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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 | |
13 | #include <linux/module.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/of.h> |
16 | #include <linux/regulator/machine.h> |
17 | #include <linux/regulator/of_regulator.h> |
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, *ramp_delay; |
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; |
38 | /* Only one voltage? Then make sure it's set. */ |
39 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
40 | constraints->apply_uV = true; |
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 | ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL); |
65 | if (ramp_delay) |
66 | constraints->ramp_delay = be32_to_cpu(*ramp_delay); |
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 | */ |
77 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
78 | struct device_node *node) |
79 | { |
80 | struct regulator_init_data *init_data; |
81 | |
82 | if (!node) |
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 | |
89 | of_get_regulation_constraints(node, &init_data); |
90 | return init_data; |
91 | } |
92 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
93 | |
94 | /** |
95 | * of_regulator_match - extract multiple regulator init data from device tree. |
96 | * @dev: device requesting the data |
97 | * @node: parent device node of the regulators |
98 | * @matches: match table for the regulators |
99 | * @num_matches: number of entries in match table |
100 | * |
101 | * This function uses a match table specified by the regulator driver to |
102 | * parse regulator init data from the device tree. @node is expected to |
103 | * contain a set of child nodes, each providing the init data for one |
104 | * regulator. The data parsed from a child node will be matched to a regulator |
105 | * based on either the deprecated property regulator-compatible if present, |
106 | * or otherwise the child node's name. Note that the match table is modified |
107 | * in place. |
108 | * |
109 | * Returns the number of matches found or a negative error code on failure. |
110 | */ |
111 | int of_regulator_match(struct device *dev, struct device_node *node, |
112 | struct of_regulator_match *matches, |
113 | unsigned int num_matches) |
114 | { |
115 | unsigned int count = 0; |
116 | unsigned int i; |
117 | const char *name; |
118 | struct device_node *child; |
119 | |
120 | if (!dev || !node) |
121 | return -EINVAL; |
122 | |
123 | for (i = 0; i < num_matches; i++) { |
124 | struct of_regulator_match *match = &matches[i]; |
125 | match->init_data = NULL; |
126 | match->of_node = NULL; |
127 | } |
128 | |
129 | for_each_child_of_node(node, child) { |
130 | name = of_get_property(child, |
131 | "regulator-compatible", NULL); |
132 | if (!name) |
133 | name = child->name; |
134 | for (i = 0; i < num_matches; i++) { |
135 | struct of_regulator_match *match = &matches[i]; |
136 | if (match->of_node) |
137 | continue; |
138 | |
139 | if (strcmp(match->name, name)) |
140 | continue; |
141 | |
142 | match->init_data = |
143 | of_get_regulator_init_data(dev, child); |
144 | if (!match->init_data) { |
145 | dev_err(dev, |
146 | "failed to parse DT for regulator %s\n", |
147 | child->name); |
148 | return -EINVAL; |
149 | } |
150 | match->of_node = child; |
151 | count++; |
152 | break; |
153 | } |
154 | } |
155 | |
156 | return count; |
157 | } |
158 | EXPORT_SYMBOL_GPL(of_regulator_match); |
159 |
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