summaryrefslogtreecommitdiff
path: root/include/linux/of.h
blob: a5aee3c438ade1e592411b875aa4bd0c064fdbc4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _LINUX_OF_H
#define _LINUX_OF_H
/*
 * Definitions for talking to the Open Firmware PROM on
 * Power Macintosh and other computers.
 *
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
 * Updates for SPARC64 by David S. Miller
 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
 */
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/kobject.h>
#include <linux/mod_devicetable.h>
#include <linux/spinlock.h>
#include <linux/topology.h>
#include <linux/notifier.h>
#include <linux/property.h>
#include <linux/list.h>

#include <asm/byteorder.h>
#include <asm/errno.h>

typedef u32 phandle;
typedef u32 ihandle;

struct property {
	char	*name;
	int	length;
	void	*value;
	struct property *next;
#if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
	unsigned long _flags;
#endif
#if defined(CONFIG_OF_PROMTREE)
	unsigned int unique_id;
#endif
#if defined(CONFIG_OF_KOBJ)
	struct bin_attribute attr;
#endif
};

#if defined(CONFIG_SPARC)
struct of_irq_controller;
#endif

struct device_node {
	const char *name;
	const char *type;
	phandle phandle;
	const char *full_name;
	struct fwnode_handle fwnode;

	struct	property *properties;
	struct	property *deadprops;	/* removed properties */
	struct	device_node *parent;
	struct	device_node *child;
	struct	device_node *sibling;
#if defined(CONFIG_OF_KOBJ)
	struct	kobject kobj;
#endif
	unsigned long _flags;
	void	*data;
#if defined(CONFIG_SPARC)
	const char *path_component_name;
	unsigned int unique_id;
	struct of_irq_controller *irq_trans;
#endif
};

#define MAX_PHANDLE_ARGS 16
struct of_phandle_args {
	struct device_node *np;
	int args_count;
	uint32_t args[MAX_PHANDLE_ARGS];
};

struct of_phandle_iterator {
	/* Common iterator information */
	const char *cells_name;
	int cell_count;
	const struct device_node *parent;

	/* List size information */
	const __be32 *list_end;
	const __be32 *phandle_end;

	/* Current position state */
	const __be32 *cur;
	uint32_t cur_count;
	phandle phandle;
	struct device_node *node;
};

struct of_reconfig_data {
	struct device_node	*dn;
	struct property		*prop;
	struct property		*old_prop;
};

/* initialize a node */
extern struct kobj_type of_node_ktype;
extern const struct fwnode_operations of_fwnode_ops;
static inline void of_node_init(struct device_node *node)
{
#if defined(CONFIG_OF_KOBJ)
	kobject_init(&node->kobj, &of_node_ktype);
#endif
	node->fwnode.ops = &of_fwnode_ops;
}

#if defined(CONFIG_OF_KOBJ)
#define of_node_kobj(n) (&(n)->kobj)
#else
#define of_node_kobj(n) NULL
#endif

#ifdef CONFIG_OF_DYNAMIC
extern struct device_node *of_node_get(struct device_node *node);
extern void of_node_put(struct device_node *node);
#else /* CONFIG_OF_DYNAMIC */
/* Dummy ref counting routines - to be implemented later */
static inline struct device_node *of_node_get(struct device_node *node)
{
	return node;
}
static inline void of_node_put(struct device_node *node) { }
#endif /* !CONFIG_OF_DYNAMIC */

/* Pointer for first entry in chain of all nodes. */
extern struct device_node *of_root;
extern struct device_node *of_chosen;
extern struct device_node *of_aliases;
extern struct device_node *of_stdout;
extern raw_spinlock_t devtree_lock;

/* flag descriptions (need to be visible even when !CONFIG_OF) */
#define OF_DYNAMIC	1 /* node and properties were allocated via kmalloc */
#define OF_DETACHED	2 /* node has been detached from the device tree */
#define OF_POPULATED	3 /* device already created for the node */
#define OF_POPULATED_BUS	4 /* of_platform_populate recursed to children of this node */

#define OF_BAD_ADDR	((u64)-1)

#ifdef CONFIG_OF
void of_core_init(void);

static inline bool is_of_node(const struct fwnode_handle *fwnode)
{
	return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops;
}

#define to_of_node(__fwnode)						\
	({								\
		typeof(__fwnode) __to_of_node_fwnode = (__fwnode);	\
									\
		is_of_node(__to_of_node_fwnode) ?			\
			container_of(__to_of_node_fwnode,		\
				     struct device_node, fwnode) :	\
			NULL;						\
	})

