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>
28 #include <asm/byteorder.h>
29 #include <asm/errno.h>
38 struct property *next;
40 unsigned int unique_id;
41 struct bin_attribute attr;
44 #if defined(CONFIG_SPARC)
45 struct of_irq_controller;
52 const char *full_name;
53 struct fwnode_handle fwnode;
55 struct property *properties;
56 struct property *deadprops; /* removed properties */
57 struct device_node *parent;
58 struct device_node *child;
59 struct device_node *sibling;
60 struct device_node *next; /* next device of same type */
61 struct device_node *allnext; /* next in list of all nodes */
65 #if defined(CONFIG_SPARC)
66 const char *path_component_name;
67 unsigned int unique_id;
68 struct of_irq_controller *irq_trans;
72 #define MAX_PHANDLE_ARGS 16
73 struct of_phandle_args {
74 struct device_node *np;
76 uint32_t args[MAX_PHANDLE_ARGS];
79 /* initialize a node */
80 extern struct kobj_type of_node_ktype;
81 static inline void of_node_init(struct device_node *node)
83 kobject_init(&node->kobj, &of_node_ktype);
84 node->fwnode.type = FWNODE_OF;
87 /* true when node is initialized */
88 static inline int of_node_is_initialized(struct device_node *node)
90 return node && node->kobj.state_initialized;
93 /* true when node is attached (i.e. present on sysfs) */
94 static inline int of_node_is_attached(struct device_node *node)
96 return node && node->kobj.state_in_sysfs;
99 #ifdef CONFIG_OF_DYNAMIC
100 extern struct device_node *of_node_get(struct device_node *node);
101 extern void of_node_put(struct device_node *node);
102 #else /* CONFIG_OF_DYNAMIC */
103 /* Dummy ref counting routines - to be implemented later */
104 static inline struct device_node *of_node_get(struct device_node *node)
108 static inline void of_node_put(struct device_node *node) { }
109 #endif /* !CONFIG_OF_DYNAMIC */
113 /* Pointer for first entry in chain of all nodes. */
114 extern struct device_node *of_allnodes;
115 extern struct device_node *of_chosen;
116 extern struct device_node *of_aliases;
117 extern struct device_node *of_stdout;
118 extern raw_spinlock_t devtree_lock;
120 static inline bool is_of_node(struct fwnode_handle *fwnode)
122 return fwnode && fwnode->type == FWNODE_OF;
125 static inline struct device_node *of_node(struct fwnode_handle *fwnode)
127 return fwnode ? container_of(fwnode, struct device_node, fwnode) : NULL;
130 static inline bool of_have_populated_dt(void)
132 return of_allnodes != NULL;
135 static inline bool of_node_is_root(const struct device_node *node)
137 return node && (node->parent == NULL);
140 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
142 return test_bit(flag, &n->_flags);
145 static inline int of_node_test_and_set_flag(struct device_node *n,
148 return test_and_set_bit(flag, &n->_flags);
151 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
153 set_bit(flag, &n->_flags);
156 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
158 clear_bit(flag, &n->_flags);
161 static inline int of_property_check_flag(struct property *p, unsigned long flag)
163 return test_bit(flag, &p->_flags);
166 static inline void of_property_set_flag(struct property *p, unsigned long flag)
168 set_bit(flag, &p->_flags);
171 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
173 clear_bit(flag, &p->_flags);
176 extern struct device_node *of_find_all_nodes(struct device_node *prev);
179 * OF address retrieval & translation
182 /* Helper to read a big number; size is in cells (not bytes) */
183 static inline u64 of_read_number(const __be32 *cell, int size)
187 r = (r << 32) | be32_to_cpu(*(cell++));
191 /* Like of_read_number, but we want an unsigned long result */
192 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
194 /* toss away upper bits if unsigned long is smaller than u64 */
195 return of_read_number(cell, size);
198 #if defined(CONFIG_SPARC)
199 #include <asm/prom.h>
202 /* Default #address and #size cells. Allow arch asm/prom.h to override */
203 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
204 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
205 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
208 /* Default string compare functions, Allow arch asm/prom.h to override */
209 #if !defined(of_compat_cmp)
210 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
211 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
212 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
215 /* flag descriptions */
