1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  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			0x00
 16#define MAX77503_REG_VOUT			0x01
 17
 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			0x1
 26#define MAX77503_AD_DISABLED		0x0
 27
 28struct max77503_dev {
 29	struct device *dev;
 30	struct device_node *of_node;
 31	struct regulator_desc desc;
 32	struct regulator_dev *rdev;
 33	struct regmap *regmap;
 34};
 35
 36static const struct regmap_config max77503_regmap_config = {
 37	.reg_bits = 8,
 38	.val_bits = 8,
 39	.max_register = 0x2,
 40};
 41
 42static const struct regulator_ops max77503_buck_ops = {
 43	.list_voltage = regulator_list_voltage_linear_range,
 44	.map_voltage = regulator_map_voltage_ascend,
 45	.is_enabled = regulator_is_enabled_regmap,
 46	.enable = regulator_enable_regmap,
 47	.disable = regulator_disable_regmap,
 48	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 49	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 50	.get_current_limit = regulator_get_current_limit_regmap,
 51	.set_current_limit = regulator_set_current_limit_regmap,
 52	.set_active_discharge = regulator_set_active_discharge_regmap,
 53	.set_soft_start = regulator_set_soft_start_regmap,
 54};
 55
 56static const struct linear_range max77503_buck_ranges[] = {
 57	REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000)
 58};
 59
 60static const unsigned int max77503_current_limit_table[] = {
 61	500000, 2000000
 62};
 63
 64static const struct regulator_desc max77503_regulators_desc = {
 65	.name = "max77503",
 66	.enable_reg = MAX77503_REG_CFG,
 67	.enable_mask = MAX77503_BIT_EN,
 68	.ops = &max77503_buck_ops,
 69	.type = REGULATOR_VOLTAGE,
 70	.linear_ranges = max77503_buck_ranges,
 71	.n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges),
 72	.vsel_reg = MAX77503_REG_VOUT,
 73	.vsel_mask = MAX77503_BITS_MX_VOUT,
 74	.soft_start_reg = MAX77503_REG_CFG,
 75	.soft_start_mask = MAX77503_BITS_SOFT_START,
 76	.active_discharge_reg = MAX77503_REG_CFG,
 77	.active_discharge_mask = MAX77503_BIT_ADEN,
 78	.active_discharge_off = MAX77503_AD_DISABLED,
 79	.active_discharge_on = MAX77503_AD_ENABLED,
 80	.csel_reg = MAX77503_REG_CFG,
 81	.csel_mask = MAX77503_BIT_CURR_LIM,
 82	.curr_table = max77503_current_limit_table,
 83	.n_current_limits = ARRAY_SIZE(max77503_current_limit_table),
 84	.owner = THIS_MODULE,
 85};
 86
 87static int max77503_regulator_probe(struct i2c_client *client)
 88{
 89	struct device *dev = &client->dev;
 90	struct regulator_config config = {};
 91	struct regulator_dev *rdev;
 92
 93	config.dev = dev;
 94	config.of_node = dev->of_node;
 95	config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config);
 96	if (IS_ERR(config.regmap)) {
 97		dev_err(dev, "Failed to init regmap");
 98		return PTR_ERR(config.regmap);
 99	}
100
101	rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config);
102	if (IS_ERR(rdev)) {
103		dev_err(dev, "Failed to register regulator MAX77503");
104		return PTR_ERR(rdev);
105	}
106
107	return 0;
108}
109
110static const struct of_device_id of_max77503_match_tbl[] = {
111	{ .compatible = "adi,max77503", },
112	{ }
113};
114
115MODULE_DEVICE_TABLE(of, of_max77503_match_tbl);
116
117static const struct i2c_device_id max77503_regulator_id[] = {
118	{"max77503"},
119	{ }
120};
121
122MODULE_DEVICE_TABLE(i2c, max77503_regulator_id);
123
124static struct i2c_driver max77503_regulator_driver = {
125	.driver = {
126		.name = "max77503",
127		.of_match_table = of_max77503_match_tbl
128	},
129	.probe = max77503_regulator_probe,
130	.id_table = max77503_regulator_id,
131};
132
133module_i2c_driver(max77503_regulator_driver);
134
135MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>");
136MODULE_DESCRIPTION("MAX77503 regulator driver");
137MODULE_LICENSE("GPL");