#define of_fwnode_handle(node)						\
	({								\
		typeof(node) __of_fwnode_handle_node = (node);		\
									\
		__of_fwnode_handle_node ?				\
			&__of_fwnode_handle_node->fwnode : NULL;	\
	})

static inline bool of_have_populated_dt(void)
{
	return of_root != NULL;
}

static inline bool of_node_is_root(const struct device_node *node)
{
	return node && (node->parent == NULL);
}

static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
{
	return test_bit(flag, &n->_flags);
}

static inline int of_node_test_and_set_flag(struct device_node *n,
					    unsigned long flag)
{
	return test_and_set_bit(flag, &n->_flags);
}

static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
{
	set_bit(flag, &n->_flags);
}

static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
{
	clear_bit(flag, &n->_flags);
}

#if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
static inline int of_property_check_flag(struct property *p, unsigned long flag)
{
	return test_bit(flag, &p->_flags);
}

static inline void of_property_set_flag(struct property *p, unsigned long flag)
{
	set_bit(flag, &p->_flags);
}

static inline void of_property_clear_flag(struct property *p, unsigned long flag)
{
	clear_bit(flag, &p->_flags);
}
#endif

extern struct device_node *__of_find_all_nodes(struct device_node *prev);
extern struct device_node *of_find_all_nodes(struct device_node *prev);

/*
 * OF address retrieval & translation
 */

/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const __be32 *cell, int size)
{
	u64 r = 0;
	while (size--)
		r = (r << 32) | be32_to_cpu(*(cell++));
	return r;
}

/* Like of_read_number, but we want an unsigned long result */
static inline unsigned long of_read_ulong(const __be32 *cell, int size)
{
	/* toss away upper bits if unsigned long is smaller than u64 */
	return of_read_number(cell, size);
}

#if defined(CONFIG_SPARC)
#include <asm/prom.h>
#endif

#define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
#define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)

extern bool of_node_name_eq(const struct device_node *np, const char *name);
extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);

static inline const char *of_node_full_name(const struct device_node *np)
{
	return np ? np->full_name : "<no-node>";
}

#define for_each_of_allnodes_from(from, dn) \
	for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
extern struct device_node *of_find_node_by_name(struct device_node *from,
	const char *name);
extern struct device_node *of_find_node_by_type(struct device_node *from,
	const char *type);
extern struct device_node *of_find_compatible_node(struct device_node *from,
	const char *type, const char *compat);
extern struct device_node *of_find_matching_node_and_match(
	struct device_node *from,
	const struct of_device_id *matches,
	const struct of_device_id **match);

extern struct device_node *of_find_node_opts_by_path(const char *path,
	const char **opts);
static inline struct device_node *of_find_node_by_path(const char *path)
{
	return of_find_node_opts_by_path(path, NULL);
}

extern struct device_node *of_find_node_by_phandle(phandle handle);
extern struct device_node *of_get_parent(const struct device_node *node);
extern struct device_node *of_get_next_parent(struct device_node *node);
extern struct device_node *of_get_next_child(const struct device_node *node,
					     struct device_node *prev);
extern struct device_node *of_get_next_available_child(
	const struct device_node *node, struct device_node *prev);

extern struct device_node *of_get_compatible_child(const struct device_node *parent,
					const char *compatible);
extern struct device_node *of_get_child_by_name(const struct device_node *node,
					const char *name);

/* cache lookup */
extern struct device_node *of_find_next_cache_node(const struct device_node *);
extern int of_find_last_cache_level(unsigned int cpu);
extern struct device_node *of_find_node_with_property(
	struct device_node *from, const char *prop_name);

extern struct property *of_find_property(const struct device_node *np,
					 const char *name,
					 int *lenp);
extern int of_property_count_elems_of_size(const struct device_node *np,
				const char *propname, int elem_size);
extern int of_property_read_u32_index(const struct device_node *np,
				       const char *propname,
				       u32 index, u32 *out_value);
extern int of_property_read_u64_index(const struct device_node *np,
				       const char *propname,
				       u32 index, u64 *out_value);
extern int of_property_read_variable_u8_array(const struct device_node *np,
					const char *propname, u8 *out_values,
					size_t sz_min, size_t sz_max);
extern int of_property_read_variable_u16_array(const struct device_node *np,
					const char *propname, u16 *out_values,
					size_t sz_min, size_t sz_max);
extern int of_property_read_variable_u32_array(const struct device_node *np,
					const char *propname,
					u32 *out_values,
					size_t sz_min,
					size_t sz_max);
extern int of_property_read_u64(const struct device_node *np,
				const char *propname, u64 *out_value);
extern int of_property_read_variable_u64_array(const struct device_node *np,
					const char *propname,
					u64 *out_values,
					size_t sz_min,
					size_t sz_max);

extern int of_property_read_string(const struct device_node *np,
				   const char *propname,
				   const char **out_string);
extern int of_property_match_string(const struct device_node *np,
				    const char *propname,
				    const char *string);
extern int of_property_read_string_helper(const struct device_node *np,
					      const char *propname,
					      const char **out_strs, size_t sz, int index);
extern int of_device_is_compatible(const struct device_node *device,
				   const char *);
extern int of_device_compatible_match(struct device_node *device,
				      const char *const *compat);
extern bool of_device_is_available(const struct device_node *device);
extern bool of_device_is_big_endian(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
				const char *name,
				int *lenp);
extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
extern struct device_node *of_get_next_cpu_node(struct device_node *prev);

