summaryrefslogtreecommitdiff
path: root/drivers/of/property.c
blob: 134cfc980b70b307aa820a056bbc58df6eb700df (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
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
// SPDX-License-Identifier: GPL-2.0+
/*
 * drivers/of/property.c - Procedures for accessing and interpreting
 *			   Devicetree properties and graphs.
 *
 * Initially created by copying procedures from drivers/of/base.c. This
 * file contains the OF property as well as the OF graph interface
 * functions.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com
 *
 *  Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net
 *
 *  Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and
 *  Grant Likely.
 */

#define pr_fmt(fmt)	"OF: " fmt

#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/of_irq.h>
#include <linux/string.h>
#include <linux/moduleparam.h>

#include "of_private.h"

/**
 * of_graph_is_present() - check graph's presence
 * @node: pointer to device_node containing graph port
 *
 * Return: True if @node has a port or ports (with a port) sub-node,
 * false otherwise.
 */
bool of_graph_is_present(const struct device_node *node)
{
	struct device_node *ports, *port;

	ports = of_get_child_by_name(node, "ports");
	if (ports)
		node = ports;

	port = of_get_child_by_name(node, "port");
	of_node_put(ports);
	of_node_put(port);

	return !!port;
}
EXPORT_SYMBOL(of_graph_is_present);

/**
 * of_property_count_elems_of_size - Count the number of elements in a property
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @elem_size:	size of the individual element
 *
 * Search for a property in a device node and count the number of elements of
 * size elem_size in it.
 *
 * Return: The number of elements on sucess, -EINVAL if the property does not
 * exist or its length does not match a multiple of elem_size and -ENODATA if
 * the property does not have a value.
 */
int of_property_count_elems_of_size(const struct device_node *np,
				const char *propname, int elem_size)
{
	struct property *prop = of_find_property(np, propname, NULL);

	if (!prop)
		return -EINVAL;
	if (!prop->value)
		return -ENODATA;

	if (prop->length % elem_size != 0) {
		pr_err("size of %s in node %pOF is not a multiple of %d\n",
		       propname, np, elem_size);
		return -EINVAL;
	}

	return prop->length / elem_size;
}
EXPORT_SYMBOL_GPL(of_property_count_elems_of_size);

/**
 * of_find_property_value_of_size
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @min:	minimum allowed length of property value
 * @max:	maximum allowed length of property value (0 means unlimited)
 * @len:	if !=NULL, actual length is written to here
 *
 * Search for a property in a device node and valid the requested size.
 *
 * Return: The property value on success, -EINVAL if the property does not
 * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
 * property data is too small or too large.
 *
 */
static void *of_find_property_value_of_size(const struct device_node *np,
			const char *propname, u32 min, u32 max, size_t *len)
{
	struct property *prop = of_find_property(np, propname, NULL);

	if (!prop)
		return ERR_PTR(-EINVAL);
	if (!prop->value)
		return ERR_PTR(-ENODATA);
	if (prop->length < min)
		return ERR_PTR(-EOVERFLOW);
	if (max && prop->length > max)
		return ERR_PTR(-EOVERFLOW);

	if (len)
		*len = prop->length;

	return prop->value;
}

/**
 * of_property_read_u32_index - Find and read a u32 from a multi-value 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 u32 in the list of values
 * @out_value:	pointer to return value, modified only if no error.
 *
 * Search for a property in a device node and read nth 32-bit value from
 * it.
 *
 * Return: 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_value is modified only if a valid u32 value can be decoded.
 */
int of_property_read_u32_index(const struct device_node *np,
				       const char *propname,
				       u32 index, u32 *out_value)
{
	const u32 *val = of_find_property_value_of_size(np, propname,
					((index + 1) * sizeof(*out_value)),
					0,
					NULL);

	if (IS_ERR(val))
		return PTR_ERR(val);

	*out_value = be32_to_cpup(((__be32 *)val) + index);
	return 0;
}
EXPORT_SYMBOL_GPL(of_property_read_u32_index);

/**
 * of_property_read_u64_index - Find and read a u64 from a multi-value 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 u64 in the list of values
 * @out_value:	pointer to return value, modified only if no error.
 *
 * Search for a property in a device node and read nth 64-bit value from
 * it.
 *
 * Return: 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_value is modified only if a valid u64 value can be decoded.
 */
int of_property_read_u64_index(const struct device_node *np,
				       const char *propname,
				       u32 index, u64 *out_value)
{
	const u64 *val = of_find_property_value_of_size(np, propname,
					((index + 1) * sizeof(*out_value)),
					0, NULL);

	if (IS_ERR(val))
		return PTR_ERR(val);

	*out_value = be64_to_cpup(((__be64 *)val) + index);
	return 0;
}
EXPORT_SYMBOL_GPL(of_property_read_u64_index);

