| 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> |
| 17 | |
| 18 | static void of_get_regulation_constraints(struct device_node *np, |
| 19 | struct regulator_init_data **init_data) |
| 20 | { |
| 21 | const __be32 *min_uV, *max_uV, *uV_offset; |
| 22 | const __be32 *min_uA, *max_uA; |
| 23 | struct regulation_constraints *constraints = &(*init_data)->constraints; |
| 24 | |
| 25 | constraints->name = of_get_property(np, "regulator-name", NULL); |
| 26 | |
| 27 | min_uV = of_get_property(np, "regulator-min-microvolt", NULL); |
| 28 | if (min_uV) |
| 29 | constraints->min_uV = be32_to_cpu(*min_uV); |
| 30 | max_uV = of_get_property(np, "regulator-max-microvolt", NULL); |
| 31 | if (max_uV) |
| 32 | constraints->max_uV = be32_to_cpu(*max_uV); |
| 33 | |
| 34 | /* Voltage change possible? */ |
| 35 | if (constraints->min_uV != constraints->max_uV) |
| 36 | constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; |
| 37 | |
| 38 | uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL); |
| 39 | if (uV_offset) |
| 40 | constraints->uV_offset = be32_to_cpu(*uV_offset); |
| 41 | min_uA = of_get_property(np, "regulator-min-microamp", NULL); |
| 42 | if (min_uA) |
| 43 | constraints->min_uA = be32_to_cpu(*min_uA); |
| 44 | max_uA = of_get_property(np, "regulator-max-microamp", NULL); |
| 45 | if (max_uA) |
| 46 | constraints->max_uA = be32_to_cpu(*max_uA); |
| 47 | |
| 48 | /* Current change possible? */ |
| 49 | if (constraints->min_uA != constraints->max_uA) |
| 50 | constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; |
| 51 | |
| 52 | if (of_find_property(np, "regulator-boot-on", NULL)) |
| 53 | constraints->boot_on = true; |
| 54 | |
| 55 | if (of_find_property(np, "regulator-always-on", NULL)) |
| 56 | constraints->always_on = true; |
| 57 | else /* status change should be possible if not always on. */ |
| 58 | constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * of_get_regulator_init_data - extract regulator_init_data structure info |
| 63 | * @dev: device requesting for regulator_init_data |
| 64 | * |
| 65 | * Populates regulator_init_data structure by extracting data from device |
| 66 | * tree node, returns a pointer to the populated struture or NULL if memory |
| 67 | * alloc fails. |
| 68 | */ |
| 69 | struct regulator_init_data *of_get_regulator_init_data(struct device *dev) |
| 70 | { |
| 71 | struct regulator_init_data *init_data; |
| 72 | |
| 73 | if (!dev->of_node) |
| 74 | return NULL; |
| 75 | |
| 76 | init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); |
| 77 | if (!init_data) |
| 78 | return NULL; /* Out of memory? */ |
| 79 | |
| 80 | of_get_regulation_constraints(dev->of_node, &init_data); |
| 81 | return init_data; |
| 82 | } |
| Axel Lin | e69af5e | 2011-11-26 18:50:58 +0800 | [diff] [blame^] | 83 | EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |