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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OF helpers for regulator framework
4 *
5 * Copyright (C) 2011 Texas Instruments, Inc.
6 * Rajendra Nayak <rnayak@ti.com>
7 */
8
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/of.h>
12#include <linux/regulator/machine.h>
13#include <linux/regulator/driver.h>
14#include <linux/regulator/of_regulator.h>
15
16#include "internal.h"
17
18static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
19 [PM_SUSPEND_STANDBY] = "regulator-state-standby",
20 [PM_SUSPEND_MEM] = "regulator-state-mem",
21 [PM_SUSPEND_MAX] = "regulator-state-disk",
22};
23
24static int of_get_regulation_constraints(struct device *dev,
25 struct device_node *np,
26 struct regulator_init_data **init_data,
27 const struct regulator_desc *desc)
28{
29 struct regulation_constraints *constraints = &(*init_data)->constraints;
30 struct regulator_state *suspend_state;
31 struct device_node *suspend_np;
32 unsigned int mode;
33 int ret, i, len;
34 int n_phandles;
35 u32 pval;
36
37 n_phandles = of_count_phandle_with_args(np, "regulator-coupled-with",
38 NULL);
39 n_phandles = max(n_phandles, 0);
40
41 constraints->name = of_get_property(np, "regulator-name", NULL);
42
43 if (!of_property_read_u32(np, "regulator-min-microvolt", &pval))
44 constraints->min_uV = pval;
45
46 if (!of_property_read_u32(np, "regulator-max-microvolt", &pval))
47 constraints->max_uV = pval;
48
49 /* Voltage change possible? */
50 if (constraints->min_uV != constraints->max_uV)
51 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
52
53 /* Do we have a voltage range, if so try to apply it? */
54 if (constraints->min_uV && constraints->max_uV)
55 constraints->apply_uV = true;
56
57 if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
58 constraints->uV_offset = pval;
59 if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
60 constraints->min_uA = pval;
61 if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
62 constraints->max_uA = pval;
63
64 if (!of_property_read_u32(np, "regulator-input-current-limit-microamp",
65 &pval))
66 constraints->ilim_uA = pval;
67
68 /* Current change possible? */
69 if (constraints->min_uA != constraints->max_uA)
70 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
71
72 constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
73 constraints->always_on = of_property_read_bool(np, "regulator-always-on");
74 if (!constraints->always_on) /* status change should be possible. */
75 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
76
77 constraints->pull_down = of_property_read_bool(np, "regulator-pull-down");
78
79 if (of_property_read_bool(np, "regulator-allow-bypass"))
80 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
81
82 if (of_property_read_bool(np, "regulator-allow-set-load"))
83 constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
84
85 ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
86 if (!ret) {
87 if (pval)
88 constraints->ramp_delay = pval;
89 else
90 constraints->ramp_disable = true;
91 }
92
93 ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);
94 if (!ret)
95 constraints->settling_time = pval;
96
97 ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval);
98 if (!ret)
99 constraints->settling_time_up = pval;
100 if (constraints->settling_time_up && constraints->settling_time) {
101 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n",
102 np);
103 constraints->settling_time_up = 0;
104 }
105
106 ret = of_property_read_u32(np, "regulator-settling-time-down-us",
107 &pval);
108 if (!ret)
109 constraints->settling_time_down = pval;
110 if (constraints->settling_time_down && constraints->settling_time) {
111 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n",
112 np);
113 constraints->settling_time_down = 0;
114 }
115
116 ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
117 if (!ret)
118 constraints->enable_time = pval;
119
120 constraints->soft_start = of_property_read_bool(np,
121 "regulator-soft-start");
122 ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
123 if (!ret) {
124 constraints->active_discharge =
125 (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
