blob: 7827384680d64a7f62b5e248d687953e5ca8ae7b [file] [log] [blame]
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{
22 const __be32 *min_uV, *max_uV, *uV_offset;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +053023 const __be32 *min_uA, *max_uA, *ramp_delay;
Yadwinder Singh Brar1653ccf2013-06-29 18:21:15 +053024 struct property *prop;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053025 struct regulation_constraints *constraints = &(*init_data)->constraints;
26
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
43 uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
44 if (uV_offset)
45 constraints->uV_offset = be32_to_cpu(*uV_offset);
46 min_uA = of_get_property(np, "regulator-min-microamp", NULL);
47 if (min_uA)
48 constraints->min_uA = be32_to_cpu(*min_uA);
49 max_uA = of_get_property(np, "regulator-max-microamp", NULL);
50 if (max_uA)
51 constraints->max_uA = be32_to_cpu(*max_uA);
52
53 /* Current change possible? */
54 if (constraints->min_uA != constraints->max_uA)
55 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
56
57 if (of_find_property(np, "regulator-boot-on", NULL))
58 constraints->boot_on = true;
59
60 if (of_find_property(np, "regulator-always-on", NULL))
61 constraints->always_on = true;
62 else /* status change should be possible if not always on. */
63 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +053064
Kishon Vijay Abraham I93134c72013-06-20 14:07:37 +053065 if (of_property_read_bool(np, "regulator-allow-bypass"))
66 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
67
Yadwinder Singh Brar1653ccf2013-06-29 18:21:15 +053068 prop = of_find_property(np, "regulator-ramp-delay", NULL);
69 if (prop && prop->value) {
70 ramp_delay = prop->value;
71 if (*ramp_delay)
72 constraints->ramp_delay = be32_to_cpu(*ramp_delay);
73 else
74 constraints->ramp_disable = true;
75 }
Rajendra Nayak8f446e62011-11-18 16:47:17 +053076}
77
78/**
79 * of_get_regulator_init_data - extract regulator_init_data structure info
80 * @dev: device requesting for regulator_init_data
81 *
82 * Populates regulator_init_data structure by extracting data from device
83 * tree node, returns a pointer to the populated struture or NULL if memory
84 * alloc fails.
85 */
Shawn Guod9a861c2011-12-01 17:21:06 +080086struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
87 struct device_node *node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053088{
89 struct regulator_init_data *init_data;
90
Shawn Guod9a861c2011-12-01 17:21:06 +080091 if (!node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053092 return NULL;
93
94 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
95 if (!init_data)
96 return NULL; /* Out of memory? */
97
Shawn Guod9a861c2011-12-01 17:21:06 +080098 of_get_regulation_constraints(node, &init_data);
Rajendra Nayak8f446e62011-11-18 16:47:17 +053099 return init_data;
100}
Axel Line69af5e2011-11-26 18:50:58 +0800101EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
Thierry Reding1c8fa582012-04-26 16:52:20 +0200102
103/**
Stephen Warren13511de2012-09-24 13:25:00 -0600104 * of_regulator_match - extract multiple regulator init data from device tree.
Thierry Reding1c8fa582012-04-26 16:52:20 +0200105 * @dev: device requesting the data
106 * @node: parent device node of the regulators
107 * @matches: match table for the regulators
108 * @num_matches: number of entries in match table
109 *
Stephen Warren13511de2012-09-24 13:25:00 -0600110 * This function uses a match table specified by the regulator driver to
111 * parse regulator init data from the device tree. @node is expected to
112 * contain a set of child nodes, each providing the init data for one
113 * regulator. The data parsed from a child node will be matched to a regulator
114 * based on either the deprecated property regulator-compatible if present,
115 * or otherwise the child node's name. Note that the match table is modified
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530116 * in place.
Thierry Reding1c8fa582012-04-26 16:52:20 +0200117 *
118 * Returns the number of matches found or a negative error code on failure.
119 */
120int of_regulator_match(struct device *dev, struct device_node *node,
121 struct of_regulator_match *matches,
122 unsigned int num_matches)
123{
124 unsigned int count = 0;
125 unsigned int i;
Stephen Warren13511de2012-09-24 13:25:00 -0600126 const char *name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530127 struct device_node *child;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200128
129 if (!dev || !node)
130 return -EINVAL;
131
Stephen Warrena2f95c32013-01-29 12:01:13 -0700132 for (i = 0; i < num_matches; i++) {
133 struct of_regulator_match *match = &matches[i];
134 match->init_data = NULL;
135 match->of_node = NULL;
136 }
137
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530138 for_each_child_of_node(node, child) {
Stephen Warren13511de2012-09-24 13:25:00 -0600139 name = of_get_property(child,
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530140 "regulator-compatible", NULL);
Stephen Warren13511de2012-09-24 13:25:00 -0600141 if (!name)
142 name = child->name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530143 for (i = 0; i < num_matches; i++) {
144 struct of_regulator_match *match = &matches[i];
145 if (match->of_node)
146 continue;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200147
Stephen Warren13511de2012-09-24 13:25:00 -0600148 if (strcmp(match->name, name))
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530149 continue;
150
151 match->init_data =
152 of_get_regulator_init_data(dev, child);
153 if (!match->init_data) {
154 dev_err(dev,
155 "failed to parse DT for regulator %s\n",
156 child->name);
157 return -EINVAL;
158 }
159 match->of_node = child;
160 count++;
161 break;
162 }
Thierry Reding1c8fa582012-04-26 16:52:20 +0200163 }
164
165 return count;
166}
167EXPORT_SYMBOL_GPL(of_regulator_match);