1 /* SPDX-License-Identifier: GPL-2.0+ */
5 * Definitions for talking to the Open Firmware PROM on
6 * Power Macintosh and other computers.
8 * Copyright (C) 1996-2005 Paul Mackerras.
10 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
11 * Updates for SPARC64 by David S. Miller
12 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
14 #include <linux/types.h>
15 #include <linux/bitops.h>
16 #include <linux/cleanup.h>
17 #include <linux/errno.h>
18 #include <linux/kobject.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/property.h>
21 #include <linux/list.h>
23 #include <asm/byteorder.h>
32 struct property *next;
33 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
36 #if defined(CONFIG_OF_PROMTREE)
37 unsigned int unique_id;
39 #if defined(CONFIG_OF_KOBJ)
40 struct bin_attribute attr;
44 #if defined(CONFIG_SPARC)
45 struct of_irq_controller;
51 const char *full_name;
52 struct fwnode_handle fwnode;
54 struct property *properties;
55 struct property *deadprops; /* removed properties */
56 struct device_node *parent;
57 struct device_node *child;
58 struct device_node *sibling;
59 #if defined(CONFIG_OF_KOBJ)
64 #if defined(CONFIG_SPARC)
65 unsigned int unique_id;
66 struct of_irq_controller *irq_trans;
70 #define MAX_PHANDLE_ARGS 16
71 struct of_phandle_args {
72 struct device_node *np;
74 uint32_t args[MAX_PHANDLE_ARGS];
77 struct of_phandle_iterator {
78 /* Common iterator information */
79 const char *cells_name;
81 const struct device_node *parent;
83 /* List size information */
84 const __be32 *list_end;
85 const __be32 *phandle_end;
87 /* Current position state */
91 struct device_node *node;
94 struct of_reconfig_data {
95 struct device_node *dn;
96 struct property *prop;
97 struct property *old_prop;
100 extern const struct kobj_type of_node_ktype;
101 extern const struct fwnode_operations of_fwnode_ops;
104 * of_node_init - initialize a devicetree node
105 * @node: Pointer to device node that has been created by kzalloc()
107 * On return the device_node refcount is set to one. Use of_node_put()
108 * on @node when done to free the memory allocated for it. If the node
109 * is NOT a dynamic node the memory will not be freed. The decision of
110 * whether to free the memory will be done by node->release(), which is
113 static inline void of_node_init(struct device_node *node)
115 #if defined(CONFIG_OF_KOBJ)
116 kobject_init(&node->kobj, &of_node_ktype);
118 fwnode_init(&node->fwnode, &of_fwnode_ops);
121 #if defined(CONFIG_OF_KOBJ)
122 #define of_node_kobj(n) (&(n)->kobj)
124 #define of_node_kobj(n) NULL
127 #ifdef CONFIG_OF_DYNAMIC
128 extern struct device_node *of_node_get(struct device_node *node);
129 extern void of_node_put(struct device_node *node);
130 #else /* CONFIG_OF_DYNAMIC */
131 /* Dummy ref counting routines - to be implemented later */
132 static inline struct device_node *of_node_get(struct device_node *node)
136 static inline void of_node_put(struct device_node *node) { }
137 #endif /* !CONFIG_OF_DYNAMIC */
138 DEFINE_FREE(device_node, struct device_node *, if (_T) of_node_put(_T))
140 /* Pointer for first entry in chain of all nodes. */
141 extern struct device_node *of_root;
142 extern struct device_node *of_chosen;
143 extern struct device_node *of_aliases;
144 extern struct device_node *of_stdout;
147 * struct device_node flag descriptions
148 * (need to be visible even when !CONFIG_OF)
150 #define OF_DYNAMIC 1 /* (and properties) allocated via kmalloc */
151 #define OF_DETACHED 2 /* detached from the device tree */
152 #define OF_POPULATED 3 /* device already created */
153 #define OF_POPULATED_BUS 4 /* platform bus created for children */
154 #define OF_OVERLAY 5 /* allocated for an overlay */
155 #define OF_OVERLAY_FREE_CSET 6 /* in overlay cset being freed */
157 #define OF_BAD_ADDR ((u64)-1)
160 void of_core_init(void);
162 static inline bool is_of_node(const struct fwnode_handle *fwnode)
164 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops;
167 #define to_of_node(__fwnode) \
169 typeof(__fwnode) __to_of_node_fwnode = (__fwnode); \
171 is_of_node(__to_of_node_fwnode) ? \
172 container_of(__to_of_node_fwnode, \
173 struct device_node, fwnode) : \
177 #define of_fwnode_handle(node) \
179 typeof(node) __of_fwnode_handle_node = (node); \
181 __of_fwnode_handle_node ? \
182 &__of_fwnode_handle_node->fwnode : NULL; \
185 static inline bool of_node_is_root(const struct device_node *node)
187 return node && (node->parent == NULL);
190 static inline int of_node_check_flag(const struct device_node *n, unsigned long flag)
192 return test_bit(flag, &n->_flags);
195 static inline int of_node_test_and_set_flag(struct device_node *n,
198 return test_and_set_bit(flag, &n->_flags);
201 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
203 set_bit(flag, &n->_flags);
206 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
208 clear_bit(flag, &n->_flags);
211 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
212 static inline int of_property_check_flag(const struct property *p, unsigned long flag)
214 return test_bit(flag, &p->_flags);
217 static inline void of_property_set_flag(struct property *p, unsigned long flag)
219 set_bit(flag, &p->_flags);
222 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
224 clear_bit(flag, &p->_flags);
228 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
229 extern struct device_node *of_find_all_nodes(struct device_node *prev);
232 * OF address retrieval & translation
235 /* Helper to read a big number; size is in cells (not bytes) */
236 static inline u64 of_read_number(const __be32 *cell, int size)
239 for (; size--; cell++)
240 r = (r << 32) | be32_to_cpu(*cell);
244 /* Like of_read_number, but we want an unsigned long result */
245 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
247 /* toss away upper bits if unsigned long is smaller than u64 */
248 return of_read_number(cell, size);
251 #if defined(CONFIG_SPARC)
252 #include <asm/prom.h>
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 extern bool of_node_name_eq(const struct device_node *np, const char *name);
259 extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);
261 static inline const char *of_node_full_name(const struct device_node *np)
