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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.4 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.5 * Copyright (c) 2024 Linaro Limited6 */7 8#include <linux/array_size.h>9#include <linux/bits.h>10#include <linux/device.h>11#include <linux/math.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/regmap.h>16#include <linux/regulator/driver.h>17 18#include <asm/byteorder.h>19 20#define DEFAULT_VOLTAGE_STEPPER_RATE 3840021 22#define LDO_STEPPER_CTL_REG 0x3b23#define STEP_RATE_MASK GENMASK(1, 0)24 25#define LDO_VSET_LB_REG 0x4026 27#define LDO_ENABLE_REG 0x4628#define ENABLE_BIT BIT(7)29 30struct pm8008_regulator {31 struct regmap *regmap;32 struct regulator_desc desc;33 unsigned int base;34};35 36struct pm8008_regulator_data {37 const char *name;38 const char *supply_name;39 unsigned int base;40 int min_dropout_uV;41 const struct linear_range *voltage_range;42};43 44static const struct linear_range nldo_ranges[] = {45 REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),46};47 48static const struct linear_range pldo_ranges[] = {49 REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),50};51 52static const struct pm8008_regulator_data pm8008_reg_data[] = {53 { "ldo1", "vdd-l1-l2", 0x4000, 225000, nldo_ranges, },54 { "ldo2", "vdd-l1-l2", 0x4100, 225000, nldo_ranges, },55 { "ldo3", "vdd-l3-l4", 0x4200, 300000, pldo_ranges, },56 { "ldo4", "vdd-l3-l4", 0x4300, 300000, pldo_ranges, },57 { "ldo5", "vdd-l5", 0x4400, 200000, pldo_ranges, },58 { "ldo6", "vdd-l6", 0x4500, 200000, pldo_ranges, },59 { "ldo7", "vdd-l7", 0x4600, 200000, pldo_ranges, },60};61 62static int pm8008_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)63{64 struct pm8008_regulator *preg = rdev_get_drvdata(rdev);65 unsigned int mV;66 __le16 val;67 int ret;68 69 ret = regulator_list_voltage_linear_range(rdev, sel);70 if (ret < 0)71 return ret;72 73 mV = DIV_ROUND_UP(ret, 1000);74 75 val = cpu_to_le16(mV);76 77 ret = regmap_bulk_write(preg->regmap, preg->base + LDO_VSET_LB_REG,78 &val, sizeof(val));79 if (ret < 0)80 return ret;81 82 return 0;83}84 85static int pm8008_regulator_get_voltage_sel(struct regulator_dev *rdev)86{87 struct pm8008_regulator *preg = rdev_get_drvdata(rdev);88 unsigned int uV;89 __le16 val;90 int ret;91 92 ret = regmap_bulk_read(preg->regmap, preg->base + LDO_VSET_LB_REG,93 &val, sizeof(val));94 if (ret < 0)95 return ret;96 97 uV = le16_to_cpu(val) * 1000;98 99 return (uV - preg->desc.min_uV) / preg->desc.uV_step;100}101 102static const struct regulator_ops pm8008_regulator_ops = {103 .list_voltage = regulator_list_voltage_linear,104 .set_voltage_sel = pm8008_regulator_set_voltage_sel,105 .get_voltage_sel = pm8008_regulator_get_voltage_sel,106 .enable = regulator_enable_regmap,107 .disable = regulator_disable_regmap,108 .is_enabled = regulator_is_enabled_regmap,109};110 111static int pm8008_regulator_probe(struct platform_device *pdev)112{113 const struct pm8008_regulator_data *data;114 struct regulator_config config = {};115 struct device *dev = &pdev->dev;116 struct pm8008_regulator *preg;117 struct regulator_desc *desc;118 struct regulator_dev *rdev;119 struct regmap *regmap;120 unsigned int val;121 int ret, i;122 123 regmap = dev_get_regmap(dev->parent, "secondary");124 if (!regmap)125 return -EINVAL;126 127 for (i = 0; i < ARRAY_SIZE(pm8008_reg_data); i++) {128 data = &pm8008_reg_data[i];129 130 preg = devm_kzalloc(dev, sizeof(*preg), GFP_KERNEL);131 if (!preg)132 return -ENOMEM;133 134 preg->regmap = regmap;135 preg->base = data->base;136 137 desc = &preg->desc;138 139 desc->name = data->name;140 desc->supply_name = data->supply_name;141 desc->of_match = data->name;142 desc->regulators_node = of_match_ptr("regulators");143 desc->ops = &pm8008_regulator_ops;144 desc->type = REGULATOR_VOLTAGE;145 desc->owner = THIS_MODULE;146 147 desc->linear_ranges = data->voltage_range;148 desc->n_linear_ranges = 1;149 desc->uV_step = desc->linear_ranges[0].step;150 desc->min_uV = desc->linear_ranges[0].min;151 desc->n_voltages = linear_range_values_in_range(&desc->linear_ranges[0]);152 153 ret = regmap_read(regmap, preg->base + LDO_STEPPER_CTL_REG, &val);154 if (ret < 0) {155 dev_err(dev, "failed to read step rate: %d\n", ret);156 return ret;157 }158 val &= STEP_RATE_MASK;159 desc->ramp_delay = DEFAULT_VOLTAGE_STEPPER_RATE >> val;160 161 desc->min_dropout_uV = data->min_dropout_uV;162 163 desc->enable_reg = preg->base + LDO_ENABLE_REG;164 desc->enable_mask = ENABLE_BIT;165 166 config.dev = dev->parent;167 config.driver_data = preg;168 config.regmap = regmap;169 170 rdev = devm_regulator_register(dev, desc, &config);171 if (IS_ERR(rdev)) {172 ret = PTR_ERR(rdev);173 dev_err(dev, "failed to register regulator %s: %d\n",174 desc->name, ret);175 return ret;176 }177 }178 179 return 0;180}181 182static const struct platform_device_id pm8008_regulator_id_table[] = {183 { "pm8008-regulator" },184 { }185};186MODULE_DEVICE_TABLE(platform, pm8008_regulator_id_table);187 188static struct platform_driver pm8008_regulator_driver = {189 .driver = {190 .name = "qcom-pm8008-regulator",191 },192 .probe = pm8008_regulator_probe,193 .id_table = pm8008_regulator_id_table,194};195module_platform_driver(pm8008_regulator_driver);196 197MODULE_DESCRIPTION("Qualcomm PM8008 PMIC regulator driver");198MODULE_LICENSE("GPL");199