1 /* 2 * Regulator driver for LP87565 PMIC 3 * 4 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation version 2. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/regmap.h> 14 15 #include <linux/mfd/lp87565.h> 16 17 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \ 18 _delay, _lr, _cr) \ 19 [_id] = { \ 20 .desc = { \ 21 .name = _name, \ 22 .supply_name = _of "-in", \ 23 .id = _id, \ 24 .of_match = of_match_ptr(_of), \ 25 .regulators_node = of_match_ptr("regulators"),\ 26 .ops = &_ops, \ 27 .n_voltages = _n, \ 28 .type = REGULATOR_VOLTAGE, \ 29 .owner = THIS_MODULE, \ 30 .vsel_reg = _vr, \ 31 .vsel_mask = _vm, \ 32 .enable_reg = _er, \ 33 .enable_mask = _em, \ 34 .ramp_delay = _delay, \ 35 .linear_ranges = _lr, \ 36 .n_linear_ranges = ARRAY_SIZE(_lr), \ 37 }, \ 38 .ctrl2_reg = _cr, \ 39 } 40 41 struct lp87565_regulator { 42 struct regulator_desc desc; 43 unsigned int ctrl2_reg; 44 }; 45 46 static const struct lp87565_regulator regulators[]; 47 48 static const struct regulator_linear_range buck0_1_2_3_ranges[] = { 49 REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000), 50 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), 51 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), 52 }; 53 54 static const unsigned int lp87565_buck_ramp_delay[] = { 55 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 56 }; 57 58 /* LP87565 BUCK current limit */ 59 static const unsigned int lp87565_buck_uA[] = { 60 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000, 61 }; 62 63 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev, 64 int ramp_delay) 65 { 66 int id = rdev_get_id(rdev); 67 struct lp87565 *lp87565 = rdev_get_drvdata(rdev); 68 unsigned int reg; 69 int ret; 70 71 if (ramp_delay <= 470) 72 reg = 7; 73 else if (ramp_delay <= 940) 74 reg = 6; 75 else if (ramp_delay <= 1900) 76 reg = 5; 77 else if (ramp_delay <= 3800) 78 reg = 4; 79 else if (ramp_delay <= 7500) 80 reg = 3; 81 else if (ramp_delay <= 10000) 82 reg = 2; 83 else if (ramp_delay <= 15000) 84 reg = 1; 85 else 86 reg = 0; 87 88 ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg, 89 LP87565_BUCK_CTRL_2_SLEW_RATE, 90 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE)); 91 if (ret) { 92 dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret); 93 return ret; 94 } 95 96 rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg]; 97 98 /* Conservatively give a 15% margin */ 99 rdev->constraints->ramp_delay = 100 rdev->constraints->ramp_delay * 85 / 100; 101 102 return 0; 103 } 104 105 static int lp87565_buck_set_current_limit(struct regulator_dev *rdev, 106 int min_uA, int max_uA) 107 { 108 int id = rdev_get_id(rdev); 109 struct lp87565 *lp87565 = rdev_get_drvdata(rdev); 110 int i; 111 112 for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) { 113 if (lp87565_buck_uA[i] >= min_uA && 114 lp87565_buck_uA[i] <= max_uA) 115 return regmap_update_bits(lp87565->regmap, 116 regulators[id].ctrl2_reg, 117 LP87565_BUCK_CTRL_2_ILIM, 118 i << __ffs(LP87565_BUCK_CTRL_2_ILIM)); 119 } 120 121 return -EINVAL; 122 } 123 124 static int lp87565_buck_get_current_limit(struct regulator_dev *rdev) 125 { 126 int id = rdev_get_id(rdev); 127 struct lp87565 *lp87565 = rdev_get_drvdata(rdev); 128 int ret; 129 unsigned int val; 130 131 ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val); 132 if (ret) 133 return ret; 134 135 val = (val & LP87565_BUCK_CTRL_2_ILIM) >> 136 __ffs(LP87565_BUCK_CTRL_2_ILIM); 137 138 return (val < ARRAY_SIZE(lp87565_buck_uA)) ? 