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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) 2023 Analog Devices, Inc.4 * ADI regulator driver for MAX77503.5 */6 7#include <linux/i2c.h>8#include <linux/module.h>9#include <linux/regmap.h>10#include <linux/regulator/driver.h>11#include <linux/regulator/machine.h>12#include <linux/regulator/of_regulator.h>13#include <linux/util_macros.h>14 15#define MAX77503_REG_CFG 0x0016#define MAX77503_REG_VOUT 0x0117 18#define MAX77503_BIT_EN BIT(0)19#define MAX77503_BIT_CURR_LIM BIT(3)20#define MAX77503_BIT_ADEN BIT(6)21 22#define MAX77503_BITS_SOFT_START GENMASK(5, 4)23#define MAX77503_BITS_MX_VOUT GENMASK(7, 0)24 25#define MAX77503_AD_ENABLED 0x126#define MAX77503_AD_DISABLED 0x027 28static const struct regmap_config max77503_regmap_config = {29 .reg_bits = 8,30 .val_bits = 8,31 .max_register = 0x2,32};33 34static const struct regulator_ops max77503_buck_ops = {35 .list_voltage = regulator_list_voltage_linear_range,36 .map_voltage = regulator_map_voltage_ascend,37 .is_enabled = regulator_is_enabled_regmap,38 .enable = regulator_enable_regmap,39 .disable = regulator_disable_regmap,40 .get_voltage_sel = regulator_get_voltage_sel_regmap,41 .set_voltage_sel = regulator_set_voltage_sel_regmap,42 .get_current_limit = regulator_get_current_limit_regmap,43 .set_current_limit = regulator_set_current_limit_regmap,44 .set_active_discharge = regulator_set_active_discharge_regmap,45 .set_soft_start = regulator_set_soft_start_regmap,46};47 48static const struct linear_range max77503_buck_ranges[] = {49 REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000)50};51 52static const unsigned int max77503_current_limit_table[] = {53 500000, 200000054};55 56static const struct regulator_desc max77503_regulators_desc = {57 .name = "max77503",58 .enable_reg = MAX77503_REG_CFG,59 .enable_mask = MAX77503_BIT_EN,60 .ops = &max77503_buck_ops,61 .type = REGULATOR_VOLTAGE,62 .linear_ranges = max77503_buck_ranges,63 .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges),64 .vsel_reg = MAX77503_REG_VOUT,65 .vsel_mask = MAX77503_BITS_MX_VOUT,66 .soft_start_reg = MAX77503_REG_CFG,67 .soft_start_mask = MAX77503_BITS_SOFT_START,68 .active_discharge_reg = MAX77503_REG_CFG,69 .active_discharge_mask = MAX77503_BIT_ADEN,70 .active_discharge_off = MAX77503_AD_DISABLED,71 .active_discharge_on = MAX77503_AD_ENABLED,72 .csel_reg = MAX77503_REG_CFG,73 .csel_mask = MAX77503_BIT_CURR_LIM,74 .curr_table = max77503_current_limit_table,75 .n_current_limits = ARRAY_SIZE(max77503_current_limit_table),76 .owner = THIS_MODULE,77};78 79static int max77503_regulator_probe(struct i2c_client *client)80{81 struct device *dev = &client->dev;82 struct regulator_config config = {};83 struct regulator_dev *rdev;84 85 config.dev = dev;86 config.of_node = dev->of_node;87 config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config);88 if (IS_ERR(config.regmap)) {89 dev_err(dev, "Failed to init regmap");90 return PTR_ERR(config.regmap);91 }92 93 rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config);94 if (IS_ERR(rdev)) {95 dev_err(dev, "Failed to register regulator MAX77503");96 return PTR_ERR(rdev);97 }98 99 return 0;100}101 102static const struct of_device_id of_max77503_match_tbl[] = {103 { .compatible = "adi,max77503", },104 { }105};106 107MODULE_DEVICE_TABLE(of, of_max77503_match_tbl);108 109static const struct i2c_device_id max77503_regulator_id[] = {110 {"max77503"},111 { }112};113 114MODULE_DEVICE_TABLE(i2c, max77503_regulator_id);115 116static struct i2c_driver max77503_regulator_driver = {117 .driver = {118 .name = "max77503",119 .of_match_table = of_max77503_match_tbl120 },121 .probe = max77503_regulator_probe,122 .id_table = max77503_regulator_id,123};124 125module_i2c_driver(max77503_regulator_driver);126 127MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>");128MODULE_DESCRIPTION("MAX77503 regulator driver");129MODULE_LICENSE("GPL");130