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Linux/include/linux/of.h

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  1 /* SPDX-License-Identifier: GPL-2.0+ */
  2 #ifndef _LINUX_OF_H
  3 #define _LINUX_OF_H
  4 /*
  5  * Definitions for talking to the Open Firmware PROM on
  6  * Power Macintosh and other computers.
  7  *
  8  * Copyright (C) 1996-2005 Paul Mackerras.
  9  *
 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.
 13  */
 14 #include <linux/types.h>
 15 #include <linux/bitops.h>
 16 #include <linux/errno.h>
 17 #include <linux/kobject.h>
 18 #include <linux/mod_devicetable.h>
 19 #include <linux/spinlock.h>
 20 #include <linux/topology.h>
 21 #include <linux/notifier.h>
 22 #include <linux/property.h>
 23 #include <linux/list.h>
 24 
 25 #include <asm/byteorder.h>
 26 #include <asm/errno.h>
 27 
 28 typedef u32 phandle;
 29 typedef u32 ihandle;
 30 
 31 struct property {
 32         char    *name;
 33         int     length;
 34         void    *value;
 35         struct property *next;
 36 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
 37         unsigned long _flags;
 38 #endif
 39 #if defined(CONFIG_OF_PROMTREE)
 40         unsigned int unique_id;
 41 #endif
 42 #if defined(CONFIG_OF_KOBJ)
 43         struct bin_attribute attr;
 44 #endif
 45 };
 46 
 47 #if defined(CONFIG_SPARC)
 48 struct of_irq_controller;
 49 #endif
 50 
 51 struct device_node {
 52         const char *name;
 53         phandle phandle;
 54         const char *full_name;
 55         struct fwnode_handle fwnode;
 56 
 57         struct  property *properties;
 58         struct  property *deadprops;    /* removed properties */
 59         struct  device_node *parent;
 60         struct  device_node *child;
 61         struct  device_node *sibling;
 62 #if defined(CONFIG_OF_KOBJ)
 63         struct  kobject kobj;
 64 #endif
 65         unsigned long _flags;
 66         void    *data;
 67 #if defined(CONFIG_SPARC)
 68         unsigned int unique_id;
 69         struct of_irq_controller *irq_trans;
 70 #endif
 71 };
 72 
 73 #define MAX_PHANDLE_ARGS 16
 74 struct of_phandle_args {
 75         struct device_node *np;
 76         int args_count;
 77         uint32_t args[MAX_PHANDLE_ARGS];
 78 };
 79 
 80 struct of_phandle_iterator {
 81         /* Common iterator information */
 82         const char *cells_name;
 83         int cell_count;
 84         const struct device_node *parent;
 85 
 86         /* List size information */
 87         const __be32 *list_end;
 88         const __be32 *phandle_end;
 89 
 90         /* Current position state */
 91         const __be32 *cur;
 92         uint32_t cur_count;
 93         phandle phandle;
 94         struct device_node *node;
 95 };
 96 
 97 struct of_reconfig_data {
 98         struct device_node      *dn;
 99         struct property         *prop;
100         struct property         *old_prop;
101 };
102 
103 /* initialize a node */
104 extern struct kobj_type of_node_ktype;
105 extern const struct fwnode_operations of_fwnode_ops;
106 static inline void of_node_init(struct device_node *node)
107 {
108 #if defined(CONFIG_OF_KOBJ)
109         kobject_init(&node->kobj, &of_node_ktype);
110 #endif
111         node->fwnode.ops = &of_fwnode_ops;
112 }
113 
114 #if defined(CONFIG_OF_KOBJ)
115 #define of_node_kobj(n) (&(n)->kobj)
116 #else
117 #define of_node_kobj(n) NULL
118 #endif
119 
120 #ifdef CONFIG_OF_DYNAMIC
121 extern struct device_node *of_node_get(struct device_node *node);
122 extern void of_node_put(struct device_node *node);
123 #else /* CONFIG_OF_DYNAMIC */
124 /* Dummy ref counting routines - to be implemented later */
125 static inline struct device_node *of_node_get(struct device_node *node)
126 {
127         return node;
128 }
129 static inline void of_node_put(struct device_node *node) { }
130 #endif /* !CONFIG_OF_DYNAMIC */
131 
132 /* Pointer for first entry in chain of all nodes. */
133 extern struct device_node *of_root;
134 extern struct device_node *of_chosen;
135 extern struct device_node *of_aliases;
136 extern struct device_node *of_stdout;
137 extern raw_spinlock_t devtree_lock;
138 
139 /*
140  * struct device_node flag descriptions
141  * (need to be visible even when !CONFIG_OF)
142  */
143 #define OF_DYNAMIC              1 /* (and properties) allocated via kmalloc */
144 #define OF_DETACHED             2 /* detached from the device tree */
145 #define OF_POPULATED            3 /* device already created */
146 #define OF_POPULATED_BUS        4 /* platform bus created for children */
147 #define OF_OVERLAY              5 /* allocated for an overlay */
148 #define OF_OVERLAY_FREE_CSET    6 /* in overlay cset being freed */
149 
150 #define OF_BAD_ADDR     ((u64)-1)
151 
152 #ifdef CONFIG_OF
153 void of_core_init(void);
154 
155 static inline bool is_of_node(const struct fwnode_handle *fwnode)
156 {
157         return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops;
158 }
159 
160 #define to_of_node(__fwnode)                                            \
161         ({                                                              \
162                 typeof(__fwnode) __to_of_node_fwnode = (__fwnode);      \
163                                                                         \
164                 is_of_node(__to_of_node_fwnode) ?                       \
165                         container_of(__to_of_node_fwnode,               \
166                                      struct device_node, fwnode) :      \
167                         NULL;                                           \
168         })
169 
170 #define of_fwnode_handle(node)                                          \
171         ({                                                              \
172                 typeof(node) __of_fwnode_handle_node = (node);          \
173                                                                         \
174                 __of_fwnode_handle_node ?                               \
175                         &__of_fwnode_handle_node->fwnode : NULL;        \
176         })
177 
178 static inline bool of_have_populated_dt(void)
179 {
180         return of_root != NULL;
181 }
182 
183 static inline bool of_node_is_root(const struct device_node *node)
184 {
185         return node && (node->parent == NULL);
186 }
187 
188 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
189 {
190         return test_bit(flag, &n->_flags);
191 }
192 
193 static inline int of_node_test_and_set_flag(struct device_node *n,
194                                             unsigned long flag)
195 {
196         return test_and_set_bit(flag, &n->_flags);
197 }
198 
199 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
200 {
201         set_bit(flag, &n->_flags);
202 }
203 
204 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
205 {
206         clear_bit(flag, &n->_flags);
207 }
208 
209 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
