893 const char *propname)
895 return of_property_count_elems_of_size(np, propname, sizeof(u8));
899 * of_property_count_u16_elems - Count the number of u16 elements in a property
901 * @np: device node from which the property value is to be read.
902 * @propname: name of the property to be searched.
904 * Search for a property in a device node and count the number of u16 elements
905 * in it. Returns number of elements on sucess, -EINVAL if the property does
906 * not exist or its length does not match a multiple of u16 and -ENODATA if the
907 * property does not have a value.
909 static inline int of_property_count_u16_elems(const struct device_node *np,
910 const char *propname)
912 return of_property_count_elems_of_size(np, propname, sizeof(u16));
916 * of_property_count_u32_elems - Count the number of u32 elements in a property
918 * @np: device node from which the property value is to be read.
919 * @propname: name of the property to be searched.
921 * Search for a property in a device node and count the number of u32 elements
922 * in it. Returns number of elements on sucess, -EINVAL if the property does
923 * not exist or its length does not match a multiple of u32 and -ENODATA if the
924 * property does not have a value.
926 static inline int of_property_count_u32_elems(const struct device_node *np,
927 const char *propname)
929 return of_property_count_elems_of_size(np, propname, sizeof(u32));
933 * of_property_count_u64_elems - Count the number of u64 elements in a property
935 * @np: device node from which the property value is to be read.
936 * @propname: name of the property to be searched.
938 * Search for a property in a device node and count the number of u64 elements
939 * in it. Returns number of elements on sucess, -EINVAL if the property does
940 * not exist or its length does not match a multiple of u64 and -ENODATA if the
941 * property does not have a value.
943 static inline int of_property_count_u64_elems(const struct device_node *np,
944 const char *propname)
946 return of_property_count_elems_of_size(np, propname, sizeof(u64));
950 * of_property_read_string_array() - Read an array of strings from a multiple
952 * @np: device node from which the property value is to be read.
953 * @propname: name of the property to be searched.
954 * @out_strs: output array of string pointers.
955 * @sz: number of array elements to read.
957 * Search for a property in a device tree node and retrieve a list of
958 * terminated string values (pointer to data, not a copy) in that property.
960 * If @out_strs is NULL, the number of strings in the property is returned.
962 static inline int of_property_read_string_array(const struct device_node *np,
963 const char *propname, const char **out_strs,
966 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
970 * of_property_count_strings() - Find and return the number of strings from a
971 * multiple strings property.
972 * @np: device node from which the property value is to be read.
973 * @propname: name of the property to be searched.
975 * Search for a property in a device tree node and retrieve the number of null
976 * terminated string contain in it. Returns the number of strings on
977 * success, -EINVAL if the property does not exist, -ENODATA if property
978 * does not have a value, and -EILSEQ if the string is not null-terminated
979 * within the length of the property data.
981 static inline int of_property_count_strings(const struct device_node *np,
982 const char *propname)
984 return of_property_read_string_helper(np, propname, NULL, 0, 0);
988 * of_property_read_string_index() - Find and read a string from a multiple
990 * @np: device node from which the property value is to be read.
991 * @propname: name of the property to be searched.
992 * @index: index of the string in the list of strings
993 * @out_string: pointer to null terminated return string, modified only if
996 * Search for a property in a device tree node and retrieve a null
997 * terminated string value (pointer to data, not a copy) in the list of strings
998 * contained in that property.
999 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1000 * property does not have a value, and -EILSEQ if the string is not
1001 * null-terminated within the length of the property data.
1003 * The out_string pointer is modified only if a valid string can be decoded.
1005 static inline int of_property_read_string_index(const struct device_node *np,
1006 const char *propname,
1007 int index, const char **output)
1009 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1010 return rc < 0 ? rc : 0;
1014 * of_property_read_bool - Findfrom a property
1015 * @np: device node from which the property value is to be read.
1016 * @propname: name of the property to be searched.
1018 * Search for a property in a device node.