216 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
217 #define OF_DETACHED 2 /* node has been detached from the device tree */
218 #define OF_POPULATED 3 /* device already created for the node */
219 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
221 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
222 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
224 #define OF_BAD_ADDR ((u64)-1)
226 static inline const char *of_node_full_name(const struct device_node *np)
228 return np ? np->full_name : "<no-node>";
231 #define for_each_of_allnodes(dn) \
232 for (dn = of_allnodes; dn; dn = dn->allnext)
233 extern struct device_node *of_find_node_by_name(struct device_node *from,
235 extern struct device_node *of_find_node_by_type(struct device_node *from,
237 extern struct device_node *of_find_compatible_node(struct device_node *from,
238 const char *type, const char *compat);
239 extern struct device_node *of_find_matching_node_and_match(
240 struct device_node *from,
241 const struct of_device_id *matches,
242 const struct of_device_id **match);
244 extern struct device_node *of_find_node_by_path(const char *path);
245 extern struct device_node *of_find_node_by_phandle(phandle handle);
246 extern struct device_node *of_get_parent(const struct device_node *node);
247 extern struct device_node *of_get_next_parent(struct device_node *node);
248 extern struct device_node *of_get_next_child(const struct device_node *node,
249 struct device_node *prev);
250 extern struct device_node *of_get_next_available_child(
251 const struct device_node *node, struct device_node *prev);
253 extern struct device_node *of_get_child_by_name(const struct device_node *node,
257 extern struct device_node *of_find_next_cache_node(const struct device_node *);
258 extern struct device_node *of_find_node_with_property(
259 struct device_node *from, const char *prop_name);
261 extern struct property *of_find_property(const struct device_node *np,
264 extern int of_property_count_elems_of_size(const struct device_node *np,
265 const char *propname, int elem_size);
266 extern int of_property_read_u32_index(const struct device_node *np,
267 const char *propname,
268 u32 index, u32 *out_value);
269 extern int of_property_read_u8_array(const struct device_node *np,
270 const char *propname, u8 *out_values, size_t sz);
271 extern int of_property_read_u16_array(const struct device_node *np,
272 const char *propname, u16 *out_values, size_t sz);
273 extern int of_property_read_u32_array(const struct device_node *np,
274 const char *propname,
277 extern int of_property_read_u64(const struct device_node *np,
278 const char *propname, u64 *out_value);
279 extern int of_property_read_u64_array(const struct device_node *np,
280 const char *propname,
284 extern int of_property_read_string(struct device_node *np,
285 const char *propname,
286 const char **out_string);
287 extern int of_property_match_string(struct device_node *np,
288 const char *propname,
290 extern int of_property_read_string_helper(struct device_node *np,
291 const char *propname,
292 const char **out_strs, size_t sz, int index);
293 extern int of_device_is_compatible(const struct device_node *device,
295 extern int of_device_is_available(const struct device_node *device);
296 extern const void *of_get_property(const struct device_node *node,
299 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
300 #define for_each_property_of_node(dn, pp) \
301 for (pp = dn->properties; pp != NULL; pp = pp->next)
303 extern int of_n_addr_cells(struct device_node *np);
304 extern int of_n_size_cells(struct device_node *np);
305 extern const struct of_device_id *of_match_node(
306 const struct of_device_id *matches, const struct device_node *node);
307 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
308 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
309 extern struct device_node *of_parse_phandle(const struct device_node *np,
310 const char *phandle_name,
312 extern int of_parse_phandle_with_args(const struct device_node *np,
313 const char *list_name, const char *cells_name, int index,
314 struct of_phandle_args *out_args);
315 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
316 const char *list_name, int cells_count, int index,
317 struct of_phandle_args *out_args);
318 extern int of_count_phandle_with_args(const struct device_node *np,
319 const char *list_name, const char *cells_name);
321 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