139 lp87565_buck_uA[val] : -EINVAL; 140 } 141 142 /* Operations permitted on BUCK0, BUCK1 */ 143 static const struct regulator_ops lp87565_buck_ops = { 144 .is_enabled = regulator_is_enabled_regmap, 145 .enable = regulator_enable_regmap, 146 .disable = regulator_disable_regmap, 147 .get_voltage_sel = regulator_get_voltage_sel_regmap, 148 .set_voltage_sel = regulator_set_voltage_sel_regmap, 149 .list_voltage = regulator_list_voltage_linear_range, 150 .map_voltage = regulator_map_voltage_linear_range, 151 .set_voltage_time_sel = regulator_set_voltage_time_sel, 152 .set_ramp_delay = lp87565_buck_set_ramp_delay, 153 .set_current_limit = lp87565_buck_set_current_limit, 154 .get_current_limit = lp87565_buck_get_current_limit, 155 }; 156 157 static const struct lp87565_regulator regulators[] = { 158 LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops, 159 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET, 160 LP87565_REG_BUCK0_CTRL_1, 161 LP87565_BUCK_CTRL_1_EN, 3230, 162 buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2), 163 LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops, 164 256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET, 165 LP87565_REG_BUCK1_CTRL_1, 166 LP87565_BUCK_CTRL_1_EN, 3230, 167 buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2), 168 LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops, 169 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET, 170 LP87565_REG_BUCK2_CTRL_1, 171 LP87565_BUCK_CTRL_1_EN, 3230, 172 buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2), 173 LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops, 174 256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET, 175 LP87565_REG_BUCK3_CTRL_1, 176 LP87565_BUCK_CTRL_1_EN, 3230, 177 buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2), 178 LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops, 179 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET, 180 LP87565_REG_BUCK0_CTRL_1, 181 LP87565_BUCK_CTRL_1_EN | 182 LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230, 183 buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2), 184 LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops, 185 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET, 186 LP87565_REG_BUCK2_CTRL_1, 187 LP87565_BUCK_CTRL_1_EN, 3230, 188 buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2), 189 }; 190 191 static int lp87565_regulator_probe(struct platform_device *pdev) 192 { 193 struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent); 194 struct regulator_config config = { }; 195 struct regulator_dev *rdev; 196 int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3; 197 198 platform_set_drvdata(pdev, lp87565); 199 200 config.dev = &pdev->dev; 201 config.dev->of_node = lp87565->dev->of_node; 202 config.driver_data = lp87565; 203 config.regmap = lp87565->regmap; 204 205 if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) { 206 min_idx = LP87565_BUCK_10; 207 max_idx = LP87565_BUCK_23; 208 } 209 210 for (i = min_idx; i <= max_idx; i++) { 211 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, 212 &config); 213 if (IS_ERR(rdev)) { 214 dev_err(lp87565->dev, "failed to register %s regulator\n", 215 pdev->name); 216 return PTR_ERR(rdev); 217 } 218 } 219 220 return 0; 221 } 222 223 static const struct platform_device_id lp87565_regulator_id_table[] = { 224 { "lp87565-regulator", }, 225 { "lp87565-q1-regulator", }, 226 { /* sentinel */ } 227 }; 228 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table); 229 230 static struct platform_driver lp87565_regulator_driver = { 231 .driver = { 232 .name = "lp87565-pmic", 233 }, 234 .probe = lp87565_regulator_probe, 235 .id_table = lp87565_regulator_id_table, 236 }; 237 module_platform_driver(lp87565_regulator_driver); 238 239 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 240 MODULE_DESCRIPTION("LP87565 voltage regulator driver"); 241 MODULE_LICENSE("GPL v2"); 242