Commit | Line | Data |
---|---|---|
8f446e6f RN |
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 | ||
e69af5e9 | 13 | #include <linux/module.h> |
8f446e6f RN |
14 | #include <linux/slab.h> |
15 | #include <linux/of.h> | |
16 | #include <linux/regulator/machine.h> | |
a0c7b164 | 17 | #include <linux/regulator/driver.h> |
1c8fa58f | 18 | #include <linux/regulator/of_regulator.h> |
8f446e6f | 19 | |
a0c7b164 MB |
20 | #include "internal.h" |
21 | ||
f32fa89c | 22 | static const char *const regulator_states[PM_SUSPEND_MAX + 1] = { |
40e20d68 CC |
23 | [PM_SUSPEND_MEM] = "regulator-state-mem", |
24 | [PM_SUSPEND_MAX] = "regulator-state-disk", | |
25 | }; | |
26 | ||
8f446e6f | 27 | static void of_get_regulation_constraints(struct device_node *np, |
5e5e3a42 JMC |
28 | struct regulator_init_data **init_data, |
29 | const struct regulator_desc *desc) | |
8f446e6f | 30 | { |
8f446e6f | 31 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
40e20d68 CC |
32 | struct regulator_state *suspend_state; |
33 | struct device_node *suspend_np; | |
02f37039 | 34 | unsigned int mode; |
54557ad9 | 35 | int ret, i, len; |
00c877c6 | 36 | u32 pval; |
8f446e6f RN |
37 | |
38 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
39 | ||
a34785f1 LD |
40 | if (!of_property_read_u32(np, "regulator-min-microvolt", &pval)) |
41 | constraints->min_uV = pval; | |
42 | ||
43 | if (!of_property_read_u32(np, "regulator-max-microvolt", &pval)) | |
44 | constraints->max_uV = pval; | |
8f446e6f RN |
45 | |
46 | /* Voltage change possible? */ | |
45fa2038 | 47 | if (constraints->min_uV != constraints->max_uV) |
8f446e6f | 48 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; |
45fa2038 MB |
49 | |
50 | /* Do we have a voltage range, if so try to apply it? */ | |
51 | if (constraints->min_uV && constraints->max_uV) | |
ab62aa93 | 52 | constraints->apply_uV = true; |
8f446e6f | 53 | |
1e050eab SS |
54 | if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval)) |
55 | constraints->uV_offset = pval; | |
56 | if (!of_property_read_u32(np, "regulator-min-microamp", &pval)) | |
57 | constraints->min_uA = pval; | |
58 | if (!of_property_read_u32(np, "regulator-max-microamp", &pval)) | |
59 | constraints->max_uA = pval; | |
8f446e6f | 60 | |
36e4f839 SB |
61 | if (!of_property_read_u32(np, "regulator-input-current-limit-microamp", |
62 | &pval)) | |
63 | constraints->ilim_uA = pval; | |
64 | ||
8f446e6f RN |
65 | /* Current change possible? */ |
66 | if (constraints->min_uA != constraints->max_uA) | |
67 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
68 | ||
1e050eab SS |
69 | constraints->boot_on = of_property_read_bool(np, "regulator-boot-on"); |
70 | constraints->always_on = of_property_read_bool(np, "regulator-always-on"); | |
71 | if (!constraints->always_on) /* status change should be possible. */ | |
8f446e6f | 72 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
6f0b2c69 | 73 | |
23c779b9 SB |
74 | constraints->pull_down = of_property_read_bool(np, "regulator-pull-down"); |
75 | ||
93134c7b KVA |
76 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
77 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
78 | ||
b263d203 BA |
79 | if (of_property_read_bool(np, "regulator-allow-set-load")) |
80 | constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS; | |
81 | ||
1e050eab SS |
82 | ret = of_property_read_u32(np, "regulator-ramp-delay", &pval); |
83 | if (!ret) { | |
84 | if (pval) | |
85 | constraints->ramp_delay = pval; | |
1653ccf4 YSB |
86 | else |
87 | constraints->ramp_disable = true; | |
