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 void fill_limit(int *limit, int val)
25{
26 if (val)
27 if (val == 1)
28 *limit = REGULATOR_NOTIF_LIMIT_ENABLE;
29 else
30 *limit = val;
31 else
32 *limit = REGULATOR_NOTIF_LIMIT_DISABLE;
33}
34
35static void of_get_regulator_prot_limits(struct device_node *np,
36 struct regulation_constraints *constraints)
37{
38 u32 pval;
39 int i;
40 static const char *const props[] = {
41 "regulator-oc-%s-microamp",
42 "regulator-ov-%s-microvolt",
43 "regulator-temp-%s-kelvin",
44 "regulator-uv-%s-microvolt",
45 };
46 struct notification_limit *limits[] = {
47 &constraints->over_curr_limits,
48 &constraints->over_voltage_limits,
49 &constraints->temp_limits,
50 &constraints->under_voltage_limits,
51 };
52 bool set[4] = {0};
53
54 /* Protection limits: */
55 for (i = 0; i < ARRAY_SIZE(props); i++) {
56 char prop[255];
57 bool found;
58 int j;
59 static const char *const lvl[] = {
60 "protection", "error", "warn"
61 };
62 int *l[] = {
63 &limits[i]->prot, &limits[i]->err, &limits[i]->warn,
64 };
65
66 for (j = 0; j < ARRAY_SIZE(lvl); j++) {
67 snprintf(buf: prop, size: 255, fmt: props[i], lvl[j]);
68 found = !of_property_read_u32(np, propname: prop, out_value: &pval);
69 if (found)
70 fill_limit(limit: l[j], val: pval);
71 set[i] |= found;
72 }
73 }
74 constraints->over_current_detection = set[0];
75 constraints->over_voltage_detection = set[1];
76 constraints->over_temp_detection = set[2];
77 constraints->under_voltage_detection = set[3];
78}
79
80static int of_get_regulation_constraints(struct device *dev,
81 struct device_node *np,
82 struct regulator_init_data **init_data,
83 const struct regulator_desc *desc)
84{
85 struct regulation_constraints *constraints = &(*init_data)->constraints;
86 struct regulator_state *suspend_state;
87 struct device_node *suspend_np;
88 unsigned int mode;
89 int ret, i, len;
90 int n_phandles;
91 u32 pval;
92
93 n_phandles = of_count_phandle_with_args(np, list_name: "regulator-coupled-with",
94 NULL);
95 n_phandles = max(n_phandles, 0);
96
97 constraints->name = of_get_property(node: np, name: "regulator-name", NULL);
98
99 if (!of_property_read_u32(np, propname: "regulator-min-microvolt", out_value: &pval))
100 constraints->min_uV = pval;
101
102 if (!of_property_read_u32(np, propname: "regulator-max-microvolt", out_value: &pval))
103 constraints->max_uV = pval;
104
105 /* Voltage change possible? */
106 if (constraints->min_uV != constraints->max_uV)
107 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
108
109 /* Do we have a voltage range, if so try to apply it? */
110 if (constraints->min_uV && constraints->max_uV)
111 constraints->apply_uV = true;
112
113 if (!of_property_read_u32(np, propname: "regulator-microvolt-offset", out_value: &pval))
114 constraints->uV_offset = pval;
115 if (!of_property_read_u32(np, propname: "regulator-min-microamp", out_value: &pval))
116 constraints->min_uA = pval;
117 if (!of_property_read_u32(np, propname: "regulator-max-microamp", out_value: &pval))
118 constraints->max_uA = pval;
119
120 if (!of_property_read_u32(np, propname: "regulator-input-current-limit-microamp",
121 out_value: &pval))
122 constraints->ilim_uA = pval;
123
124 /* Current change possible? */
125 if (constraints->min_uA != constraints->max_uA)
126 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
127
128 constraints->boot_on = of_property_read_bool(np, propname: "regulator-boot-on");
129 constraints->always_on = of_property_read_bool(np, propname: "regulator-always-on");
130 if (!constraints->always_on) /* status change should be possible. */
131 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
132
133 constraints->pull_down = of_property_read_bool(np, propname: "regulator-pull-down");
134 constraints->system_critical = of_property_read_bool(np,
135 propname: "system-critical-regulator");
136
