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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 
355 #define for_each_property_of_node(dn, pp) \
356         for (pp = dn->properties; pp != NULL; pp = pp->next)
357 
358 extern int of_n_addr_cells(struct device_node *np);
359 extern int of_n_size_cells(struct device_node *np);
360 extern const struct of_device_id *of_match_node(
361         const struct of_device_id *matches, const struct device_node *node);
362 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
363 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
364 extern struct device_node *of_parse_phandle(const struct device_node *np,
365                                             const char *phandle_name,
366                                             int index);
367 extern int of_parse_phandle_with_args(const struct device_node *np,
368         const char *list_name, const char *cells_name, int index,
369         struct of_phandle_args *out_args);
370 extern int of_parse_phandle_with_args_map(const struct device_node *np,
371         const char *list_name, const char *stem_name, int index,
372         struct of_phandle_args *out_args);
373 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
374         const char *list_name, int cells_count, int index,
375         struct of_phandle_args *out_args);
376 extern int of_count_phandle_with_args(const struct device_node *np,
377         const char *list_name, const char *cells_name);
378 
379 /* phandle iterator functions */
380 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
381                                     const struct device_node *np,
382                                     const char *list_name,
383                                     const char *cells_name,
384                                     int cell_count);
385 
386 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
387 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
388                                     uint32_t *args,
389                                     int size);
390 
391 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
392 extern int of_alias_get_id(struct device_node *np, const char *stem);
393 extern int of_alias_get_highest_id(const char *stem);
394 extern int of_alias_get_alias_list(const struct of_device_id *matches,
395                                    const char *stem, unsigned long *bitmap,
396                                    unsigned int nbits);
397 
398 extern int of_machine_is_compatible(const char *compat);
399 
400 extern int of_add_property(struct device_node *np, struct property *prop);
401 extern int of_remove_property(struct device_node *np, struct property *prop);
402 extern int of_update_property(struct device_node *np, struct property *newprop);
403 
404 /* For updating the device tree at runtime */
405 #define OF_RECONFIG_ATTACH_NODE         0x0001
406 #define OF_RECONFIG_DETACH_NODE         0x0002
407 #define OF_RECONFIG_ADD_PROPERTY        0x0003
408 #define OF_RECONFIG_REMOVE_PROPERTY     0x0004
409 #define OF_RECONFIG_UPDATE_PROPERTY     0x0005
410 
411 extern int of_attach_node(struct device_node *);
412 extern int of_detach_node(struct device_node *);
413 
414 #define of_match_ptr(_ptr)      (_ptr)
415 
416 /**
417  * of_property_read_u8_array - Find and read an array of u8 from a property.
418  *
419  * @np:         device node from which the property value is to be read.
420  * @propname:   name of the property to be searched.
421  * @out_values: pointer to return value, modified only if return value is 0.
422  * @sz:         number of array elements to read
423  *
424  * Search for a property in a device node and read 8-bit value(s) from
425  * it. Returns 0 on success, -EINVAL if the property does not exist,
426  * -ENODATA if property does not have a value, and -EOVERFLOW if the
427  * property data isn't large enough.
428  *
429  * dts entry of array should be like:
430  *      property = /bits/ 8 <0x50 0x60 0x70>;
431  *
432  * The out_values is modified only if a valid u8 value can be decoded.
433  */
434 static inline int of_property_read_u8_array(const struct device_node *np,
435                                             const char *propname,
436                                             u8 *out_values, size_t sz)
437 {
438         int ret = of_property_read_variable_u8_array(np, propname, out_values,
439                                                      sz, 0);
440         if (ret >= 0)
441                 return 0;
442         else
443                 return ret;
444 }
445 
446 /**
447  * of_property_read_u16_array - Find and read an array of u16 from a property.
448  *
449  * @np:         device node from which the property value is to be read.
450  * @propname:   name of the property to be searched.
451  * @out_values: pointer to return value, modified only if return value is 0.
452  * @sz:         number of array elements to read
453  *
454  * Search for a property in a device node and read 16-bit value(s) from
455  * it. Returns 0 on success, -EINVAL if the property does not exist,
456  * -ENODATA if property does not have a value, and -EOVERFLOW if the
457  * property data isn't large enough.
458  *
459  * dts entry of array should be like:
460  *      property = /bits/ 16 <0x5000 0x6000 0x7000>;
461  *
462  * The out_values is modified only if a valid u16 value can be decoded.
