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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 | { | |
22 | const __be32 *min_uV, *max_uV, *uV_offset; | |
6f0b2c69 | 23 | const __be32 *min_uA, *max_uA, *ramp_delay; |
1653ccf4 | 24 | struct property *prop; |
8f446e6f | 25 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
00c877c6 LD |
26 | int ret; |
27 | u32 pval; | |
8f446e6f RN |
28 | |
29 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
30 | ||
31 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); | |
32 | if (min_uV) | |
33 | constraints->min_uV = be32_to_cpu(*min_uV); | |
34 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); | |
35 | if (max_uV) | |
36 | constraints->max_uV = be32_to_cpu(*max_uV); | |
37 | ||
38 | /* Voltage change possible? */ | |
39 | if (constraints->min_uV != constraints->max_uV) | |
40 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; | |
ab62aa93 | 41 | /* Only one voltage? Then make sure it's set. */ |
8a093049 | 42 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
ab62aa93 | 43 | constraints->apply_uV = true; |
8f446e6f RN |
44 | |
45 | uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL); | |
46 | if (uV_offset) | |
47 | constraints->uV_offset = be32_to_cpu(*uV_offset); | |
48 | min_uA = of_get_property(np, "regulator-min-microamp", NULL); | |
49 | if (min_uA) | |
50 | constraints->min_uA = be32_to_cpu(*min_uA); | |
51 | max_uA = of_get_property(np, "regulator-max-microamp", NULL); | |
52 | if (max_uA) | |
53 | constraints->max_uA = be32_to_cpu(*max_uA); | |
54 | ||
55 | /* Current change possible? */ | |
56 | if (constraints->min_uA != constraints->max_uA) | |
57 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
58 | ||
59 | if (of_find_property(np, "regulator-boot-on", NULL)) | |
60 | constraints->boot_on = true; | |
61 | ||
62 | if (of_find_property(np, "regulator-always-on", NULL)) | |
63 | constraints->always_on = true; | |
64 | else /* status change should be possible if not always on. */ | |
65 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; | |
6f0b2c69 | 66 | |
93134c7b KVA |
67 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
68 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
69 | ||
1653ccf4 YSB |
70 | prop = of_find_property(np, "regulator-ramp-delay", NULL); |
71 | if (prop && prop->value) { | |
72 | ramp_delay = prop->value; | |
73 | if (*ramp_delay) | |
74 | constraints->ramp_delay = be32_to_cpu(*ramp_delay); | |
75 | else | |
76 | constraints->ramp_disable = true; | |
77 | } | |
00c877c6 LD |
78 | |
79 | ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); | |
80 | if (!ret) | |
81 | constraints->enable_time = pval; | |
8f446e6f RN |
82 | } |
83 | ||
84 | /** | |
85 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
86 | * @dev: device requesting for regulator_init_data | |
87 | * | |
88 | * Populates regulator_init_data structure by extracting data from device | |
89 | * tree node, returns a pointer to the populated struture or NULL if memory | |
90 | * alloc fails. | |
91 | */ | |
d9a861cc SG |
92 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
93 | struct device_node *node) | |
8f446e6f RN |
94 | { |
95 | struct regulator_init_data *init_data; | |
96 | ||
d9a861cc | 97 | if (!node) |
8f446e6f RN |
98 | return NULL; |
99 | ||
100 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
101 | if (!init_data) | |
102 | return NULL; /* Out of memory? */ | |
103 | ||
d9a861cc | 104 | of_get_regulation_constraints(node, &init_data); |
8f446e6f RN |
105 | return init_data; |
106 | } | |
e69af5e9 | 107 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f TR |
108 | |
109 | /** | |
13511def | 110 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
111 | * @dev: device requesting the data |
112 | * @node: parent device node of the regulators | |
113 | * @matches: match table for the regulators | |
114 | * @num_matches: number of entries in match table | |
115 | * | |
13511def SW |
116 | * This function uses a match table specified by the regulator driver to |
117 | * parse regulator init data from the device tree. @node is expected to | |
118 | * contain a set of child nodes, each providing the init data for one | |
119 | * regulator. The data parsed from a child node will be matched to a regulator | |
120 | * based on either the deprecated property regulator-compatible if present, | |
121 | * or otherwise the child node's name. Note that the match table is modified | |
5260cd2b | 122 | * in place. |
1c8fa58f TR |
123 | * |
124 | * Returns the number of matches found or a negative error code on failure. | |
125 | */ | |
126 | int of_regulator_match(struct device *dev, struct device_node *node, | |
127 | struct of_regulator_match *matches, | |
128 | unsigned int num_matches) | |
129 | { | |
130 | unsigned int count = 0; | |
131 | unsigned int i; | |
13511def | 132 | const char *name; |
5260cd2b | 133 | struct device_node *child; |
1c8fa58f TR |
134 | |
135 | if (!dev || !node) | |
136 | return -EINVAL; | |
137 | ||
a2f95c36 SW |
138 | for (i = 0; i < num_matches; i++) { |
139 | struct of_regulator_match *match = &matches[i]; | |
140 | match->init_data = NULL; | |
141 | match->of_node = NULL; | |
142 | } | |
143 | ||
5260cd2b | 144 | for_each_child_of_node(node, child) { |
13511def | 145 | name = of_get_property(child, |
5260cd2b | 146 | "regulator-compatible", NULL); |
13511def SW |
147 | if (!name) |
148 | name = child->name; | |
5260cd2b LD |
149 | for (i = 0; i < num_matches; i++) { |
150 | struct of_regulator_match *match = &matches[i]; | |
151 | if (match->of_node) | |
152 | continue; | |
153 | ||
13511def | 154 | if (strcmp(match->name, name)) |
5260cd2b LD |
155 | continue; |
156 | ||
157 | match->init_data = | |
158 | of_get_regulator_init_data(dev, child); | |
159 | if (!match->init_data) { | |
160 | dev_err(dev, | |
161 | "failed to parse DT for regulator %s\n", | |
162 | child->name); | |
163 | return -EINVAL; | |
164 | } | |
165 | match->of_node = child; | |
166 | count++; | |
167 | break; | |
1c8fa58f | 168 | } |
1c8fa58f TR |
169 | } |
170 | ||
171 | return count; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(of_regulator_match); |