88 | } | |
00c877c6 | 89 | |
d6c1dc3f LD |
90 | ret = of_property_read_u32(np, "regulator-settling-time-us", &pval); |
91 | if (!ret) | |
92 | constraints->settling_time = pval; | |
93 | ||
3ffad468 MK |
94 | ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval); |
95 | if (!ret) | |
96 | constraints->settling_time_up = pval; | |
97 | if (constraints->settling_time_up && constraints->settling_time) { | |
98 | pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n", | |
99 | np->name); | |
100 | constraints->settling_time_up = 0; | |
101 | } | |
102 | ||
103 | ret = of_property_read_u32(np, "regulator-settling-time-down-us", | |
104 | &pval); | |
105 | if (!ret) | |
106 | constraints->settling_time_down = pval; | |
107 | if (constraints->settling_time_down && constraints->settling_time) { | |
108 | pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n", | |
109 | np->name); | |
110 | constraints->settling_time_down = 0; | |
111 | } | |
112 | ||
00c877c6 LD |
113 | ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); |
114 | if (!ret) | |
115 | constraints->enable_time = pval; | |
40e20d68 | 116 | |
57f66b78 SB |
117 | constraints->soft_start = of_property_read_bool(np, |
118 | "regulator-soft-start"); | |
670666b9 LD |
119 | ret = of_property_read_u32(np, "regulator-active-discharge", &pval); |
120 | if (!ret) { | |
121 | constraints->active_discharge = | |
122 | (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE : | |
123 | REGULATOR_ACTIVE_DISCHARGE_DISABLE; | |
124 | } | |
57f66b78 | 125 | |
5e5e3a42 JMC |
126 | if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) { |
127 | if (desc && desc->of_map_mode) { | |
02f37039 DA |
128 | mode = desc->of_map_mode(pval); |
129 | if (mode == REGULATOR_MODE_INVALID) | |
5e5e3a42 JMC |
130 | pr_err("%s: invalid mode %u\n", np->name, pval); |
131 | else | |
02f37039 | 132 | constraints->initial_mode = mode; |
5e5e3a42 JMC |
133 | } else { |
134 | pr_warn("%s: mapping for mode %d not defined\n", | |
135 | np->name, pval); | |
136 | } | |
137 | } | |
138 | ||
54557ad9 DC |
139 | len = of_property_count_elems_of_size(np, "regulator-allowed-modes", |
140 | sizeof(u32)); | |
141 | if (len > 0) { | |
142 | if (desc && desc->of_map_mode) { | |
143 | for (i = 0; i < len; i++) { | |
144 | ret = of_property_read_u32_index(np, | |
145 | "regulator-allowed-modes", i, &pval); | |
146 | if (ret) { | |
147 | pr_err("%s: couldn't read allowed modes index %d, ret=%d\n", | |
148 | np->name, i, ret); | |
149 | break; | |
150 | } | |
151 | mode = desc->of_map_mode(pval); | |
152 | if (mode == REGULATOR_MODE_INVALID) | |
153 | pr_err("%s: invalid regulator-allowed-modes element %u\n", | |
154 | np->name, pval); | |
155 | else | |
156 | constraints->valid_modes_mask |= mode; | |
157 | } | |
158 | if (constraints->valid_modes_mask) | |
159 | constraints->valid_ops_mask | |
160 | |= REGULATOR_CHANGE_MODE; | |
161 | } else { | |
162 | pr_warn("%s: mode mapping not defined\n", np->name); | |
163 | } | |
164 | } | |
165 | ||
22a10bca SB |
166 | if (!of_property_read_u32(np, "regulator-system-load", &pval)) |
167 | constraints->system_load = pval; | |
168 | ||
a085a31a MP |
169 | if (!of_property_read_u32(np, "regulator-coupled-max-spread", |
170 | &pval)) | |
171 | constraints->max_spread = pval; | |
172 | ||
3a003bae SB |
173 | constraints->over_current_protection = of_property_read_bool(np, |
174 | "regulator-over-current-protection"); | |
175 | ||
40e20d68 CC |
176 | for (i = 0; i < ARRAY_SIZE(regulator_states); i++) { |
177 | switch (i) { | |
178 | case PM_SUSPEND_MEM: | |
