1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies 4 * 5 * Copyright (C) 2012 Renesas Electronics Corporation 6 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> 7 */ 8 9 #include <linux/err.h> 10 #include <linux/init.h> 11 #include <linux/mfd/as3711.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/regmap.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/of_regulator.h> 18 #include <linux/slab.h> 19 20 /* 21 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and 22 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes: 23 * FAST: sdX_fast=1 24 * NORMAL: low_noise=1 25 * IDLE: low_noise=0 26 */ 27 28 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode) 29 { 30 unsigned int fast_bit = rdev->desc->enable_mask, 31 low_noise_bit = fast_bit << 4; 32 u8 val; 33 34 switch (mode) { 35 case REGULATOR_MODE_FAST: 36 val = fast_bit | low_noise_bit; 37 break; 38 case REGULATOR_MODE_NORMAL: 39 val = low_noise_bit; 40 break; 41 case REGULATOR_MODE_IDLE: 42 val = 0; 43 break; 44 default: 45 return -EINVAL; 46 } 47 48 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1, 49 low_noise_bit | fast_bit, val); 50 } 51 52 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev) 53 { 54 unsigned int fast_bit = rdev->desc->enable_mask, 55 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit; 56 unsigned int val; 57 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val); 58 59 if (ret < 0) 60 return ret; 61 62 if ((val & mask) == mask) 63 return REGULATOR_MODE_FAST; 64 65 if ((val & mask) == low_noise_bit) 66 return REGULATOR_MODE_NORMAL; 67 68 if (!(val & mask)) 69 return REGULATOR_MODE_IDLE; 70 71 return -EINVAL; 72 } 73 74 static const struct regulator_ops as3711_sd_ops = { 75 .is_enabled = regulator_is_enabled_regmap, 76 .enable = regulator_enable_regmap, 77 .disable = regulator_disable_regmap, 78 .get_voltage_sel = regulator_get_voltage_sel_regmap, 79 .set_voltage_sel = regulator_set_voltage_sel_regmap, 80 .list_voltage = regulator_list_voltage_linear_range, 81 .map_voltage = regulator_map_voltage_linear_range, 82 .get_mode = as3711_get_mode_sd, 83 .set_mode = as3711_set_mode_sd, 84 }; 85 86 static const struct regulator_ops as3711_aldo_ops = { 87 .is_enabled = regulator_is_enabled_regmap, 88 .enable = regulator_enable_regmap, 89 .disable = regulator_disable_regmap, 90 .get_voltage_sel = regulator_get_voltage_sel_regmap, 91 .set_voltage_sel = regulator_set_voltage_sel_regmap, 92 .list_voltage = regulator_list_voltage_linear_range, 93 .map_voltage = regulator_map_voltage_linear_range, 94 }; 95 96 static const struct regulator_ops as3711_dldo_ops = { 97 .is_enabled = regulator_is_enabled_regmap, 98 .enable = regulator_enable_regmap, 99 .disable = regulator_disable_regmap, 100 .get_voltage_sel = regulator_get_voltage_sel_regmap, 101 .set_voltage_sel = regulator_set_voltage_sel_regmap, 102 .list_voltage = regulator_list_voltage_linear_range, 103 .map_voltage = regulator_map_voltage_linear_range, 104 }; 105 106 static const struct linear_range as3711_sd_ranges[] = { 107 REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500), 108 REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000), 109 REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000), 110 }; 111 112 static const struct linear_range as3711_aldo_ranges[] = { 113 REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000), 114 REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000), 115 }; 116 117 static const struct linear_range as3711_dldo_ranges[] = { 118 REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000), 119 REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000), 120 }; 121 122 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \ 123 [AS3711_REGULATOR_ ## _id] = { \ 124 .name = "as3711-regulator-" # _id, \ 125 .id = AS3711_REGULATOR_ ## _id, \ 126 .n_voltages = (_vmask + 1), \ 127 .ops = &as3711_ ## _sfx ## _ops, \ 128 .type = REGULATOR_VOLTAGE, \ 129 .owner = THIS_MODULE, \ 130 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \ 131 .vsel_mask = _vmask, \ 132 .enable_reg = AS3711_ ## _en_reg, \ 133 .enable_mask = BIT(_en_bit), \ 134 .linear_ranges = as3711_ ## _sfx ## _ranges, \ 135 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \ 136 } 137 138 static const struct regulator_desc as3711_reg_desc[] = { 139 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd), 