210 static inline int of_property_check_flag(struct property *p, unsigned long flag)
211 {
212         return test_bit(flag, &p->_flags);
213 }
214 
215 static inline void of_property_set_flag(struct property *p, unsigned long flag)
216 {
217         set_bit(flag, &p->_flags);
218 }
219 
220 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
221 {
222         clear_bit(flag, &p->_flags);
223 }
224 #endif
225 
226 extern struct device_node *__of_find_all_nodes(struct device_node *prev);
227 extern struct device_node *of_find_all_nodes(struct device_node *prev);
228 
229 /*
230  * OF address retrieval & translation
231  */
232 
233 /* Helper to read a big number; size is in cells (not bytes) */
234 static inline u64 of_read_number(const __be32 *cell, int size)
235 {
236         u64 r = 0;
237         for (; size--; cell++)
238                 r = (r << 32) | be32_to_cpu(*cell);
239         return r;
240 }
241 
242 /* Like of_read_number, but we want an unsigned long result */
243 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
244 {
245         /* toss away upper bits if unsigned long is smaller than u64 */
246         return of_read_number(cell, size);
247 }
248 
249 #if defined(CONFIG_SPARC)
250 #include <asm/prom.h>
251 #endif
252 
253 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
254 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
255 
256 extern bool of_node_name_eq(const struct device_node *np, const char *name);
257 extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);
258 
259 static inline const char *of_node_full_name(const struct device_node *np)
260 {
261         return np ? np->full_name : "<no-node>";
262 }
263 
264 #define for_each_of_allnodes_from(from, dn) \
265         for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
266 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
267 extern struct device_node *of_find_node_by_name(struct device_node *from,
268         const char *name);
269 extern struct device_node *of_find_node_by_type(struct device_node *from,
270         const char *type);
271 extern struct device_node *of_find_compatible_node(struct device_node *from,
272         const char *type, const char *compat);
273 extern struct device_node *of_find_matching_node_and_match(
274         struct device_node *from,
275         const struct of_device_id *matches,
276         const struct of_device_id **match);
277 
278 extern struct device_node *of_find_node_opts_by_path(const char *path,
279         const char **opts);
280 static inline struct device_node *of_find_node_by_path(const char *path)
281 {
282         return of_find_node_opts_by_path(path, NULL);
283 }
284 
285 extern struct device_node *of_find_node_by_phandle(phandle handle);
286 extern struct device_node *of_get_parent(const struct device_node *node);
287 extern struct device_node *of_get_next_parent(struct device_node *node);
288 extern struct device_node *of_get_next_child(const struct device_node *node,
289                                              struct device_node *prev);
290 extern struct device_node *of_get_next_available_child(
291         const struct device_node *node, struct device_node *prev);
292 
293 extern struct device_node *of_get_compatible_child(const struct device_node *parent,
294                                         const char *compatible);
295 extern struct device_node *of_get_child_by_name(const struct device_node *node,
296                                         const char *name);
297 
298 /* cache lookup */
299 extern struct device_node *of_find_next_cache_node(const struct device_node *);
300 extern int of_find_last_cache_level(unsigned int cpu);
301 extern struct device_node *of_find_node_with_property(
302         struct device_node *from, const char *prop_name);
303 
304 extern struct property *of_find_property(const struct device_node *np,
305                                          const char *name,
306                                          int *lenp);
307 extern int of_property_count_elems_of_size(const struct device_node *np,
308                                 const char *propname, int elem_size);
309 extern int of_property_read_u32_index(const struct device_node *np,
310                                        const char *propname,
311                                        u32 index, u32 *out_value);
312 extern int of_property_read_u64_index(const struct device_node *np,
313                                        const char *propname,
314                                        u32 index, u64 *out_value);
315 extern int of_property_read_variable_u8_array(const struct device_node *np,
316                                         const char *propname, u8 *out_values,
317                                         size_t sz_min, size_t sz_max);
318 extern int of_property_read_variable_u16_array(const struct device_node *np,
319                                         const char *propname, u16 *out_values,
320                                         size_t sz_min, size_t sz_max);
321 extern int of_property_read_variable_u32_array(const struct device_node *np,
322                                         const char *propname,
323                                         u32 *out_values,
324                                         size_t sz_min,
325                                         size_t sz_max);
326 extern int of_property_read_u64(const struct device_node *np,
327                                 const char *propname, u64 *out_value);
328 extern int of_property_read_variable_u64_array(const struct device_node *np,
329                                         const char *propname,
330                                         u64 *out_values,
331                                         size_t sz_min,
332                                         size_t sz_max);
333 
334 extern int of_property_read_string(const struct device_node *np,
335                                    const char *propname,
336                                    const char **out_string);
337 extern int of_property_match_string(const struct device_node *np,
338                                     const char *propname,
339                                     const char *string);
340 extern int of_property_read_string_helper(const struct device_node *np,
341                                               const char *propname,
342                                               const char **out_strs, size_t sz, int index);
343 extern int of_device_is_compatible(const struct device_node *device,
344                                    const char *);
345 extern int of_device_compatible_match(struct device_node *device,
346                                       const char *const *compat);
347 extern bool of_device_is_available(const struct device_node *device);
348 extern bool of_device_is_big_endian(const struct device_node *device);
349 extern const void *of_get_property(const struct device_node *node,