179 | suspend_state = &constraints->state_mem; | |
180 | break; | |
181 | case PM_SUSPEND_MAX: | |
182 | suspend_state = &constraints->state_disk; | |
183 | break; | |
184 | case PM_SUSPEND_ON: | |
690cbb90 | 185 | case PM_SUSPEND_TO_IDLE: |
40e20d68 CC |
186 | case PM_SUSPEND_STANDBY: |
187 | default: | |
188 | continue; | |
7cf225b9 | 189 | } |
40e20d68 CC |
190 | |
191 | suspend_np = of_get_child_by_name(np, regulator_states[i]); | |
192 | if (!suspend_np || !suspend_state) | |
193 | continue; | |
194 | ||
5e5e3a42 JMC |
195 | if (!of_property_read_u32(suspend_np, "regulator-mode", |
196 | &pval)) { | |
197 | if (desc && desc->of_map_mode) { | |
02f37039 DA |
198 | mode = desc->of_map_mode(pval); |
199 | if (mode == REGULATOR_MODE_INVALID) | |
5e5e3a42 JMC |
200 | pr_err("%s: invalid mode %u\n", |
201 | np->name, pval); | |
202 | else | |
02f37039 | 203 | suspend_state->mode = mode; |
5e5e3a42 JMC |
204 | } else { |
205 | pr_warn("%s: mapping for mode %d not defined\n", | |
206 | np->name, pval); | |
207 | } | |
208 | } | |
209 | ||
40e20d68 CC |
210 | if (of_property_read_bool(suspend_np, |
211 | "regulator-on-in-suspend")) | |
72069f99 | 212 | suspend_state->enabled = ENABLE_IN_SUSPEND; |
40e20d68 CC |
213 | else if (of_property_read_bool(suspend_np, |
214 | "regulator-off-in-suspend")) | |
72069f99 CZ |
215 | suspend_state->enabled = DISABLE_IN_SUSPEND; |
216 | else | |
217 | suspend_state->enabled = DO_NOTHING_IN_SUSPEND; | |
40e20d68 | 218 | |
f7efad10 CZ |
219 | if (!of_property_read_u32(np, "regulator-suspend-min-microvolt", |
220 | &pval)) | |
221 | suspend_state->min_uV = pval; | |
222 | ||
223 | if (!of_property_read_u32(np, "regulator-suspend-max-microvolt", | |
224 | &pval)) | |
225 | suspend_state->max_uV = pval; | |
40e20d68 | 226 | |
8cbcaea8 DA |
227 | if (!of_property_read_u32(suspend_np, |
228 | "regulator-suspend-microvolt", &pval)) | |
229 | suspend_state->uV = pval; | |
f7efad10 CZ |
230 | else /* otherwise use min_uV as default suspend voltage */ |
231 | suspend_state->uV = suspend_state->min_uV; | |
232 | ||
233 | if (of_property_read_bool(suspend_np, | |
234 | "regulator-changeable-in-suspend")) | |
235 | suspend_state->changeable = true; | |
8cbcaea8 | 236 | |
a0f78bc8 K |
237 | if (i == PM_SUSPEND_MEM) |
238 | constraints->initial_state = PM_SUSPEND_MEM; | |
239 | ||
4eafec83 | 240 | of_node_put(suspend_np); |
40e20d68 CC |
241 | suspend_state = NULL; |
242 | suspend_np = NULL; | |
243 | } | |
8f446e6f RN |
244 | } |
245 | ||
246 | /** | |
247 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
248 | * @dev: device requesting for regulator_init_data | |
072e78b1 JMC |
249 | * @node: regulator device node |
250 | * @desc: regulator description | |
8f446e6f RN |
251 | * |
252 | * Populates regulator_init_data structure by extracting data from device | |
253 | * tree node, returns a pointer to the populated struture or NULL if memory | |
254 | * alloc fails. | |
255 | */ | |
d9a861cc | 256 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
072e78b1 JMC |
257 | struct device_node *node, |
258 | const struct regulator_desc *desc) | |
8f446e6f RN |
259 | { |
260 | struct regulator_init_data *init_data; | |
261 | ||
d9a861cc | 262 | if (!node) |
8f446e6f RN |
263 | return NULL; |
264 | ||
265 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
266 | if (!init_data) | |
267 | return NULL; /* Out of memory? */ | |
268 | ||
5e5e3a42 | 269 | of_get_regulation_constraints(node, &init_data, desc); |
8f446e6f RN |
270 | return init_data; |
271 | } | |
