Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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 | |
Axel Lin | e69af5e | 2011-11-26 18:50:58 +0800 | [diff] [blame] | 13 | #include <linux/module.h> |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 14 | #include <linux/slab.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/regulator/machine.h> |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 17 | #include <linux/regulator/of_regulator.h> |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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; |
Yadwinder Singh Brar | 6f0b2c6 | 2012-06-11 17:41:08 +0530 | [diff] [blame] | 23 | const __be32 *min_uA, *max_uA, *ramp_delay; |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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; |
Mark Brown | ab62aa9 | 2011-12-05 10:58:41 +0000 | [diff] [blame] | 38 | /* Only one voltage? Then make sure it's set. */ |
Karol Lewandowski | 8a09304 | 2012-01-25 10:31:45 +0100 | [diff] [blame] | 39 | if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) |
Mark Brown | ab62aa9 | 2011-12-05 10:58:41 +0000 | [diff] [blame] | 40 | constraints->apply_uV = true; |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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; |
Yadwinder Singh Brar | 6f0b2c6 | 2012-06-11 17:41:08 +0530 | [diff] [blame] | 63 | |
| 64 | ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL); |
| 65 | if (ramp_delay) |
Axel Lin | 086ccd4 | 2012-06-18 13:59:02 +0800 | [diff] [blame] | 66 | constraints->ramp_delay = be32_to_cpu(*ramp_delay); |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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 | */ |
Shawn Guo | d9a861c | 2011-12-01 17:21:06 +0800 | [diff] [blame] | 77 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
| 78 | struct device_node *node) |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 79 | { |
| 80 | struct regulator_init_data *init_data; |
| 81 | |
Shawn Guo | d9a861c | 2011-12-01 17:21:06 +0800 | [diff] [blame] | 82 | if (!node) |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 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 | |
Shawn Guo | d9a861c | 2011-12-01 17:21:06 +0800 | [diff] [blame] | 89 | of_get_regulation_constraints(node, &init_data); |
Rajendra Nayak | 8f446e6 | 2011-11-18 16:47:17 +0530 | [diff] [blame] | 90 | return init_data; |
| 91 | } |
Axel Lin | e69af5e | 2011-11-26 18:50:58 +0800 | [diff] [blame] | 92 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 93 | |
| 94 | /** |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 95 | * of_regulator_match - extract multiple regulator init data from device tree. |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 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 | * |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 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 |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 107 | * in place. |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 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; |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 117 | const char *name; |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 118 | struct device_node *child; |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 119 | |
| 120 | if (!dev || !node) |
| 121 | return -EINVAL; |
| 122 | |
Stephen Warren | a2f95c3 | 2013-01-29 12:01:13 -0700 | [diff] [blame^] | 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 | |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 129 | for_each_child_of_node(node, child) { |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 130 | name = of_get_property(child, |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 131 | "regulator-compatible", NULL); |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 132 | if (!name) |
| 133 | name = child->name; |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 134 | for (i = 0; i < num_matches; i++) { |
| 135 | struct of_regulator_match *match = &matches[i]; |
| 136 | if (match->of_node) |
| 137 | continue; |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 138 | |
Stephen Warren | 13511de | 2012-09-24 13:25:00 -0600 | [diff] [blame] | 139 | if (strcmp(match->name, name)) |
Laxman Dewangan | 5260cd2 | 2012-06-20 17:53:06 +0530 | [diff] [blame] | 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 | } |
Thierry Reding | 1c8fa58 | 2012-04-26 16:52:20 +0200 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | return count; |
| 157 | } |
| 158 | EXPORT_SYMBOL_GPL(of_regulator_match); |