322 extern int of_alias_get_id(struct device_node *np, const char *stem);
324 extern int of_machine_is_compatible(const char *compat);
326 extern int of_add_property(struct device_node *np, struct property *prop);
327 extern int of_remove_property(struct device_node *np, struct property *prop);
328 extern int of_update_property(struct device_node *np, struct property *newprop);
330 /* For updating the device tree at runtime */
331 #define OF_RECONFIG_ATTACH_NODE 0x0001
332 #define OF_RECONFIG_DETACH_NODE 0x0002
333 #define OF_RECONFIG_ADD_PROPERTY 0x0003
334 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
335 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
337 struct of_prop_reconfig {
338 struct device_node *dn;
339 struct property *prop;
340 struct property *old_prop;
343 extern int of_reconfig_notifier_register(struct notifier_block *);
344 extern int of_reconfig_notifier_unregister(struct notifier_block *);
345 extern int of_reconfig_notify(unsigned long, void *);
347 extern int of_attach_node(struct device_node *);
348 extern int of_detach_node(struct device_node *);
350 #define of_match_ptr(_ptr) (_ptr)
353 * struct property *prop;
357 * of_property_for_each_u32(np, "propname", prop, p, u)
358 * printk("U32 value: %x\n", u);
360 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
363 * struct property *prop;
366 * of_property_for_each_string(np, "propname", prop, s)
367 * printk("String value: %s\n", s);
369 const char *of_prop_next_string(struct property *prop, const char *cur);
371 bool of_console_check(struct device_node *dn, char *name, int index);
373 #else /* CONFIG_OF */
375 static inline bool is_of_node(struct fwnode_handle *fwnode)
380 static inline struct device_node *of_node(struct fwnode_handle *fwnode)
385 static inline const char* of_node_full_name(const struct device_node *np)
390 static inline struct device_node *of_find_node_by_name(struct device_node *from,
396 static inline struct device_node *of_find_node_by_type(struct device_node *from,
402 static inline struct device_node *of_find_matching_node_and_match(
403 struct device_node *from,
404 const struct of_device_id *matches,
405 const struct of_device_id **match)
410 static inline struct device_node *of_find_node_by_path(const char *path)
415 static inline struct device_node *of_get_parent(const struct device_node *node)
420 static inline struct device_node *of_get_next_child(
421 const struct device_node *node, struct device_node *prev)
426 static inline struct device_node *of_get_next_available_child(
427 const struct device_node *node, struct device_node *prev)
432 static inline struct device_node *of_find_node_with_property(
433 struct device_node *from, const char *prop_name)
438 static inline bool of_have_populated_dt(void)
443 static inline struct device_node *of_get_child_by_name(
444 const struct device_node *node,
450 static inline int of_device_is_compatible(const struct device_node *device,
456 static inline int of_device_is_available(const struct device_node *device)
461 static inline struct property *of_find_property(const struct device_node *np,
468 static inline struct device_node *of_find_compatible_node(
469 struct device_node *from,
476 static inline int of_property_count_elems_of_size(const struct device_node *np,
477 const char *propname, int elem_size)
482 static inline int of_property_read_u32_index(const struct device_node *np,
483 const char *propname, u32 index, u32 *out_value)
488 static inline int of_property_read_u8_array(const struct device_node *np,
489 const char *propname, u8 *out_values, size_t sz)
494 static inline int of_property_read_u16_array(const struct device_node *np,
495 const char *propname, u16 *out_values, size_t sz)
500 static inline int of_property_read_u32_array(const struct device_node *np,
501 const char *propname,
502 u32 *out_values, size_t sz)
507 static inline int of_property_read_u64_array(const struct device_node *np,
508 const char *propname,
509 u64 *out_values, size_t sz)
514 static inline int of_property_read_string(struct device_node *np,
515 const char *propname,
516 const char **out_string)
521 static inline int of_property_read_string_helper(struct device_node *np,
522 const char *propname,
523 const char **out_strs, size_t sz, int index)
528 static inline const void *of_get_property(const struct device_node *node,
535 static inline struct device_node *of_get_cpu_node(int cpu,
536 unsigned int *thread)
