915 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OF helpers for regulator framework4 *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 else30 *limit = val;31 else32 *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(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 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, "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 constraints->system_critical = of_property_read_bool(np,135 "system-critical-regulator");136 137 if (of_property_read_bool(np, "regulator-allow-bypass"))138 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;139 140 if (of_property_read_bool(np, "regulator-allow-set-load"))141 constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;142 143 ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);144 if (!ret) {145 if (pval)146 constraints->ramp_delay = pval;147 else148 constraints->ramp_disable = true;149 }150 151 ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);152 if (!ret)153 constraints->settling_time = pval;154 155 ret = of_property_read_u32(np, "regulator-settling-time-up-us", &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, "regulator-settling-time-down-us",165 &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, "regulator-enable-ramp-delay", &pval);175 if (!ret)176 constraints->enable_time = pval;177 178 ret = of_property_read_u32(np, "regulator-uv-survival-time-ms", &pval);179 if (!ret)180 constraints->uv_less_critical_window_ms = pval;181 else182 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 "regulator-soft-start");187 ret = of_property_read_u32(np, "regulator-active-discharge", &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, "regulator-initial-mode", &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 else200 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, "regulator-allowed-modes",208 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 "regulator-allowed-modes", i, &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 else224 constraints->valid_modes_mask |= mode;225 }226 if (constraints->valid_modes_mask)227 constraints->valid_ops_mask228 |= 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, "regulator-system-load", &pval))235 constraints->system_load = pval;236 237 if (n_phandles) {238 constraints->max_spread = devm_kzalloc(dev,239 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, "regulator-coupled-max-spread",246 constraints->max_spread, n_phandles);247 }248 249 if (!of_property_read_u32(np, "regulator-max-step-microvolt",250 &pval))251 constraints->max_uV_step = pval;252 253 constraints->over_current_protection = of_property_read_bool(np,254 "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(np, regulator_states[i]);276 if (!suspend_np)277 continue;278 if (!suspend_state) {279 of_node_put(suspend_np);280 continue;281 }282 283 if (!of_property_read_u32(suspend_np, "regulator-mode",284 &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 else291 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(suspend_np,299 "regulator-on-in-suspend"))300 suspend_state->enabled = ENABLE_IN_SUSPEND;301 else if (of_property_read_bool(suspend_np,302 "regulator-off-in-suspend"))303 suspend_state->enabled = DISABLE_IN_SUSPEND;304 305 if (!of_property_read_u32(suspend_np,306 "regulator-suspend-min-microvolt", &pval))307 suspend_state->min_uV = pval;308 309 if (!of_property_read_u32(suspend_np,310 "regulator-suspend-max-microvolt", &pval))311 suspend_state->max_uV = pval;312 313 if (!of_property_read_u32(suspend_np,314 "regulator-suspend-microvolt", &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(suspend_np,320 "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(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 info336 * @dev: device requesting for regulator_init_data337 * @node: regulator device node338 * @desc: regulator description339 *340 * Populates regulator_init_data structure by extracting data from device341 * tree node.342 *343 * Return: Pointer to a populated &struct regulator_init_data or NULL if344 * memory allocation fails.345 */346struct regulator_init_data *of_get_regulator_init_data(struct device *dev,347 struct device_node *node,348 const struct regulator_desc *desc)349{350 struct regulator_init_data *init_data;351 352 if (!node)353 return NULL;354 355 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);356 if (!init_data)357 return NULL; /* Out of memory? */358 359 if (of_get_regulation_constraints(dev, node, &init_data, desc))360 return NULL;361 362 return init_data;363}364EXPORT_SYMBOL_GPL(of_get_regulator_init_data);365 366struct devm_of_regulator_matches {367 struct of_regulator_match *matches;368 unsigned int num_matches;369};370 