1019 * Returns true if the property exists false otherwise.
1021 static inline bool of_property_read_bool(const struct device_node *np,
1022 const char *propname)
1024 struct property *prop = of_find_property(np, propname, NULL);
1026 return prop ? true : false;
1029 static inline int of_property_read_u8(const struct device_node *np,
1030 const char *propname,
1033 return of_property_read_u8_array(np, propname, out_value, 1);
1036 static inline int of_property_read_u16(const struct device_node *np,
1037 const char *propname,
1040 return of_property_read_u16_array(np, propname, out_value, 1);
1043 static inline int of_property_read_u32(const struct device_node *np,
1044 const char *propname,
1047 return of_property_read_u32_array(np, propname, out_value, 1);
1050 static inline int of_property_read_s32(const struct device_node *np,
1051 const char *propname,
1054 return of_property_read_u32(np, propname, (u32*) out_value);
1057 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1058 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1059 err = of_phandle_iterator_next(it); \
1061 err = of_phandle_iterator_next(it))
1063 #define of_property_for_each_u32(np, propname, prop, p, u) \
1064 for (prop = of_find_property(np, propname, NULL), \
1065 p = of_prop_next_u32(prop, NULL, &u); \
1067 p = of_prop_next_u32(prop, p, &u))
1069 #define of_property_for_each_string(np, propname, prop, s) \
1070 for (prop = of_find_property(np, propname, NULL), \
1071 s = of_prop_next_string(prop, NULL); \
1073 s = of_prop_next_string(prop, s))
1075 #define for_each_node_by_name(dn, name) \
1076 for (dn = of_find_node_by_name(NULL, name); dn; \
1077 dn = of_find_node_by_name(dn, name))
1078 #define for_each_node_by_type(dn, type) \
1079 for (dn = of_find_node_by_type(NULL, type); dn; \
1080 dn = of_find_node_by_type(dn, type))
1081 #define for_each_compatible_node(dn, type, compatible) \
1082 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1083 dn = of_find_compatible_node(dn, type, compatible))
1084 #define for_each_matching_node(dn, matches) \
1085 for (dn = of_find_matching_node(NULL, matches); dn; \
1086 dn = of_find_matching_node(dn, matches))
1087 #define for_each_matching_node_and_match(dn, matches, match) \
1088 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1089 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1091 #define for_each_child_of_node(parent, child) \
1092 for (child = of_get_next_child(parent, NULL); child != NULL; \
1093 child = of_get_next_child(parent, child))
1094 #define for_each_available_child_of_node(parent, child) \
1095 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1096 child = of_get_next_available_child(parent, child))
1098 #define for_each_node_with_property(dn, prop_name) \
1099 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1100 dn = of_find_node_with_property(dn, prop_name))
1102 static inline int of_get_child_count(const struct device_node *np)
1104 struct device_node *child;
1107 for_each_child_of_node(np, child)
1113 static inline int of_get_available_child_count(const struct device_node *np)
1115 struct device_node *child;
1118 for_each_available_child_of_node(np, child)
1124 #if defined(CONFIG_OF) && !defined(MODULE)
1125 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1126 static const struct of_device_id __of_table_##name \
1127 __used __section(__##table##_of_table) \
1128 = { .compatible = compat, \
1129 .data = (fn == (fn_type)NULL) ? fn : fn }
1131 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1132 static const struct of_device_id __of_table_##name \
1133 __attribute__((unused)) \
1134 = { .compatible = compat, \
1135 .data = (fn == (fn_type)NULL) ? fn : fn }
1138 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1139 typedef int (*of_init_fn_1_ret)(struct device_node *);
1140 typedef void (*of_init_fn_1)(struct device_node *);
1142 #define OF_DECLARE_1(table, name, compat, fn) \
1143 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1144 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1145 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1146 #define OF_DECLARE_2(table, name, compat, fn) \
1147 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1150 * struct of_changeset_entry - Holds a changeset entry
1152 * @node: list_head for the log list
1153 * @action: notifier action
1154 * @np: pointer to the device node affected
1155 * @prop: pointer to the property affected
1156 * @old_prop: hold a pointer to the original property
1158 * Every modification of the device tree during a changeset
1159 * is held in a list of of_changeset_entry structures.