541 static inline int of_property_read_u64(const struct device_node *np,
542 const char *propname, u64 *out_value)
547 static inline int of_property_match_string(struct device_node *np,
548 const char *propname,
554 static inline struct device_node *of_parse_phandle(const struct device_node *np,
555 const char *phandle_name,
561 static inline int of_parse_phandle_with_args(struct device_node *np,
562 const char *list_name,
563 const char *cells_name,
565 struct of_phandle_args *out_args)
570 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
571 const char *list_name, int cells_count, int index,
572 struct of_phandle_args *out_args)
577 static inline int of_count_phandle_with_args(struct device_node *np,
578 const char *list_name,
579 const char *cells_name)
584 static inline int of_alias_get_id(struct device_node *np, const char *stem)
589 static inline int of_machine_is_compatible(const char *compat)
594 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
599 static inline const __be32 *of_prop_next_u32(struct property *prop,
600 const __be32 *cur, u32 *pu)
605 static inline const char *of_prop_next_string(struct property *prop,
611 #define of_match_ptr(_ptr) NULL
612 #define of_match_node(_matches, _node) NULL
613 #endif /* CONFIG_OF */
615 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
616 extern int of_node_to_nid(struct device_node *np);
618 static inline int of_node_to_nid(struct device_node *device) { return 0; }
621 static inline struct device_node *of_find_matching_node(
622 struct device_node *from,
623 const struct of_device_id *matches)
625 return of_find_matching_node_and_match(from, matches, NULL);
629 * of_property_count_u8_elems - Count the number of u8 elements in a property
631 * @np: device node from which the property value is to be read.
632 * @propname: name of the property to be searched.
634 * Search for a property in a device node and count the number of u8 elements
635 * in it. Returns number of elements on sucess, -EINVAL if the property does
636 * not exist or its length does not match a multiple of u8 and -ENODATA if the
637 * property does not have a value.
639 static inline int of_property_count_u8_elems(const struct device_node *np,
640 const char *propname)
642 return of_property_count_elems_of_size(np, propname, sizeof(u8));
646 * of_property_count_u16_elems - Count the number of u16 elements in a property
648 * @np: device node from which the property value is to be read.
649 * @propname: name of the property to be searched.
651 * Search for a property in a device node and count the number of u16 elements
652 * in it. Returns number of elements on sucess, -EINVAL if the property does
653 * not exist or its length does not match a multiple of u16 and -ENODATA if the
654 * property does not have a value.
656 static inline int of_property_count_u16_elems(const struct device_node *np,
657 const char *propname)
659 return of_property_count_elems_of_size(np, propname, sizeof(u16));
663 * of_property_count_u32_elems - Count the number of u32 elements in a property
665 * @np: device node from which the property value is to be read.
666 * @propname: name of the property to be searched.
668 * Search for a property in a device node and count the number of u32 elements
669 * in it. Returns number of elements on sucess, -EINVAL if the property does
670 * not exist or its length does not match a multiple of u32 and -ENODATA if the
671 * property does not have a value.
673 static inline int of_property_count_u32_elems(const struct device_node *np,
674 const char *propname)
676 return of_property_count_elems_of_size(np, propname, sizeof(u32));
680 * of_property_count_u64_elems - Count the number of u64 elements in a property
682 * @np: device node from which the property value is to be read.
683 * @propname: name of the property to be searched.
685 * Search for a property in a device node and count the number of u64 elements
686 * in it. Returns number of elements on sucess, -EINVAL if the property does
687 * not exist or its length does not match a multiple of u64 and -ENODATA if the
688 * property does not have a value.
690 static inline int of_property_count_u64_elems(const struct device_node *np,
691 const char *propname)
693 return of_property_count_elems_of_size(np, propname, sizeof(u64));
697 * of_property_read_string_array() - Read an array of strings from a multiple
699 * @np: device node from which the property value is to be read.