137 if (of_property_read_bool(np, propname: "regulator-allow-bypass"))
138 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
139
140 if (of_property_read_bool(np, propname: "regulator-allow-set-load"))
141 constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
142
143 ret = of_property_read_u32(np, propname: "regulator-ramp-delay", out_value: &pval);
144 if (!ret) {
145 if (pval)
146 constraints->ramp_delay = pval;
147 else
148 constraints->ramp_disable = true;
149 }
150
151 ret = of_property_read_u32(np, propname: "regulator-settling-time-us", out_value: &pval);
152 if (!ret)
153 constraints->settling_time = pval;
154
155 ret = of_property_read_u32(np, propname: "regulator-settling-time-up-us", out_value: &pval);
156 if (!ret)
157 constraints->settling_time_up = pval;
158 if (constraints->settling_time_up && constraints->settling_time) {
159 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n",
160 np);
161 constraints->settling_time_up = 0;
162 }
163
164 ret = of_property_read_u32(np, propname: "regulator-settling-time-down-us",
165 out_value: &pval);
166 if (!ret)
167 constraints->settling_time_down = pval;
168 if (constraints->settling_time_down && constraints->settling_time) {
169 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n",
170 np);
171 constraints->settling_time_down = 0;
172 }
173
174 ret = of_property_read_u32(np, propname: "regulator-enable-ramp-delay", out_value: &pval);
175 if (!ret)
176 constraints->enable_time = pval;
177
178 ret = of_property_read_u32(np, propname: "regulator-uv-survival-time-ms", out_value: &pval);
179 if (!ret)
180 constraints->uv_less_critical_window_ms = pval;
181 else
182 constraints->uv_less_critical_window_ms =
183 REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS;
184
185 constraints->soft_start = of_property_read_bool(np,
186 propname: "regulator-soft-start");
187 ret = of_property_read_u32(np, propname: "regulator-active-discharge", out_value: &pval);
188 if (!ret) {
189 constraints->active_discharge =
190 (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
191 REGULATOR_ACTIVE_DISCHARGE_DISABLE;
192 }
193
194 if (!of_property_read_u32(np, propname: "regulator-initial-mode", out_value: &pval)) {
195 if (desc && desc->of_map_mode) {
196 mode = desc->of_map_mode(pval);
197 if (mode == REGULATOR_MODE_INVALID)
198 pr_err("%pOFn: invalid mode %u\n", np, pval);
199 else
200 constraints->initial_mode = mode;
201 } else {
202 pr_warn("%pOFn: mapping for mode %d not defined\n",
203 np, pval);
204 }
205 }
206
207 len = of_property_count_elems_of_size(np, propname: "regulator-allowed-modes",
208 elem_size: sizeof(u32));
209 if (len > 0) {
210 if (desc && desc->of_map_mode) {
211 for (i = 0; i < len; i++) {
212 ret = of_property_read_u32_index(np,
213 propname: "regulator-allowed-modes", index: i, out_value: &pval);
214 if (ret) {
215 pr_err("%pOFn: couldn't read allowed modes index %d, ret=%d\n",
216 np, i, ret);
217 break;
218 }
219 mode = desc->of_map_mode(pval);
220 if (mode == REGULATOR_MODE_INVALID)
221 pr_err("%pOFn: invalid regulator-allowed-modes element %u\n",
222 np, pval);
223 else
224 constraints->valid_modes_mask |= mode;
225 }
226 if (constraints->valid_modes_mask)
227 constraints->valid_ops_mask
228 |= REGULATOR_CHANGE_MODE;
229 } else {
230 pr_warn("%pOFn: mode mapping not defined\n", np);
231 }
232 }
233
234 if (!of_property_read_u32(np, propname: "regulator-system-load", out_value: &pval))
235 constraints->system_load = pval;
236
237 if (n_phandles) {
238 constraints->max_spread = devm_kzalloc(dev,
239 size: sizeof(*constraints->max_spread) * n_phandles,
240 GFP_KERNEL);
241
242 if (!constraints->max_spread)
243 return -ENOMEM;
244
245 of_property_read_u32_array(np, propname: "regulator-coupled-max-spread",
246 out_values: constraints->max_spread, sz: n_phandles);
247 }
248
249 if (!of_property_read_u32(np, propname: "regulator-max-step-microvolt",
