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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 | ||
8f446e6f RN |
22 | static void of_get_regulation_constraints(struct device_node *np, |
23 | struct regulator_init_data **init_data) | |
24 | { | |
1e050eab | 25 | const __be32 *min_uV, *max_uV; |
8f446e6f | 26 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
00c877c6 LD |
27 | int ret; |
28 | u32 pval; | |
8f446e6f RN |
29 | |
30 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
31 | ||
32 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); | |
33 | if (min_uV) | |
34 | constraints->min_uV = be32_to_cpu(*min_uV); | |
35 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); | |
36 | if (max_uV) | |
37 | constraints->max_uV = be32_to_cpu(*max_uV); | |
38 | ||
39 | /* Voltage change possible? */ | |
40 | if (constraints->min_uV != constraints->max_uV) | |
41 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; | |
ab62aa93 | 42 | /* Only one voltage? Then make sure it's set. */ |
8a093049 | 43 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
ab62aa93 | 44 | constraints->apply_uV = true; |
8f446e6f | 45 | |
1e050eab SS |
46 | if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval)) |
47 | constraints->uV_offset = pval; | |
48 | if (!of_property_read_u32(np, "regulator-min-microamp", &pval)) | |
49 | constraints->min_uA = pval; | |
50 | if (!of_property_read_u32(np, "regulator-max-microamp", &pval)) | |
51 | constraints->max_uA = pval; | |
8f446e6f RN |
52 | |
53 | /* Current change possible? */ | |
54 | if (constraints->min_uA != constraints->max_uA) | |
55 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
56 | ||
1e050eab SS |
57 | constraints->boot_on = of_property_read_bool(np, "regulator-boot-on"); |
58 | constraints->always_on = of_property_read_bool(np, "regulator-always-on"); | |
59 | if (!constraints->always_on) /* status change should be possible. */ | |
8f446e6f | 60 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
6f0b2c69 | 61 | |
93134c7b KVA |
62 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
63 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
64 | ||
1e050eab SS |
65 | ret = of_property_read_u32(np, "regulator-ramp-delay", &pval); |
66 | if (!ret) { | |
67 | if (pval) | |
68 | constraints->ramp_delay = pval; | |
1653ccf4 YSB |
69 | else |
70 | constraints->ramp_disable = true; | |
71 | } | |
00c877c6 LD |
72 | |
73 | ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); | |
74 | if (!ret) | |
75 | constraints->enable_time = pval; | |
8f446e6f RN |
76 | } |
77 | ||
78 | /** | |
79 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
80 | * @dev: device requesting for regulator_init_data | |
81 | * | |
82 | * Populates regulator_init_data structure by extracting data from device | |
83 | * tree node, returns a pointer to the populated struture or NULL if memory | |
84 | * alloc fails. | |
85 | */ | |
d9a861cc SG |
86 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
87 | struct device_node *node) | |
8f446e6f RN |
88 | { |
89 | struct regulator_init_data *init_data; | |
90 | ||
d9a861cc | 91 | if (!node) |
8f446e6f RN |
92 | return NULL; |
93 | ||
94 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
95 | if (!init_data) | |
96 | return NULL; /* Out of memory? */ | |
97 | ||
d9a861cc | 98 | of_get_regulation_constraints(node, &init_data); |
8f446e6f RN |
99 | return init_data; |
100 | } | |
e69af5e9 | 101 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f | 102 | |
13b3fde8 CK |
103 | struct devm_of_regulator_matches { |
104 | struct of_regulator_match *matches; | |
105 | unsigned int num_matches; | |
106 | }; | |
107 | ||
108 | static void devm_of_regulator_put_matches(struct device *dev, void *res) | |
109 | { | |
110 | struct devm_of_regulator_matches *devm_matches = res; | |
111 | int i; | |
112 | ||
113 | for (i = 0; i < devm_matches->num_matches; i++) | |
114 | of_node_put(devm_matches->matches[i].of_node); | |
115 | } | |
116 | ||
1c8fa58f | 117 | /** |
13511def | 118 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
119 | * @dev: device requesting the data |
120 | * @node: parent device node of the regulators | |
121 | * @matches: match table for the regulators | |