#define for_each_property_of_node(dn, pp) \
	for (pp = dn->properties; pp != NULL; pp = pp->next)

extern int of_n_addr_cells(struct device_node *np);
extern int of_n_size_cells(struct device_node *np);
extern const struct of_device_id *of_match_node(
	const struct of_device_id *matches, const struct device_node *node);
extern int of_modalias_node(struct device_node *node, char *modalias, int len);
extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
extern struct device_node *of_parse_phandle(const struct device_node *np,
					    const char *phandle_name,
					    int index);
extern int of_parse_phandle_with_args(const struct device_node *np,
	const char *list_name, const char *cells_name, int index,
	struct of_phandle_args *out_args);
extern int of_parse_phandle_with_args_map(const struct device_node *np,
	const char *list_name, const char *stem_name, int index,
	struct of_phandle_args *out_args);
extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
	const char *list_name, int cells_count, int index,
	struct of_phandle_args *out_args);
extern int of_count_phandle_with_args(const struct device_node *np,
	const char *list_name, const char *cells_name);

/* phandle iterator functions */
extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
				    const struct device_node *np,
				    const char *list_name,
				    const char *cells_name,
				    int cell_count);

extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
				    uint32_t *args,
				    int size);

extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
extern int of_alias_get_id(struct device_node *np, const char *stem);
extern int of_alias_get_highest_id(const char *stem);
extern int of_alias_get_alias_list(const struct of_device_id *matches,
				   const char *stem, unsigned long *bitmap,
				   unsigned int nbits);

extern int of_machine_is_compatible(const char *compat);

extern int of_add_property(struct device_node *np, struct property *prop);
extern int of_remove_property(struct device_node *np, struct property *prop);
extern int of_update_property(struct device_node *np, struct property *newprop);

/* For updating the device tree at runtime */
#define OF_RECONFIG_ATTACH_NODE		0x0001
#define OF_RECONFIG_DETACH_NODE		0x0002
#define OF_RECONFIG_ADD_PROPERTY	0x0003
#define OF_RECONFIG_REMOVE_PROPERTY	0x0004
#define OF_RECONFIG_UPDATE_PROPERTY	0x0005

extern int of_attach_node(struct device_node *);
extern int of_detach_node(struct device_node *);

#define of_match_ptr(_ptr)	(_ptr)

/**
 * of_property_read_u8_array - Find and read an array of u8 from a property.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to return value, modified only if return value is 0.
 * @sz:		number of array elements to read
 *
 * Search for a property in a device node and read 8-bit value(s) from
 * it. Returns 0 on success, -EINVAL if the property does not exist,
 * -ENODATA if property does not have a value, and -EOVERFLOW if the
 * property data isn't large enough.
 *
 * dts entry of array should be like:
 *	property = /bits/ 8 <0x50 0x60 0x70>;
 *
 * The out_values is modified only if a valid u8 value can be decoded.
 */
static inline int of_property_read_u8_array(const struct device_node *np,
					    const char *propname,
					    u8 *out_values, size_t sz)
{
	int ret = of_property_read_variable_u8_array(np, propname, out_values,
						     sz, 0);
	if (ret >= 0)
		return 0;
	else
		return ret;
}

/**
 * of_property_read_u16_array - Find and read an array of u16 from a property.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to return value, modified only if return value is 0.
 * @sz:		number of array elements to read
 *
 * Search for a property in a device node and read 16-bit value(s) from
 * it. Returns 0 on success, -EINVAL if the property does not exist,
 * -ENODATA if property does not have a value, and -EOVERFLOW if the
 * property data isn't large enough.
 *
 * dts entry of array should be like:
 *	property = /bits/ 16 <0x5000 0x6000 0x7000>;
 *
 * The out_values is modified only if a valid u16 value can be decoded.
 */
static inline int of_property_read_u16_array(const struct device_node *np,
					     const char *propname,
					     u16 *out_values, size_t sz)
{
	int ret = of_property_read_variable_u16_array(np, propname, out_values,
						      sz, 0);
	if (ret >= 0)
		return 0;
	else
		return ret;
}

/**
 * of_property_read_u32_array - Find and read an array of 32 bit integers
 * from a property.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to return value, modified only if return value is 0.
 * @sz:		number of array elements to read
 *
 * Search for a property in a device node and read 32-bit value(s) from
 * it. Returns 0 on success, -EINVAL if the property does not exist,
 * -ENODATA if property does not have a value, and -EOVERFLOW if the
 * property data isn't large enough.
 *
 * The out_values is modified only if a valid u32 value can be decoded.
 */
static inline int of_property_read_u32_array(const struct device_node *np,
					     const char *propname,
					     u32 *out_values, size_t sz)
{
	int ret = of_property_read_variable_u32_array(np, propname, out_values,
						      sz, 0);
	if (ret >= 0)
		return 0;
	else
		return ret;
}

