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e6ff10f24c
Add support for the Dialog Semiconductor DA9121, a single-channel dual-phase buck converter controlled via I2C. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Link: https://lore.kernel.org/r/20201103100021.19603-3-vincent.whitchurch@axis.com Signed-off-by: Mark Brown <broonie@kernel.org>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2020 Axis Communications AB */
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#include <linux/of_device.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/driver.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#define DA9121_BUCK_BUCK1_0 0x20
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#define DA9121_BUCK_BUCK1_0_CH1_EN BIT(0)
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#define DA9121_BUCK_BUCK1_5 0x25
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#define DA9121_BUCK_BUCK1_5_CH1_A_VOUT GENMASK(7, 0)
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#define DA9121_MIN_MV 300
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#define DA9121_MAX_MV 1900
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#define DA9121_STEP_MV 10
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#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
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#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
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+ 1 + DA9121_MIN_SEL)
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static const struct regmap_config da9121_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static const struct regulator_ops da9121_buck_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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static const struct regulator_desc da9121_reg = {
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.name = "da9121",
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.of_match = "buck1",
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.owner = THIS_MODULE,
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.ops = &da9121_buck_ops,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = DA9121_N_VOLTAGES,
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.min_uV = DA9121_MIN_MV * 1000,
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.uV_step = DA9121_STEP_MV * 1000,
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.linear_min_sel = DA9121_MIN_SEL,
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.vsel_reg = DA9121_BUCK_BUCK1_5,
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.vsel_mask = DA9121_BUCK_BUCK1_5_CH1_A_VOUT,
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.enable_reg = DA9121_BUCK_BUCK1_0,
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.enable_mask = DA9121_BUCK_BUCK1_0_CH1_EN,
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/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
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.ramp_delay = 20000,
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/* tBUCK_EN */
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.enable_time = 20,
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};
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static const struct of_device_id da9121_dt_ids[] = {
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{ .compatible = "dlg,da9121", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, da9121_dt_ids);
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static int da9121_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct device *dev = &i2c->dev;
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struct regulator_config config = {};
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struct regulator_dev *rdev;
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struct regmap *regmap;
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regmap = devm_regmap_init_i2c(i2c, &da9121_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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config.dev = &i2c->dev;
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config.of_node = dev->of_node;
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config.regmap = regmap;
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rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
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if (IS_ERR(rdev)) {
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dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
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return PTR_ERR(rdev);
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}
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return 0;
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}
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static const struct i2c_device_id da9121_i2c_id[] = {
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{ "da9121", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
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static struct i2c_driver da9121_regulator_driver = {
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.driver = {
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.name = "da9121",
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.of_match_table = of_match_ptr(da9121_dt_ids),
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},
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.probe = da9121_i2c_probe,
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.id_table = da9121_i2c_id,
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};
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module_i2c_driver(da9121_regulator_driver);
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MODULE_LICENSE("GPL v2");
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