Unverified Commit e6ff10f2 authored by Vincent Whitchurch's avatar Vincent Whitchurch Committed by Mark Brown
Browse files

regulator: Add support for DA9121 regulator 



Add support for the Dialog Semiconductor DA9121, a single-channel
dual-phase buck converter controlled via I2C.

Signed-off-by: default avatarVincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20201103100021.19603-3-vincent.whitchurch@axis.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent d73e873b

drivers/regulator/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -303,6 +303,18 @@ config REGULATOR_DA9063 
	  This driver can also be built as a module. If so, the module

	  will be called da9063-regulator.



config REGULATOR_DA9121

	tristate "Dialog Semiconductor DA9121 regulator"

	depends on I2C && OF

	select REGMAP_I2C

	help

	  Say y here to support for the Dialog Semiconductor DA9121.  The

	  DA9210 is a dual-phase buck converter controlled through an I2C

	  interface.



	  This driver can also be built as a module. If so, the module

	  will be called da9121-regulator.



config REGULATOR_DA9210

	tristate "Dialog Semiconductor DA9210 regulator"

	depends on I2C

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o 
obj-$(CONFIG_REGULATOR_DA9055)	+= da9055-regulator.o

obj-$(CONFIG_REGULATOR_DA9062)	+= da9062-regulator.o

obj-$(CONFIG_REGULATOR_DA9063)	+= da9063-regulator.o

obj-$(CONFIG_REGULATOR_DA9121) += da9121-regulator.o

obj-$(CONFIG_REGULATOR_DA9210) += da9210-regulator.o

obj-$(CONFIG_REGULATOR_DA9211) += da9211-regulator.o

obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o

drivers/regulator/da9121-regulator.c

0 → 100644
+108 −0
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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");