1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI LM363X Regulator Driver 4 * 5 * Copyright 2015 Texas Instruments 6 * 7 * Author: Milo Kim <milo.kim@ti.com> 8 */ 9 10 #include <linux/err.h> 11 #include <linux/kernel.h> 12 #include <linux/mfd/ti-lmu.h> 13 #include <linux/mfd/ti-lmu-register.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/platform_device.h> 18 #include <linux/regulator/driver.h> 19 #include <linux/regulator/of_regulator.h> 20 #include <linux/slab.h> 21 22 /* LM3631 */ 23 #define LM3631_BOOST_VSEL_MAX 0x25 24 #define LM3631_LDO_VSEL_MAX 0x28 25 #define LM3631_CONT_VSEL_MAX 0x03 26 #define LM3631_VBOOST_MIN 4500000 27 #define LM3631_VCONT_MIN 1800000 28 #define LM3631_VLDO_MIN 4000000 29 #define ENABLE_TIME_USEC 1000 30 31 /* LM3632 */ 32 #define LM3632_BOOST_VSEL_MAX 0x26 33 #define LM3632_LDO_VSEL_MAX 0x29 34 #define LM3632_VBOOST_MIN 4500000 35 #define LM3632_VLDO_MIN 4000000 36 37 /* Common */ 38 #define LM363X_STEP_50mV 50000 39 #define LM363X_STEP_500mV 500000 40 41 static const int ldo_cont_enable_time[] = { 42 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000, 43 }; 44 45 static int lm363x_regulator_enable_time(struct regulator_dev *rdev) 46 { 47 enum lm363x_regulator_id id = rdev_get_id(rdev); 48 unsigned int val, addr, mask; 49 50 switch (id) { 51 case LM3631_LDO_CONT: 52 addr = LM3631_REG_ENTIME_VCONT; 53 mask = LM3631_ENTIME_CONT_MASK; 54 break; 55 case LM3631_LDO_OREF: 56 addr = LM3631_REG_ENTIME_VOREF; 57 mask = LM3631_ENTIME_MASK; 58 break; 59 case LM3631_LDO_POS: 60 addr = LM3631_REG_ENTIME_VPOS; 61 mask = LM3631_ENTIME_MASK; 62 break; 63 case LM3631_LDO_NEG: 64 addr = LM3631_REG_ENTIME_VNEG; 65 mask = LM3631_ENTIME_MASK; 66 break; 67 default: 68 return 0; 69 } 70 71 if (regmap_read(rdev->regmap, addr, &val)) 72 return -EINVAL; 73 74 val = (val & mask) >> LM3631_ENTIME_SHIFT; 75 76 if (id == LM3631_LDO_CONT) 77 return ldo_cont_enable_time[val]; 78 else 79 return ENABLE_TIME_USEC * val; 80 } 81 82 static const struct regulator_ops lm363x_boost_voltage_table_ops = { 83 .list_voltage = regulator_list_voltage_linear, 84 .set_voltage_sel = regulator_set_voltage_sel_regmap, 85 .get_voltage_sel = regulator_get_voltage_sel_regmap, 86 }; 87 88 static const struct regulator_ops lm363x_regulator_voltage_table_ops = { 89 .list_voltage = regulator_list_voltage_linear, 90 .set_voltage_sel = regulator_set_voltage_sel_regmap, 91 .get_voltage_sel = regulator_get_voltage_sel_regmap, 92 .enable = regulator_enable_regmap, 93 .disable = regulator_disable_regmap, 94 .is_enabled = regulator_is_enabled_regmap, 95 .enable_time = lm363x_regulator_enable_time, 96 }; 97 98 static const struct regulator_desc lm363x_regulator_desc[] = { 99 /* LM3631 */ 100 { 101 .name = "vboost", 102 .of_match = "vboost", 103 .id = LM3631_BOOST, 