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>
27 #include <asm/byteorder.h>
28 #include <asm/errno.h>
37 struct property
*next
;
39 unsigned int unique_id
;
40 struct bin_attribute attr
;
43 #if defined(CONFIG_SPARC)
44 struct of_irq_controller
;
51 const char *full_name
;
53 struct property
*properties
;
54 struct property
*deadprops
; /* removed properties */
55 struct device_node
*parent
;
56 struct device_node
*child
;
57 struct device_node
*sibling
;
58 struct device_node
*next
; /* next device of same type */
59 struct device_node
*allnext
; /* next in list of all nodes */
63 #if defined(CONFIG_SPARC)
64 const char *path_component_name
;
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 /* initialize a node */
78 extern struct kobj_type of_node_ktype
;
79 static inline void of_node_init(struct device_node
*node
)
81 kobject_init(&node
->kobj
, &of_node_ktype
);
84 /* true when node is initialized */
85 static inline int of_node_is_initialized(struct device_node
*node
)
87 return node
&& node
->kobj
.state_initialized
;
90 /* true when node is attached (i.e. present on sysfs) */
91 static inline int of_node_is_attached(struct device_node
*node
)
93 return node
&& node
->kobj
.state_in_sysfs
;
96 #ifdef CONFIG_OF_DYNAMIC
97 extern struct device_node
*of_node_get(struct device_node
*node
);
98 extern void of_node_put(struct device_node
*node
);
99 #else /* CONFIG_OF_DYNAMIC */
100 /* Dummy ref counting routines - to be implemented later */
101 static inline struct device_node
*of_node_get(struct device_node
*node
)
105 static inline void of_node_put(struct device_node
*node
) { }
106 #endif /* !CONFIG_OF_DYNAMIC */
110 /* Pointer for first entry in chain of all nodes. */
111 extern struct device_node
*of_allnodes
;
112 extern struct device_node
*of_chosen
;
113 extern struct device_node
*of_aliases
;
114 extern struct device_node
*of_stdout
;
115 extern raw_spinlock_t devtree_lock
;
117 static inline bool of_have_populated_dt(void)
119 return of_allnodes
!= NULL
;
122 static inline bool of_node_is_root(const struct device_node
*node
)
124 return node
&& (node
->parent
== NULL
);
127 static inline int of_node_check_flag(struct device_node
*n
, unsigned long flag
)
129 return test_bit(flag
, &n
->_flags
);
132 static inline int of_node_test_and_set_flag(struct device_node
*n
,
135 return test_and_set_bit(flag
, &n
->_flags
);
138 static inline void of_node_set_flag(struct device_node
*n
, unsigned long flag
)
140 set_bit(flag
, &n
->_flags
);
143 static inline void of_node_clear_flag(struct device_node
*n
, unsigned long flag
)
145 clear_bit(flag
, &n
->_flags
);
148 static inline int of_property_check_flag(struct property
*p
, unsigned long flag
)
150 return test_bit(flag
, &p
->_flags
);
153 static inline void of_property_set_flag(struct property
*p
, unsigned long flag
)
155 set_bit(flag
, &p
->_flags
);
158 static inline void of_property_clear_flag(struct property
*p
, unsigned long flag
)
160 clear_bit(flag
, &p
->_flags
);
163 extern struct device_node
*of_find_all_nodes(struct device_node
*prev
);
166 * OF address retrieval & translation
169 /* Helper to read a big number; size is in cells (not bytes) */
170 static inline u64
of_read_number(const __be32
*cell
, int size
)
174 r
= (r
<< 32) | be32_to_cpu(*(cell
++));
178 /* Like of_read_number, but we want an unsigned long result */
179 static inline unsigned long of_read_ulong(const __be32
*cell
, int size
)
181 /* toss away upper bits if unsigned long is smaller than u64 */
182 return of_read_number(cell
, size
);
185 #if defined(CONFIG_SPARC)
186 #include <asm/prom.h>
189 /* Default #address and #size cells. Allow arch asm/prom.h to override */
190 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
191 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
192 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
195 /* Default string compare functions, Allow arch asm/prom.h to override */
196 #if !defined(of_compat_cmp)
197 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
198 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
199 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
202 /* flag descriptions */
203 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
204 #define OF_DETACHED 2 /* node has been detached from the device tree */
205 #define OF_POPULATED 3 /* device already created for the node */