250 out_value: &pval))
251 constraints->max_uV_step = pval;
252
253 constraints->over_current_protection = of_property_read_bool(np,
254 propname: "regulator-over-current-protection");
255
256 of_get_regulator_prot_limits(np, constraints);
257
258 for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
259 switch (i) {
260 case PM_SUSPEND_MEM:
261 suspend_state = &constraints->state_mem;
262 break;
263 case PM_SUSPEND_MAX:
264 suspend_state = &constraints->state_disk;
265 break;
266 case PM_SUSPEND_STANDBY:
267 suspend_state = &constraints->state_standby;
268 break;
269 case PM_SUSPEND_ON:
270 case PM_SUSPEND_TO_IDLE:
271 default:
272 continue;
273 }
274
275 suspend_np = of_get_child_by_name(node: np, name: regulator_states[i]);
276 if (!suspend_np)
277 continue;
278 if (!suspend_state) {
279 of_node_put(node: suspend_np);
280 continue;
281 }
282
283 if (!of_property_read_u32(np: suspend_np, propname: "regulator-mode",
284 out_value: &pval)) {
285 if (desc && desc->of_map_mode) {
286 mode = desc->of_map_mode(pval);
287 if (mode == REGULATOR_MODE_INVALID)
288 pr_err("%pOFn: invalid mode %u\n",
289 np, pval);
290 else
291 suspend_state->mode = mode;
292 } else {
293 pr_warn("%pOFn: mapping for mode %d not defined\n",
294 np, pval);
295 }
296 }
297
298 if (of_property_read_bool(np: suspend_np,
299 propname: "regulator-on-in-suspend"))
300 suspend_state->enabled = ENABLE_IN_SUSPEND;
301 else if (of_property_read_bool(np: suspend_np,
302 propname: "regulator-off-in-suspend"))
303 suspend_state->enabled = DISABLE_IN_SUSPEND;
304
305 if (!of_property_read_u32(np: suspend_np,
306 propname: "regulator-suspend-min-microvolt", out_value: &pval))
307 suspend_state->min_uV = pval;
308
309 if (!of_property_read_u32(np: suspend_np,
310 propname: "regulator-suspend-max-microvolt", out_value: &pval))
311 suspend_state->max_uV = pval;
312
313 if (!of_property_read_u32(np: suspend_np,
314 propname: "regulator-suspend-microvolt", out_value: &pval))
315 suspend_state->uV = pval;
316 else /* otherwise use min_uV as default suspend voltage */
317 suspend_state->uV = suspend_state->min_uV;
318
319 if (of_property_read_bool(np: suspend_np,
320 propname: "regulator-changeable-in-suspend"))
321 suspend_state->changeable = true;
322
323 if (i == PM_SUSPEND_MEM)
324 constraints->initial_state = PM_SUSPEND_MEM;
325
326 of_node_put(node: suspend_np);
327 suspend_state = NULL;
328 suspend_np = NULL;
329 }
330
331 return 0;
332}
333
334/**
335 * of_get_regulator_init_data - extract regulator_init_data structure info
336 * @dev: device requesting for regulator_init_data
337 * @node: regulator device node
338 * @desc: regulator description
339 *
340 * Populates regulator_init_data structure by extracting data from device
341 * tree node, returns a pointer to the populated structure or NULL if memory
342 * alloc fails.
343 */
344struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
345 struct device_node *node,
346 const struct regulator_desc *desc)
347{
348 struct regulator_init_data *init_data;
349
350 if (!node)
351 return NULL;
352
353 init_data = devm_kzalloc(dev, size: sizeof(*init_data), GFP_KERNEL);
354 if (!init_data)
355 return NULL; /* Out of memory? */
356
357 if (of_get_regulation_constraints(dev, np: node, init_data: &init_data, desc))
358 return NULL;
359
360 return init_data;
361}
362EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
363
364struct devm_of_regulator_matches {
365 struct of_regulator_match *matches;
366 unsigned int num_matches;
367};
368
369static void devm_of_regulator_put_matches(struct device *dev, void *res)
370{
371 struct devm_of_regulator_matches *devm_matches = res;
372 int i;
373
374 for (i = 0; i < devm_matches->num_matches; i++)
375 of_node_put(node: devm_matches->matches[i].of_node);
376}
377
378/**
379 * of_regulator_match - extract multiple regulator init data from device tree.