104 .ops = &lm363x_boost_voltage_table_ops, 105 .n_voltages = LM3631_BOOST_VSEL_MAX + 1, 106 .min_uV = LM3631_VBOOST_MIN, 107 .uV_step = LM363X_STEP_50mV, 108 .type = REGULATOR_VOLTAGE, 109 .owner = THIS_MODULE, 110 .vsel_reg = LM3631_REG_VOUT_BOOST, 111 .vsel_mask = LM3631_VOUT_MASK, 112 }, 113 { 114 .name = "ldo_cont", 115 .of_match = "vcont", 116 .id = LM3631_LDO_CONT, 117 .ops = &lm363x_regulator_voltage_table_ops, 118 .n_voltages = LM3631_CONT_VSEL_MAX + 1, 119 .min_uV = LM3631_VCONT_MIN, 120 .uV_step = LM363X_STEP_500mV, 121 .type = REGULATOR_VOLTAGE, 122 .owner = THIS_MODULE, 123 .vsel_reg = LM3631_REG_VOUT_CONT, 124 .vsel_mask = LM3631_VOUT_CONT_MASK, 125 .enable_reg = LM3631_REG_LDO_CTRL2, 126 .enable_mask = LM3631_EN_CONT_MASK, 127 }, 128 { 129 .name = "ldo_oref", 130 .of_match = "voref", 131 .id = LM3631_LDO_OREF, 132 .ops = &lm363x_regulator_voltage_table_ops, 133 .n_voltages = LM3631_LDO_VSEL_MAX + 1, 134 .min_uV = LM3631_VLDO_MIN, 135 .uV_step = LM363X_STEP_50mV, 136 .type = REGULATOR_VOLTAGE, 137 .owner = THIS_MODULE, 138 .vsel_reg = LM3631_REG_VOUT_OREF, 139 .vsel_mask = LM3631_VOUT_MASK, 140 .enable_reg = LM3631_REG_LDO_CTRL1, 141 .enable_mask = LM3631_EN_OREF_MASK, 142 }, 143 { 144 .name = "ldo_vpos", 145 .of_match = "vpos", 146 .id = LM3631_LDO_POS, 147 .ops = &lm363x_regulator_voltage_table_ops, 148 .n_voltages = LM3631_LDO_VSEL_MAX + 1, 149 .min_uV = LM3631_VLDO_MIN, 150 .uV_step = LM363X_STEP_50mV, 151 .type = REGULATOR_VOLTAGE, 152 .owner = THIS_MODULE, 153 .vsel_reg = LM3631_REG_VOUT_POS, 154 .vsel_mask = LM3631_VOUT_MASK, 155 .enable_reg = LM3631_REG_LDO_CTRL1, 156 .enable_mask = LM3631_EN_VPOS_MASK, 157 }, 158 { 159 .name = "ldo_vneg", 160 .of_match = "vneg", 161 .id = LM3631_LDO_NEG, 162 .ops = &lm363x_regulator_voltage_table_ops, 163 .n_voltages = LM3631_LDO_VSEL_MAX + 1, 164 .min_uV = LM3631_VLDO_MIN, 165 .uV_step = LM363X_STEP_50mV, 166 .type = REGULATOR_VOLTAGE, 167 .owner = THIS_MODULE, 168 .vsel_reg = LM3631_REG_VOUT_NEG, 169 .vsel_mask = LM3631_VOUT_MASK, 170 .enable_reg = LM3631_REG_LDO_CTRL1, 171 .enable_mask = LM3631_EN_VNEG_MASK, 172 }, 173 /* LM3632 */ 174 { 175 .name = "vboost", 176 .of_match = "vboost", 177 .id = LM3632_BOOST, 178 .ops = &lm363x_boost_voltage_table_ops, 179 .n_voltages = LM3632_BOOST_VSEL_MAX + 1, 180 .min_uV = LM3632_VBOOST_MIN, 181 .uV_step = LM363X_STEP_50mV, 182 .type = REGULATOR_VOLTAGE, 183 .owner = THIS_MODULE, 184 .vsel_reg = LM3632_REG_VOUT_BOOST, 185 .vsel_mask = LM3632_VOUT_MASK, 186 }, 187 { 188 .name = "ldo_vpos", 189 .of_match = "vpos", 190 .id = LM3632_LDO_POS, 191 .ops = &lm363x_regulator_voltage_table_ops, 192 .n_voltages = LM3632_LDO_VSEL_MAX + 1, 193 .min_uV = LM3632_VLDO_MIN, 194 .uV_step = LM363X_STEP_50mV, 195 .type = REGULATOR_VOLTAGE, 196 .owner = THIS_MODULE, 