/**
 * of_property_read_u64_array - Find and read an array of 64 bit integers
 * from a property.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to return value, modified only if return value is 0.
 * @sz:		number of array elements to read
 *
 * Search for a property in a device node and read 64-bit value(s) from
 * it. Returns 0 on success, -EINVAL if the property does not exist,
 * -ENODATA if property does not have a value, and -EOVERFLOW if the
 * property data isn't large enough.
 *
 * The out_values is modified only if a valid u64 value can be decoded.
 */
static inline int of_property_read_u64_array(const struct device_node *np,
					     const char *propname,
					     u64 *out_values, size_t sz)
{
	int ret = of_property_read_variable_u64_array(np, propname, out_values,
						      sz, 0);
	if (ret >= 0)
		return 0;
	else
		return ret;
}

/*
 * struct property *prop;
 * const __be32 *p;
 * u32 u;
 *
 * of_property_for_each_u32(np, "propname", prop, p, u)
 *         printk("U32 value: %x\n", u);
 */
const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
			       u32 *pu);
/*
 * struct property *prop;
 * const char *s;
 *
 * of_property_for_each_string(np, "propname", prop, s)
 *         printk("String value: %s\n", s);
 */
const char *of_prop_next_string(struct property *prop, const char *cur);

bool of_console_check(struct device_node *dn, char *name, int index);

extern int of_cpu_node_to_id(struct device_node *np);

int of_map_rid(struct device_node *np, u32 rid,
	       const char *map_name, const char *map_mask_name,
	       struct device_node **target, u32 *id_out);

#else /* CONFIG_OF */

static inline void of_core_init(void)
{
}

static inline bool is_of_node(const struct fwnode_handle *fwnode)
{
	return false;
}

static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
{
	return NULL;
}

static inline bool of_node_name_eq(const struct device_node *np, const char *name)
{
	return false;
}

static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
{
	return false;
}

static inline const char* of_node_full_name(const struct device_node *np)
{
	return "<no-node>";
}

static inline struct device_node *of_find_node_by_name(struct device_node *from,
	const char *name)
{
	return NULL;
}

static inline struct device_node *of_find_node_by_type(struct device_node *from,
	const char *type)
{
	return NULL;
}

static inline struct device_node *of_find_matching_node_and_match(
	struct device_node *from,
	const struct of_device_id *matches,
	const struct of_device_id **match)
{
	return NULL;
}

static inline struct device_node *of_find_node_by_path(const char *path)
{
	return NULL;
}

static inline struct device_node *of_find_node_opts_by_path(const char *path,
	const char **opts)
{
	return NULL;
}

static inline struct device_node *of_find_node_by_phandle(phandle handle)
{
	return NULL;
}

static inline struct device_node *of_get_parent(const struct device_node *node)
{
	return NULL;
}

static inline struct device_node *of_get_next_child(
	const struct device_node *node, struct device_node *prev)
{
	return NULL;
}

static inline struct device_node *of_get_next_available_child(
	const struct device_node *node, struct device_node *prev)
{
	return NULL;
}

static inline struct device_node *of_find_node_with_property(
	struct device_node *from, const char *prop_name)
{
	return NULL;
}

#define of_fwnode_handle(node) NULL

static inline bool of_have_populated_dt(void)
{
	return false;
}

static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
					const char *compatible)
{
	return NULL;
}

static inline struct device_node *of_get_child_by_name(
					const struct device_node *node,
					const char *name)
{
	return NULL;
}

static inline int of_device_is_compatible(const struct device_node *device,
					  const char *name)
{
	return 0;
}

static inline  int of_device_compatible_match(struct device_node *device,
					      const char *const *compat)
{
	return 0;
}

static inline bool of_device_is_available(const struct device_node *device)
{
	return false;
}

static inline bool of_device_is_big_endian(const struct device_node *device)
{
	return false;
}

static inline struct property *of_find_property(const struct device_node *np,
						const char *name,
						int *lenp)
{
	return NULL;
}

static inline struct device_node *of_find_compatible_node(
						struct device_node *from,
						const char *type,
						const char *compat)
{
	return NULL;
}

static inline int of_property_count_elems_of_size(const struct device_node *np,
			const char *propname, int elem_size)
{
	return -ENOSYS;
}

static inline int of_property_read_u8_array(const struct device_node *np,
			const char *propname, u8 *out_values, size_t sz)
{
	return -ENOSYS;
}

