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
18 static 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
fill_limit(int * limit,int val)24 static 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
of_get_regulator_prot_limits(struct device_node * np,struct regulation_constraints * constraints)35 static 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(prop, 255, props[i], lvl[j]);
68 found = !of_property_read_u32(np, prop, &pval);
69 if (found)
70 fill_limit(l[j], 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
of_get_regulation_constraints(struct device * dev,struct device_node * np,struct regulator_init_data ** init_data,const struct regulator_desc * desc)80 static 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, "regulator-coupled-with",
94 NULL);
95 n_phandles = max(n_phandles, 0);
96
97 constraints->name = of_get_property(np, "regulator-name", NULL);
98
99 if (!of_property_read_u32(np, "regulator-min-microvolt", &pval))
100 constraints->min_uV = pval;
101
102 if (!of_property_read_u32(np, "regulator-max-microvolt", &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, "regulator-microvolt-offset", &pval))
114 constraints->uV_offset = pval;
115 if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
116 constraints->min_uA = pval;
117 if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
118 constraints->max_uA = pval;
119
120 if (!of_property_read_u32(np, "regulator-input-current-limit-microamp",
121 &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, "regulator-boot-on");
129 constraints->always_on = of_property_read_bool(np, "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, "regulator-pull-down");
134
135 if (of_property_read_bool(np, "regulator-allow-bypass"))
136 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
137
138 if (of_property_read_bool(np, "regulator-allow-set-load"))
139 constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
140
141 ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
142 if (!ret) {
143 if (pval)
144 constraints->ramp_delay = pval;
145 else
146 constraints->ramp_disable = true;
147 }
148
149 ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);
150 if (!ret)
151 constraints->settling_time = pval;
152
153 ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval);
154 if (!ret)
155 constraints->settling_time_up = pval;
156 if (constraints->settling_time_up && constraints->settling_time) {
157 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n",
158 np);
159 constraints->settling_time_up = 0;
160 }
161
162 ret = of_property_read_u32(np, "regulator-settling-time-down-us",
163 &pval);
164 if (!ret)
165 constraints->settling_time_down = pval;
166 if (constraints->settling_time_down && constraints->settling_time) {
167 pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n",
168 np);
169 constraints->settling_time_down = 0;
170 }
171
172 ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
173 if (!ret)
174 constraints->enable_time = pval;
175
176 constraints->soft_start = of_property_read_bool(np,
177 "regulator-soft-start");
178 ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
179 if (!ret) {
180 constraints->active_discharge =
181 (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
182 REGULATOR_ACTIVE_DISCHARGE_DISABLE;
183 }
184
185 if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
186 if (desc && desc->of_map_mode) {
187 mode = desc->of_map_mode(pval);
188 if (mode == REGULATOR_MODE_INVALID)
189 pr_err("%pOFn: invalid mode %u\n", np, pval);
190 else
191 constraints->initial_mode = mode;
192 } else {
193 pr_warn("%pOFn: mapping for mode %d not defined\n",
194 np, pval);
195 }
196 }
197
198 len = of_property_count_elems_of_size(np, "regulator-allowed-modes",
199 sizeof(u32));
200 if (len > 0) {
201 if (desc && desc->of_map_mode) {
202 for (i = 0; i < len; i++) {
203 ret = of_property_read_u32_index(np,
204 "regulator-allowed-modes", i, &pval);
205 if (ret) {
206 pr_err("%pOFn: couldn't read allowed modes index %d, ret=%d\n",
207 np, i, ret);
208 break;
209 }
210 mode = desc->of_map_mode(pval);
211 if (mode == REGULATOR_MODE_INVALID)
212 pr_err("%pOFn: invalid regulator-allowed-modes element %u\n",
213 np, pval);
214 else
215 constraints->valid_modes_mask |= mode;
216 }
217 if (constraints->valid_modes_mask)
218 constraints->valid_ops_mask
219 |= REGULATOR_CHANGE_MODE;
220 } else {