371static void devm_of_regulator_put_matches(struct device *dev, void *res)372{373 struct devm_of_regulator_matches *devm_matches = res;374 int i;375 376 for (i = 0; i < devm_matches->num_matches; i++)377 of_node_put(devm_matches->matches[i].of_node);378}379 380/**381 * of_regulator_match - extract multiple regulator init data from device tree.382 * @dev: device requesting the data383 * @node: parent device node of the regulators384 * @matches: match table for the regulators385 * @num_matches: number of entries in match table386 *387 * This function uses a match table specified by the regulator driver to388 * parse regulator init data from the device tree. @node is expected to389 * contain a set of child nodes, each providing the init data for one390 * regulator. The data parsed from a child node will be matched to a regulator391 * based on either the deprecated property regulator-compatible if present,392 * or otherwise the child node's name. Note that the match table is modified393 * in place and an additional of_node reference is taken for each matched394 * regulator.395 *396 * Return: The number of matches found or a negative error number on failure.397 */398int of_regulator_match(struct device *dev, struct device_node *node,399 struct of_regulator_match *matches,400 unsigned int num_matches)401{402 unsigned int count = 0;403 unsigned int i;404 const char *name;405 struct device_node *child;406 struct devm_of_regulator_matches *devm_matches;407 408 if (!dev || !node)409 return -EINVAL;410 411 devm_matches = devres_alloc(devm_of_regulator_put_matches,412 sizeof(struct devm_of_regulator_matches),413 GFP_KERNEL);414 if (!devm_matches)415 return -ENOMEM;416 417 devm_matches->matches = matches;418 devm_matches->num_matches = num_matches;419 420 devres_add(dev, devm_matches);421 422 for (i = 0; i < num_matches; i++) {423 struct of_regulator_match *match = &matches[i];424 match->init_data = NULL;425 match->of_node = NULL;426 }427 428 for_each_child_of_node(node, child) {429 name = of_get_property(child,430 "regulator-compatible", NULL);431 if (!name)432 name = child->name;433 for (i = 0; i < num_matches; i++) {434 struct of_regulator_match *match = &matches[i];435 if (match->of_node)436 continue;437 438 if (strcmp(match->name, name))439 continue;440 441 match->init_data =442 of_get_regulator_init_data(dev, child,443 match->desc);444 if (!match->init_data) {445 dev_err(dev,446 "failed to parse DT for regulator %pOFn\n",447 child);448 of_node_put(child);449 return -EINVAL;450 }451 match->of_node = of_node_get(child);452 count++;453 break;454 }455 }456 457 return count;458}459EXPORT_SYMBOL_GPL(of_regulator_match);460 461static struct462device_node *regulator_of_get_init_node(struct device *dev,463 const struct regulator_desc *desc)464{465 struct device_node *search, *child;466 const char *name;467 468 if (!dev->of_node || !desc->of_match)469 return NULL;470 471 if (desc->regulators_node) {472 search = of_get_child_by_name(dev->of_node,473 desc->regulators_node);474 } else {475 search = of_node_get(dev->of_node);476 477 if (!strcmp(desc->of_match, search->name))478 return search;479 }480 481 if (!search) {482 dev_dbg(dev, "Failed to find regulator container node '%s'\n",483 desc->regulators_node);484 return NULL;485 }486 487 for_each_available_child_of_node(search, child) {488 name = of_get_property(child, "regulator-compatible", NULL);489 if (!name) {490 if (!desc->of_match_full_name)491 name = child->name;492 else493 name = child->full_name;494 }495 496 if (!strcmp(desc->of_match, name)) {497 of_node_put(search);498 /*499 * 'of_node_get(child)' is already performed by the500 * for_each loop.501 */502 return child;503 }504 }505 506 of_node_put(search);507 508 return NULL;509}510 511struct regulator_init_data *regulator_of_get_init_data(struct device *dev,512 const struct regulator_desc *desc,513 struct regulator_config *config,514 struct device_node **node)515{516 struct device_node *child;517 struct regulator_init_data *init_data = NULL;518 519 child = regulator_of_get_init_node(config->dev, desc);520 if (!child)521 return NULL;522 523 init_data = of_get_regulator_init_data(dev, child, desc);524 if (!init_data) {525 dev_err(dev, "failed to parse DT for regulator %pOFn\n", child);526 goto error;527 }528 529 if (desc->of_parse_cb) {530 int ret;531 532 ret = desc->of_parse_cb(child, desc, config);533 if (ret) {534 if (ret == -EPROBE_DEFER) {535 of_node_put(child);536 return ERR_PTR(-EPROBE_DEFER);537 }538 dev_err(dev,539 "driver callback failed to parse DT for regulator %pOFn\n",540 child);541 goto error;542 }543 }544 545 *node = child;546 547 return init_data;548 549error:550 of_node_put(child);551 552 return NULL;553}554 