206 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
208 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
209 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
211 #define OF_BAD_ADDR ((u64)-1)
213 static inline const char *of_node_full_name(const struct device_node
*np
)
215 return np
? np
->full_name
: "<no-node>";
218 #define for_each_of_allnodes(dn) \
219 for (dn = of_allnodes; dn; dn = dn->allnext)
220 extern struct device_node
*of_find_node_by_name(struct device_node
*from
,
222 extern struct device_node
*of_find_node_by_type(struct device_node
*from
,
224 extern struct device_node
*of_find_compatible_node(struct device_node
*from
,
225 const char *type
, const char *compat
);
226 extern struct device_node
*of_find_matching_node_and_match(
227 struct device_node
*from
,
228 const struct of_device_id
*matches
,
229 const struct of_device_id
**match
);
231 extern struct device_node
*of_find_node_by_path(const char *path
);
232 extern struct device_node
*of_find_node_by_phandle(phandle handle
);
233 extern struct device_node
*of_get_parent(const struct device_node
*node
);
234 extern struct device_node
*of_get_next_parent(struct device_node
*node
);
235 extern struct device_node
*of_get_next_child(const struct device_node
*node
,
236 struct device_node
*prev
);
237 extern struct device_node
*of_get_next_available_child(
238 const struct device_node
*node
, struct device_node
*prev
);
240 extern struct device_node
*of_get_child_by_name(const struct device_node
*node
,
244 extern struct device_node
*of_find_next_cache_node(const struct device_node
*);
245 extern struct device_node
*of_find_node_with_property(
246 struct device_node
*from
, const char *prop_name
);
248 extern struct property
*of_find_property(const struct device_node
*np
,
251 extern int of_property_count_elems_of_size(const struct device_node
*np
,
252 const char *propname
, int elem_size
);
253 extern int of_property_read_u32_index(const struct device_node
*np
,
254 const char *propname
,
255 u32 index
, u32
*out_value
);
256 extern int of_property_read_u8_array(const struct device_node
*np
,
257 const char *propname
, u8
*out_values
, size_t sz
);
258 extern int of_property_read_u16_array(const struct device_node
*np
,
259 const char *propname
, u16
*out_values
, size_t sz
);
260 extern int of_property_read_u32_array(const struct device_node
*np
,
261 const char *propname
,
264 extern int of_property_read_u64(const struct device_node
*np
,
265 const char *propname
, u64
*out_value
);
267 extern int of_property_read_string(struct device_node
*np
,
268 const char *propname
,
269 const char **out_string
);
270 extern int of_property_match_string(struct device_node
*np
,
271 const char *propname
,
273 extern int of_property_read_string_helper(struct device_node
*np
,
274 const char *propname
,
275 const char **out_strs
, size_t sz
, int index
);
276 extern int of_device_is_compatible(const struct device_node
*device
,
278 extern int of_device_is_available(const struct device_node
*device
);
279 extern const void *of_get_property(const struct device_node
*node
,
282 extern struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
);
283 #define for_each_property_of_node(dn, pp) \
284 for (pp = dn->properties; pp != NULL; pp = pp->next)
286 extern int of_n_addr_cells(struct device_node
*np
);
287 extern int of_n_size_cells(struct device_node
*np
);
288 extern const struct of_device_id
*of_match_node(
289 const struct of_device_id
*matches
, const struct device_node
*node
);
290 extern int of_modalias_node(struct device_node
*node
, char *modalias
, int len
);
291 extern void of_print_phandle_args(const char *msg
, const struct of_phandle_args
*args
);
292 extern struct device_node
*of_parse_phandle(const struct device_node
*np
,
293 const char *phandle_name
,
295 extern int of_parse_phandle_with_args(const struct device_node
*np
,
296 const char *list_name
, const char *cells_name
, int index
,
297 struct of_phandle_args
*out_args
);
298 extern int of_parse_phandle_with_fixed_args(const struct device_node
*np
,
299 const char *list_name
, int cells_count
, int index
,
300 struct of_phandle_args
*out_args
);
301 extern int of_count_phandle_with_args(const struct device_node
*np
,
302 const char *list_name
, const char *cells_name
);
304 extern void of_alias_scan(void * (*dt_alloc
)(u64 size
