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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; |
8f446e6f RN |
24 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
25 | ||
26 | constraints->name = of_get_property(np, "regulator-name", NULL); | |
27 | ||
28 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); | |
29 | if (min_uV) | |
30 | constraints->min_uV = be32_to_cpu(*min_uV); | |
31 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); | |
32 | if (max_uV) | |
33 | constraints->max_uV = be32_to_cpu(*max_uV); | |
34 | ||
35 | /* Voltage change possible? */ | |
36 | if (constraints->min_uV != constraints->max_uV) | |
37 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; | |
ab62aa93 | 38 | /* Only one voltage? Then make sure it's set. */ |
8a093049 | 39 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
ab62aa93 | 40 | constraints->apply_uV = true; |
8f446e6f RN |
41 | |
42 | uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL); | |
43 | if (uV_offset) | |
44 | constraints->uV_offset = be32_to_cpu(*uV_offset); | |
45 | min_uA = of_get_property(np, "regulator-min-microamp", NULL); | |
46 | if (min_uA) | |
47 | constraints->min_uA = be32_to_cpu(*min_uA); | |
48 | max_uA = of_get_property(np, "regulator-max-microamp", NULL); | |
49 | if (max_uA) | |
50 | constraints->max_uA = be32_to_cpu(*max_uA); | |
51 | ||
52 | /* Current change possible? */ | |
53 | if (constraints->min_uA != constraints->max_uA) | |
54 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; | |
55 | ||
56 | if (of_find_property(np, "regulator-boot-on", NULL)) | |
57 | constraints->boot_on = true; | |
58 | ||
59 | if (of_find_property(np, "regulator-always-on", NULL)) | |
60 | constraints->always_on = true; | |
61 | else /* status change should be possible if not always on. */ | |
62 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; | |
6f0b2c69 YSB |
63 | |
64 | ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL); | |
65 | if (ramp_delay) | |
086ccd43 | 66 | constraints->ramp_delay = be32_to_cpu(*ramp_delay); |
8f446e6f RN |
67 | } |
68 | ||
69 | /** | |
70 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
71 | * @dev: device requesting for regulator_init_data | |
72 | * | |
73 | * Populates regulator_init_data structure by extracting data from device | |
74 | * tree node, returns a pointer to the populated struture or NULL if memory | |
75 | * alloc fails. | |
76 | */ | |
d9a861cc SG |
77 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
78 | struct device_node *node) | |
8f446e6f RN |
79 | { |
80 | struct regulator_init_data *init_data; | |
81 | ||
d9a861cc | 82 | if (!node) |
8f446e6f RN |
83 | return NULL; |
84 | ||
85 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
86 | if (!init_data) | |
87 | return NULL; /* Out of memory? */ | |
88 | ||
d9a861cc | 89 | of_get_regulation_constraints(node, &init_data); |
8f446e6f RN |
90 | return init_data; |
91 | } | |
e69af5e9 | 92 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f TR |
93 | |
94 | /** | |
5260cd2b LD |
95 | * of_regulator_match - extract regulator init data when node |
96 | * property "regulator-compatible" matches with the regulator name. | |
1c8fa58f TR |
97 | * @dev: device requesting the data |
98 | * @node: parent device node of the regulators | |
99 | * @matches: match table for the regulators | |
100 | * @num_matches: number of entries in match table | |
101 | * | |
102 | * This function uses a match table specified by the regulator driver and | |
5260cd2b LD |
103 | * looks up the corresponding init data in the device tree if |
104 | * regulator-compatible matches. Note that the match table is modified | |
105 | * in place. | |
1c8fa58f TR |
106 | * |
107 | * Returns the number of matches found or a negative error code on failure. | |
108 | */ | |
109 | int of_regulator_match(struct device *dev, struct device_node *node, | |
110 | struct of_regulator_match *matches, | |
111 | unsigned int num_matches) | |
112 | { | |
113 | unsigned int count = 0; | |
114 | unsigned int i; | |
5260cd2b LD |
115 | const char *regulator_comp; |
116 | struct device_node *child; | |
1c8fa58f TR |
117 | |
118 | if (!dev || !node) | |
119 | return -EINVAL; | |
120 | ||
5260cd2b LD |
121 | for_each_child_of_node(node, child) { |
122 | regulator_comp = of_get_property(child, | |
123 | "regulator-compatible", NULL); | |
124 | if (!regulator_comp) { | |
125 | dev_err(dev, "regulator-compatible is missing for node %s\n", | |
1c8fa58f | 126 | child->name); |
5260cd2b LD |
127 | continue; |
128 | } | |
129 | for (i = 0; i < num_matches; i++) { | |
130 | struct of_regulator_match *match = &matches[i]; | |
131 | if (match->of_node) | |
132 | continue; | |
133 | ||
134 | if (strcmp(match->name, regulator_comp)) | |
135 | continue; | |
136 | ||
137 | match->init_data = | |
138 | of_get_regulator_init_data(dev, child); | |
139 | if (!match->init_data) { | |
140 | dev_err(dev, | |
141 | "failed to parse DT for regulator %s\n", | |
142 | child->name); | |
143 | return -EINVAL; | |
144 | } | |
145 | match->of_node = child; | |
146 | count++; | |
147 | break; | |
1c8fa58f | 148 | } |
1c8fa58f TR |
149 | } |
150 | ||
151 | return count; | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(of_regulator_match); |