2 * OF helpers for regulator framework
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Rajendra Nayak <rnayak@ti.com>
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.
13 #include <linux/module.h>
14 #include <linux/slab.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/regulator/of_regulator.h>
19 static void of_get_regulation_constraints(struct device_node *np,
20 struct regulator_init_data **init_data)
22 const __be32 *min_uV, *max_uV;
23 struct regulation_constraints *constraints = &(*init_data)->constraints;
27 constraints->name = of_get_property(np, "regulator-name", NULL);
29 min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
31 constraints->min_uV = be32_to_cpu(*min_uV);
32 max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
34 constraints->max_uV = be32_to_cpu(*max_uV);
36 /* Voltage change possible? */
37 if (constraints->min_uV != constraints->max_uV)
38 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
39 /* Only one voltage? Then make sure it's set. */
40 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
41 constraints->apply_uV = true;
43 if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
44 constraints->uV_offset = pval;
45 if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
46 constraints->min_uA = pval;
47 if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
48 constraints->max_uA = pval;
50 /* Current change possible? */
51 if (constraints->min_uA != constraints->max_uA)
52 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
54 constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
55 constraints->always_on = of_property_read_bool(np, "regulator-always-on");
56 if (!constraints->always_on) /* status change should be possible. */
57 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
59 if (of_property_read_bool(np, "regulator-allow-bypass"))
60 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
62 ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
65 constraints->ramp_delay = pval;
67 constraints->ramp_disable = true;
70 ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
72 constraints->enable_time = pval;
76 * of_get_regulator_init_data - extract regulator_init_data structure info
77 * @dev: device requesting for regulator_init_data
79 * Populates regulator_init_data structure by extracting data from device
80 * tree node, returns a pointer to the populated struture or NULL if memory
83 struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
84 struct device_node *node)
86 struct regulator_init_data *init_data;
91 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
93 return NULL; /* Out of memory? */
95 of_get_regulation_constraints(node, &init_data);
98 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
100 struct devm_of_regulator_matches {
101 struct of_regulator_match *matches;
102 unsigned int num_matches;
105 static void devm_of_regulator_put_matches(struct device *dev, void *res)
107 struct devm_of_regulator_matches *devm_matches = res;
110 for (i = 0; i < devm_matches->num_matches; i++)
111 of_node_put(devm_matches->matches[i].of_node);
115 * of_regulator_match - extract multiple regulator init data from device tree.
116 * @dev: device requesting the data
117 * @node: parent device node of the regulators
118 * @matches: match table for the regulators
119 * @num_matches: number of entries in match table
121 * This function uses a match table specified by the regulator driver to
122 * parse regulator init data from the device tree. @node is expected to
123 * contain a set of child nodes, each providing the init data for one
124 * regulator. The data parsed from a child node will be matched to a regulator
125 * based on either the deprecated property regulator-compatible if present,
126 * or otherwise the child node's name. Note that the match table is modified
127 * in place and an additional of_node reference is taken for each matched
130 * Returns the number of matches found or a negative error code on failure.
132 int of_regulator_match(struct device *dev, struct device_node *node,
133 struct of_regulator_match *matches,
134 unsigned int num_matches)
136 unsigned int count = 0;
139 struct device_node *child;
140 struct devm_of_regulator_matches *devm_matches;
145 devm_matches = devres_alloc(devm_of_regulator_put_matches,
146 sizeof(struct devm_of_regulator_matches),
151 devm_matches->matches = matches;
152 devm_matches->num_matches = num_matches;
154 devres_add(dev, devm_matches);
156 for (i = 0; i < num_matches; i++) {
157 struct of_regulator_match *match = &matches[i];
158 match->init_data = NULL;
159 match->of_node = NULL;
162 for_each_child_of_node(node, child) {
163 name = of_get_property(child,
164 "regulator-compatible", NULL);
167 for (i = 0; i < num_matches; i++) {
168 struct of_regulator_match *match = &matches[i];
172 if (strcmp(match->name, name))
176 of_get_regulator_init_data(dev, child);
177 if (!match->init_data) {
179 "failed to parse DT for regulator %s\n",
183 match->of_node = of_node_get(child);
191 EXPORT_SYMBOL_GPL(of_regulator_match);