, u64 align
));
305 extern int of_alias_get_id(struct device_node
*np
, const char *stem
);
307 extern int of_machine_is_compatible(const char *compat
);
309 extern int of_add_property(struct device_node
*np
, struct property
*prop
);
310 extern int of_remove_property(struct device_node
*np
, struct property
*prop
);
311 extern int of_update_property(struct device_node
*np
, struct property
*newprop
);
313 /* For updating the device tree at runtime */
314 #define OF_RECONFIG_ATTACH_NODE 0x0001
315 #define OF_RECONFIG_DETACH_NODE 0x0002
316 #define OF_RECONFIG_ADD_PROPERTY 0x0003
317 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
318 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
320 struct of_prop_reconfig
{
321 struct device_node
*dn
;
322 struct property
*prop
;
323 struct property
*old_prop
;
326 extern int of_reconfig_notifier_register(struct notifier_block
*);
327 extern int of_reconfig_notifier_unregister(struct notifier_block
*);
328 extern int of_reconfig_notify(unsigned long, void *);
330 extern int of_attach_node(struct device_node
*);
331 extern int of_detach_node(struct device_node
*);
333 #define of_match_ptr(_ptr) (_ptr)
336 * struct property *prop;
340 * of_property_for_each_u32(np, "propname", prop, p, u)
341 * printk("U32 value: %x\n", u);
343 const __be32
*of_prop_next_u32(struct property
*prop
, const __be32
*cur
,
346 * struct property *prop;
349 * of_property_for_each_string(np, "propname", prop, s)
350 * printk("String value: %s\n", s);
352 const char *of_prop_next_string(struct property
*prop
, const char *cur
);
354 bool of_console_check(struct device_node
*dn
, char *name
, int index
);
356 #else /* CONFIG_OF */
358 static inline const char* of_node_full_name(const struct device_node
*np
)
363 static inline struct device_node
*of_find_node_by_name(struct device_node
*from
,
369 static inline struct device_node
*of_find_node_by_type(struct device_node
*from
,
375 static inline struct device_node
*of_find_matching_node_and_match(
376 struct device_node
*from
,
377 const struct of_device_id
*matches
,
378 const struct of_device_id
**match
)
383 static inline struct device_node
*of_find_node_by_path(const char *path
)
388 static inline struct device_node
*of_get_parent(const struct device_node
*node
)
393 static inline struct device_node
*of_get_next_child(
394 const struct device_node
*node
, struct device_node
*prev
)
399 static inline struct device_node
*of_get_next_available_child(
400 const struct device_node
*node
, struct device_node
*prev
)
405 static inline struct device_node
*of_find_node_with_property(
406 struct device_node
*from
, const char *prop_name
)
411 static inline bool of_have_populated_dt(void)
416 static inline struct device_node
*of_get_child_by_name(
417 const struct device_node
*node
,
423 static inline int of_device_is_compatible(const struct device_node
*device
,
429 static inline int of_device_is_available(const struct device_node
*device
)
434 static inline struct property
*of_find_property(const struct device_node
*np
,
441 static inline struct device_node
*of_find_compatible_node(
442 struct device_node
*from
,
449 static inline int of_property_count_elems_of_size(const struct device_node
*np
,
450 const char *propname
, int elem_size
)
455 static inline int of_property_read_u32_index(const struct device_node
*np
,
456 const char *propname
, u32 index
, u32
*out_value
)
461 static inline int of_property_read_u8_array(const struct device_node
*np
,
462 const char *propname
, u8
*out_values
, size_t sz
)
467 static inline int of_property_read_u16_array(const struct device_node
*np
,
468 const char *propname
, u16
*out_values
, size_t sz
)
473 static inline int of_property_read_u32_array(const struct device_node
*np
,
474 const char *propname
,
475 u32
*out_values
, size_t sz
)
480 static inline int of_property_read_string(struct device_node
*np
,
481 const char *propname
,
482 const char **out_string
)
487 static inline int of_property_read_string_helper(struct device_node
*np
,
488 const char *propname
,
489 const char **out_strs
, size_t sz
, int index
)
494 static inline const void *of_get_property(const struct device_node
*node
,
501 static inline struct device_node
*of_get_cpu_node(int cpu
,
502 unsigned int *thread
)
507 static inline int of_property_read_u64(const struct device_node
*np
,
508 const char *propname