/**
 * of_property_read_variable_u8_array - Find and read an array of u8 from a
 * property, with bounds on the minimum and maximum array size.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to found values.
 * @sz_min:	minimum number of array elements to read
 * @sz_max:	maximum number of array elements to read, if zero there is no
 *		upper limit on the number of elements in the dts entry but only
 *		sz_min will be read.
 *
 * Search for a property in a device node and read 8-bit value(s) from
 * it.
 *
 * dts entry of array should be like:
 *  ``property = /bits/ 8 <0x50 0x60 0x70>;``
 *
 * Return: The number of elements read on success, -EINVAL if the property
 * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
 * if the property data is smaller than sz_min or longer than sz_max.
 *
 * The out_values is modified only if a valid u8 value can be decoded.
 */
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)
{
	size_t sz, count;
	const u8 *val = of_find_property_value_of_size(np, propname,
						(sz_min * sizeof(*out_values)),
						(sz_max * sizeof(*out_values)),
						&sz);

	if (IS_ERR(val))
		return PTR_ERR(val);

	if (!sz_max)
		sz = sz_min;
	else
		sz /= sizeof(*out_values);

	count = sz;
	while (count--)
		*out_values++ = *val++;

	return sz;
}
EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array);

/**
 * of_property_read_variable_u16_array - Find and read an array of u16 from a
 * property, with bounds on the minimum and maximum array size.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to found values.
 * @sz_min:	minimum number of array elements to read
 * @sz_max:	maximum number of array elements to read, if zero there is no
 *		upper limit on the number of elements in the dts entry but only
 *		sz_min will be read.
 *
 * Search for a property in a device node and read 16-bit value(s) from
 * it.
 *
 * dts entry of array should be like:
 *  ``property = /bits/ 16 <0x5000 0x6000 0x7000>;``
 *
 * Return: The number of elements read on success, -EINVAL if the property
 * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
 * if the property data is smaller than sz_min or longer than sz_max.
 *
 * The out_values is modified only if a valid u16 value can be decoded.
 */
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)
{
	size_t sz, count;
	const __be16 *val = of_find_property_value_of_size(np, propname,
						(sz_min * sizeof(*out_values)),
						(sz_max * sizeof(*out_values)),
						&sz);

	if (IS_ERR(val))
		return PTR_ERR(val);

	if (!sz_max)
		sz = sz_min;
	else
		sz /= sizeof(*out_values);

	count = sz;
	while (count--)
		*out_values++ = be16_to_cpup(val++);

	return sz;
}
EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array);

/**
 * of_property_read_variable_u32_array - Find and read an array of 32 bit
 * integers from a property, with bounds on the minimum and maximum array size.
 *
 * @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 found values.
 * @sz_min:	minimum number of array elements to read
 * @sz_max:	maximum number of array elements to read, if zero there is no
 *		upper limit on the number of elements in the dts entry but only
 *		sz_min will be read.
 *
 * Search for a property in a device node and read 32-bit value(s) from
 * it.
 *
 * Return: The number of elements read on success, -EINVAL if the property
 * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
 * if the property data is smaller than sz_min or longer than sz_max.
 *
 * The out_values is modified only if a valid u32 value can be decoded.
 */
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)
{
	size_t sz, count;
	const __be32 *val = of_find_property_value_of_size(np, propname,
						(sz_min * sizeof(*out_values)),
						(sz_max * sizeof(*out_values)),
						&sz);

	if (IS_ERR(val))
		return PTR_ERR(val);

	if (!sz_max)
		sz = sz_min;
	else
		sz /= sizeof(*out_values);

	count = sz;
	while (count--)
		*out_values++ = be32_to_cpup(val++);

	return sz;
}
EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array);

/**
 * of_property_read_u64 - Find and read a 64 bit integer from a property
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_value:	pointer to return value, modified only if return value is 0.
 *
 * Search for a property in a device node and read a 64-bit value from
 * it.
 *
 * Return: 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_value is modified only if a valid u64 value can be decoded.
 */
int of_property_read_u64(const struct device_node *np, const char *propname,
			 u64 *out_value)
{
	const __be32 *val = of_find_property_value_of_size(np, propname,
						sizeof(*out_value),
						0,
						NULL);

	if (IS_ERR(val))
		return PTR_ERR(val);

	*out_value = of_read_number(val, 2);
	return 0;
}
EXPORT_SYMBOL_GPL(of_property_read_u64);

/**
 * of_property_read_variable_u64_array - Find and read an array of 64 bit
 * integers from a property, with bounds on the minimum and maximum array size.
 *
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @out_values:	pointer to found values.
 * @sz_min:	minimum number of array elements to read
 * @sz_max:	maximum number of array elements to read, if zero there is no
 *		upper limit on the number of elements in the dts entry but only
 *		sz_min will be read.
 *
 * Search for a property in a device node and read 64-bit value(s) from
 * it.
 *
 * Return: The number of elements read on success, -EINVAL if the property
 * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
 * if the property data is smaller than sz_min or longer than sz_max.
 *
 * The out_values is modified only if a valid u64 value can be decoded.
 */
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)
{
	size_t sz, count;
	const __be32 *val = of_find_property_value_of_size(np, propname,
						(sz_min * sizeof(*out_values)),
						(sz_max * sizeof(*out_values)),
						&sz);

	if (IS_ERR(val))
		return PTR_ERR(val);

	if (!sz_max)
		sz = sz_min;
	else
		sz /= sizeof(*out_values);

	count = sz;
	while (count--) {
		*out_values++ = of_read_number(val, 2);
		val += 2;
	}

	return sz;
}
EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array);

