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Commit | Line | Data |
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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 | { |
1e050eab | 31 | const __be32 *min_uV, *max_uV; |
8f446e6f | 32 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
40e20d68 CC |
33 | struct regulator_state *suspend_state; |
34 | struct device_node *suspend_np; | |
35 | int ret, i; | |
00c877c6 | 36 | u32 pval; |
8f446e6f RN |
37 | |
38 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
39 | ||
40 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); | |
41 | if (min_uV) | |
42 | constraints->min_uV = be32_to_cpu(*min_uV); | |
43 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); | |
44 | if (max_uV) | |
45 | constraints->max_uV = be32_to_cpu(*max_uV); | |
46 | ||
47 | /* Voltage change possible? */ | |
48 | if (constraints->min_uV != constraints->max_uV) | |
49 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; | |
ab62aa93 | 50 | /* Only one voltage? Then make sure it's set. */ |
8a093049 | 51 | if (min_uV && max_uV && 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 RN |
60 | |
61 | /* Current change possible? */ | |
62 | if (constraints->min_uA != constraints->max_uA) | |
63 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
64 | ||
1e050eab SS |
65 | constraints->boot_on = of_property_read_bool(np, "regulator-boot-on"); |
66 | constraints->always_on = of_property_read_bool(np, "regulator-always-on"); | |
67 | if (!constraints->always_on) /* status change should be possible. */ | |
8f446e6f | 68 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
6f0b2c69 | 69 | |
93134c7b KVA |
70 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
71 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
72 | ||
1e050eab SS |
73 | ret = of_property_read_u32(np, "regulator-ramp-delay", &pval); |
74 | if (!ret) { | |
75 | if (pval) | |
76 | constraints->ramp_delay = pval; | |
1653ccf4 YSB |
77 | else |
78 | constraints->ramp_disable = true; | |
79 | } | |
00c877c6 LD |
80 | |
81 | ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); | |
82 | if (!ret) | |
83 | constraints->enable_time = pval; | |
40e20d68 | 84 | |
5e5e3a42 JMC |
85 | if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) { |
86 | if (desc && desc->of_map_mode) { | |
87 | ret = desc->of_map_mode(pval); | |
88 | if (ret == -EINVAL) | |
89 | pr_err("%s: invalid mode %u\n", np->name, pval); | |
90 | else | |
91 | constraints->initial_mode = ret; | |
92 | } else { | |
93 | pr_warn("%s: mapping for mode %d not defined\n", | |
94 | np->name, pval); | |
95 | } | |
96 | } | |
97 | ||
40e20d68 CC |
98 | for (i = 0; i < ARRAY_SIZE(regulator_states); i++) { |
99 | switch (i) { | |
100 | case PM_SUSPEND_MEM: | |
101 | suspend_state = &constraints->state_mem; | |
102 | break; | |
103 | case PM_SUSPEND_MAX: | |
104 | suspend_state = &constraints->state_disk; | |
105 | break; | |
106 | case PM_SUSPEND_ON: | |
107 | case PM_SUSPEND_FREEZE: | |
108 | case PM_SUSPEND_STANDBY: | |
109 | default: | |
110 | continue; | |
111 | }; | |
112 | ||
113 | suspend_np = of_get_child_by_name(np, regulator_states[i]); | |
114 | if (!suspend_np || !suspend_state) | |
115 | continue; | |
116 | ||
5e5e3a42 JMC |
117 | if (!of_property_read_u32(suspend_np, "regulator-mode", |
118 | &pval)) { | |
119 | if (desc && desc->of_map_mode) { | |
120 | ret = desc->of_map_mode(pval); | |
121 | if (ret == -EINVAL) | |
122 | pr_err("%s: invalid mode %u\n", | |
123 | np->name, pval); | |
