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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 RN |
25 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
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 RN |
42 | |
43 | uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL); | |
44 | if (uV_offset) | |
45 | constraints->uV_offset = be32_to_cpu(*uV_offset); | |
46 | min_uA = of_get_property(np, "regulator-min-microamp", NULL); | |
47 | if (min_uA) | |
48 | constraints->min_uA = be32_to_cpu(*min_uA); | |
49 | max_uA = of_get_property(np, "regulator-max-microamp", NULL); | |
50 | if (max_uA) | |
51 | constraints->max_uA = be32_to_cpu(*max_uA); | |
52 | ||
53 | /* Current change possible? */ | |
54 | if (constraints->min_uA != constraints->max_uA) | |
55 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
56 | ||
57 | if (of_find_property(np, "regulator-boot-on", NULL)) | |
58 | constraints->boot_on = true; | |
59 | ||
60 | if (of_find_property(np, "regulator-always-on", NULL)) | |
61 | constraints->always_on = true; | |
62 | else /* status change should be possible if not always on. */ | |
63 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; | |
6f0b2c69 | 64 | |
93134c7b KVA |
65 | if (of_property_read_bool(np, "regulator-allow-bypass")) |
66 | constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; | |
67 | ||
1653ccf4 YSB |
68 | prop = of_find_property(np, "regulator-ramp-delay", NULL); |
69 | if (prop && prop->value) { | |
70 | ramp_delay = prop->value; | |
71 | if (*ramp_delay) | |
72 | constraints->ramp_delay = be32_to_cpu(*ramp_delay); | |
73 | else | |
74 | constraints->ramp_disable = true; | |
75 | } | |
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 TR |
102 | |
103 | /** | |
13511def | 104 | * of_regulator_match - extract multiple regulator init data from device tree. |
1c8fa58f TR |
105 | * @dev: device requesting the data |
106 | * @node: parent device node of the regulators | |
107 | * @matches: match table for the regulators | |
108 | * @num_matches: number of entries in match table | |
109 | * | |
13511def SW |
110 | * This function uses a match table specified by the regulator driver to |
111 | * parse regulator init data from the device tree. @node is expected to | |
112 | * contain a set of child nodes, each providing the init data for one | |
113 | * regulator. The data parsed from a child node will be matched to a regulator | |
114 | * based on either the deprecated property regulator-compatible if present, | |
115 | * or otherwise the child node's name. Note that the match table is modified | |
5260cd2b | 116 | * in place. |
1c8fa58f TR |
117 | * |
118 | * Returns the number of matches found or a negative error code on failure. | |
119 | */ | |
120 | int of_regulator_match(struct device *dev, struct device_node *node, | |
121 | struct of_regulator_match *matches, | |
122 | unsigned int num_matches) | |
123 | { | |
124 | unsigned int count = 0; | |
125 | unsigned int i; | |
13511def | 126 | const char *name; |
5260cd2b | 127 | struct device_node *child; |
1c8fa58f TR |
128 | |
129 | if (!dev || !node) | |
130 | return -EINVAL; | |
131 | ||
a2f95c36 SW |
132 | for (i = 0; i < num_matches; i++) { |
133 | struct of_regulator_match *match = &matches[i]; | |
134 | match->init_data = NULL; | |
135 | match->of_node = NULL; | |
136 | } | |
137 | ||
5260cd2b | 138 | for_each_child_of_node(node, child) { |
13511def | 139 | name = of_get_property(child, |
5260cd2b | 140 | "regulator-compatible", NULL); |
13511def SW |
141 | if (!name) |
142 | name = child->name; | |
5260cd2b LD |
143 | for (i = 0; i < num_matches; i++) { |
144 | struct of_regulator_match *match = &matches[i]; | |
145 | if (match->of_node) | |
146 | continue; | |
147 | ||
13511def | 148 | if (strcmp(match->name, name)) |
5260cd2b LD |
149 | continue; |
150 | ||
151 | match->init_data = | |
152 | of_get_regulator_init_data(dev, child); | |
153 | if (!match->init_data) { | |
154 | dev_err(dev, | |
155 | "failed to parse DT for regulator %s\n", | |
156 | child->name); | |
157 | return -EINVAL; | |
158 | } | |
159 | match->of_node = child; | |
160 | count++; | |
161 | break; | |
1c8fa58f | 162 | } |
1c8fa58f TR |
163 | } |
164 | ||
165 | return count; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(of_regulator_match); |