e69af5e9 | 272 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f | 273 | |
13b3fde8 CK |
274 | struct devm_of_regulator_matches { |
275 | struct of_regulator_match *matches; | |
276 | unsigned int num_matches; | |
277 | }; | |
278 | ||
279 | static void devm_of_regulator_put_matches(struct device *dev, void *res) | |
280 | { | |
281 | struct devm_of_regulator_matches *devm_matches = res; | |
282 | int i; | |
283 | ||
284 | for (i = 0; i < devm_matches->num_matches; i++) | |
285 | of_node_put(devm_matches->matches[i].of_node); | |
286 | } | |
287 | ||
1c8fa58f | 288 | /** |
13511def | 289 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
290 | * @dev: device requesting the data |
291 | * @node: parent device node of the regulators | |
292 | * @matches: match table for the regulators | |
293 | * @num_matches: number of entries in match table | |
294 | * | |
13511def SW |
295 | * This function uses a match table specified by the regulator driver to |
296 | * parse regulator init data from the device tree. @node is expected to | |
297 | * contain a set of child nodes, each providing the init data for one | |
298 | * regulator. The data parsed from a child node will be matched to a regulator | |
299 | * based on either the deprecated property regulator-compatible if present, | |
300 | * or otherwise the child node's name. Note that the match table is modified | |
bd0dda74 CK |
301 | * in place and an additional of_node reference is taken for each matched |
302 | * regulator. | |
1c8fa58f TR |
303 | * |
304 | * Returns the number of matches found or a negative error code on failure. | |
305 | */ | |
306 | int of_regulator_match(struct device *dev, struct device_node *node, | |
307 | struct of_regulator_match *matches, | |
308 | unsigned int num_matches) | |
309 | { | |
310 | unsigned int count = 0; | |
311 | unsigned int i; | |
13511def | 312 | const char *name; |
5260cd2b | 313 | struct device_node *child; |
13b3fde8 | 314 | struct devm_of_regulator_matches *devm_matches; |
1c8fa58f TR |
315 | |
316 | if (!dev || !node) | |
317 | return -EINVAL; | |
318 | ||
13b3fde8 CK |
319 | devm_matches = devres_alloc(devm_of_regulator_put_matches, |
320 | sizeof(struct devm_of_regulator_matches), | |
321 | GFP_KERNEL); | |
322 | if (!devm_matches) | |
323 | return -ENOMEM; | |
324 | ||
325 | devm_matches->matches = matches; | |
326 | devm_matches->num_matches = num_matches; | |
327 | ||
328 | devres_add(dev, devm_matches); | |
329 | ||
a2f95c36 SW |
330 | for (i = 0; i < num_matches; i++) { |
331 | struct of_regulator_match *match = &matches[i]; | |
332 | match->init_data = NULL; | |
333 | match->of_node = NULL; | |
334 | } | |
335 | ||
5260cd2b | 336 | for_each_child_of_node(node, child) { |
13511def | 337 | name = of_get_property(child, |
5260cd2b | 338 | "regulator-compatible", NULL); |
13511def SW |
339 | if (!name) |
340 | name = child->name; | |
5260cd2b LD |
341 | for (i = 0; i < num_matches; i++) { |
342 | struct of_regulator_match *match = &matches[i]; | |
343 | if (match->of_node) | |
344 | continue; | |
345 | ||
13511def | 346 | if (strcmp(match->name, name)) |
5260cd2b LD |
347 | continue; |
348 | ||
349 | match->init_data = | |
75d6b2fa JMC |
350 | of_get_regulator_init_data(dev, child, |
351 | match->desc); | |
5260cd2b LD |
352 | if (!match->init_data) { |
353 | dev_err(dev, | |
354 | "failed to parse DT for regulator %s\n", | |
355 | child->name); | |
30966861 | 356 | of_node_put(child); |
5260cd2b LD |
357 | return -EINVAL; |
358 | } | |
bd0dda74 | 359 | match->of_node = of_node_get(child); |