140 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd), 141 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd), 142 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd), 143 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo), 144 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo), 145 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo), 146 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo), 147 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo), 148 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo), 149 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo), 150 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo), 151 /* StepUp output voltage depends on supplying regulator */ 152 }; 153 154 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_desc) 155 156 static struct of_regulator_match 157 as3711_regulator_matches[AS3711_REGULATOR_NUM] = { 158 [AS3711_REGULATOR_SD_1] = { .name = "sd1" }, 159 [AS3711_REGULATOR_SD_2] = { .name = "sd2" }, 160 [AS3711_REGULATOR_SD_3] = { .name = "sd3" }, 161 [AS3711_REGULATOR_SD_4] = { .name = "sd4" }, 162 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" }, 163 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" }, 164 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" }, 165 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" }, 166 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" }, 167 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" }, 168 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" }, 169 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" }, 170 }; 171 172 static int as3711_regulator_parse_dt(struct device *dev, 173 struct device_node **of_node, const int count) 174 { 175 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev); 176 struct device_node *regulators = 177 of_get_child_by_name(dev->parent->of_node, "regulators"); 178 struct of_regulator_match *match; 179 int ret, i; 180 181 if (!regulators) { 182 dev_err(dev, "regulator node not found\n"); 183 return -ENODEV; 184 } 185 186 ret = of_regulator_match(dev->parent, regulators, 187 as3711_regulator_matches, count); 188 of_node_put(regulators); 189 if (ret < 0) { 190 dev_err(dev, "Error parsing regulator init data: %d\n", ret); 191 return ret; 192 } 193 194 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++) 195 if (match->of_node) { 196 pdata->init_data[i] = match->init_data; 197 of_node[i] = match->of_node; 198 } 199 200 return 0; 201 } 202 203 static int as3711_regulator_probe(struct platform_device *pdev) 204 { 205 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev); 206 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent); 207 struct regulator_config config = {.dev = &pdev->dev,}; 208 struct device_node *of_node[AS3711_REGULATOR_NUM] = {}; 209 struct regulator_dev *rdev; 210 int ret; 211 int id; 212 213 if (!pdata) { 214 dev_err(&pdev->dev, "No platform data...\n"); 215 return -ENODEV; 216 } 217 218 if (pdev->dev.parent->of_node) { 219 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM); 220 if (ret < 0) { 221 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret); 222 return ret; 223 } 224 } 225 226 for (id = 0; id < AS3711_REGULATOR_NUM; id++) { 227 config.init_data = pdata->init_data[id]; 228 config.regmap = as3711->regmap; 229 config.of_node = of_node[id]; 230 231 rdev = devm_regulator_register(&pdev->dev, &as3711_reg_desc[id], 232 &config); 233 if (IS_ERR(rdev)) { 234 dev_err(&pdev->dev, "Failed to register regulator %s\n", 235 as3711_reg_desc[id].name); 236 return PTR_ERR(rdev); 237 } 238 } 239 240 return 0; 241 } 242 243 static struct platform_driver as3711_regulator_driver = { 244 .driver = { 245 .name = "as3711-regulator", 246 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 247 }, 248 .probe = as3711_regulator_probe, 249 }; 250 251 static int __init as3711_regulator_init(void) 252 { 253 return platform_driver_register(&as3711_regulator_driver); 254 } 255 subsys_initcall(as3711_regulator_init); 256 257 static void __exit as3711_regulator_exit(void) 258 { 259 platform_driver_unregister(&as3711_regulator_driver); 260 } 261 module_exit(as3711_regulator_exit); 262 263 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 264 MODULE_DESCRIPTION("AS3711 regulator driver"); 265 MODULE_ALIAS("platform:as3711-regulator"); 266 MODULE_LICENSE("GPL v2"); 267