1 /* 2 * Regulator driver for LP873X PMIC 3 * 4 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether expressed or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License version 2 for more details. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 20 #include <linux/mfd/lp873x.h> 21 22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \ 23 _delay, _lr, _cr) \ 24 [_id] = { \ 25 .desc = { \ 26 .name = _name, \ 27 .supply_name = _of "-in", \ 28 .id = _id, \ 29 .of_match = of_match_ptr(_of), \ 30 .regulators_node = of_match_ptr("regulators"),\ 31 .ops = &_ops, \ 32 .n_voltages = _n, \ 33 .type = REGULATOR_VOLTAGE, \ 34 .owner = THIS_MODULE, \ 35 .vsel_reg = _vr, \ 36 .vsel_mask = _vm, \ 37 .enable_reg = _er, \ 38 .enable_mask = _em, \ 39 .ramp_delay = _delay, \ 40 .linear_ranges = _lr, \ 41 .n_linear_ranges = ARRAY_SIZE(_lr), \ 42 .curr_table = lp873x_buck_uA, \ 43 .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \ 44 .csel_reg = (_cr), \ 45 .csel_mask = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\ 46 }, \ 47 .ctrl2_reg = _cr, \ 48 } 49 50 struct lp873x_regulator { 51 struct regulator_desc desc; 52 unsigned int ctrl2_reg; 53 }; 54 55 static const struct lp873x_regulator regulators[]; 56 57 static const struct linear_range buck0_buck1_ranges[] = { 58 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0), 59 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000), 60 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), 61 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), 62 }; 63 64 static const struct linear_range ldo0_ldo1_ranges[] = { 65 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000), 66 }; 67 68 static const unsigned int lp873x_buck_ramp_delay[] = { 69 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 70 }; 71 72 /* LP873X BUCK current limit */ 73 static const unsigned int lp873x_buck_uA[] = { 74 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 75 }; 76 77 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev, 78 int ramp_delay) 79 { 80 int id = rdev_get_id(rdev); 81 struct lp873x *lp873 = rdev_get_drvdata(rdev); 82 unsigned int reg; 83 int ret; 84 85 if (ramp_delay <= 470) 86 reg = 7; 87 else if (ramp_delay <= 940) 88 reg = 6; 89 else if (ramp_delay <= 1900) 90 reg = 5; 91 else if (ramp_delay <= 3800) 92 reg = 4; 93 else if (ramp_delay <= 7500) 94 reg = 3; 95 else if (ramp_delay <= 10000) 96 reg = 2; 97 else if (ramp_delay <= 15000) 98 reg = 1; 99 else 100 reg = 0; 101 102 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg, 103 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, 104 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE)); 105 if (ret) { 106 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret); 107 return ret; 108 } 109 110 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg]; 111 112 return 0; 113 } 114 115 /* Operations permitted on BUCK0, BUCK1 */ 116 static const struct regulator_ops lp873x_buck01_ops = { 117 .is_enabled = regulator_is_enabled_regmap, 118 .enable = regulator_enable_regmap, 119 .disable = regulator_disable_regmap, 120 .get_voltage_sel = regulator_get_voltage_sel_regmap, 121 .set_voltage_sel = regulator_set_voltage_sel_regmap, 122 .list_voltage = regulator_list_voltage_linear_range, 123 .map_voltage = regulator_map_voltage_linear_range, 124 .set_voltage_time_sel = regulator_set_voltage_time_sel, 125 .set_ramp_delay = lp873x_buck_set_ramp_delay, 126 .set_current_limit = regulator_set_current_limit_regmap, 127 .get_current_limit = regulator_get_current_limit_regmap, 128 }; 129 130 /* Operations permitted on LDO0 and LDO1 */ 131 static const struct regulator_ops lp873x_ldo01_ops = { 132 .is_enabled = regulator_is_enabled_regmap, 133 .enable = regulator_enable_regmap, 134 .disable = regulator_disable_regmap, 135 .get_voltage_sel = regulator_get_voltage_sel_regmap, 136 .set_voltage_sel = regulator_set_voltage_sel_regmap, 137 .list_voltage = regulator_list_voltage_linear_range, 138 .map_voltage = regulator_map_voltage_linear_range, 139 }; 140 141 static const struct lp873x_regulator regulators[] = { 142 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops, 143 256, LP873X_REG_BUCK0_VOUT, 144 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1, 145 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000, 146 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2), 147 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops, 148 256, LP873X_REG_BUCK1_VOUT, 149 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1, 150 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000, 151 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2), 152 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26, 153 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET, 154 LP873X_REG_LDO0_CTRL, 155 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF), 156 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26, 157 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET, 158 LP873X_REG_LDO1_CTRL, 159 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF), 160 }; 161 162 static int lp873x_regulator_probe(struct platform_device *pdev) 163 { 164 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent); 165 struct regulator_config config = { }; 166 struct regulator_dev *rdev; 167 int i; 168 169 platform_set_drvdata(pdev, lp873); 170 171 config.dev = &pdev->dev; 172 config.dev->of_node = lp873->dev->of_node; 173 config.driver_data = lp873; 174 config.regmap = lp873->regmap; 175 176 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 177 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, 178 &config); 179 if (IS_ERR(rdev)) { 180 dev_err(lp873->dev, "failed to register %s regulator\n", 181 pdev->name); 182 return PTR_ERR(rdev); 183 } 184 } 185 186 return 0; 187 } 188 189 static const struct platform_device_id lp873x_regulator_id_table[] = { 190 { "lp873x-regulator", }, 191 { /* sentinel */ } 192 }; 193 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table); 194 195 static struct platform_driver lp873x_regulator_driver = { 196 .driver = { 197 .name = "lp873x-pmic", 198 }, 199 .probe = lp873x_regulator_probe, 200 .id_table = lp873x_regulator_id_table, 201 }; 202 module_platform_driver(lp873x_regulator_driver); 203 204 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 205 MODULE_DESCRIPTION("LP873X voltage regulator driver"); 206 MODULE_ALIAS("platform:lp873x-pmic"); 207 MODULE_LICENSE("GPL v2"); 208