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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2020 Axis Communications AB */
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/i2c.h>
#define DA9121_BUCK_BUCK1_0 0x20
#define DA9121_BUCK_BUCK1_0_CH1_EN BIT(0)
#define DA9121_BUCK_BUCK1_5 0x25
#define DA9121_BUCK_BUCK1_5_CH1_A_VOUT GENMASK(7, 0)
#define DA9121_MIN_MV 300
#define DA9121_MAX_MV 1900
#define DA9121_STEP_MV 10
#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
+ 1 + DA9121_MIN_SEL)
static const struct regmap_config da9121_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
};
static const struct regulator_desc da9121_reg = {
.name = "da9121",
.of_match = "buck1",
.owner = THIS_MODULE,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.vsel_reg = DA9121_BUCK_BUCK1_5,
.vsel_mask = DA9121_BUCK_BUCK1_5_CH1_A_VOUT,
.enable_reg = DA9121_BUCK_BUCK1_0,
.enable_mask = DA9121_BUCK_BUCK1_0_CH1_EN,
/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
.ramp_delay = 20000,
/* tBUCK_EN */
.enable_time = 20,
};
static const struct of_device_id da9121_dt_ids[] = {
{ .compatible = "dlg,da9121", },
{ }
};
MODULE_DEVICE_TABLE(of, da9121_dt_ids);
static int da9121_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct device *dev = &i2c->dev;
struct regulator_config config = {};
struct regulator_dev *rdev;
struct regmap *regmap;
regmap = devm_regmap_init_i2c(i2c, &da9121_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
config.dev = &i2c->dev;
config.of_node = dev->of_node;
config.regmap = regmap;
rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
return PTR_ERR(rdev);
}
return 0;
}
static const struct i2c_device_id da9121_i2c_id[] = {
{ "da9121", 0 },
{},
};
MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
static struct i2c_driver da9121_regulator_driver = {
.driver = {
.name = "da9121",
.of_match_table = of_match_ptr(da9121_dt_ids),
},
.probe = da9121_i2c_probe,
.id_table = da9121_i2c_id,
};
module_i2c_driver(da9121_regulator_driver);
MODULE_LICENSE("GPL v2");
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