126 REGULATOR_ACTIVE_DISCHARGE_DISABLE;
127 }
128
129 if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
130 if (desc && desc->of_map_mode) {
131 mode = desc->of_map_mode(pval);
132 if (mode == REGULATOR_MODE_INVALID)
133 pr_err("%pOFn: invalid mode %u\n", np, pval);
134 else
135 constraints->initial_mode = mode;
136 } else {
137 pr_warn("%pOFn: mapping for mode %d not defined\n",
138 np, pval);
139 }
140 }
141
142 len = of_property_count_elems_of_size(np, "regulator-allowed-modes",
143 sizeof(u32));
144 if (len > 0) {
145 if (desc && desc->of_map_mode) {
146 for (i = 0; i < len; i++) {
147 ret = of_property_read_u32_index(np,
148 "regulator-allowed-modes", i, &pval);
149 if (ret) {
150 pr_err("%pOFn: couldn't read allowed modes index %d, ret=%d\n",
151 np, i, ret);
152 break;
153 }
154 mode = desc->of_map_mode(pval);
155 if (mode == REGULATOR_MODE_INVALID)
156 pr_err("%pOFn: invalid regulator-allowed-modes element %u\n",
157 np, pval);
158 else
159 constraints->valid_modes_mask |= mode;
160 }
161 if (constraints->valid_modes_mask)
162 constraints->valid_ops_mask
163 |= REGULATOR_CHANGE_MODE;
164 } else {
165 pr_warn("%pOFn: mode mapping not defined\n", np);
166 }
167 }
168
169 if (!of_property_read_u32(np, "regulator-system-load", &pval))
170 constraints->system_load = pval;
171
172 if (n_phandles) {
173 constraints->max_spread = devm_kzalloc(dev,
174 sizeof(*constraints->max_spread) * n_phandles,
175 GFP_KERNEL);
176
177 if (!constraints->max_spread)
178 return -ENOMEM;
179
180 of_property_read_u32_array(np, "regulator-coupled-max-spread",
181 constraints->max_spread, n_phandles);
182 }
183
184 if (!of_property_read_u32(np, "regulator-max-step-microvolt",
185 &pval))
186 constraints->max_uV_step = pval;
187
188 constraints->over_current_protection = of_property_read_bool(np,
189 "regulator-over-current-protection");
190
191 for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
192 switch (i) {
193 case PM_SUSPEND_MEM:
194 suspend_state = &constraints->state_mem;
195 break;
196 case PM_SUSPEND_MAX:
197 suspend_state = &constraints->state_disk;
198 break;
199 case PM_SUSPEND_STANDBY:
200 suspend_state = &constraints->state_standby;
201 break;
202 case PM_SUSPEND_ON:
203 case PM_SUSPEND_TO_IDLE:
204 default:
205 continue;
206 }
207
208 suspend_np = of_get_child_by_name(np, regulator_states[i]);
209 if (!suspend_np || !suspend_state)
210 continue;
211
212 if (!of_property_read_u32(suspend_np, "regulator-mode",
213 &pval)) {
214 if (desc && desc->of_map_mode) {
215 mode = desc->of_map_mode(pval);
216 if (mode == REGULATOR_MODE_INVALID)
217 pr_err("%pOFn: invalid mode %u\n",
218 np, pval);
219 else
220 suspend_state->mode = mode;
221 } else {
222 pr_warn("%pOFn: mapping for mode %d not defined\n",
223 np, pval);
224 }
225 }
226
227 if (of_property_read_bool(suspend_np,
228 "regulator-on-in-suspend"))
229 suspend_state->enabled = ENABLE_IN_SUSPEND;
230 else if (of_property_read_bool(suspend_np,
231 "regulator-off-in-suspend"))
232 suspend_state->enabled = DISABLE_IN_SUSPEND;
233
234 if (!of_property_read_u32(suspend_np,
235 "regulator-suspend-min-microvolt", &pval))
236 suspend_state->min_uV = pval;
237
238 if (!of_property_read_u32(suspend_np,
239 "regulator-suspend-max-microvolt", &pval))
240 suspend_state->max_uV = pval;
241
242 if (!of_property_read_u32(suspend_np,
243 "regulator-suspend-microvolt", &pval))
244 suspend_state->uV = pval;
245 else /* otherwise use min_uV as default suspend voltage */
246 suspend_state->uV = suspend_state->min_uV;
247
248 if (of_property_read_bool(suspend_np,
249 "regulator-changeable-in-suspend"))
250 suspend_state->changeable = true;
251
252 if (i == PM_SUSPEND_MEM)
253 constraints->initial_state = PM_SUSPEND_MEM;
254
255 of_node_put(suspend_np);
256 suspend_state = NULL;
257 suspend_np = NULL;
258 }
259
260 return 0;
261}
262
263/**
264 * of_get_regulator_init_data - extract regulator_init_data structure info
265 * @dev: device requesting for regulator_init_data
266 * @node: regulator device node
267 * @desc: regulator description
268 *
269 * Populates regulator_init_data structure by extracting data from device
270 * tree node, returns a pointer to the populated structure or NULL if memory
271 * alloc fails.