static inline int of_property_read_u16_array(const struct device_node *np,
			const char *propname, u16 *out_values, size_t sz)
{
	return -ENOSYS;
}

static inline int of_property_read_u32_array(const struct device_node *np,
					     const char *propname,
					     u32 *out_values, size_t sz)
{
	return -ENOSYS;
}

static inline int of_property_read_u64_array(const struct device_node *np,
					     const char *propname,
					     u64 *out_values, size_t sz)
{
	return -ENOSYS;
}

static inline int of_property_read_u32_index(const struct device_node *np,
			const char *propname, u32 index, u32 *out_value)
{
	return -ENOSYS;
}

static inline int of_property_read_u64_index(const struct device_node *np,
			const char *propname, u32 index, u64 *out_value)
{
	return -ENOSYS;
}

static inline const void *of_get_property(const struct device_node *node,
				const char *name,
				int *lenp)
{
	return NULL;
}

static inline struct device_node *of_get_cpu_node(int cpu,
					unsigned int *thread)
{
	return NULL;
}

static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
{
	return NULL;
}

static inline int of_n_addr_cells(struct device_node *np)
{
	return 0;

}
static inline int of_n_size_cells(struct device_node *np)
{
	return 0;
}

static inline int of_property_read_variable_u8_array(const struct device_node *np,
					const char *propname, u8 *out_values,
					size_t sz_min, size_t sz_max)
{
	return -ENOSYS;
}

static inline int of_property_read_variable_u16_array(const struct device_node *np,
					const char *propname, u16 *out_values,
					size_t sz_min, size_t sz_max)
{
	return -ENOSYS;
}

static inline int of_property_read_variable_u32_array(const struct device_node *np,
					const char *propname,
					u32 *out_values,
					size_t sz_min,
					size_t sz_max)
{
	return -ENOSYS;
}

static inline int of_property_read_u64(const struct device_node *np,
				       const char *propname, u64 *out_value)
{
	return -ENOSYS;
}

static inline int of_property_read_variable_u64_array(const struct device_node *np,
					const char *propname,
					u64 *out_values,
					size_t sz_min,
					size_t sz_max)
{
	return -ENOSYS;
}

static inline int of_property_read_string(const struct device_node *np,
					  const char *propname,
					  const char **out_string)
{
	return -ENOSYS;
}

static inline int of_property_match_string(const struct device_node *np,
					   const char *propname,
					   const char *string)
{
	return -ENOSYS;
}

static inline int of_property_read_string_helper(const struct device_node *np,
						 const char *propname,
						 const char **out_strs, size_t sz, int index)
{
	return -ENOSYS;
}

static inline struct device_node *of_parse_phandle(const struct device_node *np,
						   const char *phandle_name,
						   int index)
{
	return NULL;
}

static inline int of_parse_phandle_with_args(const struct device_node *np,
					     const char *list_name,
					     const char *cells_name,
					     int index,
					     struct of_phandle_args *out_args)
{
	return -ENOSYS;
}

static inline int of_parse_phandle_with_args_map(const struct device_node *np,
						 const char *list_name,
						 const char *stem_name,
						 int index,
						 struct of_phandle_args *out_args)
{
	return -ENOSYS;
}

static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
	const char *list_name, int cells_count, int index,
	struct of_phandle_args *out_args)
{
	return -ENOSYS;
}

static inline int of_count_phandle_with_args(struct device_node *np,
					     const char *list_name,
					     const char *cells_name)
{
	return -ENOSYS;
}

static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
					   const struct device_node *np,
					   const char *list_name,
					   const char *cells_name,
					   int cell_count)
{
	return -ENOSYS;
}

static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
{
	return -ENOSYS;
}

static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
					   uint32_t *args,
					   int size)
{
	return 0;
}

static inline int of_alias_get_id(struct device_node *np, const char *stem)
{
	return -ENOSYS;
}

static inline int of_alias_get_highest_id(const char *stem)
{
	return -ENOSYS;
}

static inline int of_alias_get_alias_list(const struct of_device_id *matches,
					  const char *stem, unsigned long *bitmap,
					  unsigned int nbits)
{
	return -ENOSYS;
}

static inline int of_machine_is_compatible(const char *compat)
{
	return 0;
}

static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
{
	return false;
}

static inline const __be32 *of_prop_next_u32(struct property *prop,
		const __be32 *cur, u32 *pu)
{
	return NULL;
}

static inline const char *of_prop_next_string(struct property *prop,
		const char *cur)
{
	return NULL;
}

static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
{
	return 0;
}

static inline int of_node_test_and_set_flag(struct device_node *n,
					    unsigned long flag)
{
	return 0;
}

static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
{
}

static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
{
}

static inline int of_property_check_flag(struct property *p, unsigned long flag)
{
	return 0;
}

static inline void of_property_set_flag(struct property *p, unsigned long flag)
{
}

static inline void of_property_clear_flag(struct property *p, unsigned long flag)
{
}

static inline int of_cpu_node_to_id(struct device_node *np)
{
	return -ENODEV;
}

static inline int of_map_rid(struct device_node *np, u32 rid,
			     const char *map_name, const char *map_mask_name,
			     struct device_node **target, u32 *id_out)
{
	return -EINVAL;
}