263 return np ? np->full_name : "<no-node>";
266 #define for_each_of_allnodes_from(from, dn) \
267 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
268 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
269 extern struct device_node *of_find_node_by_name(struct device_node *from,
271 extern struct device_node *of_find_node_by_type(struct device_node *from,
273 extern struct device_node *of_find_compatible_node(struct device_node *from,
274 const char *type, const char *compat);
275 extern struct device_node *of_find_matching_node_and_match(
276 struct device_node *from,
277 const struct of_device_id *matches,
278 const struct of_device_id **match);
280 extern struct device_node *of_find_node_opts_by_path(const char *path,
282 static inline struct device_node *of_find_node_by_path(const char *path)
284 return of_find_node_opts_by_path(path, NULL);
287 extern struct device_node *of_find_node_by_phandle(phandle handle);
288 extern struct device_node *of_get_parent(const struct device_node *node);
289 extern struct device_node *of_get_next_parent(struct device_node *node);
290 extern struct device_node *of_get_next_child(const struct device_node *node,
291 struct device_node *prev);
292 extern struct device_node *of_get_next_child_with_prefix(const struct device_node *node,
293 struct device_node *prev,
295 extern struct device_node *of_get_next_available_child(
296 const struct device_node *node, struct device_node *prev);
297 extern struct device_node *of_get_next_reserved_child(
298 const struct device_node *node, struct device_node *prev);
300 extern struct device_node *of_get_compatible_child(const struct device_node *parent,
301 const char *compatible);
302 extern struct device_node *of_get_child_by_name(const struct device_node *node,
306 extern struct device_node *of_find_next_cache_node(const struct device_node *);
307 extern int of_find_last_cache_level(unsigned int cpu);
308 extern struct device_node *of_find_node_with_property(
309 struct device_node *from, const char *prop_name);
311 extern struct property *of_find_property(const struct device_node *np,
314 extern int of_property_count_elems_of_size(const struct device_node *np,
315 const char *propname, int elem_size);
316 extern int of_property_read_u32_index(const struct device_node *np,
317 const char *propname,
318 u32 index, u32 *out_value);
319 extern int of_property_read_u64_index(const struct device_node *np,
320 const char *propname,
321 u32 index, u64 *out_value);
322 extern int of_property_read_variable_u8_array(const struct device_node *np,
323 const char *propname, u8 *out_values,
324 size_t sz_min, size_t sz_max);
325 extern int of_property_read_variable_u16_array(const struct device_node *np,
326 const char *propname, u16 *out_values,
327 size_t sz_min, size_t sz_max);
328 extern int of_property_read_variable_u32_array(const struct device_node *np,
329 const char *propname,
333 extern int of_property_read_u64(const struct device_node *np,
334 const char *propname, u64 *out_value);
335 extern int of_property_read_variable_u64_array(const struct device_node *np,
336 const char *propname,
341 extern int of_property_read_string(const struct device_node *np,
342 const char *propname,
343 const char **out_string);
344 extern int of_property_match_string(const struct device_node *np,
345 const char *propname,
347 extern int of_property_read_string_helper(const struct device_node *np,
348 const char *propname,
349 const char **out_strs, size_t sz, int index);
350 extern int of_device_is_compatible(const struct device_node *device,
352 extern int of_device_compatible_match(const struct device_node *device,
353 const char *const *compat);
354 extern bool of_device_is_available(const struct device_node *device);
355 extern bool of_device_is_big_endian(const struct device_node *device);
356 extern const void *of_get_property(const struct device_node *node,
359 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
360 extern struct device_node *of_cpu_device_node_get(int cpu);
361 extern int of_cpu_node_to_id(struct device_node *np);
362 extern struct device_node *of_get_next_cpu_node(struct device_node *prev);
363 extern struct device_node *of_get_cpu_state_node(const struct device_node *cpu_node,
365 extern u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread);
367 extern int of_n_addr_cells(struct device_node *np);
368 extern int of_n_size_cells(struct device_node *np);
369 extern const struct of_device_id *of_match_node(
370 const struct of_device_id *matches, const struct device_node *node);
371 extern const void *of_device_get_match_data(const struct device *dev);
372 extern int of_alias_from_compatible(const struct device_node *node, char *alias,
374 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
375 extern int __of_parse_phandle_with_args(const struct device_node *np,
376 const char *list_name, const char *cells_name, int cell_count,
377 int index, struct of_phandle_args *out_args);
378 extern int of_parse_phandle_with_args_map(const struct device_node *np,
379 const char *list_name, const char *stem_name, int index,
380 struct of_phandle_args *out_args);
381 extern int of_count_phandle_with_args(const struct device_node *np,
382 const char *list_name, const char *cells_name);
384 /* module functions */
385 extern ssize_t of_modalias(const struct device_node *np, char *str, ssize_t len);
386 extern int of_request_module(const struct device_node *np);
388 /* phandle iterator functions */
389 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
390 const struct device_node *np,
391 const char *list_name,
392 const char *cells_name,
395 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
396 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
400 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
401 extern int of_alias_get_id(const struct device_node *np, const char *stem);
402 extern int of_alias_get_highest_id(const char *stem);
404 bool of_machine_compatible_match(const char *const *compats);
407 * of_machine_is_compatible - Test root of device tree for a given compatible value
408 * @compat: compatible string to look for in root node's compatible property.