, u64
*out_value
)
513 static inline int of_property_match_string(struct device_node
*np
,
514 const char *propname
,
520 static inline struct device_node
*of_parse_phandle(const struct device_node
*np
,
521 const char *phandle_name
,
527 static inline int of_parse_phandle_with_args(struct device_node
*np
,
528 const char *list_name
,
529 const char *cells_name
,
531 struct of_phandle_args
*out_args
)
536 static inline int of_parse_phandle_with_fixed_args(const struct device_node
*np
,
537 const char *list_name
, int cells_count
, int index
,
538 struct of_phandle_args
*out_args
)
543 static inline int of_count_phandle_with_args(struct device_node
*np
,
544 const char *list_name
,
545 const char *cells_name
)
550 static inline int of_alias_get_id(struct device_node
*np
, const char *stem
)
555 static inline int of_machine_is_compatible(const char *compat
)
560 static inline bool of_console_check(const struct device_node
*dn
, const char *name
, int index
)
565 static inline const __be32
*of_prop_next_u32(struct property
*prop
,
566 const __be32
*cur
, u32
*pu
)
571 static inline const char *of_prop_next_string(struct property
*prop
,
577 #define of_match_ptr(_ptr) NULL
578 #define of_match_node(_matches, _node) NULL
579 #endif /* CONFIG_OF */
581 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
582 extern int of_node_to_nid(struct device_node
*np
);
584 static inline int of_node_to_nid(struct device_node
*device
) { return 0; }
587 static inline struct device_node
*of_find_matching_node(
588 struct device_node
*from
,
589 const struct of_device_id
*matches
)
591 return of_find_matching_node_and_match(from
, matches
, NULL
);
595 * of_property_count_u8_elems - Count the number of u8 elements in a property
597 * @np: device node from which the property value is to be read.
598 * @propname: name of the property to be searched.
600 * Search for a property in a device node and count the number of u8 elements
601 * in it. Returns number of elements on sucess, -EINVAL if the property does
602 * not exist or its length does not match a multiple of u8 and -ENODATA if the
603 * property does not have a value.
605 static inline int of_property_count_u8_elems(const struct device_node
*np
,
606 const char *propname
)
608 return of_property_count_elems_of_size(np
, propname
, sizeof(u8
));
612 * of_property_count_u16_elems - Count the number of u16 elements in a property
614 * @np: device node from which the property value is to be read.
615 * @propname: name of the property to be searched.
617 * Search for a property in a device node and count the number of u16 elements
618 * in it. Returns number of elements on sucess, -EINVAL if the property does
619 * not exist or its length does not match a multiple of u16 and -ENODATA if the
620 * property does not have a value.
622 static inline int of_property_count_u16_elems(const struct device_node
*np
,
623 const char *propname
)
625 return of_property_count_elems_of_size(np
, propname
, sizeof(u16
));
629 * of_property_count_u32_elems - Count the number of u32 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 u32 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 u32 and -ENODATA if the
637 * property does not have a value.
639 static inline int of_property_count_u32_elems(const struct device_node
*np
,
640 const char *propname
)
642 return of_property_count_elems_of_size(np
, propname
, sizeof(u32
));
646 * of_property_count_u64_elems - Count the number of u64 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 u64 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 u64 and -ENODATA if the
654 * property does not have a value.
656 static inline int of_property_count_u64_elems(const struct device_node
*np
,
657 const char *propname
)
659 return of_property_count_elems_of_size(np
, propname
, sizeof(u64
));
663 * of_property_read_string_array() - Read an array of strings from a multiple
665 * @np: device node from which the property value is to be read.
666 * @propname: name of the property to be searched.
667 * @out_strs: output array of string pointers.
668 * @sz: number of array elements to read.
670 * Search for a property in a device tree node and retrieve a list of
671 * terminated string values (pointer to data, not a copy) in that property.
673 * If @out_strs is NULL, the number of strings in the property is returned.