#define of_match_ptr(_ptr)	NULL
#define of_match_node(_matches, _node)	NULL
#endif /* CONFIG_OF */

/* Default string compare functions, Allow arch asm/prom.h to override */
#if !defined(of_compat_cmp)
#define of_compat_cmp(s1, s2, l)	strcasecmp((s1), (s2))
#define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
#define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
#endif

#if defined(CONFIG_OF) && defined(CONFIG_NUMA)
extern int of_node_to_nid(struct device_node *np);
#else
static inline int of_node_to_nid(struct device_node *device)
{
	return NUMA_NO_NODE;
}
#endif

#ifdef CONFIG_OF_NUMA
extern int of_numa_init(void);
#else
static inline int of_numa_init(void)
{
	return -ENOSYS;
}
#endif

static inline struct device_node *of_find_matching_node(
	struct device_node *from,
	const struct of_device_id *matches)
{
	return of_find_matching_node_and_match(from, matches, NULL);
}

static inline const char *of_node_get_device_type(const struct device_node *np)
{
	return of_get_property(np, "device_type", NULL);
}

static inline bool of_node_is_type(const struct device_node *np, const char *type)
{
	const char *match = of_node_get_device_type(np);

	return np && match && type && !strcmp(match, type);
}

/**
 * of_property_count_u8_elems - Count the number of u8 elements in a property
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device node and count the number of u8 elements
 * in it. Returns number of elements on sucess, -EINVAL if the property does
 * not exist or its length does not match a multiple of u8 and -ENODATA if the
 * property does not have a value.
 */
static inline int of_property_count_u8_elems(const struct device_node *np,
				const char *propname)
{
	return of_property_count_elems_of_size(np, propname, sizeof(u8));
}

/**
 * of_property_count_u16_elems - Count the number of u16 elements in a property
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device node and count the number of u16 elements
 * in it. Returns number of elements on sucess, -EINVAL if the property does
 * not exist or its length does not match a multiple of u16 and -ENODATA if the
 * property does not have a value.
 */
static inline int of_property_count_u16_elems(const struct device_node *np,
				const char *propname)
{
	return of_property_count_elems_of_size(np, propname, sizeof(u16));
}

/**
 * of_property_count_u32_elems - Count the number of u32 elements in a property
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device node and count the number of u32 elements
 * in it. Returns number of elements on sucess, -EINVAL if the property does
 * not exist or its length does not match a multiple of u32 and -ENODATA if the
 * property does not have a value.
 */
static inline int of_property_count_u32_elems(const struct device_node *np,
				const char *propname)
{
	return of_property_count_elems_of_size(np, propname, sizeof(u32));
}

/**
 * of_property_count_u64_elems - Count the number of u64 elements in a property
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device node and count the number of u64 elements
 * in it. Returns number of elements on sucess, -EINVAL if the property does
 * not exist or its length does not match a multiple of u64 and -ENODATA if the
 * property does not have a value.
 */
static inline int of_property_count_u64_elems(const struct device_node *np,
				const char *propname)
{
	return of_property_count_elems_of_size(np, propname, sizeof(u64));
}

/**
 * of_property_read_string_array() - Read an array of strings from a multiple
 * strings property.
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_strs:	output array of string pointers.
 * @sz:		number of array elements to read.
 *
 * Search for a property in a device tree node and retrieve a list of
 * terminated string values (pointer to data, not a copy) in that property.
 *
 * If @out_strs is NULL, the number of strings in the property is returned.
 */
static inline int of_property_read_string_array(const struct device_node *np,
						const char *propname, const char **out_strs,
						size_t sz)
{
	return of_property_read_string_helper(np, propname, out_strs, sz, 0);
}

/**
 * of_property_count_strings() - Find and return the number of strings from a
 * multiple strings property.
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device tree node and retrieve the number of null
 * terminated string contain in it. Returns the number of strings on
 * success, -EINVAL if the property does not exist, -ENODATA if property
 * does not have a value, and -EILSEQ if the string is not null-terminated
 * within the length of the property data.
 */
static inline int of_property_count_strings(const struct device_node *np,
					    const char *propname)
{
	return of_property_read_string_helper(np, propname, NULL, 0, 0);
}