1160 * That way we can recover from a partial application, or we can
1161 * revert the changeset
1163 struct of_changeset_entry {
1164 struct list_head node;
1165 unsigned long action;
1166 struct device_node *np;
1167 struct property *prop;
1168 struct property *old_prop;
1172 * struct of_changeset - changeset tracker structure
1174 * @entries: list_head for the changeset entries
1176 * changesets are a convenient way to apply bulk changes to the
1177 * live tree. In case of an error, changes are rolled-back.
1178 * changesets live on after initial application, and if not
1179 * destroyed after use, they can be reverted in one single call.
1181 struct of_changeset {
1182 struct list_head entries;
1185 enum of_reconfig_change {
1186 OF_RECONFIG_NO_CHANGE = 0,
1187 OF_RECONFIG_CHANGE_ADD,
1188 OF_RECONFIG_CHANGE_REMOVE,
1191 #ifdef CONFIG_OF_DYNAMIC
1192 extern int of_reconfig_notifier_register(struct notifier_block *);
1193 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1194 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1195 extern int of_reconfig_get_state_change(unsigned long action,
1196 struct of_reconfig_data *arg);
1198 extern void of_changeset_init(struct of_changeset *ocs);
1199 extern void of_changeset_destroy(struct of_changeset *ocs);
1200 extern int of_changeset_apply(struct of_changeset *ocs);
1201 extern int of_changeset_revert(struct of_changeset *ocs);
1202 extern int of_changeset_action(struct of_changeset *ocs,
1203 unsigned long action, struct device_node *np,
1204 struct property *prop);
1206 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1207 struct device_node *np)
1209 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1212 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1213 struct device_node *np)
1215 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1218 static inline int of_changeset_add_property(struct of_changeset *ocs,
1219 struct device_node *np, struct property *prop)
1221 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1224 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1225 struct device_node *np, struct property *prop)
1227 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1230 static inline int of_changeset_update_property(struct of_changeset *ocs,
1231 struct device_node *np, struct property *prop)
1233 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1235 #else /* CONFIG_OF_DYNAMIC */
1236 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1240 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1244 static inline int of_reconfig_notify(unsigned long action,
1245 struct of_reconfig_data *arg)
1249 static inline int of_reconfig_get_state_change(unsigned long action,
1250 struct of_reconfig_data *arg)
1254 #endif /* CONFIG_OF_DYNAMIC */
1256 /* CONFIG_OF_RESOLVE api */
1257 extern int of_resolve_phandles(struct device_node *tree);
1260 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1261 * @np: Pointer to the given device_node
1263 * return true if present false otherwise
1265 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1267 return of_property_read_bool(np, "system-power-controller");
1274 enum of_overlay_notify_action {
1275 OF_OVERLAY_PRE_APPLY,
1276 OF_OVERLAY_POST_APPLY,
1277 OF_OVERLAY_PRE_REMOVE,
1278 OF_OVERLAY_POST_REMOVE,
1281 struct of_overlay_notify_data {
1282 struct device_node *overlay;
1283 struct device_node *target;
1286 #ifdef CONFIG_OF_OVERLAY
1288 /* ID based overlays; the API for external users */
1289 int of_overlay_create(struct device_node *tree);
1290 int of_overlay_destroy(int id);
1291 int of_overlay_destroy_all(void);
1293 int of_overlay_notifier_register(struct notifier_block *nb);
1294 int of_overlay_notifier_unregister(struct notifier_block *nb);
1298 static inline int of_overlay_create(struct device_node *tree)
1303 static inline int of_overlay_destroy(int id)
1308 static inline int of_overlay_destroy_all(void)
1313 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1318 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1325 #endif /* _LINUX_OF_H */