Commit | Line | Data |
---|---|---|
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; | |
23 | const __be32 *min_uA, *max_uA; | |
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; | |
63 | } | |
64 | ||
65 | /** | |
66 | * of_get_regulator_init_data - extract regulator_init_data structure info | |
67 | * @dev: device requesting for regulator_init_data | |
68 | * | |
69 | * Populates regulator_init_data structure by extracting data from device | |
70 | * tree node, returns a pointer to the populated struture or NULL if memory | |
71 | * alloc fails. | |
72 | */ | |
d9a861cc SG |
73 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
74 | struct device_node *node) | |
8f446e6f RN |
75 | { |
76 | struct regulator_init_data *init_data; | |
77 | ||
d9a861cc | 78 | if (!node) |
8f446e6f RN |
79 | return NULL; |
80 | ||
81 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); | |
82 | if (!init_data) | |
83 | return NULL; /* Out of memory? */ | |
84 | ||
d9a861cc | 85 | of_get_regulation_constraints(node, &init_data); |
8f446e6f RN |
86 | return init_data; |
87 | } | |
e69af5e9 | 88 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
1c8fa58f TR |
89 | |
90 | /** | |
91 | * of_regulator_match - extract regulator init data | |
92 | * @dev: device requesting the data | |
93 | * @node: parent device node of the regulators | |
94 | * @matches: match table for the regulators | |
95 | * @num_matches: number of entries in match table | |
96 | * | |
97 | * This function uses a match table specified by the regulator driver and | |
98 | * looks up the corresponding init data in the device tree. Note that the | |
99 | * match table is modified in place. | |
100 | * | |
101 | * Returns the number of matches found or a negative error code on failure. | |
102 | */ | |
103 | int of_regulator_match(struct device *dev, struct device_node *node, | |
104 | struct of_regulator_match *matches, | |
105 | unsigned int num_matches) | |
106 | { | |
107 | unsigned int count = 0; | |
108 | unsigned int i; | |
109 | ||
110 | if (!dev || !node) | |
111 | return -EINVAL; | |
112 | ||
113 | for (i = 0; i < num_matches; i++) { | |
114 | struct of_regulator_match *match = &matches[i]; | |
115 | struct device_node *child; | |
116 | ||
117 | child = of_find_node_by_name(node, match->name); | |
118 | if (!child) | |
119 | continue; | |
120 | ||
121 | match->init_data = of_get_regulator_init_data(dev, child); | |
122 | if (!match->init_data) { | |
123 | dev_err(dev, "failed to parse DT for regulator %s\n", | |
124 | child->name); | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | match->of_node = child; | |
129 | count++; | |
130 | } | |
131 | ||
132 | return count; | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(of_regulator_match); |