197 .vsel_reg = LM3632_REG_VOUT_POS, 198 .vsel_mask = LM3632_VOUT_MASK, 199 .enable_reg = LM3632_REG_BIAS_CONFIG, 200 .enable_mask = LM3632_EN_VPOS_MASK, 201 }, 202 { 203 .name = "ldo_vneg", 204 .of_match = "vneg", 205 .id = LM3632_LDO_NEG, 206 .ops = &lm363x_regulator_voltage_table_ops, 207 .n_voltages = LM3632_LDO_VSEL_MAX + 1, 208 .min_uV = LM3632_VLDO_MIN, 209 .uV_step = LM363X_STEP_50mV, 210 .type = REGULATOR_VOLTAGE, 211 .owner = THIS_MODULE, 212 .vsel_reg = LM3632_REG_VOUT_NEG, 213 .vsel_mask = LM3632_VOUT_MASK, 214 .enable_reg = LM3632_REG_BIAS_CONFIG, 215 .enable_mask = LM3632_EN_VNEG_MASK, 216 }, 217 }; 218 219 static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, int id) 220 { 221 /* 222 * Check LCM_EN1/2_GPIO is configured. 223 * Those pins are used for enabling VPOS/VNEG LDOs. 224 * Do not use devm* here: the regulator core takes over the 225 * lifecycle management of the GPIO descriptor. 226 */ 227 switch (id) { 228 case LM3632_LDO_POS: 229 return gpiod_get_index_optional(dev, "enable", 0, 230 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); 231 case LM3632_LDO_NEG: 232 return gpiod_get_index_optional(dev, "enable", 1, 233 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); 234 default: 235 return NULL; 236 } 237 } 238 239 static int lm363x_regulator_probe(struct platform_device *pdev) 240 { 241 struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); 242 struct regmap *regmap = lmu->regmap; 243 struct regulator_config cfg = { }; 244 struct regulator_dev *rdev; 245 struct device *dev = &pdev->dev; 246 int id = pdev->id; 247 struct gpio_desc *gpiod; 248 int ret; 249 250 cfg.dev = dev; 251 cfg.regmap = regmap; 252 253 /* 254 * LM3632 LDOs can be controlled by external pin. 255 * Register update is required if the pin is used. 256 */ 257 gpiod = lm363x_regulator_of_get_enable_gpio(dev, id); 258 if (IS_ERR(gpiod)) 259 return PTR_ERR(gpiod); 260 261 if (gpiod) { 262 cfg.ena_gpiod = gpiod; 263 264 ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG, 265 LM3632_EXT_EN_MASK, 266 LM3632_EXT_EN_MASK); 267 if (ret) { 268 gpiod_put(gpiod); 269 dev_err(dev, "External pin err: %d\n", ret); 270 return ret; 271 } 272 } 273 274 rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg); 275 if (IS_ERR(rdev)) { 276 ret = PTR_ERR(rdev); 277 dev_err(dev, "[%d] regulator register err: %d\n", id, ret); 278 return ret; 279 } 280 281 return 0; 282 } 283 284 static struct platform_driver lm363x_regulator_driver = { 285 .probe = lm363x_regulator_probe, 286 .driver = { 287 .name = "lm363x-regulator", 288 }, 289 }; 290 291 module_platform_driver(lm363x_regulator_driver); 292 293 MODULE_DESCRIPTION("TI LM363X Regulator Driver"); 294 MODULE_AUTHOR("Milo Kim"); 295 MODULE_LICENSE("GPL v2"); 296 MODULE_ALIAS("platform:lm363x-regulator"); 297