380 * @dev: device requesting the data
381 * @node: parent device node of the regulators
382 * @matches: match table for the regulators
383 * @num_matches: number of entries in match table
384 *
385 * This function uses a match table specified by the regulator driver to
386 * parse regulator init data from the device tree. @node is expected to
387 * contain a set of child nodes, each providing the init data for one
388 * regulator. The data parsed from a child node will be matched to a regulator
389 * based on either the deprecated property regulator-compatible if present,
390 * or otherwise the child node's name. Note that the match table is modified
391 * in place and an additional of_node reference is taken for each matched
392 * regulator.
393 *
394 * Returns the number of matches found or a negative error code on failure.
395 */
396int of_regulator_match(struct device *dev, struct device_node *node,
397 struct of_regulator_match *matches,
398 unsigned int num_matches)
399{
400 unsigned int count = 0;
401 unsigned int i;
402 const char *name;
403 struct device_node *child;
404 struct devm_of_regulator_matches *devm_matches;
405
406 if (!dev || !node)
407 return -EINVAL;
408
409 devm_matches = devres_alloc(devm_of_regulator_put_matches,
410 sizeof(struct devm_of_regulator_matches),
411 GFP_KERNEL);
412 if (!devm_matches)
413 return -ENOMEM;
414
415 devm_matches->matches = matches;
416 devm_matches->num_matches = num_matches;
417
418 devres_add(dev, res: devm_matches);
419
420 for (i = 0; i < num_matches; i++) {
421 struct of_regulator_match *match = &matches[i];
422 match->init_data = NULL;
423 match->of_node = NULL;
424 }
425
426 for_each_child_of_node(node, child) {
427 name = of_get_property(node: child,
428 name: "regulator-compatible", NULL);
429 if (!name)
430 name = child->name;
431 for (i = 0; i < num_matches; i++) {
432 struct of_regulator_match *match = &matches[i];
433 if (match->of_node)
434 continue;
435
436 if (strcmp(match->name, name))
437 continue;
438
439 match->init_data =
440 of_get_regulator_init_data(dev, child,
441 match->desc);
442 if (!match->init_data) {
443 dev_err(dev,
444 "failed to parse DT for regulator %pOFn\n",
445 child);
446 of_node_put(node: child);
447 return -EINVAL;
448 }
449 match->of_node = of_node_get(node: child);
450 count++;
451 break;
452 }
453 }
454
455 return count;
456}
457EXPORT_SYMBOL_GPL(of_regulator_match);
458
459static struct
460device_node *regulator_of_get_init_node(struct device *dev,
461 const struct regulator_desc *desc)
462{
463 struct device_node *search, *child;
464 const char *name;
465
466 if (!dev->of_node || !desc->of_match)
467 return NULL;
468
469 if (desc->regulators_node) {
470 search = of_get_child_by_name(node: dev->of_node,
471 name: desc->regulators_node);
472 } else {
473 search = of_node_get(node: dev->of_node);
474
475 if (!strcmp(desc->of_match, search->name))
476 return search;
477 }
478
479 if (!search) {
480 dev_dbg(dev, "Failed to find regulator container node '%s'\n",
481 desc->regulators_node);
482 return NULL;
483 }
484
485 for_each_available_child_of_node(search, child) {
486 name = of_get_property(node: child, name: "regulator-compatible", NULL);
487 if (!name) {
488 if (!desc->of_match_full_name)
489 name = child->name;
490 else
491 name = child->full_name;
492 }
493
494 if (!strcmp(desc->of_match, name)) {
495 of_node_put(node: search);
496 /*
497 * 'of_node_get(child)' is already performed by the
498 * for_each loop.