/**
 * of_property_read_string_index() - Find and read a string from a multiple
 * strings property.
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @index:	index of the string in the list of strings
 * @out_string:	pointer to null terminated return string, modified only if
 *		return value is 0.
 *
 * Search for a property in a device tree node and retrieve a null
 * terminated string value (pointer to data, not a copy) in the list of strings
 * contained in that property.
 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
 * property does not have a value, and -EILSEQ if the string is not
 * null-terminated within the length of the property data.
 *
 * The out_string pointer is modified only if a valid string can be decoded.
 */
static inline int of_property_read_string_index(const struct device_node *np,
						const char *propname,
						int index, const char **output)
{
	int rc = of_property_read_string_helper(np, propname, output, 1, index);
	return rc < 0 ? rc : 0;
}

/**
 * of_property_read_bool - Findfrom a property
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 *
 * Search for a property in a device node.
 * Returns true if the property exists false otherwise.
 */
static inline bool of_property_read_bool(const struct device_node *np,
					 const char *propname)
{
	struct property *prop = of_find_property(np, propname, NULL);

	return prop ? true : false;
}

static inline int of_property_read_u8(const struct device_node *np,
				       const char *propname,
				       u8 *out_value)
{
	return of_property_read_u8_array(np, propname, out_value, 1);
}

static inline int of_property_read_u16(const struct device_node *np,
				       const char *propname,
				       u16 *out_value)
{
	return of_property_read_u16_array(np, propname, out_value, 1);
}

static inline int of_property_read_u32(const struct device_node *np,
				       const char *propname,
				       u32 *out_value)
{
	return of_property_read_u32_array(np, propname, out_value, 1);
}

static inline int of_property_read_s32(const struct device_node *np,
				       const char *propname,
				       s32 *out_value)
{
	return of_property_read_u32(np, propname, (u32*) out_value);
}

#define of_for_each_phandle(it, err, np, ln, cn, cc)			\
	for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)),	\
	     err = of_phandle_iterator_next(it);			\
	     err == 0;							\
	     err = of_phandle_iterator_next(it))

#define of_property_for_each_u32(np, propname, prop, p, u)	\
	for (prop = of_find_property(np, propname, NULL),	\
		p = of_prop_next_u32(prop, NULL, &u);		\
		p;						\
		p = of_prop_next_u32(prop, p, &u))

#define of_property_for_each_string(np, propname, prop, s)	\
	for (prop = of_find_property(np, propname, NULL),	\
		s = of_prop_next_string(prop, NULL);		\
		s;						\
		s = of_prop_next_string(prop, s))

#define for_each_node_by_name(dn, name) \
	for (dn = of_find_node_by_name(NULL, name); dn; \
	     dn = of_find_node_by_name(dn, name))
#define for_each_node_by_type(dn, type) \
	for (dn = of_find_node_by_type(NULL, type); dn; \
	     dn = of_find_node_by_type(dn, type))
#define for_each_compatible_node(dn, type, compatible) \
	for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
	     dn = of_find_compatible_node(dn, type, compatible))
#define for_each_matching_node(dn, matches) \
	for (dn = of_find_matching_node(NULL, matches); dn; \
	     dn = of_find_matching_node(dn, matches))
#define for_each_matching_node_and_match(dn, matches, match) \
	for (dn = of_find_matching_node_and_match(NULL, matches, match); \
	     dn; dn = of_find_matching_node_and_match(dn, matches, match))

#define for_each_child_of_node(parent, child) \
	for (child = of_get_next_child(parent, NULL); child != NULL; \
	     child = of_get_next_child(parent, child))
#define for_each_available_child_of_node(parent, child) \
	for (child = of_get_next_available_child(parent, NULL); child != NULL; \
	     child = of_get_next_available_child(parent, child))

#define for_each_of_cpu_node(cpu) \
	for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
	     cpu = of_get_next_cpu_node(cpu))

#define for_each_node_with_property(dn, prop_name) \
	for (dn = of_find_node_with_property(NULL, prop_name); dn; \
	     dn = of_find_node_with_property(dn, prop_name))

static inline int of_get_child_count(const struct device_node *np)
{
	struct device_node *child;
	int num = 0;

	for_each_child_of_node(np, child)
		num++;

	return num;
}

static inline int of_get_available_child_count(const struct device_node *np)
{
	struct device_node *child;
	int num = 0;

	for_each_available_child_of_node(np, child)
		num++;

	return num;
}

#if defined(CONFIG_OF) && !defined(MODULE)
#define _OF_DECLARE(table, name, compat, fn, fn_type)			\
	static const struct of_device_id __of_table_##name		\
		__used __section(__##table##_of_table)			\
		 = { .compatible = compat,				\
		     .data = (fn == (fn_type)NULL) ? fn : fn  }
#else
#define _OF_DECLARE(table, name, compat, fn, fn_type)			\
	static const struct of_device_id __of_table_##name		\
		__attribute__((unused))					\
		 = { .compatible = compat,				\
		     .data = (fn == (fn_type)NULL) ? fn : fn }
#endif

typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
typedef int (*of_init_fn_1_ret)(struct device_node *);
typedef void (*of_init_fn_1)(struct device_node *);