124 | else | |
125 | suspend_state->mode = ret; | |
126 | } else { | |
127 | pr_warn("%s: mapping for mode %d not defined\n", | |
128 | np->name, pval); | |
129 | } | |
130 | } | |
131 | ||
40e20d68 CC |
132 | if (of_property_read_bool(suspend_np, |
133 | "regulator-on-in-suspend")) | |
134 | suspend_state->enabled = true; | |
135 | else if (of_property_read_bool(suspend_np, | |
136 | "regulator-off-in-suspend")) | |
137 | suspend_state->disabled = true; | |
138 | ||
8cbcaea8 DA |
139 | if (!of_property_read_u32(suspend_np, |
140 | "regulator-suspend-microvolt", &pval)) | |
141 | suspend_state->uV = pval; | |
142 | ||
4eafec83 | 143 | of_node_put(suspend_np); |
40e20d68 CC |
144 | suspend_state = NULL; |
145 | suspend_np = NULL; | |
146 | } | |
8f446e6f RN |
147 | } |
148 | ||
149 | /** | |
150 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
151 | * @dev: device requesting for regulator_init_data | |
072e78b1 JMC |
152 | * @node: regulator device node |
153 | * @desc: regulator description | |
8f446e6f RN |
154 | * |
155 | * Populates regulator_init_data structure by extracting data from device | |
156 | * tree node, returns a pointer to the populated struture or NULL if memory | |
157 | * alloc fails. | |
158 | */ | |
d9a861cc | 159 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
072e78b1 JMC |
160 | struct device_node *node, |
161 | const struct regulator_desc *desc) | |
8f446e6f RN |
162 | { |
163 | struct regulator_init_data *init_data; | |
164 | ||
d9a861cc | 165 | if (!node) |
8f446e6f RN |
166 | return NULL; |
167 | ||
168 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
169 | if (!init_data) | |
170 | return NULL; /* Out of memory? */ | |
171 | ||
5e5e3a42 | 172 | of_get_regulation_constraints(node, &init_data, desc); |
8f446e6f RN |
173 | return init_data; |
174 | } | |
e69af5e9 | 175 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f | 176 | |
13b3fde8 CK |
177 | struct devm_of_regulator_matches { |
178 | struct of_regulator_match *matches; | |
179 | unsigned int num_matches; | |
180 | }; | |
181 | ||
182 | static void devm_of_regulator_put_matches(struct device *dev, void *res) | |
183 | { | |
184 | struct devm_of_regulator_matches *devm_matches = res; | |
185 | int i; | |
186 | ||
187 | for (i = 0; i < devm_matches->num_matches; i++) | |
188 | of_node_put(devm_matches->matches[i].of_node); | |
189 | } | |
190 | ||
1c8fa58f | 191 | /** |
13511def | 192 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
193 | * @dev: device requesting the data |
194 | * @node: parent device node of the regulators | |
195 | * @matches: match table for the regulators | |
196 | * @num_matches: number of entries in match table | |
197 | * | |
13511def SW |
198 | * This function uses a match table specified by the regulator driver to |
199 | * parse regulator init data from the device tree. @node is expected to | |
200 | * contain a set of child nodes, each providing the init data for one | |
201 | * regulator. The data parsed from a child node will be matched to a regulator | |
202 | * based on either the deprecated property regulator-compatible if present, | |
203 | * or otherwise the child node's name. Note that the match table is modified | |
bd0dda74 CK |
204 | * in place and an additional of_node reference is taken for each matched |
205 | * regulator. | |
1c8fa58f TR |
206 | * |
207 | * Returns the number of matches found or a negative error code on failure. | |
208 | */ | |
209 | int of_regulator_match(struct device *dev, struct device_node *node, | |