/**
 * of_property_read_string - Find and read a string from a property
 * @np:		device node from which the property value is to be read.
 * @propname:	name of the property to be searched.
 * @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).
 *
 * Return: 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.
 *
 * Note that the empty string "" has length of 1, thus -ENODATA cannot
 * be interpreted as an empty string.
 *
 * The out_string pointer is modified only if a valid string can be decoded.
 */
int of_property_read_string(const struct device_node *np, const char *propname,
				const char **out_string)
{
	const struct property *prop = of_find_property(np, propname, NULL);
	if (!prop)
		return -EINVAL;
	if (!prop->length)
		return -ENODATA;
	if (strnlen(prop->value, prop->length) >= prop->length)
		return -EILSEQ;
	*out_string = prop->value;
	return 0;
}
EXPORT_SYMBOL_GPL(of_property_read_string);

/**
 * of_property_match_string() - Find string in a list and return index
 * @np: pointer to node containing string list property
 * @propname: string list property name
 * @string: pointer to string to search for in string list
 *
 * This function searches a string list property and returns the index
 * of a specific string value.
 */
int of_property_match_string(const struct device_node *np, const char *propname,
			     const char *string)
{
	const struct property *prop = of_find_property(np, propname, NULL);
	size_t l;
	int i;
	const char *p, *end;

	if (!prop)
		return -EINVAL;
	if (!prop->value)
		return -ENODATA;

	p = prop->value;
	end = p + prop->length;

	for (i = 0; p < end; i++, p += l) {
		l = strnlen(p, end - p) + 1;
		if (p + l > end)
			return -EILSEQ;
		pr_debug("comparing %s with %s\n", string, p);
		if (strcmp(string, p) == 0)
			return i; /* Found it; return index */
	}
	return -ENODATA;
}
EXPORT_SYMBOL_GPL(of_property_match_string);

/**
 * of_property_read_string_helper() - Utility helper for parsing string properties
 * @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.
 * @skip:	Number of strings to skip over at beginning of list.
 *
 * Don't call this function directly. It is a utility helper for the
 * of_property_read_string*() family of functions.
 */
int of_property_read_string_helper(const struct device_node *np,
				   const char *propname, const char **out_strs,
				   size_t sz, int skip)
{
	const struct property *prop = of_find_property(np, propname, NULL);
	int l = 0, i = 0;
	const char *p, *end;

	if (!prop)
		return -EINVAL;
	if (!prop->value)
		return -ENODATA;
	p = prop->value;
	end = p + prop->length;

	for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) {
		l = strnlen(p, end - p) + 1;
		if (p + l > end)
			return -EILSEQ;
		if (out_strs && i >= skip)
			*out_strs++ = p;
	}
	i -= skip;
	return i <= 0 ? -ENODATA : i;
}
EXPORT_SYMBOL_GPL(of_property_read_string_helper);

const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
			       u32 *pu)
{
	const void *curv = cur;

	if (!prop)
		return NULL;

	if (!cur) {
		curv = prop->value;
		goto out_val;
	}

	curv += sizeof(*cur);
	if (curv >= prop->value + prop->length)
		return NULL;

out_val:
	*pu = be32_to_cpup(curv);
	return curv;
}
EXPORT_SYMBOL_GPL(of_prop_next_u32);

const char *of_prop_next_string(struct property *prop, const char *cur)
{
	const void *curv = cur;

	if (!prop)
		return NULL;

	if (!cur)
		return prop->value;

	curv += strlen(cur) + 1;
	if (curv >= prop->value + prop->length)
		return NULL;

	return curv;
}
EXPORT_SYMBOL_GPL(of_prop_next_string);

/**
 * of_graph_parse_endpoint() - parse common endpoint node properties
 * @node: pointer to endpoint device_node
 * @endpoint: pointer to the OF endpoint data structure
 *
 * The caller should hold a reference to @node.
 */
int of_graph_parse_endpoint(const struct device_node *node,
			    struct of_endpoint *endpoint)
{
	struct device_node *port_node = of_get_parent(node);

	WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n",
		  __func__, node);

	memset(endpoint, 0, sizeof(*endpoint));

	endpoint->local_node = node;
	/*
	 * It doesn't matter whether the two calls below succeed.
	 * If they don't then the default value 0 is used.
	 */
	of_property_read_u32(port_node, "reg", &endpoint->port);
	of_property_read_u32(node, "reg", &endpoint->id);

	of_node_put(port_node);

	return 0;
}
EXPORT_SYMBOL(of_graph_parse_endpoint);

/**
 * of_graph_get_port_by_id() - get the port matching a given id
 * @parent: pointer to the parent device node
 * @id: id of the port
 *
 * Return: A 'port' node pointer with refcount incremented. The caller
 * has to use of_node_put() on it when done.
 */
struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
{
	struct device_node *node, *port;

	node = of_get_child_by_name(parent, "ports");
	if (node)
		parent = node;

	for_each_child_of_node(parent, port) {
		u32 port_id = 0;

		if (!of_node_name_eq(port, "port"))
			continue;
		of_property_read_u32(port, "reg", &port_id);
		if (id == port_id)
			break;
	}

	of_node_put(node);

	return port;
}
EXPORT_SYMBOL(of_graph_get_port_by_id);

/**
 * of_graph_get_next_endpoint() - get next endpoint node
 * @parent: pointer to the parent device node
 * @prev: previous endpoint node, or NULL to get first
 *
 * Return: An 'endpoint' node pointer with refcount incremented. Refcount
 * of the passed @prev node is decremented.
 */
struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
					struct device_node *prev)
{
	struct device_node *endpoint;
	struct device_node *port;

	if (!parent)
		return NULL;