221 pr_warn("%pOFn: mode mapping not defined\n", np);
222 }
223 }
224
225 if (!of_property_read_u32(np, "regulator-system-load", &pval))
226 constraints->system_load = pval;
227
228 if (n_phandles) {
229 constraints->max_spread = devm_kzalloc(dev,
230 sizeof(*constraints->max_spread) * n_phandles,
231 GFP_KERNEL);
232
233 if (!constraints->max_spread)
234 return -ENOMEM;
235
236 of_property_read_u32_array(np, "regulator-coupled-max-spread",
237 constraints->max_spread, n_phandles);
238 }
239
240 if (!of_property_read_u32(np, "regulator-max-step-microvolt",
241 &pval))
242 constraints->max_uV_step = pval;
243
244 constraints->over_current_protection = of_property_read_bool(np,
245 "regulator-over-current-protection");
246
247 of_get_regulator_prot_limits(np, constraints);
248
249 for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
250 switch (i) {
251 case PM_SUSPEND_MEM:
252 suspend_state = &constraints->state_mem;
253 break;
254 case PM_SUSPEND_MAX:
255 suspend_state = &constraints->state_disk;
256 break;
257 case PM_SUSPEND_STANDBY:
258 suspend_state = &constraints->state_standby;
259 break;
260 case PM_SUSPEND_ON:
261 case PM_SUSPEND_TO_IDLE:
262 default:
263 continue;
264 }
265
266 suspend_np = of_get_child_by_name(np, regulator_states[i]);
267 if (!suspend_np)
268 continue;
269 if (!suspend_state) {
270 of_node_put(suspend_np);
271 continue;
272 }
273
274 if (!of_property_read_u32(suspend_np, "regulator-mode",
275 &pval)) {
276 if (desc && desc->of_map_mode) {
277 mode = desc->of_map_mode(pval);
278 if (mode == REGULATOR_MODE_INVALID)
279 pr_err("%pOFn: invalid mode %u\n",
280 np, pval);
281 else
282 suspend_state->mode = mode;
283 } else {
284 pr_warn("%pOFn: mapping for mode %d not defined\n",
285 np, pval);
286 }
287 }
288
289 if (of_property_read_bool(suspend_np,
290 "regulator-on-in-suspend"))
291 suspend_state->enabled = ENABLE_IN_SUSPEND;
292 else if (of_property_read_bool(suspend_np,
293 "regulator-off-in-suspend"))
294 suspend_state->enabled = DISABLE_IN_SUSPEND;
295
296 if (!of_property_read_u32(suspend_np,
297 "regulator-suspend-min-microvolt", &pval))
298 suspend_state->min_uV = pval;
299
300 if (!of_property_read_u32(suspend_np,
301 "regulator-suspend-max-microvolt", &pval))
302 suspend_state->max_uV = pval;
303
304 if (!of_property_read_u32(suspend_np,
305 "regulator-suspend-microvolt", &pval))
306 suspend_state->uV = pval;
307 else /* otherwise use min_uV as default suspend voltage */
308 suspend_state->uV = suspend_state->min_uV;
309
310 if (of_property_read_bool(suspend_np,
311 "regulator-changeable-in-suspend"))
312 suspend_state->changeable = true;
313
314 if (i == PM_SUSPEND_MEM)
315 constraints->initial_state = PM_SUSPEND_MEM;
316
317 of_node_put(suspend_np);
318 suspend_state = NULL;
319 suspend_np = NULL;
320 }
321
322 return 0;
323 }
324
325 /**
326 * of_get_regulator_init_data - extract regulator_init_data structure info
327 * @dev: device requesting for regulator_init_data
328 * @node: regulator device node
329 * @desc: regulator description
330 *
331 * Populates regulator_init_data structure by extracting data from device
332 * tree node, returns a pointer to the populated structure or NULL if memory
333 * alloc fails.
334 */
of_get_regulator_init_data(struct device * dev,struct device_node * node,const struct regulator_desc * desc)335 struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
336 struct device_node *node,
337 const struct regulator_desc *desc)
338 {
339 struct regulator_init_data *init_data;
340
341 if (!node)
342 return NULL;
343
344 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
345 if (!init_data)
346 return NULL; /* Out of memory? */
347
348 if (of_get_regulation_constraints(dev, node, &init_data, desc))
349 return NULL;
350
351 return init_data;
352 }
353 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
354
355 struct devm_of_regulator_matches {
356 struct of_regulator_match *matches;
357 unsigned int num_matches;
358 };
359
devm_of_regulator_put_matches(struct device * dev,void * res)360 static void devm_of_regulator_put_matches(struct device *dev, void *res)
361 {
362 struct devm_of_regulator_matches *devm_matches = res;
363 int i;
364
365 for (i = 0; i < devm_matches->num_matches; i++)
366 of_node_put(devm_matches->matches[i].of_node);
367 }
368
369 /**
370 * of_regulator_match - extract multiple regulator init data from device tree.