#define OF_DECLARE_1(table, name, compat, fn) \
		_OF_DECLARE(table, name, compat, fn, of_init_fn_1)
#define OF_DECLARE_1_RET(table, name, compat, fn) \
		_OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
#define OF_DECLARE_2(table, name, compat, fn) \
		_OF_DECLARE(table, name, compat, fn, of_init_fn_2)

/**
 * struct of_changeset_entry	- Holds a changeset entry
 *
 * @node:	list_head for the log list
 * @action:	notifier action
 * @np:		pointer to the device node affected
 * @prop:	pointer to the property affected
 * @old_prop:	hold a pointer to the original property
 *
 * Every modification of the device tree during a changeset
 * is held in a list of of_changeset_entry structures.
 * That way we can recover from a partial application, or we can
 * revert the changeset
 */
struct of_changeset_entry {
	struct list_head node;
	unsigned long action;
	struct device_node *np;
	struct property *prop;
	struct property *old_prop;
};

/**
 * struct of_changeset - changeset tracker structure
 *
 * @entries:	list_head for the changeset entries
 *
 * changesets are a convenient way to apply bulk changes to the
 * live tree. In case of an error, changes are rolled-back.
 * changesets live on after initial application, and if not
 * destroyed after use, they can be reverted in one single call.
 */
struct of_changeset {
	struct list_head entries;
};

enum of_reconfig_change {
	OF_RECONFIG_NO_CHANGE = 0,
	OF_RECONFIG_CHANGE_ADD,
	OF_RECONFIG_CHANGE_REMOVE,
};

#ifdef CONFIG_OF_DYNAMIC
extern int of_reconfig_notifier_register(struct notifier_block *);
extern int of_reconfig_notifier_unregister(struct notifier_block *);
extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
extern int of_reconfig_get_state_change(unsigned long action,
					struct of_reconfig_data *arg);

extern void of_changeset_init(struct of_changeset *ocs);
extern void of_changeset_destroy(struct of_changeset *ocs);
extern int of_changeset_apply(struct of_changeset *ocs);
extern int of_changeset_revert(struct of_changeset *ocs);
extern int of_changeset_action(struct of_changeset *ocs,
		unsigned long action, struct device_node *np,
		struct property *prop);

static inline int of_changeset_attach_node(struct of_changeset *ocs,
		struct device_node *np)
{
	return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
}

static inline int of_changeset_detach_node(struct of_changeset *ocs,
		struct device_node *np)
{
	return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
}

static inline int of_changeset_add_property(struct of_changeset *ocs,
		struct device_node *np, struct property *prop)
{
	return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
}

static inline int of_changeset_remove_property(struct of_changeset *ocs,
		struct device_node *np, struct property *prop)
{
	return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
}

static inline int of_changeset_update_property(struct of_changeset *ocs,
		struct device_node *np, struct property *prop)
{
	return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
}
#else /* CONFIG_OF_DYNAMIC */
static inline int of_reconfig_notifier_register(struct notifier_block *nb)
{
	return -EINVAL;
}
static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
{
	return -EINVAL;
}
static inline int of_reconfig_notify(unsigned long action,
				     struct of_reconfig_data *arg)
{
	return -EINVAL;
}
static inline int of_reconfig_get_state_change(unsigned long action,
						struct of_reconfig_data *arg)
{
	return -EINVAL;
}
#endif /* CONFIG_OF_DYNAMIC */

/**
 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
 * @np: Pointer to the given device_node
 *
 * return true if present false otherwise
 */
static inline bool of_device_is_system_power_controller(const struct device_node *np)
{
	return of_property_read_bool(np, "system-power-controller");
}

/**
 * Overlay support
 */

enum of_overlay_notify_action {
	OF_OVERLAY_PRE_APPLY = 0,
	OF_OVERLAY_POST_APPLY,
	OF_OVERLAY_PRE_REMOVE,
	OF_OVERLAY_POST_REMOVE,
};

struct of_overlay_notify_data {
	struct device_node *overlay;
	struct device_node *target;
};

#ifdef CONFIG_OF_OVERLAY

int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
			 int *ovcs_id);
int of_overlay_remove(int *ovcs_id);
int of_overlay_remove_all(void);

int of_overlay_notifier_register(struct notifier_block *nb);
int of_overlay_notifier_unregister(struct notifier_block *nb);

#else

static inline int of_overlay_fdt_apply(void *overlay_fdt, int *ovcs_id)
{
	return -ENOTSUPP;
}

static inline int of_overlay_remove(int *ovcs_id)
{
	return -ENOTSUPP;
}

static inline int of_overlay_remove_all(void)
{
	return -ENOTSUPP;
}

static inline int of_overlay_notifier_register(struct notifier_block *nb)
{
	return 0;
}

static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
{
	return 0;
}

#endif

#endif /* _LINUX_OF_H */