350                                 const char *name,
351                                 int *lenp);
352 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
353 extern struct device_node *of_get_next_cpu_node(struct device_node *prev);
354 extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
355                                                  int index);
356 
357 #define for_each_property_of_node(dn, pp) \
358         for (pp = dn->properties; pp != NULL; pp = pp->next)
359 
360 extern int of_n_addr_cells(struct device_node *np);
361 extern int of_n_size_cells(struct device_node *np);
362 extern const struct of_device_id *of_match_node(
363         const struct of_device_id *matches, const struct device_node *node);
364 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
365 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
366 extern struct device_node *of_parse_phandle(const struct device_node *np,
367                                             const char *phandle_name,
368                                             int index);
369 extern int of_parse_phandle_with_args(const struct device_node *np,
370         const char *list_name, const char *cells_name, int index,
371         struct of_phandle_args *out_args);
372 extern int of_parse_phandle_with_args_map(const struct device_node *np,
373         const char *list_name, const char *stem_name, int index,
374         struct of_phandle_args *out_args);
375 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
376         const char *list_name, int cells_count, int index,
377         struct of_phandle_args *out_args);
378 extern int of_count_phandle_with_args(const struct device_node *np,
379         const char *list_name, const char *cells_name);
380 
381 /* phandle iterator functions */
382 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
383                                     const struct device_node *np,
384                                     const char *list_name,
385                                     const char *cells_name,
386                                     int cell_count);
387 
388 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
389 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
390                                     uint32_t *args,
391                                     int size);
392 
393 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
394 extern int of_alias_get_id(struct device_node *np, const char *stem);
395 extern int of_alias_get_highest_id(const char *stem);
396 extern int of_alias_get_alias_list(const struct of_device_id *matches,
397                                    const char *stem, unsigned long *bitmap,
398                                    unsigned int nbits);
399 
400 extern int of_machine_is_compatible(const char *compat);
401 
402 extern int of_add_property(struct device_node *np, struct property *prop);
403 extern int of_remove_property(struct device_node *np, struct property *prop);
404 extern int of_update_property(struct device_node *np, struct property *newprop);
405 
406 /* For updating the device tree at runtime */
407 #define OF_RECONFIG_ATTACH_NODE         0x0001
408 #define OF_RECONFIG_DETACH_NODE         0x0002
409 #define OF_RECONFIG_ADD_PROPERTY        0x0003
410 #define OF_RECONFIG_REMOVE_PROPERTY     0x0004
411 #define OF_RECONFIG_UPDATE_PROPERTY     0x0005
412 
413 extern int of_attach_node(struct device_node *);
414 extern int of_detach_node(struct device_node *);
415 
416 #define of_match_ptr(_ptr)      (_ptr)
417 
418 /**
419  * of_property_read_u8_array - Find and read an array of u8 from a property.
420  *
421  * @np:         device node from which the property value is to be read.
422  * @propname:   name of the property to be searched.
423  * @out_values: pointer to return value, modified only if return value is 0.
424  * @sz:         number of array elements to read
425  *
426  * Search for a property in a device node and read 8-bit value(s) from
427  * it. Returns 0 on success, -EINVAL if the property does not exist,
428  * -ENODATA if property does not have a value, and -EOVERFLOW if the
429  * property data isn't large enough.
430  *
431  * dts entry of array should be like:
432  *      property = /bits/ 8 <0x50 0x60 0x70>;
433  *
434  * The out_values is modified only if a valid u8 value can be decoded.
435  */
436 static inline int of_property_read_u8_array(const struct device_node *np,
437                                             const char *propname,
438                                             u8 *out_values, size_t sz)
439 {
440         int ret = of_property_read_variable_u8_array(np, propname, out_values,
441                                                      sz, 0);
442         if (ret >= 0)
443                 return 0;
444         else
445                 return ret;
446 }
447 
448 /**
449  * of_property_read_u16_array - Find and read an array of u16 from a property.
450  *
451  * @np:         device node from which the property value is to be read.
452  * @propname:   name of the property to be searched.
453  * @out_values: pointer to return value, modified only if return value is 0.
454  * @sz:         number of array elements to read
455  *
456  * Search for a property in a device node and read 16-bit value(s) from
457  * it. Returns 0 on success, -EINVAL if the property does not exist,
458  * -ENODATA if property does not have a value, and -EOVERFLOW if the
459  * property data isn't large enough.
460  *
461  * dts entry of array should be like:
462  *      property = /bits/ 16 <0x5000 0x6000 0x7000>;
463  *
464  * The out_values is modified only if a valid u16 value can be decoded.
465  */
466 static inline int of_property_read_u16_array(const struct device_node *np,
467                                              const char *propname,
468                                              u16 *out_values, size_t sz)
469 {
470         int ret = of_property_read_variable_u16_array(np, propname, out_values,
471                                                       sz, 0);
472         if (ret >= 0)
473                 return 0;
474         else
475                 return ret;
476 }
477 
478 /**
479  * of_property_read_u32_array - Find and read an array of 32 bit integers
480  * from a property.
481  *
482  * @np:         device node from which the property value is to be read.
483  * @propname:   name of the property to be searched.
484  * @out_values: pointer to return value, modified only if return value is 0.
485  * @sz:         number of array elements to read
486  *
487  * Search for a property in a device node and read 32-bit value(s) from
488  * it. Returns 0 on success, -EINVAL if the property does not exist,
489  * -ENODATA if property does not have a value, and -EOVERFLOW if the
490  * property data isn't large enough.
491  *
492  * The out_values is modified only if a valid u32 value can be decoded.