371 * @dev: device requesting the data
372 * @node: parent device node of the regulators
373 * @matches: match table for the regulators
374 * @num_matches: number of entries in match table
375 *
376 * This function uses a match table specified by the regulator driver to
377 * parse regulator init data from the device tree. @node is expected to
378 * contain a set of child nodes, each providing the init data for one
379 * regulator. The data parsed from a child node will be matched to a regulator
380 * based on either the deprecated property regulator-compatible if present,
381 * or otherwise the child node's name. Note that the match table is modified
382 * in place and an additional of_node reference is taken for each matched
383 * regulator.
384 *
385 * Returns the number of matches found or a negative error code on failure.
386 */
of_regulator_match(struct device * dev,struct device_node * node,struct of_regulator_match * matches,unsigned int num_matches)387 int of_regulator_match(struct device *dev, struct device_node *node,
388 struct of_regulator_match *matches,
389 unsigned int num_matches)
390 {
391 unsigned int count = 0;
392 unsigned int i;
393 const char *name;
394 struct device_node *child;
395 struct devm_of_regulator_matches *devm_matches;
396
397 if (!dev || !node)
398 return -EINVAL;
399
400 devm_matches = devres_alloc(devm_of_regulator_put_matches,
401 sizeof(struct devm_of_regulator_matches),
402 GFP_KERNEL);
403 if (!devm_matches)
404 return -ENOMEM;
405
406 devm_matches->matches = matches;
407 devm_matches->num_matches = num_matches;
408
409 devres_add(dev, devm_matches);
410
411 for (i = 0; i < num_matches; i++) {
412 struct of_regulator_match *match = &matches[i];
413 match->init_data = NULL;
414 match->of_node = NULL;
415 }
416
417 for_each_child_of_node(node, child) {
418 name = of_get_property(child,
419 "regulator-compatible", NULL);
420 if (!name)
421 name = child->name;
422 for (i = 0; i < num_matches; i++) {
423 struct of_regulator_match *match = &matches[i];
424 if (match->of_node)
425 continue;
426
427 if (strcmp(match->name, name))
428 continue;
429
430 match->init_data =
431 of_get_regulator_init_data(dev, child,
432 match->desc);
433 if (!match->init_data) {
434 dev_err(dev,
435 "failed to parse DT for regulator %pOFn\n",
436 child);
437 of_node_put(child);
438 goto err_put;
439 }
440 match->of_node = of_node_get(child);
441 count++;
442 break;
443 }
444 }
445
446 return count;
447
448 err_put:
449 for (i = 0; i < num_matches; i++) {
450 struct of_regulator_match *match = &matches[i];
451
452 match->init_data = NULL;
453 if (match->of_node) {
454 of_node_put(match->of_node);
455 match->of_node = NULL;
456 }
457 }
458 return -EINVAL;
459 }
460 EXPORT_SYMBOL_GPL(of_regulator_match);
461
462 static struct
regulator_of_get_init_node(struct device * dev,const struct regulator_desc * desc)463 device_node *regulator_of_get_init_node(struct device *dev,
464 const struct regulator_desc *desc)
465 {
466 struct device_node *search, *child;
467 const char *name;
468
469 if (!dev->of_node || !desc->of_match)
470 return NULL;
471
472 if (desc->regulators_node) {
473 search = of_get_child_by_name(dev->of_node,
474 desc->regulators_node);
475 } else {
476 search = of_node_get(dev->of_node);
477
478 if (!strcmp(desc->of_match, search->name))
479 return search;
480 }
481
482 if (!search) {
483 dev_dbg(dev, "Failed to find regulator container node '%s'\n",
484 desc->regulators_node);
485 return NULL;
486 }
487
488 for_each_available_child_of_node(search, child) {
489 name = of_get_property(child, "regulator-compatible", NULL);
490 if (!name) {
491 if (!desc->of_match_full_name)
492 name = child->name;
493 else
494 name = child->full_name;
495 }
496
497 if (!strcmp(desc->of_match, name)) {
498 of_node_put(search);
499 /*
500 * 'of_node_get(child)' is already performed by the
501 * for_each loop.