675 static inline int of_property_read_string_array(struct device_node
*np
,
676 const char *propname
, const char **out_strs
,
679 return of_property_read_string_helper(np
, propname
, out_strs
, sz
, 0);
683 * of_property_count_strings() - Find and return the number of strings from a
684 * multiple strings property.
685 * @np: device node from which the property value is to be read.
686 * @propname: name of the property to be searched.
688 * Search for a property in a device tree node and retrieve the number of null
689 * terminated string contain in it. Returns the number of strings on
690 * success, -EINVAL if the property does not exist, -ENODATA if property
691 * does not have a value, and -EILSEQ if the string is not null-terminated
692 * within the length of the property data.
694 static inline int of_property_count_strings(struct device_node
*np
,
695 const char *propname
)
697 return of_property_read_string_helper(np
, propname
, NULL
, 0, 0);
701 * of_property_read_string_index() - Find and read a string from a multiple
703 * @np: device node from which the property value is to be read.
704 * @propname: name of the property to be searched.
705 * @index: index of the string in the list of strings
706 * @out_string: pointer to null terminated return string, modified only if
709 * Search for a property in a device tree node and retrieve a null
710 * terminated string value (pointer to data, not a copy) in the list of strings
711 * contained in that property.
712 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
713 * property does not have a value, and -EILSEQ if the string is not
714 * null-terminated within the length of the property data.
716 * The out_string pointer is modified only if a valid string can be decoded.
718 static inline int of_property_read_string_index(struct device_node
*np
,
719 const char *propname
,
720 int index
, const char **output
)
722 int rc
= of_property_read_string_helper(np
, propname
, output
, 1, index
);
723 return rc
< 0 ? rc
: 0;
727 * of_property_read_bool - Findfrom a property
728 * @np: device node from which the property value is to be read.
729 * @propname: name of the property to be searched.
731 * Search for a property in a device node.
732 * Returns true if the property exist false otherwise.
734 static inline bool of_property_read_bool(const struct device_node
*np
,
735 const char *propname
)
737 struct property
*prop
= of_find_property(np
, propname
, NULL
);
739 return prop
? true : false;
742 static inline int of_property_read_u8(const struct device_node
*np
,
743 const char *propname
,
746 return of_property_read_u8_array(np
, propname
, out_value
, 1);
749 static inline int of_property_read_u16(const struct device_node
*np
,
750 const char *propname
,
753 return of_property_read_u16_array(np
, propname
, out_value
, 1);
756 static inline int of_property_read_u32(const struct device_node
*np
,
757 const char *propname
,
760 return of_property_read_u32_array(np
, propname
, out_value
, 1);
763 #define of_property_for_each_u32(np, propname, prop, p, u) \
764 for (prop = of_find_property(np, propname, NULL), \
765 p = of_prop_next_u32(prop, NULL, &u); \
767 p = of_prop_next_u32(prop, p, &u))
769 #define of_property_for_each_string(np, propname, prop, s) \
770 for (prop = of_find_property(np, propname, NULL), \
771 s = of_prop_next_string(prop, NULL); \
773 s = of_prop_next_string(prop, s))
775 #define for_each_node_by_name(dn, name) \
776 for (dn = of_find_node_by_name(NULL, name); dn; \
777 dn = of_find_node_by_name(dn, name))
778 #define for_each_node_by_type(dn, type) \
779 for (dn = of_find_node_by_type(NULL, type); dn; \
780 dn = of_find_node_by_type(dn, type))
781 #define for_each_compatible_node(dn, type, compatible) \
782 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
783 dn = of_find_compatible_node(dn, type, compatible))
784 #define for_each_matching_node(dn, matches) \
785 for (dn = of_find_matching_node(NULL, matches); dn; \
786 dn = of_find_matching_node(dn, matches))
787 #define for_each_matching_node_and_match(dn, matches, match) \
788 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
789 dn; dn = of_find_matching_node_and_match(dn, matches, match))
791 #define for_each_child_of_node(parent, child) \
792 for (child = of_get_next_child(parent, NULL); child != NULL; \
793 child = of_get_next_child(parent, child))