493  */
494 static inline int of_property_read_u32_array(const struct device_node *np,
495                                              const char *propname,
496                                              u32 *out_values, size_t sz)
497 {
498         int ret = of_property_read_variable_u32_array(np, propname, out_values,
499                                                       sz, 0);
500         if (ret >= 0)
501                 return 0;
502         else
503                 return ret;
504 }
505 
506 /**
507  * of_property_read_u64_array - Find and read an array of 64 bit integers
508  * from a property.
509  *
510  * @np:         device node from which the property value is to be read.
511  * @propname:   name of the property to be searched.
512  * @out_values: pointer to return value, modified only if return value is 0.
513  * @sz:         number of array elements to read
514  *
515  * Search for a property in a device node and read 64-bit value(s) from
516  * it. Returns 0 on success, -EINVAL if the property does not exist,
517  * -ENODATA if property does not have a value, and -EOVERFLOW if the
518  * property data isn't large enough.
519  *
520  * The out_values is modified only if a valid u64 value can be decoded.
521  */
522 static inline int of_property_read_u64_array(const struct device_node *np,
523                                              const char *propname,
524                                              u64 *out_values, size_t sz)
525 {
526         int ret = of_property_read_variable_u64_array(np, propname, out_values,
527                                                       sz, 0);
528         if (ret >= 0)
529                 return 0;
530         else
531                 return ret;
532 }
533 
534 /*
535  * struct property *prop;
536  * const __be32 *p;
537  * u32 u;
538  *
539  * of_property_for_each_u32(np, "propname", prop, p, u)
540  *         printk("U32 value: %x\n", u);
541  */
542 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
543                                u32 *pu);
544 /*
545  * struct property *prop;
546  * const char *s;
547  *
548  * of_property_for_each_string(np, "propname", prop, s)
549  *         printk("String value: %s\n", s);
550  */
551 const char *of_prop_next_string(struct property *prop, const char *cur);
552 
553 bool of_console_check(struct device_node *dn, char *name, int index);
554 
555 extern int of_cpu_node_to_id(struct device_node *np);
556 
557 int of_map_rid(struct device_node *np, u32 rid,
558                const char *map_name, const char *map_mask_name,
559                struct device_node **target, u32 *id_out);
560 
561 #else /* CONFIG_OF */
562 
563 static inline void of_core_init(void)
564 {
565 }
566 
567 static inline bool is_of_node(const struct fwnode_handle *fwnode)
568 {
569         return false;
570 }
571 
572 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
573 {
574         return NULL;
575 }
576 
577 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
578 {
579         return false;
580 }
581 
582 static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
583 {
584         return false;
585 }
586 
587 static inline const char* of_node_full_name(const struct device_node *np)
588 {
589         return "<no-node>";
590 }
591 
592 static inline struct device_node *of_find_node_by_name(struct device_node *from,
593         const char *name)
594 {
595         return NULL;
596 }
597 
598 static inline struct device_node *of_find_node_by_type(struct device_node *from,
599         const char *type)
600 {
601         return NULL;
602 }
603 
604 static inline struct device_node *of_find_matching_node_and_match(
605         struct device_node *from,
606         const struct of_device_id *matches,
607         const struct of_device_id **match)
608 {
609         return NULL;
610 }
611 
612 static inline struct device_node *of_find_node_by_path(const char *path)
613 {
614         return NULL;
615 }
616 
617 static inline struct device_node *of_find_node_opts_by_path(const char *path,
618         const char **opts)
619 {
620         return NULL;
621 }
622 
623 static inline struct device_node *of_find_node_by_phandle(phandle handle)
624 {
625         return NULL;
626 }
627 
628 static inline struct device_node *of_get_parent(const struct device_node *node)
629 {
630         return NULL;
631 }
632 
633 static inline struct device_node *of_get_next_child(
634         const struct device_node *node, struct device_node *prev)
635 {
636         return NULL;
637 }
638 
639 static inline struct device_node *of_get_next_available_child(
640         const struct device_node *node, struct device_node *prev)
641 {
642         return NULL;
643 }
644 
645 static inline struct device_node *of_find_node_with_property(
646         struct device_node *from, const char *prop_name)
647 {
648         return NULL;
649 }
650 
651 #define of_fwnode_handle(node) NULL
652 
653 static inline bool of_have_populated_dt(void)
654 {
655         return false;
656 }
657 
658 static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
659                                         const char *compatible)
660 {
661         return NULL;
662 }
663 
664 static inline struct device_node *of_get_child_by_name(
665                                         const struct device_node *node,
666                                         const char *name)
667 {
668         return NULL;
669 }
670 
671 static inline int of_device_is_compatible(const struct device_node *device,
672                                           const char *name)
673 {
674         return 0;
675 }
676 
677 static inline  int of_device_compatible_match(struct device_node *device,
678                                               const char *const *compat)
679 {
680         return 0;
681 }
682 
683 static inline bool of_device_is_available(const struct device_node *device)
684 {
685         return false;
686 }
687 
688 static inline bool of_device_is_big_endian(const struct device_node *device)
689 {
690         return false;
691 }
692 
693 static inline struct property *of_find_property(const struct device_node *np,
694                                                 const char *name,
695                                                 int *lenp)
696 {
697         return NULL;
698 }
699 
700 static inline struct device_node *of_find_compatible_node(
701                                                 struct device_node *from,
702                                                 const char *type,
703                                                 const char *compat)
704 {
705         return NULL;
706 }
707 
708 static inline int of_property_count_elems_of_size(const struct device_node *np,
709                         const char *propname, int elem_size)
710 {
711         return -ENOSYS;
712 }
713 
714 static inline int of_property_read_u8_array(const struct device_node *np,
715                         const char *propname, u8 *out_values, size_t sz)
716 {
717         return -ENOSYS;
718 }
719 
720 static inline int of_property_read_u16_array(const struct device_node *np,
721                         const char *propname, u16 *out_values, size_t sz)
722 {
723         return -ENOSYS;
724 }
725 
726 static inline int of_property_read_u32_array(const struct device_node *np,