502 */
503 return child;
504 }
505 }
506
507 of_node_put(search);
508
509 return NULL;
510 }
511
regulator_of_get_init_data(struct device * dev,const struct regulator_desc * desc,struct regulator_config * config,struct device_node ** node)512 struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
513 const struct regulator_desc *desc,
514 struct regulator_config *config,
515 struct device_node **node)
516 {
517 struct device_node *child;
518 struct regulator_init_data *init_data = NULL;
519
520 child = regulator_of_get_init_node(config->dev, desc);
521 if (!child)
522 return NULL;
523
524 init_data = of_get_regulator_init_data(dev, child, desc);
525 if (!init_data) {
526 dev_err(dev, "failed to parse DT for regulator %pOFn\n", child);
527 goto error;
528 }
529
530 if (desc->of_parse_cb) {
531 int ret;
532
533 ret = desc->of_parse_cb(child, desc, config);
534 if (ret) {
535 if (ret == -EPROBE_DEFER) {
536 of_node_put(child);
537 return ERR_PTR(-EPROBE_DEFER);
538 }
539 dev_err(dev,
540 "driver callback failed to parse DT for regulator %pOFn\n",
541 child);
542 goto error;
543 }
544 }
545
546 *node = child;
547
548 return init_data;
549
550 error:
551 of_node_put(child);
552
553 return NULL;
554 }
555
of_find_regulator_by_node(struct device_node * np)556 struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
557 {
558 struct device *dev;
559
560 dev = class_find_device_by_of_node(®ulator_class, np);
561
562 return dev ? dev_to_rdev(dev) : NULL;
563 }
564
565 /*
566 * Returns number of regulators coupled with rdev.
567 */
of_get_n_coupled(struct regulator_dev * rdev)568 int of_get_n_coupled(struct regulator_dev *rdev)
569 {
570 struct device_node *node = rdev->dev.of_node;
571 int n_phandles;
572
573 n_phandles = of_count_phandle_with_args(node,
574 "regulator-coupled-with",
575 NULL);
576
577 return (n_phandles > 0) ? n_phandles : 0;
578 }
579
580 /* Looks for "to_find" device_node in src's "regulator-coupled-with" property */
of_coupling_find_node(struct device_node * src,struct device_node * to_find,int * index)581 static bool of_coupling_find_node(struct device_node *src,
582 struct device_node *to_find,
583 int *index)
584 {
585 int n_phandles, i;
586 bool found = false;
587
588 n_phandles = of_count_phandle_with_args(src,
589 "regulator-coupled-with",
590 NULL);
591
592 for (i = 0; i < n_phandles; i++) {
593 struct device_node *tmp = of_parse_phandle(src,
594 "regulator-coupled-with", i);
595
596 if (!tmp)
597 break;
598
599 /* found */
600 if (tmp == to_find)
601 found = true;
602
603 of_node_put(tmp);
604
605 if (found) {
606 *index = i;
607 break;
608 }
609 }
610
611 return found;
612 }
613
614 /**
615 * of_check_coupling_data - Parse rdev's coupling properties and check data
616 * consistency
617 * @rdev: pointer to regulator_dev whose data is checked
618 *
619 * Function checks if all the following conditions are met:
620 * - rdev's max_spread is greater than 0
621 * - all coupled regulators have the same max_spread
622 * - all coupled regulators have the same number of regulator_dev phandles
623 * - all regulators are linked to each other
624 *
625 * Returns true if all conditions are met.