555/**556 * of_get_child_regulator - get a child regulator device node557 * based on supply name558 * @parent: Parent device node559 * @prop_name: Combination regulator supply name and "-supply"560 *561 * Traverse all child nodes.562 * Extract the child regulator device node corresponding to the supply name.563 *564 * Return: Pointer to the &struct device_node corresponding to the regulator565 * if found, or %NULL if not found.566 */567static struct device_node *of_get_child_regulator(struct device_node *parent,568 const char *prop_name)569{570 struct device_node *regnode = NULL;571 struct device_node *child = NULL;572 573 for_each_child_of_node(parent, child) {574 regnode = of_parse_phandle(child, prop_name, 0);575 if (regnode)576 goto err_node_put;577 578 regnode = of_get_child_regulator(child, prop_name);579 if (regnode)580 goto err_node_put;581 }582 return NULL;583 584err_node_put:585 of_node_put(child);586 return regnode;587}588 589/**590 * of_get_regulator - get a regulator device node based on supply name591 * @dev: Device pointer for the consumer (of regulator) device592 * @supply: regulator supply name593 *594 * Extract the regulator device node corresponding to the supply name.595 *596 * Return: Pointer to the &struct device_node corresponding to the regulator597 * if found, or %NULL if not found.598 */599static struct device_node *of_get_regulator(struct device *dev, const char *supply)600{601 struct device_node *regnode = NULL;602 char prop_name[64]; /* 64 is max size of property name */603 604 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);605 606 snprintf(prop_name, 64, "%s-supply", supply);607 regnode = of_parse_phandle(dev->of_node, prop_name, 0);608 if (regnode)609 return regnode;610 611 regnode = of_get_child_regulator(dev->of_node, prop_name);612 if (regnode)613 return regnode;614 615 dev_dbg(dev, "Looking up %s property in node %pOF failed\n", prop_name, dev->of_node);616 return NULL;617}618 619static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)620{621 struct device *dev;622 623 dev = class_find_device_by_of_node(®ulator_class, np);624 625 return dev ? dev_to_rdev(dev) : NULL;626}627 628/**629 * of_regulator_dev_lookup - lookup a regulator device with device tree only630 * @dev: Device pointer for regulator supply lookup.631 * @supply: Supply name or regulator ID.632 *633 * Return: Pointer to the &struct regulator_dev on success, or ERR_PTR()634 * encoded value on error.635 *636 * If successful, returns a pointer to the &struct regulator_dev that637 * corresponds to the name @supply and with the embedded &struct device638 * refcount incremented by one. The refcount must be dropped by calling639 * put_device().640 *641 * On failure one of the following ERR_PTR() encoded values is returned:642 * * -%ENODEV if lookup fails permanently.643 * * -%EPROBE_DEFER if lookup could succeed in the future.644 */645struct regulator_dev *of_regulator_dev_lookup(struct device *dev,646 const char *supply)647{648 struct regulator_dev *r;649 struct device_node *node;650 651 node = of_get_regulator(dev, supply);652 if (node) {653 r = of_find_regulator_by_node(node);654 of_node_put(node);655 if (r)656 return r;657 658 /*659 * We have a node, but there is no device.660 * assume it has not registered yet.661 */662 return ERR_PTR(-EPROBE_DEFER);663 }664 665 return ERR_PTR(-ENODEV);666}667 668/*669 * Returns number of regulators coupled with rdev.670 */671int of_get_n_coupled(struct regulator_dev *rdev)672{673 struct device_node *node = rdev->dev.of_node;674 int n_phandles;675 676 n_phandles = of_count_phandle_with_args(node,677 "regulator-coupled-with",678 NULL);679 680 return (n_phandles > 0) ? n_phandles : 0;681}682 683/* Looks for "to_find" device_node in src's "regulator-coupled-with" property */684static bool of_coupling_find_node(struct device_node *src,685 struct device_node *to_find,686 int *index)687{688 int n_phandles, i;689 bool found = false;690 691 n_phandles = of_count_phandle_with_args(src,692 "regulator-coupled-with",693 NULL);694 695 for (i = 0; i < n_phandles; i++) {696 struct device_node *tmp = of_parse_phandle(src,697 "regulator-coupled-with", i);698 699 if (!tmp)700 break;701 702 /* found */703 if (tmp == to_find)704 found = true;705 706 of_node_put(tmp);707 708 if (found) {709 *index = i;710 break;711 }712 }713 714 return found;715}716 717/**718 * of_check_coupling_data - Parse rdev's coupling properties and check data719 * consistency720 * @rdev: pointer to regulator_dev whose data is checked721 *722 * Function checks if all the following conditions are met:723 * - rdev's max_spread is greater than 0724 * - all coupled regulators have the same max_spread725 * - all coupled regulators