727                                              const char *propname,
728                                              u32 *out_values, size_t sz)
729 {
730         return -ENOSYS;
731 }
732 
733 static inline int of_property_read_u64_array(const struct device_node *np,
734                                              const char *propname,
735                                              u64 *out_values, size_t sz)
736 {
737         return -ENOSYS;
738 }
739 
740 static inline int of_property_read_u32_index(const struct device_node *np,
741                         const char *propname, u32 index, u32 *out_value)
742 {
743         return -ENOSYS;
744 }
745 
746 static inline int of_property_read_u64_index(const struct device_node *np,
747                         const char *propname, u32 index, u64 *out_value)
748 {
749         return -ENOSYS;
750 }
751 
752 static inline const void *of_get_property(const struct device_node *node,
753                                 const char *name,
754                                 int *lenp)
755 {
756         return NULL;
757 }
758 
759 static inline struct device_node *of_get_cpu_node(int cpu,
760                                         unsigned int *thread)
761 {
762         return NULL;
763 }
764 
765 static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
766 {
767         return NULL;
768 }
769 
770 static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
771                                         int index)
772 {
773         return NULL;
774 }
775 
776 static inline int of_n_addr_cells(struct device_node *np)
777 {
778         return 0;
779 
780 }
781 static inline int of_n_size_cells(struct device_node *np)
782 {
783         return 0;
784 }
785 
786 static inline int of_property_read_variable_u8_array(const struct device_node *np,
787                                         const char *propname, u8 *out_values,
788                                         size_t sz_min, size_t sz_max)
789 {
790         return -ENOSYS;
791 }
792 
793 static inline int of_property_read_variable_u16_array(const struct device_node *np,
794                                         const char *propname, u16 *out_values,
795                                         size_t sz_min, size_t sz_max)
796 {
797         return -ENOSYS;
798 }
799 
800 static inline int of_property_read_variable_u32_array(const struct device_node *np,
801                                         const char *propname,
802                                         u32 *out_values,
803                                         size_t sz_min,
804                                         size_t sz_max)
805 {
806         return -ENOSYS;
807 }
808 
809 static inline int of_property_read_u64(const struct device_node *np,
810                                        const char *propname, u64 *out_value)
811 {
812         return -ENOSYS;
813 }
814 
815 static inline int of_property_read_variable_u64_array(const struct device_node *np,
816                                         const char *propname,
817                                         u64 *out_values,
818                                         size_t sz_min,
819                                         size_t sz_max)
820 {
821         return -ENOSYS;
822 }
823 
824 static inline int of_property_read_string(const struct device_node *np,
825                                           const char *propname,
826                                           const char **out_string)
827 {
828         return -ENOSYS;
829 }
830 
831 static inline int of_property_match_string(const struct device_node *np,
832                                            const char *propname,
833                                            const char *string)
834 {
835         return -ENOSYS;
836 }
837 
838 static inline int of_property_read_string_helper(const struct device_node *np,
839                                                  const char *propname,
840                                                  const char **out_strs, size_t sz, int index)
841 {
842         return -ENOSYS;
843 }
844 
845 static inline struct device_node *of_parse_phandle(const struct device_node *np,
846                                                    const char *phandle_name,
847                                                    int index)
848 {
849         return NULL;
850 }
851 
852 static inline int of_parse_phandle_with_args(const struct device_node *np,
853                                              const char *list_name,
854                                              const char *cells_name,
855                                              int index,
856                                              struct of_phandle_args *out_args)
857 {
858         return -ENOSYS;
859 }
860 
861 static inline int of_parse_phandle_with_args_map(const struct device_node *np,
862                                                  const char *list_name,
863                                                  const char *stem_name,
864                                                  int index,
865                                                  struct of_phandle_args *out_args)
866 {
867         return -ENOSYS;
868 }
869 
870 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
871         const char *list_name, int cells_count, int index,
872         struct of_phandle_args *out_args)
873 {
874         return -ENOSYS;
875 }
876 
877 static inline int of_count_phandle_with_args(struct device_node *np,
878                                              const char *list_name,
879                                              const char *cells_name)
880 {
881         return -ENOSYS;
882 }
883 
884 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
885                                            const struct device_node *np,
886                                            const char *list_name,
887                                            const char *cells_name,
888                                            int cell_count)
889 {
890         return -ENOSYS;
891 }
892 
893 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
894 {
895         return -ENOSYS;
896 }
897 
898 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
899                                            uint32_t *args,
900                                            int size)
901 {
902         return 0;
903 }
904 
905 static inline int of_alias_get_id(struct device_node *np, const char *stem)
906 {
907         return -ENOSYS;
908 }
909 
910 static inline int of_alias_get_highest_id(const char *stem)
911 {
912         return -ENOSYS;
913 }
914 
915 static inline int of_alias_get_alias_list(const struct of_device_id *matches,
916                                           const char *stem, unsigned long *bitmap,
917                                           unsigned int nbits)
918 {
919         return -ENOSYS;
920 }
921 
922 static inline int of_machine_is_compatible(const char *compat)
923 {
924         return 0;
925 }
926 
927 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
928 {
929         return false;
930 }
931 
932 static inline const __be32 *of_prop_next_u32(struct property *prop,
933                 const __be32 *cur, u32 *pu)
934 {
935         return NULL;
936 }
937 
938 static inline const char *of_prop_next_string(struct property *prop,
