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Rajendra Nayak8f446e62011-11-18 16:47:17 +05301/*
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
Axel Line69af5e2011-11-26 18:50:58 +080013#include <linux/module.h>
Rajendra Nayak8f446e62011-11-18 16:47:17 +053014#include <linux/slab.h>
15#include <linux/of.h>
16#include <linux/regulator/machine.h>
Thierry Reding1c8fa582012-04-26 16:52:20 +020017#include <linux/regulator/of_regulator.h>
Rajendra Nayak8f446e62011-11-18 16:47:17 +053018
19static void of_get_regulation_constraints(struct device_node *np,
20 struct regulator_init_data **init_data)
21{
Sergei Shtylyov1e050ea2014-05-27 00:27:19 +040022 const __be32 *min_uV, *max_uV;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053023 struct regulation_constraints *constraints = &(*init_data)->constraints;
Laxman Dewangan00c877c2013-09-18 18:18:02 +053024 int ret;
25 u32 pval;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053026
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;
Mark Brownab62aa92011-12-05 10:58:41 +000039 /* Only one voltage? Then make sure it's set. */
Karol Lewandowski8a093042012-01-25 10:31:45 +010040 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
Mark Brownab62aa92011-12-05 10:58:41 +000041 constraints->apply_uV = true;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053042
Sergei Shtylyov1e050ea2014-05-27 00:27:19 +040043 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;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053049
50 /* Current change possible? */
51 if (constraints->min_uA != constraints->max_uA)
52 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
53
Sergei Shtylyov1e050ea2014-05-27 00:27:19 +040054 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. */
Rajendra Nayak8f446e62011-11-18 16:47:17 +053057 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +053058
Kishon Vijay Abraham I93134c72013-06-20 14:07:37 +053059 if (of_property_read_bool(np, "regulator-allow-bypass"))
60 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
61
Sergei Shtylyov1e050ea2014-05-27 00:27:19 +040062 ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
63 if (!ret) {
64 if (pval)
65 constraints->ramp_delay = pval;
Yadwinder Singh Brar1653ccf2013-06-29 18:21:15 +053066 else
67 constraints->ramp_disable = true;
68 }
Laxman Dewangan00c877c2013-09-18 18:18:02 +053069
70 ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
71 if (!ret)
72 constraints->enable_time = pval;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053073}
74
75/**
76 * of_get_regulator_init_data - extract regulator_init_data structure info
77 * @dev: device requesting for regulator_init_data
78 *
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
81 * alloc fails.
82 */
Shawn Guod9a861c2011-12-01 17:21:06 +080083struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
84 struct device_node *node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053085{
86 struct regulator_init_data *init_data;
87
Shawn Guod9a861c2011-12-01 17:21:06 +080088 if (!node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053089 return NULL;
90
91 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
92 if (!init_data)
93 return NULL; /* Out of memory? */
94
Shawn Guod9a861c2011-12-01 17:21:06 +080095 of_get_regulation_constraints(node, &init_data);
Rajendra Nayak8f446e62011-11-18 16:47:17 +053096 return init_data;
97}
Axel Line69af5e2011-11-26 18:50:58 +080098EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
Thierry Reding1c8fa582012-04-26 16:52:20 +020099
Charles Keepax13b3fde2014-04-15 13:34:36 +0100100struct devm_of_regulator_matches {
101 struct of_regulator_match *matches;
102 unsigned int num_matches;
103};
104
105static void devm_of_regulator_put_matches(struct device *dev, void *res)
106{
107 struct devm_of_regulator_matches *devm_matches = res;
108 int i;
109
110 for (i = 0; i < devm_matches->num_matches; i++)
111 of_node_put(devm_matches->matches[i].of_node);
112}
113
Thierry Reding1c8fa582012-04-26 16:52:20 +0200114/**
Stephen Warren13511de2012-09-24 13:25:00 -0600115 * of_regulator_match - extract multiple regulator init data from device tree.
Thierry Reding1c8fa582012-04-26 16:52:20 +0200116 * @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
120 *
Stephen Warren13511de2012-09-24 13:25:00 -0600121 * 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
Charles Keepaxbd0dda742014-04-03 15:32:15 +0100127 * in place and an additional of_node reference is taken for each matched
128 * regulator.
Thierry Reding1c8fa582012-04-26 16:52:20 +0200129 *
130 * Returns the number of matches found or a negative error code on failure.
131 */
132int of_regulator_match(struct device *dev, struct device_node *node,
133 struct of_regulator_match *matches,
134 unsigned int num_matches)
135{
136 unsigned int count = 0;
137 unsigned int i;
Stephen Warren13511de2012-09-24 13:25:00 -0600138 const char *name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530139 struct device_node *child;
Charles Keepax13b3fde2014-04-15 13:34:36 +0100140 struct devm_of_regulator_matches *devm_matches;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200141
142 if (!dev || !node)
143 return -EINVAL;
144
Charles Keepax13b3fde2014-04-15 13:34:36 +0100145 devm_matches = devres_alloc(devm_of_regulator_put_matches,
146 sizeof(struct devm_of_regulator_matches),
147 GFP_KERNEL);
148 if (!devm_matches)
149 return -ENOMEM;
150
151 devm_matches->matches = matches;
152 devm_matches->num_matches = num_matches;
153
154 devres_add(dev, devm_matches);
155
Stephen Warrena2f95c32013-01-29 12:01:13 -0700156 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;
160 }
161
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530162 for_each_child_of_node(node, child) {
Stephen Warren13511de2012-09-24 13:25:00 -0600163 name = of_get_property(child,
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530164 "regulator-compatible", NULL);
Stephen Warren13511de2012-09-24 13:25:00 -0600165 if (!name)
166 name = child->name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530167 for (i = 0; i < num_matches; i++) {
168 struct of_regulator_match *match = &matches[i];
169 if (match->of_node)
170 continue;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200171
Stephen Warren13511de2012-09-24 13:25:00 -0600172 if (strcmp(match->name, name))
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530173 continue;
174
175 match->init_data =
176 of_get_regulator_init_data(dev, child);
177 if (!match->init_data) {
178 dev_err(dev,
179 "failed to parse DT for regulator %s\n",
180 child->name);
181 return -EINVAL;
182 }
Charles Keepaxbd0dda742014-04-03 15:32:15 +0100183 match->of_node = of_node_get(child);
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530184 count++;
185 break;
186 }
Thierry Reding1c8fa582012-04-26 16:52:20 +0200187 }
188
189 return count;
190}
191EXPORT_SYMBOL_GPL(of_regulator_match);