5260cd2b LD |
360 | count++; |
361 | break; | |
1c8fa58f | 362 | } |
1c8fa58f TR |
363 | } |
364 | ||
365 | return count; | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(of_regulator_match); | |
a0c7b164 MB |
368 | |
369 | struct regulator_init_data *regulator_of_get_init_data(struct device *dev, | |
370 | const struct regulator_desc *desc, | |
bfa21a0d | 371 | struct regulator_config *config, |
a0c7b164 MB |
372 | struct device_node **node) |
373 | { | |
374 | struct device_node *search, *child; | |
375 | struct regulator_init_data *init_data = NULL; | |
376 | const char *name; | |
377 | ||
378 | if (!dev->of_node || !desc->of_match) | |
379 | return NULL; | |
380 | ||
381 | if (desc->regulators_node) | |
382 | search = of_get_child_by_name(dev->of_node, | |
383 | desc->regulators_node); | |
384 | else | |
423a1164 | 385 | search = of_node_get(dev->of_node); |
a0c7b164 MB |
386 | |
387 | if (!search) { | |
7de79a1d MB |
388 | dev_dbg(dev, "Failed to find regulator container node '%s'\n", |
389 | desc->regulators_node); | |
a0c7b164 MB |
390 | return NULL; |
391 | } | |
392 | ||
130daa3f | 393 | for_each_available_child_of_node(search, child) { |
a0c7b164 MB |
394 | name = of_get_property(child, "regulator-compatible", NULL); |
395 | if (!name) | |
396 | name = child->name; | |
397 | ||
398 | if (strcmp(desc->of_match, name)) | |
399 | continue; | |
400 | ||
072e78b1 | 401 | init_data = of_get_regulator_init_data(dev, child, desc); |
a0c7b164 MB |
402 | if (!init_data) { |
403 | dev_err(dev, | |
404 | "failed to parse DT for regulator %s\n", | |
405 | child->name); | |
406 | break; | |
407 | } | |
408 | ||
bfa21a0d KK |
409 | if (desc->of_parse_cb) { |
410 | if (desc->of_parse_cb(child, desc, config)) { | |
411 | dev_err(dev, | |
412 | "driver callback failed to parse DT for regulator %s\n", | |
413 | child->name); | |
414 | init_data = NULL; | |
415 | break; | |
416 | } | |
417 | } | |
418 | ||
a0c7b164 MB |
419 | of_node_get(child); |
420 | *node = child; | |
421 | break; | |
422 | } | |
423 | ||
424 | of_node_put(search); | |
425 | ||
426 | return init_data; | |
427 | } | |
148096af MP |
428 | |
429 | static int of_node_match(struct device *dev, const void *data) | |
430 | { | |
431 | return dev->of_node == data; | |
432 | } | |
433 | ||
434 | struct regulator_dev *of_find_regulator_by_node(struct device_node *np) | |
435 | { | |
436 | struct device *dev; | |
437 | ||
438 | dev = class_find_device(®ulator_class, NULL, np, of_node_match); | |
439 | ||
440 | return dev ? dev_to_rdev(dev) : NULL; | |
441 | } | |
a085a31a MP |
442 | |
443 | /* | |
444 | * Returns number of regulators coupled with rdev. | |
445 | */ | |
446 | int of_get_n_coupled(struct regulator_dev *rdev) | |
447 | { | |
448 | struct device_node *node = rdev->dev.of_node; | |
449 | int n_phandles; | |
450 | ||
451 | n_phandles = of_count_phandle_with_args(node, | |
452 | "regulator-coupled-with", | |
453 | NULL); | |
454 | ||
455 | return (n_phandles > 0) ? n_phandles : 0; | |
456 | } | |
457 | ||
458 | /* Looks for "to_find" device_node in src's "regulator-coupled-with" property */ | |
459 | static bool of_coupling_find_node(struct device_node *src, | |
460 | struct device_node *to_find) | |
461 | { | |
462 | int n_phandles, i; | |
463 | bool found = false; | |
464 | ||
465 | n_phandles = of_count_phandle_with_args(src, | |
466 | "regulator-coupled-with", | |
467 | NULL); | |
468 | ||
469 | for (i = 0; i < n_phandles; i++) { | |
470 | struct device_node *tmp = of_parse_phandle(src, | |
471 | "regulator-coupled-with", i); | |