463  */
464 static inline int of_property_read_u16_array(const struct device_node *np,
465                                              const char *propname,
466                                              u16 *out_values, size_t sz)
467 {
468         int ret = of_property_read_variable_u16_array(np, propname, out_values,
469                                                       sz, 0);
470         if (ret >= 0)
471                 return 0;
472         else
473                 return ret;
474 }
475 
476 /**
477  * of_property_read_u32_array - Find and read an array of 32 bit integers
478  * from a property.
479  *
480  * @np:         device node from which the property value is to be read.
481  * @propname:   name of the property to be searched.
482  * @out_values: pointer to return value, modified only if return value is 0.
483  * @sz:         number of array elements to read
484  *
485  * Search for a property in a device node and read 32-bit value(s) from
486  * it. Returns 0 on success, -EINVAL if the property does not exist,
487  * -ENODATA if property does not have a value, and -EOVERFLOW if the
488  * property data isn't large enough.
489  *
490  * The out_values is modified only if a valid u32 value can be decoded.
491  */
492 static inline int of_property_read_u32_array(const struct device_node *np,
493                                              const char *propname,
494                                              u32 *out_values, size_t sz)
495 {
496         int ret = of_property_read_variable_u32_array(np, propname, out_values,
497                                                       sz, 0);
498         if (ret >= 0)
499                 return 0;
500         else
501                 return ret;
502 }
503 
504 /**
505  * of_property_read_u64_array - Find and read an array of 64 bit integers
506  * from a property.
507  *
508  * @np:         device node from which the property value is to be read.
509  * @propname:   name of the property to be searched.
510  * @out_values: pointer to return value, modified only if return value is 0.
511  * @sz:         number of array elements to read
512  *
513  * Search for a property in a device node and read 64-bit value(s) from
514  * it. Returns 0 on success, -EINVAL if the property does not exist,
515  * -ENODATA if property does not have a value, and -EOVERFLOW if the
516  * property data isn't large enough.
517  *
518  * The out_values is modified only if a valid u64 value can be decoded.
519  */
520 static inline int of_property_read_u64_array(const struct device_node *np,
521                                              const char *propname,
522                                              u64 *out_values, size_t sz)
523 {
524         int ret = of_property_read_variable_u64_array(np, propname, out_values,
525                                                       sz, 0);
526         if (ret >= 0)
527                 return 0;
528         else
529                 return ret;
530 }
531 
532 /*
533  * struct property *prop;
534  * const __be32 *p;
535  * u32 u;
536  *
537  * of_property_for_each_u32(np, "propname", prop, p, u)
538  *         printk("U32 value: %x\n", u);
539  */
540 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
541                                u32 *pu);
542 /*
543  * struct property *prop;
544  * const char *s;
545  *
546  * of_property_for_each_string(np, "propname", prop, s)
547  *         printk("String value: %s\n", s);
548  */
549 const char *of_prop_next_string(struct property *prop, const char *cur);
550 
551 bool of_console_check(struct device_node *dn, char *name, int index);
552 
553 extern int of_cpu_node_to_id(struct device_node *np);
554 
555 int of_map_rid(struct device_node *np, u32 rid,
556                const char *map_name, const char *map_mask_name,
557                struct device_node **target, u32 *id_out);
558 
559 #else /* CONFIG_OF */
560 
561 static inline void of_core_init(void)
562 {
563 }
564 
565 static inline bool is_of_node(const struct fwnode_handle *fwnode)
566 {
567         return false;
568 }
569 
570 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
571 {
572         return NULL;
573 }
574 
575 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
576 {
577         return false;
578 }
579 
580 static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
581 {
582         return false;
583 }
584 
585 static inline const char* of_node_full_name(const struct device_node *np)
586 {
587         return "<no-node>";
588 }
589 
590 static inline struct device_node *of_find_node_by_name(struct device_node *from,
591         const char *name)
592 {
593         return NULL;
594 }
595 
596 static inline struct device_node *of_find_node_by_type(struct device_node *from,
597         const char *type)
598 {
599         return NULL;
600 }
601 
602 static inline struct device_node *of_find_matching_node_and_match(
603         struct device_node *from,
604         const struct of_device_id *matches,
605         const struct of_device_id **match)
606 {
607         return NULL;
608 }
609 
610 static inline struct device_node *of_find_node_by_path(const char *path)
611 {
612         return NULL;
613 }
614 
615 static inline struct device_node *of_find_node_opts_by_path(const char *path,
616         const char **opts)
617 {
618         return NULL;
619 }
620 
621 static inline struct device_node *of_find_node_by_phandle(phandle handle)
622 {
623         return NULL;
624 }
625 