499 */
500 return child;
501 }
502 }
503
504 of_node_put(node: search);
505
506 return NULL;
507}
508
509struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
510 const struct regulator_desc *desc,
511 struct regulator_config *config,
512 struct device_node **node)
513{
514 struct device_node *child;
515 struct regulator_init_data *init_data = NULL;
516
517 child = regulator_of_get_init_node(dev: config->dev, desc);
518 if (!child)
519 return NULL;
520
521 init_data = of_get_regulator_init_data(dev, child, desc);
522 if (!init_data) {
523 dev_err(dev, "failed to parse DT for regulator %pOFn\n", child);
524 goto error;
525 }
526
527 if (desc->of_parse_cb) {
528 int ret;
529
530 ret = desc->of_parse_cb(child, desc, config);
531 if (ret) {
532 if (ret == -EPROBE_DEFER) {
533 of_node_put(node: child);
534 return ERR_PTR(error: -EPROBE_DEFER);
535 }
536 dev_err(dev,
537 "driver callback failed to parse DT for regulator %pOFn\n",
538 child);
539 goto error;
540 }
541 }
542
543 *node = child;
544
545 return init_data;
546
547error:
548 of_node_put(node: child);
549
550 return NULL;
551}
552
553struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
554{
555 struct device *dev;
556
557 dev = class_find_device_by_of_node(class: &regulator_class, np);
558
559 return dev ? dev_to_rdev(dev) : NULL;
560}
561
562/*
563 * Returns number of regulators coupled with rdev.
564 */
565int of_get_n_coupled(struct regulator_dev *rdev)
566{
567 struct device_node *node = rdev->dev.of_node;
568 int n_phandles;
569
570 n_phandles = of_count_phandle_with_args(np: node,
571 list_name: "regulator-coupled-with",
572 NULL);
573
574 return (n_phandles > 0) ? n_phandles : 0;
575}
576
577/* Looks for "to_find" device_node in src's "regulator-coupled-with" property */
578static bool of_coupling_find_node(struct device_node *src,
579 struct device_node *to_find,
580 int *index)
581{
582 int n_phandles, i;
583 bool found = false;
584
585 n_phandles = of_count_phandle_with_args(np: src,
586 list_name: "regulator-coupled-with",
587 NULL);
588
589 for (i = 0; i < n_phandles; i++) {
590 struct device_node *tmp = of_parse_phandle(np: src,
591 phandle_name: "regulator-coupled-with", index: i);
592
593 if (!tmp)
594 break;
595
596 /* found */
597 if (tmp == to_find)
598 found = true;
599
600 of_node_put(node: tmp);
601
602 if (found) {
603 *index = i;
604 break;
605 }
606 }
607
608 return found;
609}
610
611/**
612 * of_check_coupling_data - Parse rdev's coupling properties and check data
613 * consistency
614 * @rdev: pointer to regulator_dev whose data is checked
615 *
616 * Function checks if all the following conditions are met:
617 * - rdev's max_spread is greater than 0
618 * - all coupled regulators have the same max_spread
619 * - all coupled regulators have the same number of regulator_dev phandles
620 * - all regulators are linked to each other
621 *
622 * Returns true if all conditions are met.
