1 /* 2 * Voltage regulation driver for active-semi ACT8945A PMIC 3 * 4 * Copyright (C) 2015 Atmel Corporation 5 * 6 * Author: Wenyou Yang <wenyou.yang@atmel.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/of_device.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/regulator/machine.h> 21 22 /** 23 * ACT8945A Global Register Map. 24 */ 25 #define ACT8945A_SYS_MODE 0x00 26 #define ACT8945A_SYS_CTRL 0x01 27 #define ACT8945A_SYS_UNLK_REGS 0x0b 28 #define ACT8945A_DCDC1_VSET1 0x20 29 #define ACT8945A_DCDC1_VSET2 0x21 30 #define ACT8945A_DCDC1_CTRL 0x22 31 #define ACT8945A_DCDC2_VSET1 0x30 32 #define ACT8945A_DCDC2_VSET2 0x31 33 #define ACT8945A_DCDC2_CTRL 0x32 34 #define ACT8945A_DCDC3_VSET1 0x40 35 #define ACT8945A_DCDC3_VSET2 0x41 36 #define ACT8945A_DCDC3_CTRL 0x42 37 #define ACT8945A_LDO1_VSET 0x50 38 #define ACT8945A_LDO1_CTRL 0x51 39 #define ACT8945A_LDO2_VSET 0x54 40 #define ACT8945A_LDO2_CTRL 0x55 41 #define ACT8945A_LDO3_VSET 0x60 42 #define ACT8945A_LDO3_CTRL 0x61 43 #define ACT8945A_LDO4_VSET 0x64 44 #define ACT8945A_LDO4_CTRL 0x65 45 46 /** 47 * Field Definitions. 48 */ 49 #define ACT8945A_ENA 0x80 /* ON - [7] */ 50 #define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */ 51 52 /** 53 * ACT8945A Voltage Number 54 */ 55 #define ACT8945A_VOLTAGE_NUM 64 56 57 enum { 58 ACT8945A_ID_DCDC1, 59 ACT8945A_ID_DCDC2, 60 ACT8945A_ID_DCDC3, 61 ACT8945A_ID_LDO1, 62 ACT8945A_ID_LDO2, 63 ACT8945A_ID_LDO3, 64 ACT8945A_ID_LDO4, 65 ACT8945A_REG_NUM, 66 }; 67 68 static const struct regulator_linear_range act8945a_voltage_ranges[] = { 69 REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000), 70 REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000), 71 REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000), 72 }; 73 74 static const struct regulator_ops act8945a_ops = { 75 .list_voltage = regulator_list_voltage_linear_range, 76 .map_voltage = regulator_map_voltage_linear_range, 77 .get_voltage_sel = regulator_get_voltage_sel_regmap, 78 .set_voltage_sel = regulator_set_voltage_sel_regmap, 79 .enable = regulator_enable_regmap, 80 .disable = regulator_disable_regmap, 81 .is_enabled = regulator_is_enabled_regmap, 82 }; 83 84 #define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \ 85 [_family##_ID_##_id] = { \ 86 .name = _name, \ 87 .supply_name = _supply, \ 88 .of_match = of_match_ptr("REG_"#_id), \ 89 .regulators_node = of_match_ptr("regulators"), \ 90 .id = _family##_ID_##_id, \ 91 .type = REGULATOR_VOLTAGE, \ 92 .ops = &act8945a_ops, \ 93 .n_voltages = ACT8945A_VOLTAGE_NUM, \ 94 .linear_ranges = act8945a_voltage_ranges, \ 95 .n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \ 96 .vsel_reg = _family##_##_id##_##_vsel_reg, \ 97 .vsel_mask = ACT8945A_VSEL_MASK, \ 98 .enable_reg = _family##_##_id##_CTRL, \ 99 .enable_mask = ACT8945A_ENA, \ 100 .owner = THIS_MODULE, \ 101 } 102 103 static const struct regulator_desc act8945a_regulators[] = { 104 ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"), 105 ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"), 106 ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"), 107 ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"), 108 ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"), 109 ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"), 110 ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"), 111 }; 112 113 static const struct regulator_desc act8945a_alt_regulators[] = { 114 ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"), 115 ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"), 116 ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"), 117 ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"), 118 ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"), 119 ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"), 120 ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"), 121 }; 122 123 static int act8945a_pmic_probe(struct platform_device *pdev) 124 { 125 struct regulator_config config = { }; 126 const struct regulator_desc *regulators; 127 struct regulator_dev *rdev; 128 struct regmap *regmap; 129 int i, num_regulators; 130 bool voltage_select; 131 132 regmap = dev_get_regmap(pdev->dev.parent, NULL); 133 if (!regmap) { 134 dev_err(&pdev->dev, 135 "could not retrieve regmap from parent device\n"); 136 return -EINVAL; 137 } 138 139 voltage_select = of_property_read_bool(pdev->dev.parent->of_node, 140 "active-semi,vsel-high"); 141 142 if (voltage_select) { 143 regulators = act8945a_alt_regulators; 144 num_regulators = ARRAY_SIZE(act8945a_alt_regulators); 145 } else { 146 regulators = act8945a_regulators; 147 num_regulators = ARRAY_SIZE(act8945a_regulators); 148 } 149 150 config.dev = &pdev->dev; 151 config.dev->of_node = pdev->dev.parent->of_node; 152 for (i = 0; i < num_regulators; i++) { 153 rdev = devm_regulator_register(&pdev->dev, ®ulators[i], &config); 154 if (IS_ERR(rdev)) { 155 dev_err(&pdev->dev, 156 "failed to register %s regulator\n", 157 regulators[i].name); 158 return PTR_ERR(rdev); 159 } 160 } 161 162 /* Unlock expert registers. */ 163 return regmap_write(regmap, ACT8945A_SYS_UNLK_REGS, 0xef); 164 } 165 166 static struct platform_driver act8945a_pmic_driver = { 167 .driver = { 168 .name = "act8945a-regulator", 169 }, 170 .probe = act8945a_pmic_probe, 171 }; 172 module_platform_driver(act8945a_pmic_driver); 173 174 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver"); 175 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); 176 MODULE_LICENSE("GPL"); 177