626 static inline struct device_node *of_get_parent(const struct device_node *node)
627 {
628         return NULL;
629 }
630 
631 static inline struct device_node *of_get_next_child(
632         const struct device_node *node, struct device_node *prev)
633 {
634         return NULL;
635 }
636 
637 static inline struct device_node *of_get_next_available_child(
638         const struct device_node *node, struct device_node *prev)
639 {
640         return NULL;
641 }
642 
643 static inline struct device_node *of_find_node_with_property(
644         struct device_node *from, const char *prop_name)
645 {
646         return NULL;
647 }
648 
649 #define of_fwnode_handle(node) NULL
650 
651 static inline bool of_have_populated_dt(void)
652 {
653         return false;
654 }
655 
656 static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
657                                         const char *compatible)
658 {
659         return NULL;
660 }
661 
662 static inline struct device_node *of_get_child_by_name(
663                                         const struct device_node *node,
664                                         const char *name)
665 {
666         return NULL;
667 }
668 
669 static inline int of_device_is_compatible(const struct device_node *device,
670                                           const char *name)
671 {
672         return 0;
673 }
674 
675 static inline  int of_device_compatible_match(struct device_node *device,
676                                               const char *const *compat)
677 {
678         return 0;
679 }
680 
681 static inline bool of_device_is_available(const struct device_node *device)
682 {
683         return false;
684 }
685 
686 static inline bool of_device_is_big_endian(const struct device_node *device)
687 {
688         return false;
689 }
690 
691 static inline struct property *of_find_property(const struct device_node *np,
692                                                 const char *name,
693                                                 int *lenp)
694 {
695         return NULL;
696 }
697 
698 static inline struct device_node *of_find_compatible_node(
699                                                 struct device_node *from,
700                                                 const char *type,
701                                                 const char *compat)
702 {
703         return NULL;
704 }
705 
706 static inline int of_property_count_elems_of_size(const struct device_node *np,
707                         const char *propname, int elem_size)
708 {
709         return -ENOSYS;
710 }
711 
712 static inline int of_property_read_u8_array(const struct device_node *np,
713                         const char *propname, u8 *out_values, size_t sz)
714 {
715         return -ENOSYS;
716 }
717 
718 static inline int of_property_read_u16_array(const struct device_node *np,
719                         const char *propname, u16 *out_values, size_t sz)
720 {
721         return -ENOSYS;
722 }
723 
724 static inline int of_property_read_u32_array(const struct device_node *np,
725                                              const char *propname,
726                                              u32 *out_values, size_t sz)
727 {
728         return -ENOSYS;
729 }
730 
731 static inline int of_property_read_u64_array(const struct device_node *np,
732                                              const char *propname,
733                                              u64 *out_values, size_t sz)
734 {
735         return -ENOSYS;
736 }
737 
738 static inline int of_property_read_u32_index(const struct device_node *np,
739                         const char *propname, u32 index, u32 *out_value)
740 {
741         return -ENOSYS;
742 }
743 
744 static inline int of_property_read_u64_index(const struct device_node *np,
745                         const char *propname, u32 index, u64 *out_value)
746 {
747         return -ENOSYS;
748 }
749 
750 static inline const void *of_get_property(const struct device_node *node,
751                                 const char *name,
752                                 int *lenp)
753 {
754         return NULL;
755 }
756 
757 static inline struct device_node *of_get_cpu_node(int cpu,
758                                         unsigned int *thread)
759 {
760         return NULL;
761 }
762 
763 static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
764 {
765         return NULL;
766 }
767 
768 static inline int of_n_addr_cells(struct device_node *np)
769 {
770         return 0;
771 
772 }
773 static inline int of_n_size_cells(struct device_node *np)
774 {
775         return 0;
776 }
777 
778 static inline int of_property_read_variable_u8_array(const struct device_node *np,
779                                         const char *propname, u8 *out_values,
780                                         size_t sz_min, size_t sz_max)
781 {
782         return -ENOSYS;
783 }
784 
785 static inline int of_property_read_variable_u16_array(const struct device_node *np,
786                                         const char *propname, u16 *out_values,
787                                         size_t sz_min, size_t sz_max)
788 {
789         return -ENOSYS;
790 }
791 
792 static inline int of_property_read_variable_u32_array(const struct device_node *np,
793                                         const char *propname,
794                                         u32 *out_values,
795                                         size_t sz_min,
796                                         size_t sz_max)