939                 const char *cur)
940 {
941         return NULL;
942 }
943 
944 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
945 {
946         return 0;
947 }
948 
949 static inline int of_node_test_and_set_flag(struct device_node *n,
950                                             unsigned long flag)
951 {
952         return 0;
953 }
954 
955 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
956 {
957 }
958 
959 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
960 {
961 }
962 
963 static inline int of_property_check_flag(struct property *p, unsigned long flag)
964 {
965         return 0;
966 }
967 
968 static inline void of_property_set_flag(struct property *p, unsigned long flag)
969 {
970 }
971 
972 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
973 {
974 }
975 
976 static inline int of_cpu_node_to_id(struct device_node *np)
977 {
978         return -ENODEV;
979 }
980 
981 static inline int of_map_rid(struct device_node *np, u32 rid,
982                              const char *map_name, const char *map_mask_name,
983                              struct device_node **target, u32 *id_out)
984 {
985         return -EINVAL;
986 }
987 
988 #define of_match_ptr(_ptr)      NULL
989 #define of_match_node(_matches, _node)  NULL
990 #endif /* CONFIG_OF */
991 
992 /* Default string compare functions, Allow arch asm/prom.h to override */
993 #if !defined(of_compat_cmp)
994 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
995 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
996 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
997 #endif
998 
999 static inline int of_prop_val_eq(struct property *p1, struct property *p2)
1000 {
1001         return p1->length == p2->length &&
1002                !memcmp(p1->value, p2->value, (size_t)p1->length);
1003 }
1004 
1005 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
1006 extern int of_node_to_nid(struct device_node *np);
1007 #else
1008 static inline int of_node_to_nid(struct device_node *device)
1009 {
1010         return NUMA_NO_NODE;
1011 }
1012 #endif
1013 
1014 #ifdef CONFIG_OF_NUMA
1015 extern int of_numa_init(void);
1016 #else
1017 static inline int of_numa_init(void)
1018 {
1019         return -ENOSYS;
1020 }
1021 #endif
1022 
1023 static inline struct device_node *of_find_matching_node(
1024         struct device_node *from,
1025         const struct of_device_id *matches)
1026 {
1027         return of_find_matching_node_and_match(from, matches, NULL);
1028 }
1029 
1030 static inline const char *of_node_get_device_type(const struct device_node *np)
1031 {
1032         return of_get_property(np, "device_type", NULL);
1033 }
1034 
1035 static inline bool of_node_is_type(const struct device_node *np, const char *type)
1036 {
1037         const char *match = of_node_get_device_type(np);
1038 
1039         return np && match && type && !strcmp(match, type);
1040 }
1041 
1042 /**
1043  * of_property_count_u8_elems - Count the number of u8 elements in a property
1044  *
1045  * @np:         device node from which the property value is to be read.
1046  * @propname:   name of the property to be searched.
1047  *
1048  * Search for a property in a device node and count the number of u8 elements
1049  * in it. Returns number of elements on sucess, -EINVAL if the property does
1050  * not exist or its length does not match a multiple of u8 and -ENODATA if the
1051  * property does not have a value.
1052  */
1053 static inline int of_property_count_u8_elems(const struct device_node *np,
1054                                 const char *propname)
1055 {
1056         return of_property_count_elems_of_size(np, propname, sizeof(u8));
1057 }
1058 
1059 /**
1060  * of_property_count_u16_elems - Count the number of u16 elements in a property
1061  *
1062  * @np:         device node from which the property value is to be read.
1063  * @propname:   name of the property to be searched.
1064  *
1065  * Search for a property in a device node and count the number of u16 elements
1066  * in it. Returns number of elements on sucess, -EINVAL if the property does
1067  * not exist or its length does not match a multiple of u16 and -ENODATA if the
1068  * property does not have a value.
1069  */
1070 static inline int of_property_count_u16_elems(const struct device_node *np,
1071                                 const char *propname)
1072 {
1073         return of_property_count_elems_of_size(np, propname, sizeof(u16));
1074 }
1075 
1076 /**
1077  * of_property_count_u32_elems - Count the number of u32 elements in a property
1078  *
1079  * @np:         device node from which the property value is to be read.
1080  * @propname:   name of the property to be searched.
1081  *
1082  * Search for a property in a device node and count the number of u32 elements
1083  * in it. Returns number of elements on sucess, -EINVAL if the property does
1084  * not exist or its length does not match a multiple of u32 and -ENODATA if the
1085  * property does not have a value.
1086  */
1087 static inline int of_property_count_u32_elems(const struct device_node *np,
1088                                 const char *propname)
1089 {
1090         return of_property_count_elems_of_size(np, propname, sizeof(u32));
1091 }
1092 
1093 /**
1094  * of_property_count_u64_elems - Count the number of u64 elements in a property
1095  *
1096  * @np:         device node from which the property value is to be read.
1097  * @propname:   name of the property to be searched.
1098  *
1099  * Search for a property in a device node and count the number of u64 elements
1100  * in it. Returns number of elements on sucess, -EINVAL if the property does
1101  * not exist or its length does not match a multiple of u64 and -ENODATA if the
1102  * property does not have a value.
1103  */
1104 static inline int of_property_count_u64_elems(const struct device_node *np,
1105                                 const char *propname)
1106 {
1107         return of_property_count_elems_of_size(np, propname, sizeof(u64));
1108 }
1109 
1110 /**
1111  * of_property_read_string_array() - Read an array of strings from a multiple
1112  * strings property.
1113  * @np:         device node from which the property value is to be read.
1114  * @propname:   name of the property to be searched.
1115  * @out_strs:   output array of string pointers.
1116  * @sz:         number of array elements to read.
1117  *
1118  * Search for a property in a device tree node and retrieve a list of
1119  * terminated string values (pointer to data, not a copy) in that property.
1120  *
1121  * If @out_strs is NULL, the number of strings in the property is returned.
1122  */
1123 static inline int of_property_read_string_array(const struct device_node *np,
1124                                                 const char *propname, const char **out_strs,
1125                                                 size_t sz)
1126 {
1127         return of_property_read_string_helper(np, propname, out_strs, sz, 0);
1128 }
1129 
1130 /**
1131  * of_property_count_strings() - Find and return the number of strings from a
1132  * multiple strings property.
1133  * @np:         device node from which the property value is to be read.
1134  * @propname:   name of the property to be searched.