410 * Return: true if the root node has the given value in its compatible property.
412 static inline bool of_machine_is_compatible(const char *compat)
414 const char *compats[] = { compat, NULL };
416 return of_machine_compatible_match(compats);
419 extern int of_add_property(struct device_node *np, struct property *prop);
420 extern int of_remove_property(struct device_node *np, struct property *prop);
421 extern int of_update_property(struct device_node *np, struct property *newprop);
423 /* For updating the device tree at runtime */
424 #define OF_RECONFIG_ATTACH_NODE 0x0001
425 #define OF_RECONFIG_DETACH_NODE 0x0002
426 #define OF_RECONFIG_ADD_PROPERTY 0x0003
427 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
428 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
430 extern int of_attach_node(struct device_node *);
431 extern int of_detach_node(struct device_node *);
433 #define of_match_ptr(_ptr) (_ptr)
438 * of_property_for_each_u32(np, "propname", u)
439 * printk("U32 value: %x\n", u);
441 const __be32 *of_prop_next_u32(const struct property *prop, const __be32 *cur,
444 * struct property *prop;
447 * of_property_for_each_string(np, "propname", prop, s)
448 * printk("String value: %s\n", s);
450 const char *of_prop_next_string(const struct property *prop, const char *cur);
452 bool of_console_check(const struct device_node *dn, char *name, int index);
454 int of_map_id(const struct device_node *np, u32 id,
455 const char *map_name, const char *map_mask_name,
456 struct device_node **target, u32 *id_out);
458 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
461 void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
462 unsigned long initrd_load_addr,
463 unsigned long initrd_len,
464 const char *cmdline, size_t extra_fdt_size);
465 #else /* CONFIG_OF */
467 static inline void of_core_init(void)
471 static inline bool is_of_node(const struct fwnode_handle *fwnode)
476 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
481 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
486 static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
491 static inline const char* of_node_full_name(const struct device_node *np)
496 static inline struct device_node *of_find_node_by_name(struct device_node *from,
502 static inline struct device_node *of_find_node_by_type(struct device_node *from,
508 static inline struct device_node *of_find_matching_node_and_match(
509 struct device_node *from,
510 const struct of_device_id *matches,
511 const struct of_device_id **match)
516 static inline struct device_node *of_find_node_by_path(const char *path)
521 static inline struct device_node *of_find_node_opts_by_path(const char *path,
527 static inline struct device_node *of_find_node_by_phandle(phandle handle)
532 static inline struct device_node *of_get_parent(const struct device_node *node)
537 static inline struct device_node *of_get_next_parent(struct device_node *node)
542 static inline struct device_node *of_get_next_child(
543 const struct device_node *node, struct device_node *prev)
548 static inline struct device_node *of_get_next_available_child(
549 const struct device_node *node, struct device_node *prev)
554 static inline struct device_node *of_get_next_reserved_child(
555 const struct device_node *node, struct device_node *prev)
560 static inline struct device_node *of_find_node_with_property(
561 struct device_node *from, const char *prop_name)
566 #define of_fwnode_handle(node) NULL
568 static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
569 const char *compatible)
574 static inline struct device_node *of_get_child_by_name(
575 const struct device_node *node,
581 static inline int of_device_is_compatible(const struct device_node *device,
587 static inline int of_device_compatible_match(const struct device_node *device,
588 const char *const *compat)
593 static inline bool of_device_is_available(const struct device_node *device)
598 static inline bool of_device_is_big_endian(const struct device_node *device)
603 static inline struct property *of_find_property(const struct device_node *np,
610 static inline struct device_node *of_find_compatible_node(
611 struct device_node *from,
618 static inline int of_property_count_elems_of_size(const struct device_node *np,
619 const char *propname, int elem_size)
624 static inline int of_property_read_u32_index(const struct device_node *np,
625 const char *propname, u32 index, u32 *out_value)
630 static inline int of_property_read_u64_index(const struct device_node *np,
631 const char *propname, u32 index, u64 *out_value)
636 static inline const void *of_get_property(const struct device_node *node,
643 static inline struct device_node *of_get_cpu_node(int cpu,
644 unsigned int *thread)
649 static inline struct device_node *of_cpu_device_node_get(int cpu)
654 static inline int of_cpu_node_to_id(struct device_node *np)
659 static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
664 static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
670 static inline int of_n_addr_cells(struct device_node *np)
675 static inline int of_n_size_cells(struct device_node *np)
680 static inline int of_property_read_variable_u8_array(const struct device_node *np,
681 const char *propname, u8 *out_values,
682 size_t sz_min, size_t sz_max)
687 static inline int of_property_read_variable_u16_array(const struct device_node *np,
688 const char *propname, u16 *out_values,
689 size_t sz_min, size_t sz_max)
694 static inline int of_property_read_variable_u32_array(const struct device_node *np,
695 const char *propname,
703 static inline int of_property_read_u64(const struct device_node *np,
704 const char *propname, u64 *out_value)
709 static inline int of_property_read_variable_u64_array(const struct device_node *np,
710 const char *propname,
718 static inline int of_property_read_string(const struct device_node *np,
719 const char *propname,
720 const char **out_string)
725 static inline int of_property_match_string(const struct device_node *np,
726 const char *propname,
732 static inline int of_property_read_string_helper(const struct device_node *np,
733 const char *propname,