797 {
798         return -ENOSYS;
799 }
800 
801 static inline int of_property_read_u64(const struct device_node *np,
802                                        const char *propname, u64 *out_value)
803 {
804         return -ENOSYS;
805 }
806 
807 static inline int of_property_read_variable_u64_array(const struct device_node *np,
808                                         const char *propname,
809                                         u64 *out_values,
810                                         size_t sz_min,
811                                         size_t sz_max)
812 {
813         return -ENOSYS;
814 }
815 
816 static inline int of_property_read_string(const struct device_node *np,
817                                           const char *propname,
818                                           const char **out_string)
819 {
820         return -ENOSYS;
821 }
822 
823 static inline int of_property_match_string(const struct device_node *np,
824                                            const char *propname,
825                                            const char *string)
826 {
827         return -ENOSYS;
828 }
829 
830 static inline int of_property_read_string_helper(const struct device_node *np,
831                                                  const char *propname,
832                                                  const char **out_strs, size_t sz, int index)
833 {
834         return -ENOSYS;
835 }
836 
837 static inline struct device_node *of_parse_phandle(const struct device_node *np,
838                                                    const char *phandle_name,
839                                                    int index)
840 {
841         return NULL;
842 }
843 
844 static inline int of_parse_phandle_with_args(const struct device_node *np,
845                                              const char *list_name,
846                                              const char *cells_name,
847                                              int index,
848                                              struct of_phandle_args *out_args)
849 {
850         return -ENOSYS;
851 }
852 
853 static inline int of_parse_phandle_with_args_map(const struct device_node *np,
854                                                  const char *list_name,
855                                                  const char *stem_name,
856                                                  int index,
857                                                  struct of_phandle_args *out_args)
858 {
859         return -ENOSYS;
860 }
861 
862 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
863         const char *list_name, int cells_count, int index,
864         struct of_phandle_args *out_args)
865 {
866         return -ENOSYS;
867 }
868 
869 static inline int of_count_phandle_with_args(struct device_node *np,
870                                              const char *list_name,
871                                              const char *cells_name)
872 {
873         return -ENOSYS;
874 }
875 
876 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
877                                            const struct device_node *np,
878                                            const char *list_name,
879                                            const char *cells_name,
880                                            int cell_count)
881 {
882         return -ENOSYS;
883 }
884 
885 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
886 {
887         return -ENOSYS;
888 }
889 
890 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
891                                            uint32_t *args,
892                                            int size)
893 {
894         return 0;
895 }
896 
897 static inline int of_alias_get_id(struct device_node *np, const char *stem)
898 {
899         return -ENOSYS;
900 }
901 
902 static inline int of_alias_get_highest_id(const char *stem)
903 {
904         return -ENOSYS;
905 }
906 
907 static inline int of_alias_get_alias_list(const struct of_device_id *matches,
908                                           const char *stem, unsigned long *bitmap,
909                                           unsigned int nbits)
910 {
911         return -ENOSYS;
912 }
913 
914 static inline int of_machine_is_compatible(const char *compat)
915 {
916         return 0;
917 }
918 
919 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
920 {
921         return false;
922 }
923 
924 static inline const __be32 *of_prop_next_u32(struct property *prop,
925                 const __be32 *cur, u32 *pu)
926 {
927         return NULL;
928 }
929 
930 static inline const char *of_prop_next_string(struct property *prop,
931                 const char *cur)
932 {
933         return NULL;
934 }
935 
936 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
937 {
938         return 0;
939 }
940 
941 static inline int of_node_test_and_set_flag(struct device_node *n,
942                                             unsigned long flag)
943 {
944         return 0;
945 }
946 
947 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
948 {
949 }
950 
951 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
952 {
953 }
954 
955 static inline int of_property_check_flag(struct property *p, unsigned long flag)
956 {
957         return 0;
958 }
959 
960 static inline void of_property_set_flag(struct property *p, unsigned long flag)
961 {
962 }
963 
964 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