210 | struct of_regulator_match *matches, | |
211 | unsigned int num_matches) | |
212 | { | |
213 | unsigned int count = 0; | |
214 | unsigned int i; | |
13511def | 215 | const char *name; |
5260cd2b | 216 | struct device_node *child; |
13b3fde8 | 217 | struct devm_of_regulator_matches *devm_matches; |
1c8fa58f TR |
218 | |
219 | if (!dev || !node) | |
220 | return -EINVAL; | |
221 | ||
13b3fde8 CK |
222 | devm_matches = devres_alloc(devm_of_regulator_put_matches, |
223 | sizeof(struct devm_of_regulator_matches), | |
224 | GFP_KERNEL); | |
225 | if (!devm_matches) | |
226 | return -ENOMEM; | |
227 | ||
228 | devm_matches->matches = matches; | |
229 | devm_matches->num_matches = num_matches; | |
230 | ||
231 | devres_add(dev, devm_matches); | |
232 | ||
a2f95c36 SW |
233 | for (i = 0; i < num_matches; i++) { |
234 | struct of_regulator_match *match = &matches[i]; | |
235 | match->init_data = NULL; | |
236 | match->of_node = NULL; | |
237 | } | |
238 | ||
5260cd2b | 239 | for_each_child_of_node(node, child) { |
13511def | 240 | name = of_get_property(child, |
5260cd2b | 241 | "regulator-compatible", NULL); |
13511def SW |
242 | if (!name) |
243 | name = child->name; | |
5260cd2b LD |
244 | for (i = 0; i < num_matches; i++) { |
245 | struct of_regulator_match *match = &matches[i]; | |
246 | if (match->of_node) | |
247 | continue; | |
248 | ||
13511def | 249 | if (strcmp(match->name, name)) |
5260cd2b LD |
250 | continue; |
251 | ||
252 | match->init_data = | |
75d6b2fa JMC |
253 | of_get_regulator_init_data(dev, child, |
254 | match->desc); | |
5260cd2b LD |
255 | if (!match->init_data) { |
256 | dev_err(dev, | |
257 | "failed to parse DT for regulator %s\n", | |
258 | child->name); | |
259 | return -EINVAL; | |
260 | } | |
bd0dda74 | 261 | match->of_node = of_node_get(child); |
5260cd2b LD |
262 | count++; |
263 | break; | |
1c8fa58f | 264 | } |
1c8fa58f TR |
265 | } |
266 | ||
267 | return count; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(of_regulator_match); | |
a0c7b164 MB |
270 | |
271 | struct regulator_init_data *regulator_of_get_init_data(struct device *dev, | |
272 | const struct regulator_desc *desc, | |
273 | struct device_node **node) | |
274 | { | |
275 | struct device_node *search, *child; | |
276 | struct regulator_init_data *init_data = NULL; | |
277 | const char *name; | |
278 | ||
279 | if (!dev->of_node || !desc->of_match) | |
280 | return NULL; | |
281 | ||
282 | if (desc->regulators_node) | |
283 | search = of_get_child_by_name(dev->of_node, | |
284 | desc->regulators_node); | |
285 | else | |
286 | search = dev->of_node; | |
287 | ||
288 | if (!search) { | |
7de79a1d MB |
289 | dev_dbg(dev, "Failed to find regulator container node '%s'\n", |
290 | desc->regulators_node); | |
a0c7b164 MB |
291 | return NULL; |
292 | } | |
293 | ||
294 | for_each_child_of_node(search, child) { | |
295 | name = of_get_property(child, "regulator-compatible", NULL); | |
296 | if (!name) | |
297 | name = child->name; | |
298 | ||
299 | if (strcmp(desc->of_match, name)) | |
300 | continue; | |
301 | ||
072e78b1 | 302 | init_data = of_get_regulator_init_data(dev, child, desc); |
a0c7b164 MB |
303 | if (!init_data) { |
304 | dev_err(dev, | |
305 | "failed to parse DT for regulator %s\n", | |
306 | child->name); | |
307 | break; | |
308 | } | |
309 | ||
310 | of_node_get(child); | |
311 | *node = child; | |
312 | break; | |
313 | } | |
314 | ||
315 | of_node_put(search); | |
316 | ||
317 | return init_data; | |
318 | } |