623 */
624bool of_check_coupling_data(struct regulator_dev *rdev)
625{
626 struct device_node *node = rdev->dev.of_node;
627 int n_phandles = of_get_n_coupled(rdev);
628 struct device_node *c_node;
629 int index;
630 int i;
631 bool ret = true;
632
633 /* iterate over rdev's phandles */
634 for (i = 0; i < n_phandles; i++) {
635 int max_spread = rdev->constraints->max_spread[i];
636 int c_max_spread, c_n_phandles;
637
638 if (max_spread <= 0) {
639 dev_err(&rdev->dev, "max_spread value invalid\n");
640 return false;
641 }
642
643 c_node = of_parse_phandle(np: node,
644 phandle_name: "regulator-coupled-with", index: i);
645
646 if (!c_node)
647 ret = false;
648
649 c_n_phandles = of_count_phandle_with_args(np: c_node,
650 list_name: "regulator-coupled-with",
651 NULL);
652
653 if (c_n_phandles != n_phandles) {
654 dev_err(&rdev->dev, "number of coupled reg phandles mismatch\n");
655 ret = false;
656 goto clean;
657 }
658
659 if (!of_coupling_find_node(src: c_node, to_find: node, index: &index)) {
660 dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
661 ret = false;
662 goto clean;
663 }
664
665 if (of_property_read_u32_index(np: c_node, propname: "regulator-coupled-max-spread",
666 index, out_value: &c_max_spread)) {
667 ret = false;
668 goto clean;
669 }
670
671 if (c_max_spread != max_spread) {
672 dev_err(&rdev->dev,
673 "coupled regulators max_spread mismatch\n");
674 ret = false;
675 goto clean;
676 }
677
678clean:
679 of_node_put(node: c_node);
680 if (!ret)
681 break;
682 }
683
684 return ret;
685}
686
687/**
688 * of_parse_coupled_regulator() - Get regulator_dev pointer from rdev's property
689 * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse
690 * "regulator-coupled-with" property
691 * @index: Index in phandles array
692 *
693 * Returns the regulator_dev pointer parsed from DTS. If it has not been yet
694 * registered, returns NULL
695 */
696struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,
697 int index)
698{
699 struct device_node *node = rdev->dev.of_node;
700 struct device_node *c_node;
701 struct regulator_dev *c_rdev;
702
703 c_node = of_parse_phandle(np: node, phandle_name: "regulator-coupled-with", index);
704 if (!c_node)
705 return NULL;
706
707 c_rdev = of_find_regulator_by_node(np: c_node);
708
709 of_node_put(node: c_node);
710
711 return c_rdev;
712}
713
714/*
715 * Check if name is a supply name according to the '*-supply' pattern
716 * return 0 if false
717 * return length of supply name without the -supply
718 */
719static int is_supply_name(const char *name)
720{
721 int strs, i;
722
723 strs = strlen(name);
724 /* string need to be at minimum len(x-supply) */
725 if (strs < 8)
726 return 0;
727 for (i = strs - 6; i > 0; i--) {
728 /* find first '-' and check if right part is supply */
729 if (name[i] != '-')
730 continue;
731 if (strcmp(name + i + 1, "supply") != 0)
732 return 0;
733 return i;
734 }
735 return 0;
736}
737
738/*
739 * of_regulator_bulk_get_all - get multiple regulator consumers
740 *
741 * @dev: Device to supply
742 * @np: device node to search for consumers
743 * @consumers: Configuration of consumers; clients are stored here.
744 *
745 * @return number of regulators on success, an errno on failure.
746 *
747 * This helper function allows drivers to get several regulator
748 * consumers in one operation. If any of the regulators cannot be
749 * acquired then any regulators that were allocated will be freed
750 * before returning to the caller.
751 */
752int of_regulator_bulk_get_all(struct device *dev, struct device_node *np,
753 struct regulator_bulk_data **consumers)
754{
755 int num_consumers = 0;
756 struct regulator *tmp;
757 struct property *prop;
758 int i, n = 0, ret;
759 char name[64];
760
761 *consumers = NULL;
762
763 /*
764 * first pass: get numbers of xxx-supply
765 * second pass: fill consumers
766 */
767restart:
768 for_each_property_of_node(np, prop) {
769 i = is_supply_name(name: prop->name);
770 if (i == 0)
771 continue;
772 if (!*consumers) {
773 num_consumers++;
774 continue;
775 } else {
776 memcpy(name, prop->name, i);
777 name[i] = '\0';
778 tmp = regulator_get(dev, id: name);
779 if (IS_ERR(ptr: tmp)) {
780 ret = -EINVAL;
781 goto error;
782 }
783 (*consumers)[n].consumer = tmp;
784 n++;
785 continue;
786 }
787 }
788 if (*consumers)
789 return num_consumers;
790 if (num_consumers == 0)
791 return 0;
792 *consumers = kmalloc_array(n: num_consumers,
793 size: sizeof(struct regulator_bulk_data),
794 GFP_KERNEL);
795 if (!*consumers)
796 return -ENOMEM;
797 goto restart;
798
799error:
800 while (--n >= 0)
801 regulator_put(regulator: consumers[n]->consumer);
802 return ret;
803}
804EXPORT_SYMBOL_GPL(of_regulator_bulk_get_all);
805

source code of linux/drivers/regulator/of_regulator.c