965 {
966 }
967 
968 static inline int of_cpu_node_to_id(struct device_node *np)
969 {
970         return -ENODEV;
971 }
972 
973 static inline int of_map_rid(struct device_node *np, u32 rid,
974                              const char *map_name, const char *map_mask_name,
975                              struct device_node **target, u32 *id_out)
976 {
977         return -EINVAL;
978 }
979 
980 #define of_match_ptr(_ptr)      NULL
981 #define of_match_node(_matches, _node)  NULL
982 #endif /* CONFIG_OF */
983 
984 /* Default string compare functions, Allow arch asm/prom.h to override */
985 #if !defined(of_compat_cmp)
986 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
987 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
988 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
989 #endif
990 
991 static inline int of_prop_val_eq(struct property *p1, struct property *p2)
992 {
993         return p1->length == p2->length &&
994                !memcmp(p1->value, p2->value, (size_t)p1->length);
995 }
996 
997 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
998 extern int of_node_to_nid(struct device_node *np);
999 #else
1000 static inline int of_node_to_nid(struct device_node *device)
1001 {
1002         return NUMA_NO_NODE;
1003 }
1004 #endif
1005 
1006 #ifdef CONFIG_OF_NUMA
1007 extern int of_numa_init(void);
1008 #else
1009 static inline int of_numa_init(void)
1010 {
1011         return -ENOSYS;
1012 }
1013 #endif
1014 
1015 static inline struct device_node *of_find_matching_node(
1016         struct device_node *from,
1017         const struct of_device_id *matches)
1018 {
1019         return of_find_matching_node_and_match(from, matches, NULL);
1020 }
1021 
1022 static inline const char *of_node_get_device_type(const struct device_node *np)
1023 {
1024         return of_get_property(np, "device_type", NULL);
1025 }
1026 
1027 static inline bool of_node_is_type(const struct device_node *np, const char *type)
1028 {
1029         const char *match = of_node_get_device_type(np);
1030 
1031         return np && match && type && !strcmp(match, type);
1032 }
1033 
1034 /**
1035  * of_property_count_u8_elems - Count the number of u8 elements in a property
1036  *
1037  * @np:         device node from which the property value is to be read.
1038  * @propname:   name of the property to be searched.
1039  *
1040  * Search for a property in a device node and count the number of u8 elements
1041  * in it. Returns number of elements on sucess, -EINVAL if the property does
1042  * not exist or its length does not match a multiple of u8 and -ENODATA if the
1043  * property does not have a value.
1044  */
1045 static inline int of_property_count_u8_elems(const struct device_node *np,
1046                                 const char *propname)
1047 {
1048         return of_property_count_elems_of_size(np, propname, sizeof(u8));
1049 }
1050 
1051 /**
1052  * of_property_count_u16_elems - Count the number of u16 elements in a property
1053  *
1054  * @np:         device node from which the property value is to be read.
1055  * @propname:   name of the property to be searched.
1056  *
1057  * Search for a property in a device node and count the number of u16 elements
1058  * in it. Returns number of elements on sucess, -EINVAL if the property does
1059  * not exist or its length does not match a multiple of u16 and -ENODATA if the
1060  * property does not have a value.
1061  */
1062 static inline int of_property_count_u16_elems(const struct device_node *np,
1063                                 const char *propname)
1064 {
1065         return of_property_count_elems_of_size(np, propname, sizeof(u16));
1066 }
1067 
1068 /**
1069  * of_property_count_u32_elems - Count the number of u32 elements in a property
1070  *
1071  * @np:         device node from which the property value is to be read.
1072  * @propname:   name of the property to be searched.
1073  *
1074  * Search for a property in a device node and count the number of u32 elements
1075  * in it. Returns number of elements on sucess, -EINVAL if the property does
1076  * not exist or its length does not match a multiple of u32 and -ENODATA if the
1077  * property does not have a value.
1078  */
1079 static inline int of_property_count_u32_elems(const struct device_node *np,
1080                                 const char *propname)
1081 {
1082         return of_property_count_elems_of_size(np, propname, sizeof(u32));
1083 }
1084 
1085 /**
1086  * of_property_count_u64_elems - Count the number of u64 elements in a property
1087  *
1088  * @np:         device node from which the property value is to be read.
1089  * @propname:   name of the property to be searched.
1090  *
1091  * Search for a property in a device node and count the number of u64 elements
1092  * in it. Returns number of elements on sucess, -EINVAL if the property does
1093  * not exist or its length does not match a multiple of u64 and -ENODATA if the
1094  * property does not have a value.
1095  */
1096 static inline int of_property_count_u64_elems(const struct device_node *np,
1097                                 const char *propname)
1098 {
1099         return of_property_count_elems_of_size(np, propname, sizeof(u64));
1100 }
1101 
1102 /**
1103  * of_property_read_string_array() - Read an array of strings from a multiple
1104  * strings property.
1105  * @np:         device node from which the property value is to be read.
1106  * @propname:   name of the property to be searched.
