1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // mp5416.c - regulator driver for mps mp5416 4 // 5 // Copyright 2020 Monolithic Power Systems, Inc 6 // 7 // Author: Saravanan Sekar <sravanhome@gmail.com> 8 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/err.h> 13 #include <linux/platform_device.h> 14 #include <linux/regmap.h> 15 #include <linux/regulator/driver.h> 16 #include <linux/i2c.h> 17 18 #define MP5416_REG_CTL0 0x00 19 #define MP5416_REG_CTL1 0x01 20 #define MP5416_REG_CTL2 0x02 21 #define MP5416_REG_ILIM 0x03 22 #define MP5416_REG_BUCK1 0x04 23 #define MP5416_REG_BUCK2 0x05 24 #define MP5416_REG_BUCK3 0x06 25 #define MP5416_REG_BUCK4 0x07 26 #define MP5416_REG_LDO1 0x08 27 #define MP5416_REG_LDO2 0x09 28 #define MP5416_REG_LDO3 0x0a 29 #define MP5416_REG_LDO4 0x0b 30 31 #define MP5416_REGULATOR_EN BIT(7) 32 #define MP5416_MASK_VSET 0x7f 33 #define MP5416_MASK_BUCK1_ILIM 0xc0 34 #define MP5416_MASK_BUCK2_ILIM 0x0c 35 #define MP5416_MASK_BUCK3_ILIM 0x30 36 #define MP5416_MASK_BUCK4_ILIM 0x03 37 #define MP5416_MASK_DVS_SLEWRATE 0xc0 38 39 /* values in uV */ 40 #define MP5416_VOLT1_MIN 600000 41 #define MP5416_VOLT1_MAX 2187500 42 #define MP5416_VOLT1_STEP 12500 43 #define MP5416_VOLT2_MIN 800000 44 #define MP5416_VOLT2_MAX 3975000 45 #define MP5416_VOLT2_STEP 25000 46 47 #define MP5416_VOLT1_RANGE \ 48 ((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1) 49 #define MP5416_VOLT2_RANGE \ 50 ((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1) 51 52 #define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel) \ 53 [MP5416_BUCK ## _id] = { \ 54 .id = MP5416_BUCK ## _id, \ 55 .name = _name, \ 56 .of_match = _name, \ 57 .regulators_node = "regulators", \ 58 .ops = &mp5416_buck_ops, \ 59 .min_uV = MP5416_VOLT ##_vsel## _MIN, \ 60 .uV_step = MP5416_VOLT ##_vsel## _STEP, \ 61 .n_voltages = MP5416_VOLT ##_vsel## _RANGE, \ 62 .curr_table = _ilim, \ 63 .n_current_limits = ARRAY_SIZE(_ilim), \ 64 .csel_reg = MP5416_REG_ILIM, \ 65 .csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM, \ 66 .vsel_reg = MP5416_REG_BUCK ## _id, \ 67 .vsel_mask = MP5416_MASK_VSET, \ 68 .enable_reg = MP5416_REG_BUCK ## _id, \ 69 .enable_mask = MP5416_REGULATOR_EN, \ 70 .active_discharge_on = _dval, \ 71 .active_discharge_reg = _dreg, \ 72 .active_discharge_mask = _dval, \ 73 .owner = THIS_MODULE, \ 74 } 75 76 #define MP5416LDO(_name, _id, _dval) \ 77 [MP5416_LDO ## _id] = { \ 78 .id = MP5416_LDO ## _id, \ 79 .name = _name, \ 80 .of_match = _name, \ 81 .regulators_node = "regulators", \ 82 .ops = &mp5416_ldo_ops, \ 83 .min_uV = MP5416_VOLT2_MIN, \ 84 .uV_step = MP5416_VOLT2_STEP, \ 85 .n_voltages = MP5416_VOLT2_RANGE, \ 86 .vsel_reg = MP5416_REG_LDO ##_id, \ 87 .vsel_mask = MP5416_MASK_VSET, \ 88 .enable_reg = MP5416_REG_LDO ##_id, \ 89 .enable_mask = MP5416_REGULATOR_EN, \ 90 .active_discharge_on = _dval, \ 91 .active_discharge_reg = MP5416_REG_CTL2, \ 92 .active_discharge_mask = _dval, \ 93 .owner = THIS_MODULE, \ 94 } 95 96 enum mp5416_regulators { 97 MP5416_BUCK1, 98 MP5416_BUCK2, 99 MP5416_BUCK3, 100 MP5416_BUCK4, 101 MP5416_LDO1, 102 MP5416_LDO2, 103 MP5416_LDO3, 104 MP5416_LDO4, 105 MP5416_MAX_REGULATORS, 106 }; 107 108 static const struct regmap_config mp5416_regmap_config = { 109 .reg_bits = 8, 110 .val_bits = 8, 111 .max_register = 0x0d, 112 }; 113 114 /* Current limits array (in uA) 115 * ILIM1 & ILIM3 116 */ 117 static const unsigned int mp5416_I_limits1[] = { 118 3800000, 4600000, 5600000, 6800000 119 }; 120 121 /* ILIM2 & ILIM4 */ 122 static const unsigned int mp5416_I_limits2[] = { 123 2200000, 3200000, 4200000, 5200000 124 }; 125 126 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay); 