734 const char **out_strs, size_t sz, int index)
739 static inline int __of_parse_phandle_with_args(const struct device_node *np,
740 const char *list_name,
741 const char *cells_name,
744 struct of_phandle_args *out_args)
749 static inline int of_parse_phandle_with_args_map(const struct device_node *np,
750 const char *list_name,
751 const char *stem_name,
753 struct of_phandle_args *out_args)
758 static inline int of_count_phandle_with_args(const struct device_node *np,
759 const char *list_name,
760 const char *cells_name)
765 static inline ssize_t of_modalias(const struct device_node *np, char *str,
771 static inline int of_request_module(const struct device_node *np)
776 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
777 const struct device_node *np,
778 const char *list_name,
779 const char *cells_name,
785 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
790 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
797 static inline int of_alias_get_id(struct device_node *np, const char *stem)
802 static inline int of_alias_get_highest_id(const char *stem)
807 static inline int of_machine_is_compatible(const char *compat)
812 static inline int of_add_property(struct device_node *np, struct property *prop)
817 static inline int of_remove_property(struct device_node *np, struct property *prop)
822 static inline bool of_machine_compatible_match(const char *const *compats)
827 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
832 static inline const __be32 *of_prop_next_u32(const struct property *prop,
833 const __be32 *cur, u32 *pu)
838 static inline const char *of_prop_next_string(const struct property *prop,
844 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
849 static inline int of_node_test_and_set_flag(struct device_node *n,
855 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
859 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
863 static inline int of_property_check_flag(const struct property *p,
869 static inline void of_property_set_flag(struct property *p, unsigned long flag)
873 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
877 static inline int of_map_id(const struct device_node *np, u32 id,
878 const char *map_name, const char *map_mask_name,
879 struct device_node **target, u32 *id_out)
884 static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
886 return PHYS_ADDR_MAX;
889 static inline const void *of_device_get_match_data(const struct device *dev)
894 #define of_match_ptr(_ptr) NULL
895 #define of_match_node(_matches, _node) NULL
896 #endif /* CONFIG_OF */
898 /* Default string compare functions, Allow arch asm/prom.h to override */
899 #if !defined(of_compat_cmp)
900 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
901 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
902 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
905 static inline int of_prop_val_eq(const struct property *p1, const struct property *p2)
907 return p1->length == p2->length &&
908 !memcmp(p1->value, p2->value, (size_t)p1->length);
911 #define for_each_property_of_node(dn, pp) \
912 for (pp = dn->properties; pp != NULL; pp = pp->next)
914 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
915 extern int of_node_to_nid(struct device_node *np);
917 static inline int of_node_to_nid(struct device_node *device)
923 #ifdef CONFIG_OF_NUMA
924 extern int of_numa_init(void);
926 static inline int of_numa_init(void)
932 static inline struct device_node *of_find_matching_node(
933 struct device_node *from,
934 const struct of_device_id *matches)
936 return of_find_matching_node_and_match(from, matches, NULL);
939 static inline const char *of_node_get_device_type(const struct device_node *np)
941 return of_get_property(np, "device_type", NULL);
944 static inline bool of_node_is_type(const struct device_node *np, const char *type)
946 const char *match = of_node_get_device_type(np);
948 return np && match && type && !strcmp(match, type);
952 * of_parse_phandle - Resolve a phandle property to a device_node pointer
953 * @np: Pointer to device node holding phandle property
954 * @phandle_name: Name of property holding a phandle value
955 * @index: For properties holding a table of phandles, this is the index into
958 * Return: The device_node pointer with refcount incremented. Use
959 * of_node_put() on it when done.
961 static inline struct device_node *of_parse_phandle(const struct device_node *np,
962 const char *phandle_name,
965 struct of_phandle_args args;
967 if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0,
975 * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
976 * @np: pointer to a device tree node containing a list
977 * @list_name: property name that contains a list
978 * @cells_name: property name that specifies phandles' arguments count
979 * @index: index of a phandle to parse out
980 * @out_args: optional pointer to output arguments structure (will be filled)
982 * This function is useful to parse lists of phandles and their arguments.
983 * Returns 0 on success and fills out_args, on error returns appropriate
986 * Caller is responsible to call of_node_put() on the returned out_args->np
1000 * list = <&phandle1 1 2 &phandle2 3>;
1003 * To get a device_node of the ``node2`` node you may call this:
1004 * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
1006 static inline int of_parse_phandle_with_args(const struct device_node *np,
1007 const char *list_name,
1008 const char *cells_name,
1010 struct of_phandle_args *out_args)
1012 int cell_count = -1;
1014 /* If cells_name is NULL we assume a cell count of 0 */
1018 return __of_parse_phandle_with_args(np, list_name, cells_name,
1019 cell_count, index, out_args);
1023 * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a list
1024 * @np: pointer to a device tree node containing a list
1025 * @list_name: property name that contains a list
1026 * @cell_count: number of argument cells following the phandle
1027 * @index: index of a phandle to parse out
1028 * @out_args: optional pointer to output arguments structure (will be filled)
1030 * This function is useful to parse lists of phandles and their arguments.