626 */
of_check_coupling_data(struct regulator_dev * rdev)627 bool of_check_coupling_data(struct regulator_dev *rdev)
628 {
629 struct device_node *node = rdev->dev.of_node;
630 int n_phandles = of_get_n_coupled(rdev);
631 struct device_node *c_node;
632 int index;
633 int i;
634 bool ret = true;
635
636 /* iterate over rdev's phandles */
637 for (i = 0; i < n_phandles; i++) {
638 int max_spread = rdev->constraints->max_spread[i];
639 int c_max_spread, c_n_phandles;
640
641 if (max_spread <= 0) {
642 dev_err(&rdev->dev, "max_spread value invalid\n");
643 return false;
644 }
645
646 c_node = of_parse_phandle(node,
647 "regulator-coupled-with", i);
648
649 if (!c_node)
650 ret = false;
651
652 c_n_phandles = of_count_phandle_with_args(c_node,
653 "regulator-coupled-with",
654 NULL);
655
656 if (c_n_phandles != n_phandles) {
657 dev_err(&rdev->dev, "number of coupled reg phandles mismatch\n");
658 ret = false;
659 goto clean;
660 }
661
662 if (!of_coupling_find_node(c_node, node, &index)) {
663 dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
664 ret = false;
665 goto clean;
666 }
667
668 if (of_property_read_u32_index(c_node, "regulator-coupled-max-spread",
669 index, &c_max_spread)) {
670 ret = false;
671 goto clean;
672 }
673
674 if (c_max_spread != max_spread) {
675 dev_err(&rdev->dev,
676 "coupled regulators max_spread mismatch\n");
677 ret = false;
678 goto clean;
679 }
680
681 clean:
682 of_node_put(c_node);
683 if (!ret)
684 break;
685 }
686
687 return ret;
688 }
689
690 /**
691 * of_parse_coupled_regulator() - Get regulator_dev pointer from rdev's property
692 * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse
693 * "regulator-coupled-with" property
694 * @index: Index in phandles array
695 *
696 * Returns the regulator_dev pointer parsed from DTS. If it has not been yet
697 * registered, returns NULL
698 */
of_parse_coupled_regulator(struct regulator_dev * rdev,int index)699 struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,
700 int index)
701 {
702 struct device_node *node = rdev->dev.of_node;
703 struct device_node *c_node;
704 struct regulator_dev *c_rdev;
705
706 c_node = of_parse_phandle(node, "regulator-coupled-with", index);
707 if (!c_node)
708 return NULL;
709
710 c_rdev = of_find_regulator_by_node(c_node);
711
712 of_node_put(c_node);
713
714 return c_rdev;
715 }
716
717 /*
718 * Check if name is a supply name according to the '*-supply' pattern
719 * return 0 if false
720 * return length of supply name without the -supply
721 */
is_supply_name(const char * name)722 static int is_supply_name(const char *name)
723 {
724 int strs, i;
725
726 strs = strlen(name);
727 /* string need to be at minimum len(x-supply) */
728 if (strs < 8)
729 return 0;
730 for (i = strs - 6; i > 0; i--) {
731 /* find first '-' and check if right part is supply */
732 if (name[i] != '-')
733 continue;
734 if (strcmp(name + i + 1, "supply") != 0)
735 return 0;
736 return i;
737 }
738 return 0;
739 }
740
741 /*
742 * of_regulator_bulk_get_all - get multiple regulator consumers
743 *
744 * @dev: Device to supply
745 * @np: device node to search for consumers
746 * @consumers: Configuration of consumers; clients are stored here.
747 *
748 * @return number of regulators on success, an errno on failure.
749 *
750 * This helper function allows drivers to get several regulator
751 * consumers in one operation. If any of the regulators cannot be
752 * acquired then any regulators that were allocated will be freed
753 * before returning to the caller.
754 */
of_regulator_bulk_get_all(struct device * dev,struct device_node * np,struct regulator_bulk_data ** consumers)755 int of_regulator_bulk_get_all(struct device *dev, struct device_node *np,
756 struct regulator_bulk_data **consumers)
757 {
758 int num_consumers = 0;
759 struct regulator *tmp;
760 struct property *prop;
761 int i, n = 0, ret;
762 char name[64];
763
764 *consumers = NULL;
765
766 /*
767 * first pass: get numbers of xxx-supply
768 * second pass: fill consumers
769 */
770 restart:
771 for_each_property_of_node(np, prop) {
772 i = is_supply_name(prop->name);
773 if (i == 0)
774 continue;
775 if (!*consumers) {
776 num_consumers++;
777 continue;
778 } else {
779 memcpy(name, prop->name, i);
780 name[i] = '\0';
781 tmp = regulator_get(dev, name);
782 if (IS_ERR(tmp)) {
783 ret = PTR_ERR(tmp);
784 goto error;
785 }
786 (*consumers)[n].consumer = tmp;
787 n++;
788 continue;
789 }
790 }
791 if (*consumers)
792 return num_consumers;
793 if (num_consumers == 0)
794 return 0;
795 *consumers = kmalloc_array(num_consumers,
796 sizeof(struct regulator_bulk_data),
797 GFP_KERNEL);
798 if (!*consumers)
799 return -ENOMEM;
800 goto restart;
801
802 error:
803 while (--n >= 0)
804 regulator_put(consumers[n]->consumer);
805 return ret;
806 }
807 EXPORT_SYMBOL_GPL(of_regulator_bulk_get_all);
808