127 128 static const struct regulator_ops mp5416_ldo_ops = { 129 .enable = regulator_enable_regmap, 130 .disable = regulator_disable_regmap, 131 .is_enabled = regulator_is_enabled_regmap, 132 .list_voltage = regulator_list_voltage_linear, 133 .map_voltage = regulator_map_voltage_linear, 134 .get_voltage_sel = regulator_get_voltage_sel_regmap, 135 .set_voltage_sel = regulator_set_voltage_sel_regmap, 136 .set_active_discharge = regulator_set_active_discharge_regmap, 137 }; 138 139 static const struct regulator_ops mp5416_buck_ops = { 140 .enable = regulator_enable_regmap, 141 .disable = regulator_disable_regmap, 142 .is_enabled = regulator_is_enabled_regmap, 143 .list_voltage = regulator_list_voltage_linear, 144 .map_voltage = regulator_map_voltage_linear, 145 .get_voltage_sel = regulator_get_voltage_sel_regmap, 146 .set_voltage_sel = regulator_set_voltage_sel_regmap, 147 .set_active_discharge = regulator_set_active_discharge_regmap, 148 .get_current_limit = regulator_get_current_limit_regmap, 149 .set_current_limit = regulator_set_current_limit_regmap, 150 .set_ramp_delay = mp5416_set_ramp_delay, 151 }; 152 153 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = { 154 MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1), 155 MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2), 156 MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1), 157 MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2), 158 MP5416LDO("ldo1", 1, BIT(4)), 159 MP5416LDO("ldo2", 2, BIT(3)), 160 MP5416LDO("ldo3", 3, BIT(2)), 161 MP5416LDO("ldo4", 4, BIT(1)), 162 }; 163 164 /* 165 * DVS ramp rate BUCK1 to BUCK4 166 * 00: 32mV/us 167 * 01: 16mV/us 168 * 10: 8mV/us 169 * 11: 4mV/us 170 */ 171 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) 172 { 173 unsigned int ramp_val; 174 175 if (ramp_delay > 32000 || ramp_delay < 0) 176 return -EINVAL; 177 178 if (ramp_delay <= 4000) 179 ramp_val = 3; 180 else if (ramp_delay <= 8000) 181 ramp_val = 2; 182 else if (ramp_delay <= 16000) 183 ramp_val = 1; 184 else 185 ramp_val = 0; 186 187 return regmap_update_bits(rdev->regmap, MP5416_REG_CTL2, 188 MP5416_MASK_DVS_SLEWRATE, ramp_val << 6); 189 } 190 191 static int mp5416_i2c_probe(struct i2c_client *client) 192 { 193 struct device *dev = &client->dev; 194 struct regulator_config config = { NULL, }; 195 struct regulator_dev *rdev; 196 struct regmap *regmap; 197 int i; 198 199 regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config); 200 if (IS_ERR(regmap)) { 201 dev_err(dev, "Failed to allocate regmap!\n"); 202 return PTR_ERR(regmap); 203 } 204 205 config.dev = dev; 206 config.regmap = regmap; 207 208 for (i = 0; i < MP5416_MAX_REGULATORS; i++) { 209 rdev = devm_regulator_register(dev, 210 &mp5416_regulators_desc[i], 211 &config); 212 if (IS_ERR(rdev)) { 213 dev_err(dev, "Failed to register regulator!\n"); 214 return PTR_ERR(rdev); 215 } 216 } 217 218 return 0; 219 } 220 221 static const struct of_device_id mp5416_of_match[] = { 222 { .compatible = "mps,mp5416" }, 223 {}, 224 }; 225 MODULE_DEVICE_TABLE(of, mp5416_of_match); 226 227 static const struct i2c_device_id mp5416_id[] = { 228 { "mp5416", }, 229 { }, 230 }; 231 MODULE_DEVICE_TABLE(i2c, mp5416_id); 232 233 static struct i2c_driver mp5416_regulator_driver = { 234 .driver = { 235 .name = "mp5416", 236 .of_match_table = of_match_ptr(mp5416_of_match), 237 }, 238 .probe_new = mp5416_i2c_probe, 239 .id_table = mp5416_id, 240 }; 241 module_i2c_driver(mp5416_regulator_driver); 242 243 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); 244 MODULE_DESCRIPTION("MP5416 PMIC regulator driver"); 245 MODULE_LICENSE("GPL"); 246