700 * @propname: name of the property to be searched.
701 * @out_strs: output array of string pointers.
702 * @sz: number of array elements to read.
704 * Search for a property in a device tree node and retrieve a list of
705 * terminated string values (pointer to data, not a copy) in that property.
707 * If @out_strs is NULL, the number of strings in the property is returned.
709 static inline int of_property_read_string_array(struct device_node *np,
710 const char *propname, const char **out_strs,
713 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
717 * of_property_count_strings() - Find and return the number of strings from a
718 * multiple strings property.
719 * @np: device node from which the property value is to be read.
720 * @propname: name of the property to be searched.
722 * Search for a property in a device tree node and retrieve the number of null
723 * terminated string contain in it. Returns the number of strings on
724 * success, -EINVAL if the property does not exist, -ENODATA if property
725 * does not have a value, and -EILSEQ if the string is not null-terminated
726 * within the length of the property data.
728 static inline int of_property_count_strings(struct device_node *np,
729 const char *propname)
731 return of_property_read_string_helper(np, propname, NULL, 0, 0);
735 * of_property_read_string_index() - Find and read a string from a multiple
737 * @np: device node from which the property value is to be read.
738 * @propname: name of the property to be searched.
739 * @index: index of the string in the list of strings
740 * @out_string: pointer to null terminated return string, modified only if
743 * Search for a property in a device tree node and retrieve a null
744 * terminated string value (pointer to data, not a copy) in the list of strings
745 * contained in that property.
746 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
747 * property does not have a value, and -EILSEQ if the string is not
748 * null-terminated within the length of the property data.
750 * The out_string pointer is modified only if a valid string can be decoded.
752 static inline int of_property_read_string_index(struct device_node *np,
753 const char *propname,
754 int index, const char **output)
756 int rc = of_property_read_string_helper(np, propname, output, 1, index);
757 return rc < 0 ? rc : 0;
761 * of_property_read_bool - Findfrom a property
762 * @np: device node from which the property value is to be read.
763 * @propname: name of the property to be searched.
765 * Search for a property in a device node.
766 * Returns true if the property exist false otherwise.
768 static inline bool of_property_read_bool(const struct device_node *np,
769 const char *propname)
771 struct property *prop = of_find_property(np, propname, NULL);
773 return prop ? true : false;
776 static inline int of_property_read_u8(const struct device_node *np,
777 const char *propname,
780 return of_property_read_u8_array(np, propname, out_value, 1);
783 static inline int of_property_read_u16(const struct device_node *np,
784 const char *propname,
787 return of_property_read_u16_array(np, propname, out_value, 1);
790 static inline int of_property_read_u32(const struct device_node *np,
791 const char *propname,
794 return of_property_read_u32_array(np, propname, out_value, 1);
797 #define of_property_for_each_u32(np, propname, prop, p, u) \
798 for (prop = of_find_property(np, propname, NULL), \
799 p = of_prop_next_u32(prop, NULL, &u); \
801 p = of_prop_next_u32(prop, p, &u))
803 #define of_property_for_each_string(np, propname, prop, s) \
804 for (prop = of_find_property(np, propname, NULL), \
805 s = of_prop_next_string(prop, NULL); \
807 s = of_prop_next_string(prop, s))
809 #define for_each_node_by_name(dn, name) \
810 for (dn = of_find_node_by_name(NULL, name); dn; \
811 dn = of_find_node_by_name(dn, name))
812 #define for_each_node_by_type(dn, type) \
813 for (dn = of_find_node_by_type(NULL, type); dn; \
814 dn = of_find_node_by_type(dn, type))
815 #define for_each_compatible_node(dn, type, compatible) \
816 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
817 dn = of_find_compatible_node(dn, type, compatible))
818 #define for_each_matching_node(dn, matches) \
819 for (dn = of_find_matching_node(NULL, matches); dn; \
820 dn = of_find_matching_node(dn, matches))
821 #define for_each_matching_node_and_match(dn, matches, match) \
822 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