	/*
	 * Start by locating the port node. If no previous endpoint is specified
	 * search for the first port node, otherwise get the previous endpoint
	 * parent port node.
	 */
	if (!prev) {
		struct device_node *node;

		node = of_get_child_by_name(parent, "ports");
		if (node)
			parent = node;

		port = of_get_child_by_name(parent, "port");
		of_node_put(node);

		if (!port) {
			pr_err("graph: no port node found in %pOF\n", parent);
			return NULL;
		}
	} else {
		port = of_get_parent(prev);
		if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n",
			      __func__, prev))
			return NULL;
	}

	while (1) {
		/*
		 * Now that we have a port node, get the next endpoint by
		 * getting the next child. If the previous endpoint is NULL this
		 * will return the first child.
		 */
		endpoint = of_get_next_child(port, prev);
		if (endpoint) {
			of_node_put(port);
			return endpoint;
		}

		/* No more endpoints under this port, try the next one. */
		prev = NULL;

		do {
			port = of_get_next_child(parent, port);
			if (!port)
				return NULL;
		} while (!of_node_name_eq(port, "port"));
	}
}
EXPORT_SYMBOL(of_graph_get_next_endpoint);

/**
 * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers
 * @parent: pointer to the parent device node
 * @port_reg: identifier (value of reg property) of the parent port node
 * @reg: identifier (value of reg property) of the endpoint node
 *
 * Return: An 'endpoint' node pointer which is identified by reg and at the same
 * is the child of a port node identified by port_reg. reg and port_reg are
 * ignored when they are -1. Use of_node_put() on the pointer when done.
 */
struct device_node *of_graph_get_endpoint_by_regs(
	const struct device_node *parent, int port_reg, int reg)
{
	struct of_endpoint endpoint;
	struct device_node *node = NULL;

	for_each_endpoint_of_node(parent, node) {
		of_graph_parse_endpoint(node, &endpoint);
		if (((port_reg == -1) || (endpoint.port == port_reg)) &&
			((reg == -1) || (endpoint.id == reg)))
			return node;
	}

	return NULL;
}
EXPORT_SYMBOL(of_graph_get_endpoint_by_regs);

/**
 * of_graph_get_remote_endpoint() - get remote endpoint node
 * @node: pointer to a local endpoint device_node
 *
 * Return: Remote endpoint node associated with remote endpoint node linked
 *	   to @node. Use of_node_put() on it when done.
 */
struct device_node *of_graph_get_remote_endpoint(const struct device_node *node)
{
	/* Get remote endpoint node. */
	return of_parse_phandle(node, "remote-endpoint", 0);
}
EXPORT_SYMBOL(of_graph_get_remote_endpoint);

/**
 * of_graph_get_port_parent() - get port's parent node
 * @node: pointer to a local endpoint device_node
 *
 * Return: device node associated with endpoint node linked
 *	   to @node. Use of_node_put() on it when done.
 */
struct device_node *of_graph_get_port_parent(struct device_node *node)
{
	unsigned int depth;

	if (!node)
		return NULL;

	/*
	 * Preserve usecount for passed in node as of_get_next_parent()
	 * will do of_node_put() on it.
	 */
	of_node_get(node);

	/* Walk 3 levels up only if there is 'ports' node. */
	for (depth = 3; depth && node; depth--) {
		node = of_get_next_parent(node);
		if (depth == 2 && !of_node_name_eq(node, "ports"))
			break;
	}
	return node;
}
EXPORT_SYMBOL(of_graph_get_port_parent);

/**
 * of_graph_get_remote_port_parent() - get remote port's parent node
 * @node: pointer to a local endpoint device_node
 *
 * Return: Remote device node associated with remote endpoint node linked
 *	   to @node. Use of_node_put() on it when done.
 */
struct device_node *of_graph_get_remote_port_parent(
			       const struct device_node *node)
{
	struct device_node *np, *pp;

	/* Get remote endpoint node. */
	np = of_graph_get_remote_endpoint(node);

	pp = of_graph_get_port_parent(np);

	of_node_put(np);

	return pp;
}
EXPORT_SYMBOL(of_graph_get_remote_port_parent);

/**
 * of_graph_get_remote_port() - get remote port node
 * @node: pointer to a local endpoint device_node
 *
 * Return: Remote port node associated with remote endpoint node linked
 * to @node. Use of_node_put() on it when done.
 */
struct device_node *of_graph_get_remote_port(const struct device_node *node)
{
	struct device_node *np;

	/* Get remote endpoint node. */
	np = of_graph_get_remote_endpoint(node);
	if (!np)
		return NULL;
	return of_get_next_parent(np);
}
EXPORT_SYMBOL(of_graph_get_remote_port);

int of_graph_get_endpoint_count(const struct device_node *np)
{
	struct device_node *endpoint;
	int num = 0;

	for_each_endpoint_of_node(np, endpoint)
		num++;

	return num;
}
EXPORT_SYMBOL(of_graph_get_endpoint_count);