1135  *
1136  * Search for a property in a device tree node and retrieve the number of null
1137  * terminated string contain in it. Returns the number of strings on
1138  * success, -EINVAL if the property does not exist, -ENODATA if property
1139  * does not have a value, and -EILSEQ if the string is not null-terminated
1140  * within the length of the property data.
1141  */
1142 static inline int of_property_count_strings(const struct device_node *np,
1143                                             const char *propname)
1144 {
1145         return of_property_read_string_helper(np, propname, NULL, 0, 0);
1146 }
1147 
1148 /**
1149  * of_property_read_string_index() - Find and read a string from a multiple
1150  * strings property.
1151  * @np:         device node from which the property value is to be read.
1152  * @propname:   name of the property to be searched.
1153  * @index:      index of the string in the list of strings
1154  * @out_string: pointer to null terminated return string, modified only if
1155  *              return value is 0.
1156  *
1157  * Search for a property in a device tree node and retrieve a null
1158  * terminated string value (pointer to data, not a copy) in the list of strings
1159  * contained in that property.
1160  * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1161  * property does not have a value, and -EILSEQ if the string is not
1162  * null-terminated within the length of the property data.
1163  *
1164  * The out_string pointer is modified only if a valid string can be decoded.
1165  */
1166 static inline int of_property_read_string_index(const struct device_node *np,
1167                                                 const char *propname,
1168                                                 int index, const char **output)
1169 {
1170         int rc = of_property_read_string_helper(np, propname, output, 1, index);
1171         return rc < 0 ? rc : 0;
1172 }
1173 
1174 /**
1175  * of_property_read_bool - Find a property
1176  * @np:         device node from which the property value is to be read.
1177  * @propname:   name of the property to be searched.
1178  *
1179  * Search for a property in a device node.
1180  * Returns true if the property exists false otherwise.
1181  */
1182 static inline bool of_property_read_bool(const struct device_node *np,
1183                                          const char *propname)
1184 {
1185         struct property *prop = of_find_property(np, propname, NULL);
1186 
1187         return prop ? true : false;
1188 }
1189 
1190 static inline int of_property_read_u8(const struct device_node *np,
1191                                        const char *propname,
1192                                        u8 *out_value)
1193 {
1194         return of_property_read_u8_array(np, propname, out_value, 1);
1195 }
1196 
1197 static inline int of_property_read_u16(const struct device_node *np,
1198                                        const char *propname,
1199                                        u16 *out_value)
1200 {
1201         return of_property_read_u16_array(np, propname, out_value, 1);
1202 }
1203 
1204 static inline int of_property_read_u32(const struct device_node *np,
1205                                        const char *propname,
1206                                        u32 *out_value)
1207 {
1208         return of_property_read_u32_array(np, propname, out_value, 1);
1209 }
1210 
1211 static inline int of_property_read_s32(const struct device_node *np,
1212                                        const char *propname,
1213                                        s32 *out_value)
1214 {
1215         return of_property_read_u32(np, propname, (u32*) out_value);
1216 }
1217 
1218 #define of_for_each_phandle(it, err, np, ln, cn, cc)                    \
1219         for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)),    \
1220              err = of_phandle_iterator_next(it);                        \
1221              err == 0;                                                  \
1222              err = of_phandle_iterator_next(it))
1223 
1224 #define of_property_for_each_u32(np, propname, prop, p, u)      \
1225         for (prop = of_find_property(np, propname, NULL),       \
1226                 p = of_prop_next_u32(prop, NULL, &u);           \
1227                 p;                                              \
1228                 p = of_prop_next_u32(prop, p, &u))
1229 
1230 #define of_property_for_each_string(np, propname, prop, s)      \
1231         for (prop = of_find_property(np, propname, NULL),       \
1232                 s = of_prop_next_string(prop, NULL);            \
1233                 s;                                              \
1234                 s = of_prop_next_string(prop, s))
1235 
1236 #define for_each_node_by_name(dn, name) \
1237         for (dn = of_find_node_by_name(NULL, name); dn; \
1238              dn = of_find_node_by_name(dn, name))
1239 #define for_each_node_by_type(dn, type) \
1240         for (dn = of_find_node_by_type(NULL, type); dn; \
1241              dn = of_find_node_by_type(dn, type))
1242 #define for_each_compatible_node(dn, type, compatible) \
1243         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1244              dn = of_find_compatible_node(dn, type, compatible))
1245 #define for_each_matching_node(dn, matches) \
1246         for (dn = of_find_matching_node(NULL, matches); dn; \
1247              dn = of_find_matching_node(dn, matches))
1248 #define for_each_matching_node_and_match(dn, matches, match) \
1249         for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1250              dn; dn = of_find_matching_node_and_match(dn, matches, match))
1251 
1252 #define for_each_child_of_node(parent, child) \
1253         for (child = of_get_next_child(parent, NULL); child != NULL; \
1254              child = of_get_next_child(parent, child))
1255 #define for_each_available_child_of_node(parent, child) \
1256         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1257              child = of_get_next_available_child(parent, child))
1258 
1259 #define for_each_of_cpu_node(cpu) \
1260         for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
1261              cpu = of_get_next_cpu_node(cpu))
1262 
1263 #define for_each_node_with_property(dn, prop_name) \
1264         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1265              dn = of_find_node_with_property(dn, prop_name))
1266 
1267 static inline int of_get_child_count(const struct device_node *np)
1268 {
1269         struct device_node *child;
1270         int num = 0;
1271 
1272         for_each_child_of_node(np, child)
1273                 num++;
1274 
1275         return num;
1276 }
1277 
1278 static inline int of_get_available_child_count(const struct device_node *np)
1279 {
1280         struct device_node *child;
1281         int num = 0;
1282 
1283         for_each_available_child_of_node(np, child)
1284                 num++;
1285 
1286         return num;
1287 }
1288 
1289 #if defined(CONFIG_OF) && !defined(MODULE)
1290 #define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
1291         static const struct of_device_id __of_table_##name              \
1292                 __used __section(__##table##_of_table)                  \
1293                  = { .compatible = compat,                              \
1294                      .data = (fn == (fn_type)NULL) ? fn : fn  }
1295 #else
1296 #define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
1297         static const struct of_device_id __of_table_##name              \
1298                 __attribute__((unused))                                 \
1299                  = { .compatible = compat,                              \
1300                      .data = (fn == (fn_type)NULL) ? fn : fn }
1301 #endif
1302 
1303 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1304 typedef int (*of_init_fn_1_ret)(struct device_node *);
1305 typedef void (*of_init_fn_1)(struct device_node *);
1306 
1307 #define OF_DECLARE_1(table, name, compat, fn) \
1308                 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1309 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1310                 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1311 #define OF_DECLARE_2(table, name, compat, fn) \
1312                 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1313 
1314 /**
1315  * struct of_changeset_entry    - Holds a changeset entry
1316  *
1317  * @node:       list_head for the log list
1318  * @action:     notifier action
1319  * @np:         pointer to the device node affected
1320  * @prop:       pointer to the property affected
1321  * @old_prop:   hold a pointer to the original property
1322  *
1323  * Every modification of the device tree during a changeset
1324  * is held in a list of of_changeset_entry structures.