1031 * Returns 0 on success and fills out_args, on error returns appropriate
1034 * Caller is responsible to call of_node_put() on the returned out_args->np
1046 * list = <&phandle1 0 2 &phandle2 2 3>;
1049 * To get a device_node of the ``node2`` node you may call this:
1050 * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args);
1052 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
1053 const char *list_name,
1056 struct of_phandle_args *out_args)
1058 return __of_parse_phandle_with_args(np, list_name, NULL, cell_count,
1063 * of_parse_phandle_with_optional_args() - Find a node pointed by phandle in a list
1064 * @np: pointer to a device tree node containing a list
1065 * @list_name: property name that contains a list
1066 * @cells_name: property name that specifies phandles' arguments count
1067 * @index: index of a phandle to parse out
1068 * @out_args: optional pointer to output arguments structure (will be filled)
1070 * Same as of_parse_phandle_with_args() except that if the cells_name property
1071 * is not found, cell_count of 0 is assumed.
1073 * This is used to useful, if you have a phandle which didn't have arguments
1074 * before and thus doesn't have a '#*-cells' property but is now migrated to
1075 * having arguments while retaining backwards compatibility.
1077 static inline int of_parse_phandle_with_optional_args(const struct device_node *np,
1078 const char *list_name,
1079 const char *cells_name,
1081 struct of_phandle_args *out_args)
1083 return __of_parse_phandle_with_args(np, list_name, cells_name,
1084 0, index, out_args);
1088 * of_phandle_args_equal() - Compare two of_phandle_args
1089 * @a1: First of_phandle_args to compare
1090 * @a2: Second of_phandle_args to compare
1092 * Return: True if a1 and a2 are the same (same node pointer, same phandle
1093 * args), false otherwise.
1095 static inline bool of_phandle_args_equal(const struct of_phandle_args *a1,
1096 const struct of_phandle_args *a2)
1098 return a1->np == a2->np &&
1099 a1->args_count == a2->args_count &&
1100 !memcmp(a1->args, a2->args, sizeof(a1->args[0]) * a1->args_count);
1104 * of_property_count_u8_elems - Count the number of u8 elements in a property
1106 * @np: device node from which the property value is to be read.
1107 * @propname: name of the property to be searched.
1109 * Search for a property in a device node and count the number of u8 elements
1112 * Return: The number of elements on sucess, -EINVAL if the property does
1113 * not exist or its length does not match a multiple of u8 and -ENODATA if the
1114 * property does not have a value.
1116 static inline int of_property_count_u8_elems(const struct device_node *np,
1117 const char *propname)
1119 return of_property_count_elems_of_size(np, propname, sizeof(u8));
1123 * of_property_count_u16_elems - Count the number of u16 elements in a property
1125 * @np: device node from which the property value is to be read.
1126 * @propname: name of the property to be searched.
1128 * Search for a property in a device node and count the number of u16 elements
1131 * Return: The number of elements on sucess, -EINVAL if the property does
1132 * not exist or its length does not match a multiple of u16 and -ENODATA if the
1133 * property does not have a value.
1135 static inline int of_property_count_u16_elems(const struct device_node *np,
1136 const char *propname)
1138 return of_property_count_elems_of_size(np, propname, sizeof(u16));
1142 * of_property_count_u32_elems - Count the number of u32 elements in a property
1144 * @np: device node from which the property value is to be read.
1145 * @propname: name of the property to be searched.
1147 * Search for a property in a device node and count the number of u32 elements
1150 * Return: The number of elements on sucess, -EINVAL if the property does
1151 * not exist or its length does not match a multiple of u32 and -ENODATA if the
1152 * property does not have a value.
1154 static inline int of_property_count_u32_elems(const struct device_node *np,
1155 const char *propname)
1157 return of_property_count_elems_of_size(np, propname, sizeof(u32));
1161 * of_property_count_u64_elems - Count the number of u64 elements in a property
1163 * @np: device node from which the property value is to be read.
1164 * @propname: name of the property to be searched.
1166 * Search for a property in a device node and count the number of u64 elements
1169 * Return: The number of elements on sucess, -EINVAL if the property does
1170 * not exist or its length does not match a multiple of u64 and -ENODATA if the
1171 * property does not have a value.
1173 static inline int of_property_count_u64_elems(const struct device_node *np,
1174 const char *propname)
1176 return of_property_count_elems_of_size(np, propname, sizeof(u64));
1180 * of_property_read_string_array() - Read an array of strings from a multiple
1182 * @np: device node from which the property value is to be read.
1183 * @propname: name of the property to be searched.
1184 * @out_strs: output array of string pointers.
1185 * @sz: number of array elements to read.
1187 * Search for a property in a device tree node and retrieve a list of
1188 * terminated string values (pointer to data, not a copy) in that property.
1190 * Return: If @out_strs is NULL, the number of strings in the property is returned.
1192 static inline int of_property_read_string_array(const struct device_node *np,
1193 const char *propname, const char **out_strs,
1196 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
1200 * of_property_count_strings() - Find and return the number of strings from a
1201 * multiple strings property.
1202 * @np: device node from which the property value is to be read.
1203 * @propname: name of the property to be searched.
1205 * Search for a property in a device tree node and retrieve the number of null
1206 * terminated string contain in it.
