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 .ramp_reg = MP5416_REG_CTL2, \ 71 .ramp_mask = MP5416_MASK_DVS_SLEWRATE, \ 72 .ramp_delay_table = mp5416_buck_ramp_table, \ 73 .n_ramp_values = ARRAY_SIZE(mp5416_buck_ramp_table), \ 74 .active_discharge_on = _dval, \ 75 .active_discharge_reg = _dreg, \ 76 .active_discharge_mask = _dval, \ 77 .owner = THIS_MODULE, \ 78 } 79 80 #define MP5416LDO(_name, _id, _dval) \ 81 [MP5416_LDO ## _id] = { \ 82 .id = MP5416_LDO ## _id, \ 83 .name = _name, \ 84 .of_match = _name, \ 85 .regulators_node = "regulators", \ 86 .ops = &mp5416_ldo_ops, \ 87 .min_uV = MP5416_VOLT2_MIN, \ 88 .uV_step = MP5416_VOLT2_STEP, \ 89 .n_voltages = MP5416_VOLT2_RANGE, \ 90 .vsel_reg = MP5416_REG_LDO ##_id, \ 91 .vsel_mask = MP5416_MASK_VSET, \ 92 .enable_reg = MP5416_REG_LDO ##_id, \ 93 .enable_mask = MP5416_REGULATOR_EN, \ 94 .active_discharge_on = _dval, \ 95 .active_discharge_reg = MP5416_REG_CTL2, \ 96 .active_discharge_mask = _dval, \ 97 .owner = THIS_MODULE, \ 98 } 99 100 enum mp5416_regulators { 101 MP5416_BUCK1, 102 MP5416_BUCK2, 103 MP5416_BUCK3, 104 MP5416_BUCK4, 105 MP5416_LDO1, 106 MP5416_LDO2, 107 MP5416_LDO3, 108 MP5416_LDO4, 109 MP5416_MAX_REGULATORS, 110 }; 111 112 static const struct regmap_config mp5416_regmap_config = { 113 .reg_bits = 8, 114 .val_bits = 8, 115 .max_register = 0x0d, 116 }; 117 118 /* Current limits array (in uA) 119 * ILIM1 & ILIM3 120 */ 121 static const unsigned int mp5416_I_limits1[] = { 122 3800000, 4600000, 5600000, 6800000 123 }; 124 125 /* ILIM2 & ILIM4 */ 126 static const unsigned int mp5416_I_limits2[] = { 127 2200000, 3200000, 4200000, 5200000 128 }; 129 130 /* 131 * DVS ramp rate BUCK1 to BUCK4 132 * 00: 32mV/us 133 * 01: 16mV/us 134 * 10: 8mV/us 135 * 11: 4mV/us 136 */ 137 static const unsigned int mp5416_buck_ramp_table[] = { 138 32000, 16000, 8000, 4000 139 }; 140 141 static const struct regulator_ops mp5416_ldo_ops = { 142 .enable = regulator_enable_regmap, 143 .disable = regulator_disable_regmap, 144 .is_enabled = regulator_is_enabled_regmap, 145 .list_voltage = regulator_list_voltage_linear, 146 .map_voltage = regulator_map_voltage_linear, 147 .get_voltage_sel = regulator_get_voltage_sel_regmap, 148 .set_voltage_sel = regulator_set_voltage_sel_regmap, 149 .set_active_discharge = regulator_set_active_discharge_regmap, 150 }; 151 152 static const struct regulator_ops mp5416_buck_ops = { 153 .enable = regulator_enable_regmap, 154 .disable = regulator_disable_regmap, 155 .is_enabled = regulator_is_enabled_regmap, 156 .list_voltage = regulator_list_voltage_linear, 157 .map_voltage = regulator_map_voltage_linear, 158 .get_voltage_sel = regulator_get_voltage_sel_regmap, 159 .set_voltage_sel = regulator_set_voltage_sel_regmap, 160 .set_active_discharge = regulator_set_active_discharge_regmap, 161 .get_current_limit = regulator_get_current_limit_regmap, 162 .set_current_limit = regulator_set_current_limit_regmap, 163 .set_ramp_delay = regulator_set_ramp_delay_regmap, 164 }; 165 166 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = { 167 MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1), 168 MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2), 169 MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1), 170 MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2), 171 MP5416LDO("ldo1", 1, BIT(4)), 172 MP5416LDO("ldo2", 2, BIT(3)), 173 MP5416LDO("ldo3", 3, BIT(2)), 174 MP5416LDO("ldo4", 4, BIT(1)), 175 }; 176 177 static int mp5416_i2c_probe(struct i2c_client *client) 178 { 179 struct device *dev = &client->dev; 180 struct regulator_config config = { NULL, }; 181 struct regulator_dev *rdev; 182 struct regmap *regmap; 183 int i; 184 185 regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config); 186 if (IS_ERR(regmap)) { 187 dev_err(dev, "Failed to allocate regmap!\n"); 188 return PTR_ERR(regmap); 189 } 190 191 config.dev = dev; 192 config.regmap = regmap; 193 194 for (i = 0; i < MP5416_MAX_REGULATORS; i++) { 195 rdev = devm_regulator_register(dev, 196 &mp5416_regulators_desc[i], 197 &config); 198 if (IS_ERR(rdev)) { 199 dev_err(dev, "Failed to register regulator!\n"); 200 return PTR_ERR(rdev); 201 } 202 } 203 204 return 0; 205 } 206 207 static const struct of_device_id mp5416_of_match[] = { 208 { .compatible = "mps,mp5416" }, 209 {}, 210 }; 211 MODULE_DEVICE_TABLE(of, mp5416_of_match); 212 213 static const struct i2c_device_id mp5416_id[] = { 214 { "mp5416", }, 215 { }, 216 }; 217 MODULE_DEVICE_TABLE(i2c, mp5416_id); 218 219 static struct i2c_driver mp5416_regulator_driver = { 220 .driver = { 221 .name = "mp5416", 222 .of_match_table = of_match_ptr(mp5416_of_match), 223 }, 224 .probe_new = mp5416_i2c_probe, 225 .id_table = mp5416_id, 226 }; 227 module_i2c_driver(mp5416_regulator_driver); 228 229 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); 230 MODULE_DESCRIPTION("MP5416 PMIC regulator driver"); 231 MODULE_LICENSE("GPL"); 232