122 | * @num_matches: number of entries in match table | |
123 | * | |
13511def SW |
124 | * This function uses a match table specified by the regulator driver to |
125 | * parse regulator init data from the device tree. @node is expected to | |
126 | * contain a set of child nodes, each providing the init data for one | |
127 | * regulator. The data parsed from a child node will be matched to a regulator | |
128 | * based on either the deprecated property regulator-compatible if present, | |
129 | * or otherwise the child node's name. Note that the match table is modified | |
bd0dda74 CK |
130 | * in place and an additional of_node reference is taken for each matched |
131 | * regulator. | |
1c8fa58f TR |
132 | * |
133 | * Returns the number of matches found or a negative error code on failure. | |
134 | */ | |
135 | int of_regulator_match(struct device *dev, struct device_node *node, | |
136 | struct of_regulator_match *matches, | |
137 | unsigned int num_matches) | |
138 | { | |
139 | unsigned int count = 0; | |
140 | unsigned int i; | |
13511def | 141 | const char *name; |
5260cd2b | 142 | struct device_node *child; |
13b3fde8 | 143 | struct devm_of_regulator_matches *devm_matches; |
1c8fa58f TR |
144 | |
145 | if (!dev || !node) | |
146 | return -EINVAL; | |
147 | ||
13b3fde8 CK |
148 | devm_matches = devres_alloc(devm_of_regulator_put_matches, |
149 | sizeof(struct devm_of_regulator_matches), | |
150 | GFP_KERNEL); | |
151 | if (!devm_matches) | |
152 | return -ENOMEM; | |
153 | ||
154 | devm_matches->matches = matches; | |
155 | devm_matches->num_matches = num_matches; | |
156 | ||
157 | devres_add(dev, devm_matches); | |
158 | ||
a2f95c36 SW |
159 | for (i = 0; i < num_matches; i++) { |
160 | struct of_regulator_match *match = &matches[i]; | |
161 | match->init_data = NULL; | |
162 | match->of_node = NULL; | |
163 | } | |
164 | ||
5260cd2b | 165 | for_each_child_of_node(node, child) { |
13511def | 166 | name = of_get_property(child, |
5260cd2b | 167 | "regulator-compatible", NULL); |
13511def SW |
168 | if (!name) |
169 | name = child->name; | |
5260cd2b LD |
170 | for (i = 0; i < num_matches; i++) { |
171 | struct of_regulator_match *match = &matches[i]; | |
172 | if (match->of_node) | |
173 | continue; | |
174 | ||
13511def | 175 | if (strcmp(match->name, name)) |
5260cd2b LD |
176 | continue; |
177 | ||
178 | match->init_data = | |
179 | of_get_regulator_init_data(dev, child); | |
180 | if (!match->init_data) { | |
181 | dev_err(dev, | |
182 | "failed to parse DT for regulator %s\n", | |
183 | child->name); | |
184 | return -EINVAL; | |
185 | } | |
bd0dda74 | 186 | match->of_node = of_node_get(child); |
5260cd2b LD |
187 | count++; |
188 | break; | |
1c8fa58f | 189 | } |
1c8fa58f TR |
190 | } |
191 | ||
192 | return count; | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(of_regulator_match); | |
a0c7b164 MB |
195 | |
196 | struct regulator_init_data *regulator_of_get_init_data(struct device *dev, | |
197 | const struct regulator_desc *desc, | |
198 | struct device_node **node) | |
199 | { | |
200 | struct device_node *search, *child; | |
201 | struct regulator_init_data *init_data = NULL; | |
202 | const char *name; | |
203 | ||
204 | if (!dev->of_node || !desc->of_match) | |
205 | return NULL; | |
206 | ||
207 | if (desc->regulators_node) | |
208 | search = of_get_child_by_name(dev->of_node, | |
209 | desc->regulators_node); | |
210 | else | |
211 | search = dev->of_node; | |
212 | ||
213 | if (!search) { | |
214 | dev_err(dev, "Failed to find regulator container node\n"); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | for_each_child_of_node(search, child) { | |
219 | name = of_get_property(child, "regulator-compatible", NULL); | |
220 | if (!name) | |
221 | name = child->name; | |
222 | ||
223 | if (strcmp(desc->of_match, name)) | |
224 | continue; | |
225 | ||
226 | init_data = of_get_regulator_init_data(dev, child); | |
227 | if (!init_data) { | |
228 | dev_err(dev, | |
229 | "failed to parse DT for regulator %s\n", | |
230 | child->name); | |
231 | break; | |
232 | } | |
233 | ||
234 | of_node_get(child); | |
235 | *node = child; | |
236 | break; | |
237 | } | |
238 | ||
239 | of_node_put(search); | |
240 | ||
241 | return init_data; | |
242 | } |