/**
 * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
 * @node: pointer to parent device_node containing graph port/endpoint
 * @port: identifier (value of reg property) of the parent port node
 * @endpoint: identifier (value of reg property) of the endpoint node
 *
 * Return: Remote device node associated with remote endpoint node linked
 * to @node. Use of_node_put() on it when done.
 */
struct device_node *of_graph_get_remote_node(const struct device_node *node,
					     u32 port, u32 endpoint)
{
	struct device_node *endpoint_node, *remote;

	endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
	if (!endpoint_node) {
		pr_debug("no valid endpoint (%d, %d) for node %pOF\n",
			 port, endpoint, node);
		return NULL;
	}

	remote = of_graph_get_remote_port_parent(endpoint_node);
	of_node_put(endpoint_node);
	if (!remote) {
		pr_debug("no valid remote node\n");
		return NULL;
	}

	if (!of_device_is_available(remote)) {
		pr_debug("not available for remote node\n");
		of_node_put(remote);
		return NULL;
	}

	return remote;
}
EXPORT_SYMBOL(of_graph_get_remote_node);

static struct fwnode_handle *of_fwnode_get(struct fwnode_handle *fwnode)
{
	return of_fwnode_handle(of_node_get(to_of_node(fwnode)));
}

static void of_fwnode_put(struct fwnode_handle *fwnode)
{
	of_node_put(to_of_node(fwnode));
}

static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode)
{
	return of_device_is_available(to_of_node(fwnode));
}

static bool of_fwnode_device_dma_supported(const struct fwnode_handle *fwnode)
{
	return true;
}

static enum dev_dma_attr
of_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode)
{
	if (of_dma_is_coherent(to_of_node(fwnode)))
		return DEV_DMA_COHERENT;
	else
		return DEV_DMA_NON_COHERENT;
}

static bool of_fwnode_property_present(const struct fwnode_handle *fwnode,
				       const char *propname)
{
	return of_property_read_bool(to_of_node(fwnode), propname);
}

static int of_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
					     const char *propname,
					     unsigned int elem_size, void *val,
					     size_t nval)
{
	const struct device_node *node = to_of_node(fwnode);

	if (!val)
		return of_property_count_elems_of_size(node, propname,
						       elem_size);

	switch (elem_size) {
	case sizeof(u8):
		return of_property_read_u8_array(node, propname, val, nval);
	case sizeof(u16):
		return of_property_read_u16_array(node, propname, val, nval);
	case sizeof(u32):
		return of_property_read_u32_array(node, propname, val, nval);
	case sizeof(u64):
		return of_property_read_u64_array(node, propname, val, nval);
	}

	return -ENXIO;
}

static int
of_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
				     const char *propname, const char **val,
				     size_t nval)
{
	const struct device_node *node = to_of_node(fwnode);

	return val ?
		of_property_read_string_array(node, propname, val, nval) :
		of_property_count_strings(node, propname);
}

static const char *of_fwnode_get_name(const struct fwnode_handle *fwnode)
{
	return kbasename(to_of_node(fwnode)->full_name);
}

static const char *of_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
{
	/* Root needs no prefix here (its name is "/"). */
	if (!to_of_node(fwnode)->parent)
		return "";

	return "/";
}

static struct fwnode_handle *
of_fwnode_get_parent(const struct fwnode_handle *fwnode)
{
	return of_fwnode_handle(of_get_parent(to_of_node(fwnode)));
}

static struct fwnode_handle *
of_fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
			      struct fwnode_handle *child)
{
	return of_fwnode_handle(of_get_next_available_child(to_of_node(fwnode),
							    to_of_node(child)));
}

static struct fwnode_handle *
of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
			       const char *childname)
{
	const struct device_node *node = to_of_node(fwnode);
	struct device_node *child;

	for_each_available_child_of_node(node, child)
		if (of_node_name_eq(child, childname))
			return of_fwnode_handle(child);

	return NULL;
}

static int
of_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
			     const char *prop, const char *nargs_prop,
			     unsigned int nargs, unsigned int index,
			     struct fwnode_reference_args *args)
{
	struct of_phandle_args of_args;
	unsigned int i;
	int ret;

	if (nargs_prop)
		ret = of_parse_phandle_with_args(to_of_node(fwnode), prop,
						 nargs_prop, index, &of_args);
	else
		ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), prop,
						       nargs, index, &of_args);
	if (ret < 0)
		return ret;
	if (!args) {
		of_node_put(of_args.np);
		return 0;
	}

	args->nargs = of_args.args_count;
	args->fwnode = of_fwnode_handle(of_args.np);

	for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
		args->args[i] = i < of_args.args_count ? of_args.args[i] : 0;

	return 0;
}

static struct fwnode_handle *
of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
				  struct fwnode_handle *prev)
{
	return of_fwnode_handle(of_graph_get_next_endpoint(to_of_node(fwnode),
							   to_of_node(prev)));
}

static struct fwnode_handle *
of_fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
{
	return of_fwnode_handle(
		of_graph_get_remote_endpoint(to_of_node(fwnode)));
}

static struct fwnode_handle *
of_fwnode_graph_get_port_parent(struct fwnode_handle *fwnode)
{
	struct device_node *np;

	/* Get the parent of the port */
	np = of_get_parent(to_of_node(fwnode));
	if (!np)
		return NULL;