272 */
273struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
274 struct device_node *node,
275 const struct regulator_desc *desc)
276{
277 struct regulator_init_data *init_data;
278
279 if (!node)
280 return NULL;
281
282 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
283 if (!init_data)
284 return NULL; /* Out of memory? */
285
286 if (of_get_regulation_constraints(dev, node, &init_data, desc))
287 return NULL;
288
289 return init_data;
290}
291EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
292
293struct devm_of_regulator_matches {
294 struct of_regulator_match *matches;
295 unsigned int num_matches;
296};
297
298static void devm_of_regulator_put_matches(struct device *dev, void *res)
299{
300 struct devm_of_regulator_matches *devm_matches = res;
301 int i;
302
303 for (i = 0; i < devm_matches->num_matches; i++)
304 of_node_put(devm_matches->matches[i].of_node);
305}
306
307/**
308 * of_regulator_match - extract multiple regulator init data from device tree.
309 * @dev: device requesting the data
310 * @node: parent device node of the regulators
311 * @matches: match table for the regulators
312 * @num_matches: number of entries in match table
313 *
314 * This function uses a match table specified by the regulator driver to
315 * parse regulator init data from the device tree. @node is expected to
316 * contain a set of child nodes, each providing the init data for one
317 * regulator. The data parsed from a child node will be matched to a regulator
318 * based on either the deprecated property regulator-compatible if present,
319 * or otherwise the child node's name. Note that the match table is modified
320 * in place and an additional of_node reference is taken for each matched
321 * regulator.
322 *
323 * Returns the number of matches found or a negative error code on failure.
324 */
325int of_regulator_match(struct device *dev, struct device_node *node,
326 struct of_regulator_match *matches,
327 unsigned int num_matches)
328{
329 unsigned int count = 0;
330 unsigned int i;
331 const char *name;
332 struct device_node *child;
333 struct devm_of_regulator_matches *devm_matches;
334
335 if (!dev || !node)
336 return -EINVAL;
337
338 devm_matches = devres_alloc(devm_of_regulator_put_matches,
339 sizeof(struct devm_of_regulator_matches),
340 GFP_KERNEL);
341 if (!devm_matches)
342 return -ENOMEM;
343
344 devm_matches->matches = matches;
345 devm_matches->num_matches = num_matches;
346
347 devres_add(dev, devm_matches);
348
349 for (i = 0; i < num_matches; i++) {
350 struct of_regulator_match *match = &matches[i];
351 match->init_data = NULL;
352 match->of_node = NULL;
353 }
354
355 for_each_child_of_node(node, child) {
356 name = of_get_property(child,
357 "regulator-compatible", NULL);
358 if (!name)
359 name = child->name;
360 for (i = 0; i < num_matches; i++) {
361 struct of_regulator_match *match = &matches[i];
362 if (match->of_node)
363 continue;
364
365 if (strcmp(match->name, name))
366 continue;
367
368 match->init_data =
369 of_get_regulator_init_data(dev, child,
370 match->desc);
371 if (!match->init_data) {
372 dev_err(dev,
373 "failed to parse DT for regulator %pOFn\n",
374 child);
375 of_node_put(child);
376 return -EINVAL;
377 }
378 match->of_node = of_node_get(child);
379 count++;
380 break;
381 }
382 }
383
384 return count;
385}
386EXPORT_SYMBOL_GPL(of_regulator_match);
387
388static struct
389device_node *regulator_of_get_init_node(struct device *dev,
390 const struct regulator_desc *desc)
391{
392 struct device_node *search, *child;
393 const char *name;
394
395 if (!dev->of_node || !desc->of_match)
396 return NULL;
397
398 if (desc->regulators_node) {
399 search = of_get_child_by_name(dev->of_node,
400 desc->regulators_node);
401 } else {
402 search = of_node_get(dev->of_node);
403
404 if (!strcmp(desc->of_match, search->name))
405 return search;
406 }
407
408 if (!search) {
409 dev_dbg(dev, "Failed to find regulator container node '%s'\n",
410 desc->regulators_node);
411 return NULL;
412 }
413
414 for_each_available_child_of_node(search, child) {
415 name = of_get_property(child, "regulator-compatible", NULL);
416 if (!name)
417 name = child->name;
418
419 if (!strcmp(desc->of_match, name)) {
420 of_node_put(search);
421 return of_node_get(child);
422 }
423 }
424
425 of_node_put(search);
426
427 return NULL;
428}
429
430struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
431 const struct regulator_desc *desc,
432 struct regulator_config *config,
433 struct device_node **node)
434{
435 struct device_node *child;
436 struct regulator_init_data *init_data = NULL;
437
438 child = regulator_of_get_init_node(dev, desc);
439 if (!child)
440 return NULL;
441
442 init_data = of_get_regulator_init_data(dev, child, desc);
443 if (!init_data) {
444 dev_err(dev, "failed to parse DT for regulator %pOFn\n", child);
445 goto error;
446 }
447
448 if (desc->of_parse_cb) {
449 int ret;
450
451 ret = desc->of_parse_cb(child, desc, config);
452 if (ret) {
453 if (ret == -EPROBE_DEFER) {
454 of_node_put(child);
455 return ERR_PTR(-EPROBE_DEFER);
456 }
457 dev_err(dev,
458 "driver callback failed to parse DT for regulator %pOFn\n",
459 child);
460 goto error;
461 }
462 }
463
464 *node = child;
465
466 return init_data;
467
468error:
469 of_node_put(child);
470
471 return NULL;
472}
473
474struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
475{
476 struct device *dev;
477
478 dev = class_find_device_by_of_node(®ulator_class, np);
479
480 return dev ? dev_to_rdev(dev) : NULL;
481}
482
483/*
484 * Returns number of regulators coupled with rdev.