1208 * Return: The number of strings on success, -EINVAL if the property does not
1209 * exist, -ENODATA if property does not have a value, and -EILSEQ if the string
1210 * is not null-terminated within the length of the property data.
1212 static inline int of_property_count_strings(const struct device_node *np,
1213 const char *propname)
1215 return of_property_read_string_helper(np, propname, NULL, 0, 0);
1219 * of_property_read_string_index() - Find and read a string from a multiple
1221 * @np: device node from which the property value is to be read.
1222 * @propname: name of the property to be searched.
1223 * @index: index of the string in the list of strings
1224 * @output: pointer to null terminated return string, modified only if
1225 * return value is 0.
1227 * Search for a property in a device tree node and retrieve a null
1228 * terminated string value (pointer to data, not a copy) in the list of strings
1229 * contained in that property.
1231 * Return: 0 on success, -EINVAL if the property does not exist, -ENODATA if
1232 * property does not have a value, and -EILSEQ if the string is not
1233 * null-terminated within the length of the property data.
1235 * The out_string pointer is modified only if a valid string can be decoded.
1237 static inline int of_property_read_string_index(const struct device_node *np,
1238 const char *propname,
1239 int index, const char **output)
1241 int rc = of_property_read_string_helper(np, propname, output, 1, index);
1242 return rc < 0 ? rc : 0;
1246 * of_property_read_bool - Find a property
1247 * @np: device node from which the property value is to be read.
1248 * @propname: name of the property to be searched.
1250 * Search for a boolean property in a device node. Usage on non-boolean
1251 * property types is deprecated.
1253 * Return: true if the property exists false otherwise.
1255 static inline bool of_property_read_bool(const struct device_node *np,
1256 const char *propname)
1258 const struct property *prop = of_find_property(np, propname, NULL);
1260 return prop ? true : false;
1264 * of_property_present - Test if a property is present in a node
1265 * @np: device node to search for the property.
1266 * @propname: name of the property to be searched.
1268 * Test for a property present in a device node.
1270 * Return: true if the property exists false otherwise.
1272 static inline bool of_property_present(const struct device_node *np, const char *propname)
1274 return of_property_read_bool(np, propname);
1278 * of_property_read_u8_array - Find and read an array of u8 from a property.
1280 * @np: device node from which the property value is to be read.
1281 * @propname: name of the property to be searched.
1282 * @out_values: pointer to return value, modified only if return value is 0.
1283 * @sz: number of array elements to read
1285 * Search for a property in a device node and read 8-bit value(s) from
1288 * dts entry of array should be like:
1289 * ``property = /bits/ 8 <0x50 0x60 0x70>;``
1291 * Return: 0 on success, -EINVAL if the property does not exist,
1292 * -ENODATA if property does not have a value, and -EOVERFLOW if the
1293 * property data isn't large enough.
1295 * The out_values is modified only if a valid u8 value can be decoded.
1297 static inline int of_property_read_u8_array(const struct device_node *np,
1298 const char *propname,
1299 u8 *out_values, size_t sz)
1301 int ret = of_property_read_variable_u8_array(np, propname, out_values,
1310 * of_property_read_u16_array - Find and read an array of u16 from a property.
1312 * @np: device node from which the property value is to be read.
1313 * @propname: name of the property to be searched.
1314 * @out_values: pointer to return value, modified only if return value is 0.
1315 * @sz: number of array elements to read
1317 * Search for a property in a device node and read 16-bit value(s) from
1320 * dts entry of array should be like:
1321 * ``property = /bits/ 16 <0x5000 0x6000 0x7000>;``
1323 * Return: 0 on success, -EINVAL if the property does not exist,
1324 * -ENODATA if property does not have a value, and -EOVERFLOW if the
1325 * property data isn't large enough.
1327 * The out_values is modified only if a valid u16 value can be decoded.
1329 static inline int of_property_read_u16_array(const struct device_node *np,
1330 const char *propname,
1331 u16 *out_values, size_t sz)
1333 int ret = of_property_read_variable_u16_array(np, propname, out_values,
1342 * of_property_read_u32_array - Find and read an array of 32 bit integers
1345 * @np: device node from which the property value is to be read.
1346 * @propname: name of the property to be searched.
1347 * @out_values: pointer to return value, modified only if return value is 0.
1348 * @sz: number of array elements to read
1350 * Search for a property in a device node and read 32-bit value(s) from
1353 * Return: 0 on success, -EINVAL if the property does not exist,
1354 * -ENODATA if property does not have a value, and -EOVERFLOW if the
1355 * property data isn't large enough.
1357 * The out_values is modified only if a valid u32 value can be decoded.
1359 static inline int of_property_read_u32_array(const struct device_node *np,
1360 const char *propname,
1361 u32 *out_values, size_t sz)
1363 int ret = of_property_read_variable_u32_array(np, propname, out_values,
1372 * of_property_read_u64_array - Find and read an array of 64 bit integers
1375 * @np: device node from which the property value is to be read.
1376 * @propname: name of the property to be searched.
1377 * @out_values: pointer to return value, modified only if return value is 0.
1378 * @sz: number of array elements to read
1380 * Search for a property in a device node and read 64-bit value(s) from
1383 * Return: 0 on success, -EINVAL if the property does not exist,
1384 * -ENODATA if property does not have a value, and -EOVERFLOW if the
1385 * property data isn't large enough.
1387 * The out_values is modified only if a valid u64 value can be decoded.