	/* Is this the "ports" node? If not, it's the port parent. */
	if (!of_node_name_eq(np, "ports"))
		return of_fwnode_handle(np);

	return of_fwnode_handle(of_get_next_parent(np));
}

static int of_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
					  struct fwnode_endpoint *endpoint)
{
	const struct device_node *node = to_of_node(fwnode);
	struct device_node *port_node = of_get_parent(node);

	endpoint->local_fwnode = fwnode;

	of_property_read_u32(port_node, "reg", &endpoint->port);
	of_property_read_u32(node, "reg", &endpoint->id);

	of_node_put(port_node);

	return 0;
}

static const void *
of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
				const struct device *dev)
{
	return of_device_get_match_data(dev);
}

static bool of_is_ancestor_of(struct device_node *test_ancestor,
			      struct device_node *child)
{
	of_node_get(child);
	while (child) {
		if (child == test_ancestor) {
			of_node_put(child);
			return true;
		}
		child = of_get_next_parent(child);
	}
	return false;
}

static struct device_node *of_get_compat_node(struct device_node *np)
{
	of_node_get(np);

	while (np) {
		if (!of_device_is_available(np)) {
			of_node_put(np);
			np = NULL;
		}

		if (of_find_property(np, "compatible", NULL))
			break;

		np = of_get_next_parent(np);
	}

	return np;
}

static struct device_node *of_get_compat_node_parent(struct device_node *np)
{
	struct device_node *parent, *node;

	parent = of_get_parent(np);
	node = of_get_compat_node(parent);
	of_node_put(parent);

	return node;
}

/**
 * of_link_to_phandle - Add fwnode link to supplier from supplier phandle
 * @con_np: consumer device tree node
 * @sup_np: supplier device tree node
 *
 * Given a phandle to a supplier device tree node (@sup_np), this function
 * finds the device that owns the supplier device tree node and creates a
 * device link from @dev consumer device to the supplier device. This function
 * doesn't create device links for invalid scenarios such as trying to create a
 * link with a parent device as the consumer of its child device. In such
 * cases, it returns an error.
 *
 * Returns:
 * - 0 if fwnode link successfully created to supplier
 * - -EINVAL if the supplier link is invalid and should not be created
 * - -ENODEV if struct device will never be create for supplier
 */
static int of_link_to_phandle(struct device_node *con_np,
			      struct device_node *sup_np)
{
	struct device *sup_dev;
	struct device_node *tmp_np = sup_np;

	/*
	 * Find the device node that contains the supplier phandle.  It may be
	 * @sup_np or it may be an ancestor of @sup_np.
	 */
	sup_np = of_get_compat_node(sup_np);
	if (!sup_np) {
		pr_debug("Not linking %pOFP to %pOFP - No device\n",
			 con_np, tmp_np);
		return -ENODEV;
	}

	/*
	 * Don't allow linking a device node as a consumer of one of its
	 * descendant nodes. By definition, a child node can't be a functional
	 * dependency for the parent node.
	 */
	if (of_is_ancestor_of(con_np, sup_np)) {
		pr_debug("Not linking %pOFP to %pOFP - is descendant\n",
			 con_np, sup_np);
		of_node_put(sup_np);
		return -EINVAL;
	}

	/*
	 * Don't create links to "early devices" that won't have struct devices
	 * created for them.
	 */
	sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
	if (!sup_dev &&
	    (of_node_check_flag(sup_np, OF_POPULATED) ||
	     sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) {
		pr_debug("Not linking %pOFP to %pOFP - No struct device\n",
			 con_np, sup_np);
		of_node_put(sup_np);
		return -ENODEV;
	}
	put_device(sup_dev);

	fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np));
	of_node_put(sup_np);

	return 0;
}

/**
 * parse_prop_cells - Property parsing function for suppliers
 *
 * @np:		Pointer to device tree node containing a list
 * @prop_name:	Name of property to be parsed. Expected to hold phandle values
 * @index:	For properties holding a list of phandles, this is the index
 *		into the list.
 * @list_name:	Property name that is known to contain list of phandle(s) to
 *		supplier(s)
 * @cells_name:	property name that specifies phandles' arguments count
 *
 * This is a helper function to parse properties that have a known fixed name
 * and are a list of phandles and phandle arguments.
 *
 * Returns:
 * - phandle node pointer with refcount incremented. Caller must of_node_put()
 *   on it when done.
 * - NULL if no phandle found at index
 */
static struct device_node *parse_prop_cells(struct device_node *np,
					    const char *prop_name, int index,
					    const char *list_name,
					    const char *cells_name)
{
	struct of_phandle_args sup_args;

	if (strcmp(prop_name, list_name))
		return NULL;

	if (of_parse_phandle_with_args(np, list_name, cells_name, index,
				       &sup_args))
		return NULL;

	return sup_args.np;
}

#define DEFINE_SIMPLE_PROP(fname, name, cells)				  \
static struct device_node *parse_##fname(struct device_node *np,	  \
					const char *prop_name, int index) \
{									  \
	return parse_prop_cells(np, prop_name, index, name, cells);	  \
}

static int strcmp_suffix(const char *str, const char *suffix)
{
	unsigned int len, suffix_len;

	len = strlen(str);
	suffix_len = strlen(suffix);
	if (len <= suffix_len)
		return -1;
	return strcmp(str + len - suffix_len, suffix);
}

