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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{
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;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053024 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;
Mark Brownab62aa92011-12-05 10:58:41 +000038 /* Only one voltage? Then make sure it's set. */
Karol Lewandowski8a093042012-01-25 10:31:45 +010039 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
Mark Brownab62aa92011-12-05 10:58:41 +000040 constraints->apply_uV = true;
Rajendra Nayak8f446e62011-11-18 16:47:17 +053041
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;
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +053063
Kishon Vijay Abraham I93134c72013-06-20 14:07:37 +053064 if (of_property_read_bool(np, "regulator-allow-bypass"))
65 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
66
Yadwinder Singh Brar6f0b2c62012-06-11 17:41:08 +053067 ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL);
68 if (ramp_delay)
Axel Lin086ccd42012-06-18 13:59:02 +080069 constraints->ramp_delay = be32_to_cpu(*ramp_delay);
Rajendra Nayak8f446e62011-11-18 16:47:17 +053070}
71
72/**
73 * of_get_regulator_init_data - extract regulator_init_data structure info
74 * @dev: device requesting for regulator_init_data
75 *
76 * Populates regulator_init_data structure by extracting data from device
77 * tree node, returns a pointer to the populated struture or NULL if memory
78 * alloc fails.
79 */
Shawn Guod9a861c2011-12-01 17:21:06 +080080struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
81 struct device_node *node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053082{
83 struct regulator_init_data *init_data;
84
Shawn Guod9a861c2011-12-01 17:21:06 +080085 if (!node)
Rajendra Nayak8f446e62011-11-18 16:47:17 +053086 return NULL;
87
88 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
89 if (!init_data)
90 return NULL; /* Out of memory? */
91
Shawn Guod9a861c2011-12-01 17:21:06 +080092 of_get_regulation_constraints(node, &init_data);
Rajendra Nayak8f446e62011-11-18 16:47:17 +053093 return init_data;
94}
Axel Line69af5e2011-11-26 18:50:58 +080095EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
Thierry Reding1c8fa582012-04-26 16:52:20 +020096
97/**
Stephen Warren13511de2012-09-24 13:25:00 -060098 * of_regulator_match - extract multiple regulator init data from device tree.
Thierry Reding1c8fa582012-04-26 16:52:20 +020099 * @dev: device requesting the data
100 * @node: parent device node of the regulators
101 * @matches: match table for the regulators
102 * @num_matches: number of entries in match table
103 *
Stephen Warren13511de2012-09-24 13:25:00 -0600104 * This function uses a match table specified by the regulator driver to
105 * parse regulator init data from the device tree. @node is expected to
106 * contain a set of child nodes, each providing the init data for one
107 * regulator. The data parsed from a child node will be matched to a regulator
108 * based on either the deprecated property regulator-compatible if present,
109 * or otherwise the child node's name. Note that the match table is modified
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530110 * in place.
Thierry Reding1c8fa582012-04-26 16:52:20 +0200111 *
112 * Returns the number of matches found or a negative error code on failure.
113 */
114int of_regulator_match(struct device *dev, struct device_node *node,
115 struct of_regulator_match *matches,
116 unsigned int num_matches)
117{
118 unsigned int count = 0;
119 unsigned int i;
Stephen Warren13511de2012-09-24 13:25:00 -0600120 const char *name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530121 struct device_node *child;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200122
123 if (!dev || !node)
124 return -EINVAL;
125
Stephen Warrena2f95c32013-01-29 12:01:13 -0700126 for (i = 0; i < num_matches; i++) {
127 struct of_regulator_match *match = &matches[i];
128 match->init_data = NULL;
129 match->of_node = NULL;
130 }
131
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530132 for_each_child_of_node(node, child) {
Stephen Warren13511de2012-09-24 13:25:00 -0600133 name = of_get_property(child,
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530134 "regulator-compatible", NULL);
Stephen Warren13511de2012-09-24 13:25:00 -0600135 if (!name)
136 name = child->name;
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530137 for (i = 0; i < num_matches; i++) {
138 struct of_regulator_match *match = &matches[i];
139 if (match->of_node)
140 continue;
Thierry Reding1c8fa582012-04-26 16:52:20 +0200141
Stephen Warren13511de2012-09-24 13:25:00 -0600142 if (strcmp(match->name, name))
Laxman Dewangan5260cd22012-06-20 17:53:06 +0530143 continue;
144
145 match->init_data =
146 of_get_regulator_init_data(dev, child);
147 if (!match->init_data) {
148 dev_err(dev,
149 "failed to parse DT for regulator %s\n",
150 child->name);
151 return -EINVAL;
152 }
153 match->of_node = child;
154 count++;
155 break;
156 }
Thierry Reding1c8fa582012-04-26 16:52:20 +0200157 }
158
159 return count;
160}
161EXPORT_SYMBOL_GPL(of_regulator_match);