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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> | |
1c8fa58f | 17 | #include <linux/regulator/of_regulator.h> |
8f446e6f RN |
18 | |
19 | static void of_get_regulation_constraints(struct device_node *np, | |
20 | struct regulator_init_data **init_data) | |
21 | { | |
1e050eab | 22 | const __be32 *min_uV, *max_uV; |
8f446e6f | 23 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
00c877c6 LD |
24 | int ret; |
25 | u32 pval; | |
8f446e6f RN |
26 | |
27 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
28 | ||
29 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); | |
30 | if (min_uV) | |
31 | constraints->min_uV = be32_to_cpu(*min_uV); | |
32 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); | |
33 | if (max_uV) | |
34 | constraints->max_uV = be32_to_cpu(*max_uV); | |
35 | ||
36 | /* Voltage change possible? */ | |
37 | if (constraints->min_uV != constraints->max_uV) | |
38 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; | |
ab62aa93 | 39 | /* Only one voltage? Then make sure it's set. */ |
8a093049 | 40 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
ab62aa93 | 41 | constraints->apply_uV = true; |
8f446e6f | 42 | |
1e050eab SS |
43 | if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval)) |
44 | constraints->uV_offset = pval; | |
45 | if (!of_property_read_u32(np, "regulator-min-microamp", &pval)) | |
46 | constraints->min_uA = pval; | |
47 | if (!of_property_read_u32(np, "regulator-max-microamp", &pval)) | |
48 | constraints->max_uA = pval; | |
8f446e6f RN |
49 | |
50 | /* Current change possible? */ | |
51 | if (constraints->min_uA != constraints->max_uA) | |
52 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
53 | ||
1e050eab SS |
54 | constraints->boot_on = of_property_read_bool(np, "regulator-boot-on"); |
55 | constraints->always_on = of_property_read_bool(np, "regulator-always-on"); | |
56 | if (!constraints->always_on) /* status change should be possible. */ | |
8f446e6f | 57 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
6f0b2c69 | 58 | |
93134c7b KVA |
59 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
60 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
61 | ||
1e050eab SS |
62 | ret = of_property_read_u32(np, "regulator-ramp-delay", &pval); |
63 | if (!ret) { | |
64 | if (pval) | |
65 | constraints->ramp_delay = pval; | |
1653ccf4 YSB |
66 | else |
67 | constraints->ramp_disable = true; | |
68 | } | |
00c877c6 LD |
69 | |
70 | ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); | |
71 | if (!ret) | |
72 | constraints->enable_time = pval; | |
8f446e6f RN |
73 | } |
74 | ||
75 | /** | |
76 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
77 | * @dev: device requesting for regulator_init_data | |
78 | * | |
79 | * Populates regulator_init_data structure by extracting data from device | |
80 | * tree node, returns a pointer to the populated struture or NULL if memory | |
81 | * alloc fails. | |
82 | */ | |
d9a861cc SG |
83 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
84 | struct device_node *node) | |
8f446e6f RN |
85 | { |
86 | struct regulator_init_data *init_data; | |
87 | ||
d9a861cc | 88 | if (!node) |
8f446e6f RN |
89 | return NULL; |
90 | ||
91 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
92 | if (!init_data) | |
93 | return NULL; /* Out of memory? */ | |
94 | ||
d9a861cc | 95 | of_get_regulation_constraints(node, &init_data); |
8f446e6f RN |
96 | return init_data; |
97 | } | |
e69af5e9 | 98 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f | 99 | |
13b3fde8 CK |
100 | struct devm_of_regulator_matches { |
101 | struct of_regulator_match *matches; | |
102 | unsigned int num_matches; | |
103 | }; | |
104 | ||
105 | static void devm_of_regulator_put_matches(struct device *dev, void *res) | |
106 | { | |
107 | struct devm_of_regulator_matches *devm_matches = res; | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < devm_matches->num_matches; i++) | |
111 | of_node_put(devm_matches->matches[i].of_node); | |
112 | } | |
113 | ||
1c8fa58f | 114 | /** |
13511def | 115 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
116 | * @dev: device requesting the data |
117 | * @node: parent device node of the regulators | |
118 | * @matches: match table for the regulators | |
119 | * @num_matches: number of entries in match table | |
120 | * | |
13511def SW |
121 | * This function uses a match table specified by the regulator driver to |
122 | * parse regulator init data from the device tree. @node is expected to | |
123 | * contain a set of child nodes, each providing the init data for one | |
124 | * regulator. The data parsed from a child node will be matched to a regulator | |
125 | * based on either the deprecated property regulator-compatible if present, | |
126 | * or otherwise the child node's name. Note that the match table is modified | |
bd0dda74 CK |
127 | * in place and an additional of_node reference is taken for each matched |
128 | * regulator. | |
1c8fa58f TR |
129 | * |
130 | * Returns the number of matches found or a negative error code on failure. | |
131 | */ | |
132 | int of_regulator_match(struct device *dev, struct device_node *node, | |
133 | struct of_regulator_match *matches, | |
134 | unsigned int num_matches) | |
135 | { | |
136 | unsigned int count = 0; | |
137 | unsigned int i; | |
13511def | 138 | const char *name; |
5260cd2b | 139 | struct device_node *child; |
13b3fde8 | 140 | struct devm_of_regulator_matches *devm_matches; |
1c8fa58f TR |
141 | |
142 | if (!dev || !node) | |
143 | return -EINVAL; | |
144 | ||
13b3fde8 CK |
145 | devm_matches = devres_alloc(devm_of_regulator_put_matches, |
146 | sizeof(struct devm_of_regulator_matches), | |
147 | GFP_KERNEL); | |
148 | if (!devm_matches) | |
149 | return -ENOMEM; | |
150 | ||
151 | devm_matches->matches = matches; | |
152 | devm_matches->num_matches = num_matches; | |
153 | ||
154 | devres_add(dev, devm_matches); | |
155 | ||
a2f95c36 SW |
156 | for (i = 0; i < num_matches; i++) { |
157 | struct of_regulator_match *match = &matches[i]; | |
158 | match->init_data = NULL; | |
159 | match->of_node = NULL; | |
160 | } | |
161 | ||
5260cd2b | 162 | for_each_child_of_node(node, child) { |
13511def | 163 | name = of_get_property(child, |
5260cd2b | 164 | "regulator-compatible", NULL); |
13511def SW |
165 | if (!name) |
166 | name = child->name; | |
5260cd2b LD |
167 | for (i = 0; i < num_matches; i++) { |
168 | struct of_regulator_match *match = &matches[i]; | |
169 | if (match->of_node) | |
170 | continue; | |
171 | ||
13511def | 172 | if (strcmp(match->name, name)) |
5260cd2b LD |
173 | continue; |
174 | ||
175 | match->init_data = | |
176 | of_get_regulator_init_data(dev, child); | |
177 | if (!match->init_data) { | |
178 | dev_err(dev, | |
179 | "failed to parse DT for regulator %s\n", | |
180 | child->name); | |
181 | return -EINVAL; | |
182 | } | |
bd0dda74 | 183 | match->of_node = of_node_get(child); |
5260cd2b LD |
184 | count++; |
185 | break; | |
1c8fa58f | 186 | } |
1c8fa58f TR |
187 | } |
188 | ||
189 | return count; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(of_regulator_match); |