have the same number of regulator_dev phandles726 * - all regulators are linked to each other727 *728 * Return: True if all conditions are met; false otherwise.729 */730bool of_check_coupling_data(struct regulator_dev *rdev)731{732 struct device_node *node = rdev->dev.of_node;733 int n_phandles = of_get_n_coupled(rdev);734 struct device_node *c_node;735 int index;736 int i;737 bool ret = true;738 739 /* iterate over rdev's phandles */740 for (i = 0; i < n_phandles; i++) {741 int max_spread = rdev->constraints->max_spread[i];742 int c_max_spread, c_n_phandles;743 744 if (max_spread <= 0) {745 dev_err(&rdev->dev, "max_spread value invalid\n");746 return false;747 }748 749 c_node = of_parse_phandle(node,750 "regulator-coupled-with", i);751 752 if (!c_node)753 ret = false;754 755 c_n_phandles = of_count_phandle_with_args(c_node,756 "regulator-coupled-with",757 NULL);758 759 if (c_n_phandles != n_phandles) {760 dev_err(&rdev->dev, "number of coupled reg phandles mismatch\n");761 ret = false;762 goto clean;763 }764 765 if (!of_coupling_find_node(c_node, node, &index)) {766 dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");767 ret = false;768 goto clean;769 }770 771 if (of_property_read_u32_index(c_node, "regulator-coupled-max-spread",772 index, &c_max_spread)) {773 ret = false;774 goto clean;775 }776 777 if (c_max_spread != max_spread) {778 dev_err(&rdev->dev,779 "coupled regulators max_spread mismatch\n");780 ret = false;781 goto clean;782 }783 784clean:785 of_node_put(c_node);786 if (!ret)787 break;788 }789 790 return ret;791}792 793/**794 * of_parse_coupled_regulator() - Get regulator_dev pointer from rdev's property795 * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse796 * "regulator-coupled-with" property797 * @index: Index in phandles array798 *799 * Return: Pointer to the &struct regulator_dev parsed from DTS, or %NULL if800 * it has not yet been registered.801 */802struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,803 int index)804{805 struct device_node *node = rdev->dev.of_node;806 struct device_node *c_node;807 struct regulator_dev *c_rdev;808 809 c_node = of_parse_phandle(node, "regulator-coupled-with", index);810 if (!c_node)811 return NULL;812 813 c_rdev = of_find_regulator_by_node(c_node);814 815 of_node_put(c_node);816 817 return c_rdev;818}819 820/*821 * Check if name is a supply name according to the '*-supply' pattern822 * return 0 if false823 * return length of supply name without the -supply824 */825static int is_supply_name(const char *name)826{827 int strs, i;828 829 strs = strlen(name);830 /* string need to be at minimum len(x-supply) */831 if (strs < 8)832 return 0;833 for (i = strs - 6; i > 0; i--) {834 /* find first '-' and check if right part is supply */835 if (name[i] != '-')836 continue;837 if (strcmp(name + i + 1, "supply") != 0)838 return 0;839 return i;840 }841 return 0;842}843 844/**845 * of_regulator_bulk_get_all - get multiple regulator consumers846 *847 * @dev: Device to supply848 * @np: device node to search for consumers849 * @consumers: Configuration of consumers; clients are stored here.850 *851 * This helper function allows drivers to get several regulator852 * consumers in one operation. If any of the regulators cannot be853 * acquired then any regulators that were allocated will be freed854 * before returning to the caller, and @consumers will not be855 * changed.856 *857 * Return: Number of regulators on success, or a negative error number858 * on failure.859 */860int of_regulator_bulk_get_all(struct device *dev, struct device_node *np,861 struct regulator_bulk_data **consumers)862{863 int num_consumers = 0;864 struct regulator *tmp;865 struct regulator_bulk_data *_consumers = NULL;866 struct property *prop;867 int i, n = 0, ret;868 char name[64];869 870 /*871 * first pass: get numbers of xxx-supply872 * second pass: fill consumers873 */874restart:875 for_each_property_of_node(np, prop) {876 i = is_supply_name(prop->name);877 if (i == 0)878 continue;879 if (!_consumers) {880 num_consumers++;881 continue;882 } else {883 memcpy(name, prop->name, i);884 name[i] = '\0';885 tmp = regulator_get(dev, name);886 if (IS_ERR(tmp)) {887 ret = PTR_ERR(tmp);888 goto error;889 }890 _consumers[n].consumer = tmp;891 n++;892 continue;893 }894 }895 if (_consumers) {896 *consumers = _consumers;897 return num_consumers;898 }899 if (num_consumers == 0)900 return 0;901 _consumers = kmalloc_array(num_consumers,902 sizeof(struct regulator_bulk_data),903 GFP_KERNEL);904 if (!_consumers)905 return -ENOMEM;906 goto restart;907 908error:909 while (--n >= 0)910 regulator_put(_consumers[n].consumer);911 kfree(_consumers);912 return ret;913}914EXPORT_SYMBOL_GPL(of_regulator_bulk_get_all);915