823 dn; dn = of_find_matching_node_and_match(dn, matches, match))
825 #define for_each_child_of_node(parent, child) \
826 for (child = of_get_next_child(parent, NULL); child != NULL; \
827 child = of_get_next_child(parent, child))
828 #define for_each_available_child_of_node(parent, child) \
829 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
830 child = of_get_next_available_child(parent, child))
832 #define for_each_node_with_property(dn, prop_name) \
833 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
834 dn = of_find_node_with_property(dn, prop_name))
836 static inline int of_get_child_count(const struct device_node *np)
838 struct device_node *child;
841 for_each_child_of_node(np, child)
847 static inline int of_get_available_child_count(const struct device_node *np)
849 struct device_node *child;
852 for_each_available_child_of_node(np, child)
859 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
860 static const struct of_device_id __of_table_##name \
861 __used __section(__##table##_of_table) \
862 = { .compatible = compat, \
863 .data = (fn == (fn_type)NULL) ? fn : fn }
865 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
866 static const struct of_device_id __of_table_##name \
867 __attribute__((unused)) \
868 = { .compatible = compat, \
869 .data = (fn == (fn_type)NULL) ? fn : fn }
872 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
873 typedef void (*of_init_fn_1)(struct device_node *);
875 #define OF_DECLARE_1(table, name, compat, fn) \
876 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
877 #define OF_DECLARE_2(table, name, compat, fn) \
878 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
881 * struct of_changeset_entry - Holds a changeset entry
883 * @node: list_head for the log list
884 * @action: notifier action
885 * @np: pointer to the device node affected
886 * @prop: pointer to the property affected
887 * @old_prop: hold a pointer to the original property
889 * Every modification of the device tree during a changeset
890 * is held in a list of of_changeset_entry structures.
891 * That way we can recover from a partial application, or we can
892 * revert the changeset
894 struct of_changeset_entry {
895 struct list_head node;
896 unsigned long action;
897 struct device_node *np;
898 struct property *prop;
899 struct property *old_prop;
903 * struct of_changeset - changeset tracker structure
905 * @entries: list_head for the changeset entries
907 * changesets are a convenient way to apply bulk changes to the
908 * live tree. In case of an error, changes are rolled-back.
909 * changesets live on after initial application, and if not
910 * destroyed after use, they can be reverted in one single call.
912 struct of_changeset {
913 struct list_head entries;
916 #ifdef CONFIG_OF_DYNAMIC
917 extern void of_changeset_init(struct of_changeset *ocs);
918 extern void of_changeset_destroy(struct of_changeset *ocs);
919 extern int of_changeset_apply(struct of_changeset *ocs);
920 extern int of_changeset_revert(struct of_changeset *ocs);
921 extern int of_changeset_action(struct of_changeset *ocs,
922 unsigned long action, struct device_node *np,
923 struct property *prop);
925 static inline int of_changeset_attach_node(struct of_changeset *ocs,
926 struct device_node *np)
928 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
931 static inline int of_changeset_detach_node(struct of_changeset *ocs,
932 struct device_node *np)
934 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
937 static inline int of_changeset_add_property(struct of_changeset *ocs,
938 struct device_node *np, struct property *prop)
940 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
943 static inline int of_changeset_remove_property(struct of_changeset *ocs,
944 struct device_node *np, struct property *prop)
946 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
949 static inline int of_changeset_update_property(struct of_changeset *ocs,
950 struct device_node *np, struct property *prop)
952 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
956 /* CONFIG_OF_RESOLVE api */
957 extern int of_resolve_phandles(struct device_node *tree);
960 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
961 * @np: Pointer to the given device_node
963 * return true if present false otherwise
965 static inline bool of_device_is_system_power_controller(const struct device_node *np)
967 return of_property_read_bool(np, "system-power-controller");
970 #endif /* _LINUX_OF_H */