472 | ||
473 | if (!tmp) | |
474 | break; | |
475 | ||
476 | /* found */ | |
477 | if (tmp == to_find) | |
478 | found = true; | |
479 | ||
480 | of_node_put(tmp); | |
481 | ||
482 | if (found) | |
483 | break; | |
484 | } | |
485 | ||
486 | return found; | |
487 | } | |
488 | ||
489 | /** | |
490 | * of_check_coupling_data - Parse rdev's coupling properties and check data | |
491 | * consistency | |
492 | * @rdev - pointer to regulator_dev whose data is checked | |
493 | * | |
494 | * Function checks if all the following conditions are met: | |
495 | * - rdev's max_spread is greater than 0 | |
496 | * - all coupled regulators have the same max_spread | |
497 | * - all coupled regulators have the same number of regulator_dev phandles | |
498 | * - all regulators are linked to each other | |
499 | * | |
500 | * Returns true if all conditions are met. | |
501 | */ | |
502 | bool of_check_coupling_data(struct regulator_dev *rdev) | |
503 | { | |
504 | int max_spread = rdev->constraints->max_spread; | |
505 | struct device_node *node = rdev->dev.of_node; | |
506 | int n_phandles = of_get_n_coupled(rdev); | |
507 | struct device_node *c_node; | |
508 | int i; | |
509 | bool ret = true; | |
510 | ||
511 | if (max_spread <= 0) { | |
512 | dev_err(&rdev->dev, "max_spread value invalid\n"); | |
513 | return false; | |
514 | } | |
515 | ||
516 | /* iterate over rdev's phandles */ | |
517 | for (i = 0; i < n_phandles; i++) { | |
518 | int c_max_spread, c_n_phandles; | |
519 | ||
520 | c_node = of_parse_phandle(node, | |
521 | "regulator-coupled-with", i); | |
522 | ||
523 | if (!c_node) | |
524 | ret = false; | |
525 | ||
526 | c_n_phandles = of_count_phandle_with_args(c_node, | |
527 | "regulator-coupled-with", | |
528 | NULL); | |
529 | ||
530 | if (c_n_phandles != n_phandles) { | |
531 | dev_err(&rdev->dev, "number of couped reg phandles mismatch\n"); | |
532 | ret = false; | |
533 | goto clean; | |
534 | } | |
535 | ||
536 | if (of_property_read_u32(c_node, "regulator-coupled-max-spread", | |
537 | &c_max_spread)) { | |
538 | ret = false; | |
539 | goto clean; | |
540 | } | |
541 | ||
542 | if (c_max_spread != max_spread) { | |
543 | dev_err(&rdev->dev, | |
544 | "coupled regulators max_spread mismatch\n"); | |
545 | ret = false; | |
546 | goto clean; | |
547 | } | |
548 | ||
549 | if (!of_coupling_find_node(c_node, node)) { | |
550 | dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n"); | |
551 | ret = false; | |
552 | } | |
553 | ||
554 | clean: | |
555 | of_node_put(c_node); | |
556 | if (!ret) | |
557 | break; | |
558 | } | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
563 | /** | |
564 | * of_parse_coupled regulator - Get regulator_dev pointer from rdev's property | |
565 | * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse | |
566 | * "regulator-coupled-with" property | |
567 | * @index: Index in phandles array | |
568 | * | |
569 | * Returns the regulator_dev pointer parsed from DTS. If it has not been yet | |
570 | * registered, returns NULL | |
571 | */ | |
572 | struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev, | |
573 | int index) | |
574 | { | |
575 | struct device_node *node = rdev->dev.of_node; | |
576 | struct device_node *c_node; | |
577 | struct regulator_dev *c_rdev; | |
578 | ||
579 | c_node = of_parse_phandle(node, "regulator-coupled-with", index); | |
580 | if (!c_node) | |
581 | return NULL; | |
582 | ||
583 | c_rdev = of_find_regulator_by_node(c_node); | |
584 | ||
585 | of_node_put(c_node); | |
586 | ||
587 | return c_rdev; | |
588 | } |