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 13 #include <linux/module.h> 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 /* Only one voltage? Then make sure it's set. */ 38 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV) 39 constraints->apply_uV = true; 40 41 uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL); 42 if (uV_offset) 43 constraints->uV_offset = be32_to_cpu(*uV_offset); 44 min_uA = of_get_property(np, "regulator-min-microamp", NULL); 45 if (min_uA) 46 constraints->min_uA = be32_to_cpu(*min_uA); 47 max_uA = of_get_property(np, "regulator-max-microamp", NULL); 48 if (max_uA) 49 constraints->max_uA = be32_to_cpu(*max_uA); 50 51 /* Current change possible? */ 52 if (constraints->min_uA != constraints->max_uA) 53 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; 54 55 if (of_find_property(np, "regulator-boot-on", NULL)) 56 constraints->boot_on = true; 57 58 if (of_find_property(np, "regulator-always-on", NULL)) 59 constraints->always_on = true; 60 else /* status change should be possible if not always on. */ 61 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; 62 } 63 64 /** 65 * of_get_regulator_init_data - extract regulator_init_data structure info 66 * @dev: device requesting for regulator_init_data 67 * 68 * Populates regulator_init_data structure by extracting data from device 69 * tree node, returns a pointer to the populated struture or NULL if memory 70 * alloc fails. 71 */ 72 struct regulator_init_data *of_get_regulator_init_data(struct device *dev, 73 struct device_node *node) 74 { 75 struct regulator_init_data *init_data; 76 77 if (!node) 78 return NULL; 79 80 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); 81 if (!init_data) 82 return NULL; /* Out of memory? */ 83 84 of_get_regulation_constraints(node, &init_data); 85 return init_data; 86 } 87 EXPORT_SYMBOL_GPL(of_get_regulator_init_data); 88