1107  * @out_strs:   output array of string pointers.
1108  * @sz:         number of array elements to read.
1109  *
1110  * Search for a property in a device tree node and retrieve a list of
1111  * terminated string values (pointer to data, not a copy) in that property.
1112  *
1113  * If @out_strs is NULL, the number of strings in the property is returned.
1114  */
1115 static inline int of_property_read_string_array(const struct device_node *np,
1116                                                 const char *propname, const char **out_strs,
1117                                                 size_t sz)
1118 {
1119         return of_property_read_string_helper(np, propname, out_strs, sz, 0);
1120 }
1121 
1122 /**
1123  * of_property_count_strings() - Find and return the number of strings from a
1124  * multiple strings property.
1125  * @np:         device node from which the property value is to be read.
1126  * @propname:   name of the property to be searched.
1127  *
1128  * Search for a property in a device tree node and retrieve the number of null
1129  * terminated string contain in it. Returns the number of strings on
1130  * success, -EINVAL if the property does not exist, -ENODATA if property
1131  * does not have a value, and -EILSEQ if the string is not null-terminated
1132  * within the length of the property data.
1133  */
1134 static inline int of_property_count_strings(const struct device_node *np,
1135                                             const char *propname)
1136 {
1137         return of_property_read_string_helper(np, propname, NULL, 0, 0);
1138 }
1139 
1140 /**
1141  * of_property_read_string_index() - Find and read a string from a multiple
1142  * strings property.
1143  * @np:         device node from which the property value is to be read.
1144  * @propname:   name of the property to be searched.
1145  * @index:      index of the string in the list of strings
1146  * @out_string: pointer to null terminated return string, modified only if
1147  *              return value is 0.
1148  *
1149  * Search for a property in a device tree node and retrieve a null
1150  * terminated string value (pointer to data, not a copy) in the list of strings
1151  * contained in that property.
1152  * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
1153  * property does not have a value, and -EILSEQ if the string is not
1154  * null-terminated within the length of the property data.
1155  *
1156  * The out_string pointer is modified only if a valid string can be decoded.
1157  */
1158 static inline int of_property_read_string_index(const struct device_node *np,
1159                                                 const char *propname,
1160                                                 int index, const char **output)
1161 {
1162         int rc = of_property_read_string_helper(np, propname, output, 1, index);
1163         return rc < 0 ? rc : 0;
1164 }
1165 
1166 /**
1167  * of_property_read_bool - Find a property
1168  * @np:         device node from which the property value is to be read.
1169  * @propname:   name of the property to be searched.
1170  *
1171  * Search for a property in a device node.
1172  * Returns true if the property exists false otherwise.
1173  */
1174 static inline bool of_property_read_bool(const struct device_node *np,
1175                                          const char *propname)
1176 {
1177         struct property *prop = of_find_property(np, propname, NULL);
1178 
1179         return prop ? true : false;
1180 }
1181 
1182 static inline int of_property_read_u8(const struct device_node *np,
1183                                        const char *propname,
1184                                        u8 *out_value)
1185 {
1186         return of_property_read_u8_array(np, propname, out_value, 1);
1187 }
1188 
1189 static inline int of_property_read_u16(const struct device_node *np,
1190                                        const char *propname,
1191                                        u16 *out_value)
1192 {
1193         return of_property_read_u16_array(np, propname, out_value, 1);
1194 }
1195 
1196 static inline int of_property_read_u32(const struct device_node *np,
1197                                        const char *propname,
1198                                        u32 *out_value)
1199 {
1200         return of_property_read_u32_array(np, propname, out_value, 1);
1201 }
1202 
1203 static inline int of_property_read_s32(const struct device_node *np,
1204                                        const char *propname,
1205                                        s32 *out_value)
1206 {
1207         return of_property_read_u32(np, propname, (u32*) out_value);
1208 }
1209 
1210 #define of_for_each_phandle(it, err, np, ln, cn, cc)                    \
1211         for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)),    \
1212              err = of_phandle_iterator_next(it);                        \
1213              err == 0;                                                  \
1214              err = of_phandle_iterator_next(it))
1215 
1216 #define of_property_for_each_u32(np, propname, prop, p, u)      \
1217         for (prop = of_find_property(np, propname, NULL),       \
1218                 p = of_prop_next_u32(prop, NULL, &u);           \
1219                 p;                                              \
1220                 p = of_prop_next_u32(prop, p, &u))
1221 
1222 #define of_property_for_each_string(np, propname, prop, s)      \
1223         for (prop = of_find_property(np, propname, NULL),       \
1224                 s = of_prop_next_string(prop, NULL);            \
1225                 s;                                              \
1226                 s = of_prop_next_string(prop, s))
1227 
1228 #define for_each_node_by_name(dn, name) \
1229         for (dn = of_find_node_by_name(NULL, name); dn; \
1230              dn = of_find_node_by_name(dn, name))
1231 #define for_each_node_by_type(dn, type) \
1232         for (dn = of_find_node_by_type(NULL, type); dn; \
1233              dn = of_find_node_by_type(dn, type))
1234 #define for_each_compatible_node(dn, type, compatible) \
1235         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
1236              dn = of_find_compatible_node(dn, type, compatible))
1237 #define for_each_matching_node(dn, matches) \
1238         for (dn = of_find_matching_node(NULL, matches); dn; \
1239              dn = of_find_matching_node(dn, matches))
1240 #define for_each_matching_node_and_match(dn, matches, match) \
1241         for (dn = of_find_matching_node_and_match(NULL, matches, match); \
1242              dn; dn = of_find_matching_node_and_match(dn, matches, match))
1243 
1244 #define for_each_child_of_node(parent, child) \
1245         for (child = of_get_next_child(parent, NULL); child != NULL; \
1246              child = of_get_next_child(parent, child))
1247 #define for_each_available_child_of_node(parent, child) \
1248         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
1249              child = of_get_next_available_child(parent, child))
1250 
1251 #define for_each_of_cpu_node(cpu) \
1252         for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
1253              cpu = of_get_next_cpu_node(cpu))
1254 
1255 #define for_each_node_with_property(dn, prop_name) \
1256         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
1257              dn = of_find_node_with_property(dn, prop_name))
1258 
1259 static inline int of_get_child_count(const struct device_node *np)
1260 {
1261         struct device_node *child;
1262         int num = 0;
1263 
1264         for_each_child_of_node(np, child)
1265                 num++;
1266 
1267         return num;
1268 }
1269 
1270 static inline int of_get_available_child_count(const struct device_node *np)
1271 {
1272         struct device_node *child;
1273         int num = 0;
1274 
1275         for_each_available_child_of_node(np, child)
1276                 num++;
1277 
1278         return num;
1279 }
1280 
1281 #if defined(CONFIG_OF) && !defined(MODULE)
1282 #define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
1283         static const struct of_device_id __of_table_##name              \
1284                 __used __section(__##table##_of_table)                  \
1285                  = { .compatible = compat,                              \
1286                      .data = (fn == (fn_type)NULL) ? fn : fn  }
1287 #else
1288 #define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
1289         static const struct of_device_id __of_table_##name              \
1290                 __attribute__((unused))                                 \
1291                  = { .compatible = compat,                              \
1292                      .data = (fn == (fn_type)NULL) ? fn : fn }
1293 #endif
1294 
1295 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
1296 typedef int (*of_init_fn_1_ret)(struct device_node *);
1297 typedef void (*of_init_fn_1)(struct device_node *);
1298 
1299 #define OF_DECLARE_1(table, name, compat, fn) \
1300                 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
1301 #define OF_DECLARE_1_RET(table, name, compat, fn) \
1302                 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
1303 #define OF_DECLARE_2(table, name, compat, fn) \
1304                 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
1305 
1306 /**
1307  * struct of_changeset_entry    - Holds a changeset entry
1308  *
1309  * @node:       list_head for the log list
1310  * @action:     notifier action
1311  * @np:         pointer to the device node affected
1312  * @prop:       pointer to the property affected
1313  * @old_prop:   hold a pointer to the original property
1314  *
1315  * Every modification of the device tree during a changeset
1316  * is held in a list of of_changeset_entry structures.
1317  * That way we can recover from a partial application, or we can
1318  * revert the changeset
1319  */
1320 struct of_changeset_entry {
1321         struct list_head node;
1322         unsigned long action;
1323         struct device_node *np;
1324         struct property *prop;
1325         struct property *old_prop;
1326 };
1327 
1328 /**
1329  * struct of_changeset - changeset tracker structure
1330  *
1331  * @entries:    list_head for the changeset entries
1332  *
1333  * changesets are a convenient way to apply bulk changes to the
1334  * live tree. In case of an error, changes are rolled-back.
1335  * changesets live on after initial application, and if not
1336  * destroyed after use, they can be reverted in one single call.