794 #define for_each_available_child_of_node(parent, child) \
795 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
796 child = of_get_next_available_child(parent, child))
798 #define for_each_node_with_property(dn, prop_name) \
799 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
800 dn = of_find_node_with_property(dn, prop_name))
802 static inline int of_get_child_count(const struct device_node
*np
)
804 struct device_node
*child
;
807 for_each_child_of_node(np
, child
)
813 static inline int of_get_available_child_count(const struct device_node
*np
)
815 struct device_node
*child
;
818 for_each_available_child_of_node(np
, child
)
825 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
826 static const struct of_device_id __of_table_##name \
827 __used __section(__##table##_of_table) \
828 = { .compatible = compat, \
829 .data = (fn == (fn_type)NULL) ? fn : fn }
831 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
832 static const struct of_device_id __of_table_##name \
833 __attribute__((unused)) \
834 = { .compatible = compat, \
835 .data = (fn == (fn_type)NULL) ? fn : fn }
838 typedef int (*of_init_fn_2
)(struct device_node
*, struct device_node
*);
839 typedef void (*of_init_fn_1
)(struct device_node
*);
841 #define OF_DECLARE_1(table, name, compat, fn) \
842 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
843 #define OF_DECLARE_2(table, name, compat, fn) \
844 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
847 * struct of_changeset_entry - Holds a changeset entry
849 * @node: list_head for the log list
850 * @action: notifier action
851 * @np: pointer to the device node affected
852 * @prop: pointer to the property affected
853 * @old_prop: hold a pointer to the original property
855 * Every modification of the device tree during a changeset
856 * is held in a list of of_changeset_entry structures.
857 * That way we can recover from a partial application, or we can
858 * revert the changeset
860 struct of_changeset_entry
{
861 struct list_head node
;
862 unsigned long action
;
863 struct device_node
*np
;
864 struct property
*prop
;
865 struct property
*old_prop
;
869 * struct of_changeset - changeset tracker structure
871 * @entries: list_head for the changeset entries
873 * changesets are a convenient way to apply bulk changes to the
874 * live tree. In case of an error, changes are rolled-back.
875 * changesets live on after initial application, and if not
876 * destroyed after use, they can be reverted in one single call.
878 struct of_changeset
{
879 struct list_head entries
;
882 #ifdef CONFIG_OF_DYNAMIC
883 extern void of_changeset_init(struct of_changeset
*ocs
);
884 extern void of_changeset_destroy(struct of_changeset
*ocs
);
885 extern int of_changeset_apply(struct of_changeset
*ocs
);
886 extern int of_changeset_revert(struct of_changeset
*ocs
);
887 extern int of_changeset_action(struct of_changeset
*ocs
,
888 unsigned long action
, struct device_node
*np
,
889 struct property
*prop
);
891 static inline int of_changeset_attach_node(struct of_changeset
*ocs
,
892 struct device_node
*np
)
894 return of_changeset_action(ocs
, OF_RECONFIG_ATTACH_NODE
, np
, NULL
);
897 static inline int of_changeset_detach_node(struct of_changeset
*ocs
,
898 struct device_node
*np
)
900 return of_changeset_action(ocs
, OF_RECONFIG_DETACH_NODE
, np
, NULL
);
903 static inline int of_changeset_add_property(struct of_changeset
*ocs
,
904 struct device_node
*np
, struct property
*prop
)
906 return of_changeset_action(ocs
, OF_RECONFIG_ADD_PROPERTY
, np
, prop
);
909 static inline int of_changeset_remove_property(struct of_changeset
*ocs
,
910 struct device_node
*np
, struct property
*prop
)
912 return of_changeset_action(ocs
, OF_RECONFIG_REMOVE_PROPERTY
, np
, prop
);
915 static inline int of_changeset_update_property(struct of_changeset
*ocs
,
916 struct device_node
*np
, struct property
*prop
)
918 return of_changeset_action(ocs
, OF_RECONFIG_UPDATE_PROPERTY
, np
, prop
);
922 /* CONFIG_OF_RESOLVE api */
923 extern int of_resolve_phandles(struct device_node
*tree
);
926 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
927 * @np: Pointer to the given device_node
929 * return true if present false otherwise
931 static inline bool of_device_is_system_power_controller(const struct device_node
*np
)
933 return of_property_read_bool(np
, "system-power-controller");
936 #endif /* _LINUX_OF_H */