/**
 * parse_suffix_prop_cells - Suffix property parsing function for suppliers
 *
 * @np:		Pointer to device tree node containing a list
 * @prop_name:	Name of property to be parsed. Expected to hold phandle values
 * @index:	For properties holding a list of phandles, this is the index
 *		into the list.
 * @suffix:	Property suffix that is known to contain list of phandle(s) to
 *		supplier(s)
 * @cells_name:	property name that specifies phandles' arguments count
 *
 * This is a helper function to parse properties that have a known fixed suffix
 * and are a list of phandles and phandle arguments.
 *
 * Returns:
 * - phandle node pointer with refcount incremented. Caller must of_node_put()
 *   on it when done.
 * - NULL if no phandle found at index
 */
static struct device_node *parse_suffix_prop_cells(struct device_node *np,
					    const char *prop_name, int index,
					    const char *suffix,
					    const char *cells_name)
{
	struct of_phandle_args sup_args;

	if (strcmp_suffix(prop_name, suffix))
		return NULL;

	if (of_parse_phandle_with_args(np, prop_name, cells_name, index,
				       &sup_args))
		return NULL;

	return sup_args.np;
}

#define DEFINE_SUFFIX_PROP(fname, suffix, cells)			     \
static struct device_node *parse_##fname(struct device_node *np,	     \
					const char *prop_name, int index)    \
{									     \
	return parse_suffix_prop_cells(np, prop_name, index, suffix, cells); \
}

/**
 * struct supplier_bindings - Property parsing functions for suppliers
 *
 * @parse_prop: function name
 *	parse_prop() finds the node corresponding to a supplier phandle
 * @parse_prop.np: Pointer to device node holding supplier phandle property
 * @parse_prop.prop_name: Name of property holding a phandle value
 * @parse_prop.index: For properties holding a list of phandles, this is the
 *		      index into the list
 * @optional: Describes whether a supplier is mandatory or not
 * @node_not_dev: The consumer node containing the property is never converted
 *		  to a struct device. Instead, parse ancestor nodes for the
 *		  compatible property to find a node corresponding to a device.
 *
 * Returns:
 * parse_prop() return values are
 * - phandle node pointer with refcount incremented. Caller must of_node_put()
 *   on it when done.
 * - NULL if no phandle found at index
 */
struct supplier_bindings {
	struct device_node *(*parse_prop)(struct device_node *np,
					  const char *prop_name, int index);
	bool optional;
	bool node_not_dev;
};

DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells")
DEFINE_SIMPLE_PROP(interconnects, "interconnects", "#interconnect-cells")
DEFINE_SIMPLE_PROP(iommus, "iommus", "#iommu-cells")
DEFINE_SIMPLE_PROP(mboxes, "mboxes", "#mbox-cells")
DEFINE_SIMPLE_PROP(io_channels, "io-channel", "#io-channel-cells")
DEFINE_SIMPLE_PROP(interrupt_parent, "interrupt-parent", NULL)
DEFINE_SIMPLE_PROP(dmas, "dmas", "#dma-cells")
DEFINE_SIMPLE_PROP(power_domains, "power-domains", "#power-domain-cells")
DEFINE_SIMPLE_PROP(hwlocks, "hwlocks", "#hwlock-cells")
DEFINE_SIMPLE_PROP(extcon, "extcon", NULL)
DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells", NULL)
DEFINE_SIMPLE_PROP(phys, "phys", "#phy-cells")
DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent", NULL)
DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL)
DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1", NULL)
DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2", NULL)
DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3", NULL)
DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4", NULL)
DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5", NULL)
DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6", NULL)
DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL)
DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL)
DEFINE_SIMPLE_PROP(remote_endpoint, "remote-endpoint", NULL)
DEFINE_SIMPLE_PROP(pwms, "pwms", "#pwm-cells")
DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells")
DEFINE_SIMPLE_PROP(leds, "leds", NULL)
DEFINE_SIMPLE_PROP(backlight, "backlight", NULL)
DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")

static struct device_node *parse_gpios(struct device_node *np,
				       const char *prop_name, int index)
{
	if (!strcmp_suffix(prop_name, ",nr-gpios"))
		return NULL;

	return parse_suffix_prop_cells(np, prop_name, index, "-gpios",
				       "#gpio-cells");
}

static struct device_node *parse_iommu_maps(struct device_node *np,
					    const char *prop_name, int index)
{
	if (strcmp(prop_name, "iommu-map"))
		return NULL;

	return of_parse_phandle(np, prop_name, (index * 4) + 1);
}

static struct device_node *parse_gpio_compat(struct device_node *np,
					     const char *prop_name, int index)
{
	struct of_phandle_args sup_args;

	if (strcmp(prop_name, "gpio") && strcmp(prop_name, "gpios"))
		return NULL;

	/*
	 * Ignore node with gpio-hog property since its gpios are all provided
	 * by its parent.
	 */
	if (of_find_property(np, "gpio-hog", NULL))
		return NULL;

	if (of_parse_phandle_with_args(np, prop_name, "#gpio-cells", index,
				       &sup_args))
		return NULL;

	return sup_args.np;
}

static struct device_node *parse_interrupts(struct device_node *np,
					    const char *prop_name, int index)
{
	struct of_phandle_args sup_args;

	if (!IS_ENABLED(CONFIG_OF_IRQ) || IS_ENABLED(CONFIG_PPC))
		return NULL;

	if (strcmp(prop_name, "interrupts") &&
	    strcmp(prop_name, "interrupts-extended"))
		return NULL;