485 */
486int of_get_n_coupled(struct regulator_dev *rdev)
487{
488 struct device_node *node = rdev->dev.of_node;
489 int n_phandles;
490
491 n_phandles = of_count_phandle_with_args(node,
492 "regulator-coupled-with",
493 NULL);
494
495 return (n_phandles > 0) ? n_phandles : 0;
496}
497
498/* Looks for "to_find" device_node in src's "regulator-coupled-with" property */
499static bool of_coupling_find_node(struct device_node *src,
500 struct device_node *to_find,
501 int *index)
502{
503 int n_phandles, i;
504 bool found = false;
505
506 n_phandles = of_count_phandle_with_args(src,
507 "regulator-coupled-with",
508 NULL);
509
510 for (i = 0; i < n_phandles; i++) {
511 struct device_node *tmp = of_parse_phandle(src,
512 "regulator-coupled-with", i);
513
514 if (!tmp)
515 break;
516
517 /* found */
518 if (tmp == to_find)
519 found = true;
520
521 of_node_put(tmp);
522
523 if (found) {
524 *index = i;
525 break;
526 }
527 }
528
529 return found;
530}
531
532/**
533 * of_check_coupling_data - Parse rdev's coupling properties and check data
534 * consistency
535 * @rdev: pointer to regulator_dev whose data is checked
536 *
537 * Function checks if all the following conditions are met:
538 * - rdev's max_spread is greater than 0
539 * - all coupled regulators have the same max_spread
540 * - all coupled regulators have the same number of regulator_dev phandles
541 * - all regulators are linked to each other
542 *
543 * Returns true if all conditions are met.
544 */
545bool of_check_coupling_data(struct regulator_dev *rdev)
546{
547 struct device_node *node = rdev->dev.of_node;
548 int n_phandles = of_get_n_coupled(rdev);
549 struct device_node *c_node;
550 int index;
551 int i;
552 bool ret = true;
553
554 /* iterate over rdev's phandles */
555 for (i = 0; i < n_phandles; i++) {
556 int max_spread = rdev->constraints->max_spread[i];
557 int c_max_spread, c_n_phandles;
558
559 if (max_spread <= 0) {
560 dev_err(&rdev->dev, "max_spread value invalid\n");
561 return false;
562 }
563
564 c_node = of_parse_phandle(node,
565 "regulator-coupled-with", i);
566
567 if (!c_node)
568 ret = false;
569
570 c_n_phandles = of_count_phandle_with_args(c_node,
571 "regulator-coupled-with",
572 NULL);
573
574 if (c_n_phandles != n_phandles) {
575 dev_err(&rdev->dev, "number of coupled reg phandles mismatch\n");
576 ret = false;
577 goto clean;
578 }
579
580 if (!of_coupling_find_node(c_node, node, &index)) {
581 dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
582 ret = false;
583 goto clean;
584 }
585
586 if (of_property_read_u32_index(c_node, "regulator-coupled-max-spread",
587 index, &c_max_spread)) {
588 ret = false;
589 goto clean;
590 }
591
592 if (c_max_spread != max_spread) {
593 dev_err(&rdev->dev,
594 "coupled regulators max_spread mismatch\n");
595 ret = false;
596 goto clean;
597 }
598
599clean:
600 of_node_put(c_node);
601 if (!ret)
602 break;
603 }
604
605 return ret;
606}
607
608/**
609 * of_parse_coupled regulator - Get regulator_dev pointer from rdev's property
610 * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse
611 * "regulator-coupled-with" property
612 * @index: Index in phandles array
613 *
614 * Returns the regulator_dev pointer parsed from DTS. If it has not been yet
615 * registered, returns NULL
616 */
617struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,
618 int index)
619{
620 struct device_node *node = rdev->dev.of_node;
621 struct device_node *c_node;
622 struct regulator_dev *c_rdev;
623
624 c_node = of_parse_phandle(node, "regulator-coupled-with", index);
625 if (!c_node)
626 return NULL;
627
628 c_rdev = of_find_regulator_by_node(c_node);
629
630 of_node_put(c_node);
631
632 return c_rdev;
633}
1/*
2 * OF helpers for regulator framework
3 *
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Rajendra Nayak <rnayak@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/of.h>