1389 static inline int of_property_read_u64_array(const struct device_node *np,
1390 const char *propname,
1391 u64 *out_values, size_t sz)
1393 int ret = of_property_read_variable_u64_array(np, propname, out_values,
1401 static inline int of_property_read_u8(const struct device_node *np,
1402 const char *propname,
1405 return of_property_read_u8_array(np, propname, out_value, 1);
1408 static inline int of_property_read_u16(const struct device_node *np,
1409 const char *propname,
1412 return of_property_read_u16_array(np, propname, out_value, 1);
1415 static inline int of_property_read_u32(const struct device_node *np,
1416 const char *propname,
1419 return of_property_read_u32_array(np, propname, out_value, 1);
1422 static inline int of_property_read_s32(const struct device_node *np,
1423 const char *propname,
1426 return of_property_read_u32(np, propname, (u32*) out_value);
1429 #define of_for_each_phandle(it, err, np, ln, cn, cc) \
1430 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \
1431 err = of_phandle_iterator_next(it); \
1433 err = of_phandle_iterator_next(it))
1435 #define of_property_for_each_u32(np, propname, u) \
1436 for (struct {const struct property *prop; const __be32 *item; } _it = \
1437 {of_find_property(np, propname, NULL), \
1438 of_prop_next_u32(_it.prop, NULL, &u)}; \
1440 _it.item = of_prop_next_u32(_it.prop, _it.item, &u))
1442 #define of_property_for_each_string(np, propname, prop, s) \
1443 for (prop = of_find_property(np, propname, NULL), \
1444 s = of_prop_next_string(prop, NULL); \
1446 s = of_prop_next_string(prop, s))
1448 #define for_each_node_by_name(dn, name) \
1449 for (dn = of_find_node_by_name(NULL, name); dn; \
1450 dn = of_find_node_by_name(dn, name))
1451 #define for_each_node_by_type(dn, type) \
1452 for (dn = of_find_node_by_type(NULL, type); dn; \
1453 dn = of_find_node_by_type(dn, type))
1454 #define for_each_compatible_node(dn, type, compatible) \
1455 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1456 dn = of_find_compatible_node(dn, type, compatible))
1457 #define for_each_matching_node(dn, matches) \
1458 for (dn = of_find_matching_node(NULL, matches); dn; \
1459 dn = of_find_matching_node(dn, matches))
1460 #define for_each_matching_node_and_match(dn, matches, match) \
1461 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1462 dn; dn = of_find_matching_node_and_match(dn, matches, match))
1464 #define for_each_child_of_node(parent, child) \
1465 for (child = of_get_next_child(parent, NULL); child != NULL; \
1466 child = of_get_next_child(parent, child))
1468 #define for_each_child_of_node_scoped(parent, child) \
1469 for (struct device_node *child __free(device_node) = \
1470 of_get_next_child(parent, NULL); \
1472 child = of_get_next_child(parent, child))
1474 #define for_each_child_of_node_with_prefix(parent, child, prefix) \
1475 for (struct device_node *child __free(device_node) = \
1476 of_get_next_child_with_prefix(parent, NULL, prefix); \
1478 child = of_get_next_child_with_prefix(parent, child, prefix))
1480 #define for_each_available_child_of_node(parent, child) \
1481 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1482 child = of_get_next_available_child(parent, child))
1483 #define for_each_reserved_child_of_node(parent, child) \
1484 for (child = of_get_next_reserved_child(parent, NULL); child != NULL; \
1485 child = of_get_next_reserved_child(parent, child))
1487 #define for_each_available_child_of_node_scoped(parent, child) \
1488 for (struct device_node *child __free(device_node) = \
1489 of_get_next_available_child(parent, NULL); \
1491 child = of_get_next_available_child(parent, child))
1493 #define for_each_of_cpu_node(cpu) \
1494 for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
1495 cpu = of_get_next_cpu_node(cpu))
1497 #define for_each_node_with_property(dn, prop_name) \
1498 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1499 dn = of_find_node_with_property(dn, prop_name))
1501 static inline int of_get_child_count(const struct device_node *np)
1503 struct device_node *child;
1506 for_each_child_of_node(np, child)
1512 static inline int of_get_available_child_count(const struct device_node *np)
1514 struct device_node *child;
1517 for_each_available_child_of_node(np, child)
1523 #define _OF_DECLARE_STUB(table, name, compat, fn, fn_type) \
1524 static const struct of_device_id __of_table_##name \
1525 __attribute__((unused)) \
1526 = { .compatible = compat, \
1527 .data = (fn == (fn_type)NULL) ? fn : fn }
1529 #if defined(CONFIG_OF) && !defined(MODULE)
1530 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1531 static const struct of_device_id __of_table_##name \
1532 __used __section("__" #table "_of_table") \
1533 __aligned(__alignof__(struct of_device_id)) \
1534 = { .compatible = compat, \
1535 .data = (fn == (fn_type)NULL) ? fn : fn }
1537 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
1538 _OF_DECLARE_STUB(table, name, compat, fn, fn_type)
1541 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1542 typedef int (*of_init_fn_1_ret)(struct device_node *);
1543 typedef void (*of_init_fn_1)(struct device_node *);
1545 #define OF_DECLARE_1(table, name, compat, fn) \
1546 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1547 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1548 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1549 #define OF_DECLARE_2(table, name, compat, fn) \
1550 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1553 * struct of_changeset_entry - Holds a changeset entry
1555 * @node: list_head for the log list
1556 * @action: notifier action
1557 * @np: pointer to the device node affected
1558 * @prop: pointer to the property affected
1559 * @old_prop: hold a pointer to the original property
1561 * Every modification of the device tree during a changeset
1562 * is held in a list of of_changeset_entry structures.