1337  */
1338 struct of_changeset {
1339         struct list_head entries;
1340 };
1341 
1342 enum of_reconfig_change {
1343         OF_RECONFIG_NO_CHANGE = 0,
1344         OF_RECONFIG_CHANGE_ADD,
1345         OF_RECONFIG_CHANGE_REMOVE,
1346 };
1347 
1348 #ifdef CONFIG_OF_DYNAMIC
1349 extern int of_reconfig_notifier_register(struct notifier_block *);
1350 extern int of_reconfig_notifier_unregister(struct notifier_block *);
1351 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
1352 extern int of_reconfig_get_state_change(unsigned long action,
1353                                         struct of_reconfig_data *arg);
1354 
1355 extern void of_changeset_init(struct of_changeset *ocs);
1356 extern void of_changeset_destroy(struct of_changeset *ocs);
1357 extern int of_changeset_apply(struct of_changeset *ocs);
1358 extern int of_changeset_revert(struct of_changeset *ocs);
1359 extern int of_changeset_action(struct of_changeset *ocs,
1360                 unsigned long action, struct device_node *np,
1361                 struct property *prop);
1362 
1363 static inline int of_changeset_attach_node(struct of_changeset *ocs,
1364                 struct device_node *np)
1365 {
1366         return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
1367 }
1368 
1369 static inline int of_changeset_detach_node(struct of_changeset *ocs,
1370                 struct device_node *np)
1371 {
1372         return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
1373 }
1374 
1375 static inline int of_changeset_add_property(struct of_changeset *ocs,
1376                 struct device_node *np, struct property *prop)
1377 {
1378         return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
1379 }
1380 
1381 static inline int of_changeset_remove_property(struct of_changeset *ocs,
1382                 struct device_node *np, struct property *prop)
1383 {
1384         return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
1385 }
1386 
1387 static inline int of_changeset_update_property(struct of_changeset *ocs,
1388                 struct device_node *np, struct property *prop)
1389 {
1390         return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
1391 }
1392 #else /* CONFIG_OF_DYNAMIC */
1393 static inline int of_reconfig_notifier_register(struct notifier_block *nb)
1394 {
1395         return -EINVAL;
1396 }
1397 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
1398 {
1399         return -EINVAL;
1400 }
1401 static inline int of_reconfig_notify(unsigned long action,
1402                                      struct of_reconfig_data *arg)
1403 {
1404         return -EINVAL;
1405 }
1406 static inline int of_reconfig_get_state_change(unsigned long action,
1407                                                 struct of_reconfig_data *arg)
1408 {
1409         return -EINVAL;
1410 }
1411 #endif /* CONFIG_OF_DYNAMIC */
1412 
1413 /**
1414  * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
1415  * @np: Pointer to the given device_node
1416  *
1417  * return true if present false otherwise
1418  */
1419 static inline bool of_device_is_system_power_controller(const struct device_node *np)
1420 {
1421         return of_property_read_bool(np, "system-power-controller");
1422 }
1423 
1424 /**
1425  * Overlay support
1426  */
1427 
1428 enum of_overlay_notify_action {
1429         OF_OVERLAY_PRE_APPLY = 0,
1430         OF_OVERLAY_POST_APPLY,
1431         OF_OVERLAY_PRE_REMOVE,
1432         OF_OVERLAY_POST_REMOVE,
1433 };
1434 
1435 struct of_overlay_notify_data {
1436         struct device_node *overlay;
1437         struct device_node *target;
1438 };
1439 
1440 #ifdef CONFIG_OF_OVERLAY
1441 
1442 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
1443                          int *ovcs_id);
1444 int of_overlay_remove(int *ovcs_id);
1445 int of_overlay_remove_all(void);
1446 
1447 int of_overlay_notifier_register(struct notifier_block *nb);
1448 int of_overlay_notifier_unregister(struct notifier_block *nb);
1449 
1450 #else
1451 
1452 static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size,
1453                                        int *ovcs_id)
1454 {
1455         return -ENOTSUPP;
1456 }
1457 
1458 static inline int of_overlay_remove(int *ovcs_id)
1459 {
1460         return -ENOTSUPP;
1461 }
1462 
1463 static inline int of_overlay_remove_all(void)
1464 {
1465         return -ENOTSUPP;
1466 }
1467 
1468 static inline int of_overlay_notifier_register(struct notifier_block *nb)
1469 {
1470         return 0;
1471 }
1472 
1473 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
1474 {
1475         return 0;
1476 }
1477 
1478 #endif
1479 
1480 #endif /* _LINUX_OF_H */
1481 

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