	return of_irq_parse_one(np, index, &sup_args) ? NULL : sup_args.np;
}

static const struct supplier_bindings of_supplier_bindings[] = {
	{ .parse_prop = parse_clocks, },
	{ .parse_prop = parse_interconnects, },
	{ .parse_prop = parse_iommus, .optional = true, },
	{ .parse_prop = parse_iommu_maps, .optional = true, },
	{ .parse_prop = parse_mboxes, },
	{ .parse_prop = parse_io_channels, },
	{ .parse_prop = parse_interrupt_parent, },
	{ .parse_prop = parse_dmas, .optional = true, },
	{ .parse_prop = parse_power_domains, },
	{ .parse_prop = parse_hwlocks, },
	{ .parse_prop = parse_extcon, },
	{ .parse_prop = parse_nvmem_cells, },
	{ .parse_prop = parse_phys, },
	{ .parse_prop = parse_wakeup_parent, },
	{ .parse_prop = parse_pinctrl0, },
	{ .parse_prop = parse_pinctrl1, },
	{ .parse_prop = parse_pinctrl2, },
	{ .parse_prop = parse_pinctrl3, },
	{ .parse_prop = parse_pinctrl4, },
	{ .parse_prop = parse_pinctrl5, },
	{ .parse_prop = parse_pinctrl6, },
	{ .parse_prop = parse_pinctrl7, },
	{ .parse_prop = parse_pinctrl8, },
	{ .parse_prop = parse_remote_endpoint, .node_not_dev = true, },
	{ .parse_prop = parse_pwms, },
	{ .parse_prop = parse_resets, },
	{ .parse_prop = parse_leds, },
	{ .parse_prop = parse_backlight, },
	{ .parse_prop = parse_gpio_compat, },
	{ .parse_prop = parse_interrupts, },
	{ .parse_prop = parse_regulators, },
	{ .parse_prop = parse_gpio, },
	{ .parse_prop = parse_gpios, },
	{}
};

/**
 * of_link_property - Create device links to suppliers listed in a property
 * @con_np: The consumer device tree node which contains the property
 * @prop_name: Name of property to be parsed
 *
 * This function checks if the property @prop_name that is present in the
 * @con_np device tree node is one of the known common device tree bindings
 * that list phandles to suppliers. If @prop_name isn't one, this function
 * doesn't do anything.
 *
 * If @prop_name is one, this function attempts to create fwnode links from the
 * consumer device tree node @con_np to all the suppliers device tree nodes
 * listed in @prop_name.
 *
 * Any failed attempt to create a fwnode link will NOT result in an immediate
 * return.  of_link_property() must create links to all the available supplier
 * device tree nodes even when attempts to create a link to one or more
 * suppliers fail.
 */
static int of_link_property(struct device_node *con_np, const char *prop_name)
{
	struct device_node *phandle;
	const struct supplier_bindings *s = of_supplier_bindings;
	unsigned int i = 0;
	bool matched = false;

	/* Do not stop at first failed link, link all available suppliers. */
	while (!matched && s->parse_prop) {
		if (s->optional && !fw_devlink_is_strict()) {
			s++;
			continue;
		}

		while ((phandle = s->parse_prop(con_np, prop_name, i))) {
			struct device_node *con_dev_np;

			con_dev_np = s->node_not_dev
					? of_get_compat_node_parent(con_np)
					: of_node_get(con_np);
			matched = true;
			i++;
			of_link_to_phandle(con_dev_np, phandle);
			of_node_put(phandle);
			of_node_put(con_dev_np);
		}
		s++;
	}
	return 0;
}

static void __iomem *of_fwnode_iomap(struct fwnode_handle *fwnode, int index)
{
#ifdef CONFIG_OF_ADDRESS
	return of_iomap(to_of_node(fwnode), index);
#else
	return NULL;
#endif
}

static int of_fwnode_irq_get(const struct fwnode_handle *fwnode,
			     unsigned int index)
{
	return of_irq_get(to_of_node(fwnode), index);
}

static int of_fwnode_add_links(struct fwnode_handle *fwnode)
{
	struct property *p;
	struct device_node *con_np = to_of_node(fwnode);

	if (IS_ENABLED(CONFIG_X86))
		return 0;

	if (!con_np)
		return -EINVAL;

	for_each_property_of_node(con_np, p)
		of_link_property(con_np, p->name);

	return 0;
}

const struct fwnode_operations of_fwnode_ops = {
	.get = of_fwnode_get,
	.put = of_fwnode_put,
	.device_is_available = of_fwnode_device_is_available,
	.device_get_match_data = of_fwnode_device_get_match_data,
	.device_dma_supported = of_fwnode_device_dma_supported,
	.device_get_dma_attr = of_fwnode_device_get_dma_attr,
	.property_present = of_fwnode_property_present,
	.property_read_int_array = of_fwnode_property_read_int_array,
	.property_read_string_array = of_fwnode_property_read_string_array,
	.get_name = of_fwnode_get_name,
	.get_name_prefix = of_fwnode_get_name_prefix,
	.get_parent = of_fwnode_get_parent,
	.get_next_child_node = of_fwnode_get_next_child_node,
	.get_named_child_node = of_fwnode_get_named_child_node,
	.get_reference_args = of_fwnode_get_reference_args,
	.graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint,
	.graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint,
	.graph_get_port_parent = of_fwnode_graph_get_port_parent,
	.graph_parse_endpoint = of_fwnode_graph_parse_endpoint,
	.iomap = of_fwnode_iomap,
	.irq_get = of_fwnode_irq_get,
	.add_links = of_fwnode_add_links,
};
EXPORT_SYMBOL_GPL(of_fwnode_ops);