1563 * That way we can recover from a partial application, or we can
1564 * revert the changeset
1566 struct of_changeset_entry {
1567 struct list_head node;
1568 unsigned long action;
1569 struct device_node *np;
1570 struct property *prop;
1571 struct property *old_prop;
1575 * struct of_changeset - changeset tracker structure
1577 * @entries: list_head for the changeset entries
1579 * changesets are a convenient way to apply bulk changes to the
1580 * live tree. In case of an error, changes are rolled-back.
1581 * changesets live on after initial application, and if not
1582 * destroyed after use, they can be reverted in one single call.
1584 struct of_changeset {
1585 struct list_head entries;
1588 enum of_reconfig_change {
1589 OF_RECONFIG_NO_CHANGE = 0,
1590 OF_RECONFIG_CHANGE_ADD,
1591 OF_RECONFIG_CHANGE_REMOVE,
1594 struct notifier_block;
1596 #ifdef CONFIG_OF_DYNAMIC
1597 extern int of_reconfig_notifier_register(struct notifier_block *);
1598 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1599 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1600 extern int of_reconfig_get_state_change(unsigned long action,
1601 struct of_reconfig_data *arg);
1603 extern void of_changeset_init(struct of_changeset *ocs);
1604 extern void of_changeset_destroy(struct of_changeset *ocs);
1605 extern int of_changeset_apply(struct of_changeset *ocs);
1606 extern int of_changeset_revert(struct of_changeset *ocs);
1607 extern int of_changeset_action(struct of_changeset *ocs,
1608 unsigned long action, struct device_node *np,
1609 struct property *prop);
1611 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1612 struct device_node *np)
1614 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1617 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1618 struct device_node *np)
1620 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1623 static inline int of_changeset_add_property(struct of_changeset *ocs,
1624 struct device_node *np, struct property *prop)
1626 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1629 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1630 struct device_node *np, struct property *prop)
1632 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1635 static inline int of_changeset_update_property(struct of_changeset *ocs,
1636 struct device_node *np, struct property *prop)
1638 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1641 struct device_node *of_changeset_create_node(struct of_changeset *ocs,
1642 struct device_node *parent,
1643 const char *full_name);
1644 int of_changeset_add_prop_string(struct of_changeset *ocs,
1645 struct device_node *np,
1646 const char *prop_name, const char *str);
1647 int of_changeset_add_prop_string_array(struct of_changeset *ocs,
1648 struct device_node *np,
1649 const char *prop_name,
1650 const char * const *str_array, size_t sz);
1651 int of_changeset_add_prop_u32_array(struct of_changeset *ocs,
1652 struct device_node *np,
1653 const char *prop_name,
1654 const u32 *array, size_t sz);
1655 static inline int of_changeset_add_prop_u32(struct of_changeset *ocs,
1656 struct device_node *np,
1657 const char *prop_name,
1660 return of_changeset_add_prop_u32_array(ocs, np, prop_name, &val, 1);
1663 int of_changeset_update_prop_string(struct of_changeset *ocs,
1664 struct device_node *np,
1665 const char *prop_name, const char *str);
1667 int of_changeset_add_prop_bool(struct of_changeset *ocs, struct device_node *np,
1668 const char *prop_name);
1670 #else /* CONFIG_OF_DYNAMIC */
1671 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1675 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1679 static inline int of_reconfig_notify(unsigned long action,
1680 struct of_reconfig_data *arg)
1684 static inline int of_reconfig_get_state_change(unsigned long action,
1685 struct of_reconfig_data *arg)
1689 #endif /* CONFIG_OF_DYNAMIC */
1692 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1693 * @np: Pointer to the given device_node
1695 * Return: true if present false otherwise
1697 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1699 return of_property_read_bool(np, "system-power-controller");
1703 * of_have_populated_dt() - Has DT been populated by bootloader
1705 * Return: True if a DTB has been populated by the bootloader and it isn't the
1706 * empty builtin one. False otherwise.
1708 static inline bool of_have_populated_dt(void)
1711 return of_property_present(of_root, "compatible");
1721 enum of_overlay_notify_action {
1722 OF_OVERLAY_INIT = 0, /* kzalloc() of ovcs sets this value */
1723 OF_OVERLAY_PRE_APPLY,
1724 OF_OVERLAY_POST_APPLY,
1725 OF_OVERLAY_PRE_REMOVE,
1726 OF_OVERLAY_POST_REMOVE,
1729 static inline const char *of_overlay_action_name(enum of_overlay_notify_action action)
1731 static const char *const of_overlay_action_name[] = {
1739 return of_overlay_action_name[action];
1742 struct of_overlay_notify_data {
1743 struct device_node *overlay;
1744 struct device_node *target;
1747 #ifdef CONFIG_OF_OVERLAY
1749 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
1750 int *ovcs_id, const struct device_node *target_base);
1751 int of_overlay_remove(int *ovcs_id);
1752 int of_overlay_remove_all(void);
1754 int of_overlay_notifier_register(struct notifier_block *nb);
1755 int of_overlay_notifier_unregister(struct notifier_block *nb);
1759 static inline int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
1760 int *ovcs_id, const struct device_node *target_base)
1765 static inline int of_overlay_remove(int *ovcs_id)
1770 static inline int of_overlay_remove_all(void)
1775 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1780 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1787 #endif /* _LINUX_OF_H */