16#include <linux/regulator/machine.h>
17#include <linux/regulator/of_regulator.h>
18
19static void of_get_regulation_constraints(struct device_node *np,
20 struct regulator_init_data **init_data)
21{
22 const __be32 *min_uV, *max_uV, *uV_offset;
23 const __be32 *min_uA, *max_uA;
24 struct regulation_constraints *constraints = &(*init_data)->constraints;
25
26 constraints->name = of_get_property(np, "regulator-name", NULL);
27
28 min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
29 if (min_uV)
30 constraints->min_uV = be32_to_cpu(*min_uV);
31 max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
32 if (max_uV)
33 constraints->max_uV = be32_to_cpu(*max_uV);
34
35 /* Voltage change possible? */
36 if (constraints->min_uV != constraints->max_uV)
37 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
38 /* Only one voltage? Then make sure it's set. */
39 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
40 constraints->apply_uV = true;
41
42 uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
43 if (uV_offset)
44 constraints->uV_offset = be32_to_cpu(*uV_offset);
45 min_uA = of_get_property(np, "regulator-min-microamp", NULL);
46 if (min_uA)
47 constraints->min_uA = be32_to_cpu(*min_uA);
48 max_uA = of_get_property(np, "regulator-max-microamp", NULL);
49 if (max_uA)
50 constraints->max_uA = be32_to_cpu(*max_uA);
51
52 /* Current change possible? */
53 if (constraints->min_uA != constraints->max_uA)
54 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
55
56 if (of_find_property(np, "regulator-boot-on", NULL))
57 constraints->boot_on = true;
58
59 if (of_find_property(np, "regulator-always-on", NULL))
60 constraints->always_on = true;
61 else /* status change should be possible if not always on. */
62 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
63}
64
65/**
66 * of_get_regulator_init_data - extract regulator_init_data structure info
67 * @dev: device requesting for regulator_init_data
68 *
69 * Populates regulator_init_data structure by extracting data from device
70 * tree node, returns a pointer to the populated struture or NULL if memory
71 * alloc fails.
72 */
73struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
74 struct device_node *node)
75{
76 struct regulator_init_data *init_data;
77
78 if (!node)
79 return NULL;
80
81 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
82 if (!init_data)
83 return NULL; /* Out of memory? */
84
85 of_get_regulation_constraints(node, &init_data);
86 return init_data;
87}
88EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
89
90/**
91 * of_regulator_match - extract regulator init data
92 * @dev: device requesting the data
93 * @node: parent device node of the regulators
94 * @matches: match table for the regulators
95 * @num_matches: number of entries in match table
96 *
97 * This function uses a match table specified by the regulator driver and
98 * looks up the corresponding init data in the device tree. Note that the
99 * match table is modified in place.
100 *
101 * Returns the number of matches found or a negative error code on failure.
102 */
103int of_regulator_match(struct device *dev, struct device_node *node,
104 struct of_regulator_match *matches,
105 unsigned int num_matches)
106{
107 unsigned int count = 0;
108 unsigned int i;
109
110 if (!dev || !node)
111 return -EINVAL;
112
113 for (i = 0; i < num_matches; i++) {
114 struct of_regulator_match *match = &matches[i];
115 struct device_node *child;
116
117 child = of_find_node_by_name(node, match->name);
118 if (!child)
119 continue;
120
121 match->init_data = of_get_regulator_init_data(dev, child);
122 if (!match->init_data) {
123 dev_err(dev, "failed to parse DT for regulator %s\n",
124 child->name);
125 return -EINVAL;
126 }
127
128 match->of_node = child;
129 count++;
130 }
131
132 return count;
133}
134EXPORT_SYMBOL_GPL(of_regulator_match);