1325  * That way we can recover from a partial application, or we can
1326  * revert the changeset
1327  */
1328 struct of_changeset_entry {
1329         struct list_head node;
1330         unsigned long action;
1331         struct device_node *np;
1332         struct property *prop;
1333         struct property *old_prop;
1334 };
1335 
1336 /**
1337  * struct of_changeset - changeset tracker structure
1338  *
1339  * @entries:    list_head for the changeset entries
1340  *
1341  * changesets are a convenient way to apply bulk changes to the
1342  * live tree. In case of an error, changes are rolled-back.
1343  * changesets live on after initial application, and if not
1344  * destroyed after use, they can be reverted in one single call.
1345  */
1346 struct of_changeset {
1347         struct list_head entries;
1348 };
1349 
1350 enum of_reconfig_change {
1351         OF_RECONFIG_NO_CHANGE = 0,
1352         OF_RECONFIG_CHANGE_ADD,
1353         OF_RECONFIG_CHANGE_REMOVE,
1354 };
1355 
1356 #ifdef CONFIG_OF_DYNAMIC
1357 extern int of_reconfig_notifier_register(struct notifier_block *);
1358 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1359 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1360 extern int of_reconfig_get_state_change(unsigned long action,
1361                                         struct of_reconfig_data *arg);
1362 
1363 extern void of_changeset_init(struct of_changeset *ocs);
1364 extern void of_changeset_destroy(struct of_changeset *ocs);
1365 extern int of_changeset_apply(struct of_changeset *ocs);
1366 extern int of_changeset_revert(struct of_changeset *ocs);
1367 extern int of_changeset_action(struct of_changeset *ocs,
1368                 unsigned long action, struct device_node *np,
1369                 struct property *prop);
1370 
1371 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1372                 struct device_node *np)
1373 {
1374         return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1375 }
1376 
1377 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1378                 struct device_node *np)
1379 {
1380         return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1381 }
1382 
1383 static inline int of_changeset_add_property(struct of_changeset *ocs,
1384                 struct device_node *np, struct property *prop)
1385 {
1386         return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1387 }
1388 
1389 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1390                 struct device_node *np, struct property *prop)
1391 {
1392         return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1393 }
1394 
1395 static inline int of_changeset_update_property(struct of_changeset *ocs,
1396                 struct device_node *np, struct property *prop)
1397 {
1398         return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1399 }
1400 #else /* CONFIG_OF_DYNAMIC */
1401 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1402 {
1403         return -EINVAL;
1404 }
1405 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1406 {
1407         return -EINVAL;
1408 }
1409 static inline int of_reconfig_notify(unsigned long action,
1410                                      struct of_reconfig_data *arg)
1411 {
1412         return -EINVAL;
1413 }
1414 static inline int of_reconfig_get_state_change(unsigned long action,
1415                                                 struct of_reconfig_data *arg)
1416 {
1417         return -EINVAL;
1418 }
1419 #endif /* CONFIG_OF_DYNAMIC */
1420 
1421 /**
1422  * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1423  * @np: Pointer to the given device_node
1424  *
1425  * return true if present false otherwise
1426  */
1427 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1428 {
1429         return of_property_read_bool(np, "system-power-controller");
1430 }
1431 
1432 /**
1433  * Overlay support
1434  */
1435 
1436 enum of_overlay_notify_action {
1437         OF_OVERLAY_PRE_APPLY = 0,
1438         OF_OVERLAY_POST_APPLY,
1439         OF_OVERLAY_PRE_REMOVE,
1440         OF_OVERLAY_POST_REMOVE,
1441 };
1442 
1443 struct of_overlay_notify_data {
1444         struct device_node *overlay;
1445         struct device_node *target;
1446 };
1447 
1448 #ifdef CONFIG_OF_OVERLAY
1449 
1450 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
1451                          int *ovcs_id);
1452 int of_overlay_remove(int *ovcs_id);
1453 int of_overlay_remove_all(void);
1454 
1455 int of_overlay_notifier_register(struct notifier_block *nb);
1456 int of_overlay_notifier_unregister(struct notifier_block *nb);
1457 
1458 #else
1459 
1460 static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size,
1461                                        int *ovcs_id)
1462 {
1463         return -ENOTSUPP;
1464 }
1465 
1466 static inline int of_overlay_remove(int *ovcs_id)
1467 {
1468         return -ENOTSUPP;
1469 }
1470 
1471 static inline int of_overlay_remove_all(void)
1472 {
1473         return -ENOTSUPP;
1474 }
1475 
1476 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1477 {
1478         return 0;
1479 }
1480 
1481 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1482 {
1483         return 0;
1484 }
1485 
1486 #endif
1487 
1488 #endif /* _LINUX_OF_H */
1489 

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