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Unverified Commit 8878302e authored by Ondrej Jirman's avatar Ondrej Jirman Committed by Mark Brown
Browse files

regulator: add support for SY8106A regulator 



SY8106A is an I2C attached single output regulator made by Silergy Corp,
which is used on several Allwinner H3/H5 SBCs to control the power
supply of the ARM cores.

Add a driver for it.

Signed-off-by: default avatarOndrej Jirman <megous@megous.com>
[Icenowy: Change commit message, remove enable/disable code, add default
 ramp_delay, add comment for go bit, add code for fixed mode voltage]
Signed-off-by: default avatarIcenowy Zheng <icenowy@aosc.io>
Reviewed-by: default avatarChen-Yu Tsai <wens@csie.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 32aba834

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -13461,6 +13461,12 @@ S: Supported 
F:	net/switchdev/

F:	include/net/switchdev.h



SY8106A REGULATOR DRIVER

M:	Icenowy Zheng <icenowy@aosc.io>

S:	Maintained

F:	drivers/regulator/sy8106a-regulator.c

F:	Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt



SYNC FILE FRAMEWORK

M:	Sumit Semwal <sumit.semwal@linaro.org>

R:	Gustavo Padovan <gustavo@padovan.org>

drivers/regulator/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -801,6 +801,13 @@ config REGULATOR_STW481X_VMMC 
	  This driver supports the internal VMMC regulator in the STw481x

	  PMIC chips.



config REGULATOR_SY8106A

	tristate "Silergy SY8106A regulator"

	depends on I2C && (OF || COMPILE_TEST)

	select REGMAP_I2C

	help

	  This driver supports SY8106A single output regulator.



config REGULATOR_TPS51632

	tristate "TI TPS51632 Power Regulator"

	depends on I2C

drivers/regulator/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o 
obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o

obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o

obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o

obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o

obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o

obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o

obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
@@ -125,5 +126,4 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o 
obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o

obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o





ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/sy8106a-regulator.c

0 → 100644
+167 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

//

// sy8106a-regulator.c - Regulator device driver for SY8106A

//

// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>

// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>



#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/of_regulator.h>



#define SY8106A_REG_VOUT1_SEL		0x01

#define SY8106A_REG_VOUT_COM		0x02

#define SY8106A_REG_VOUT1_SEL_MASK	0x7f

#define SY8106A_DISABLE_REG		BIT(0)

/*

 * The I2C controlled voltage will only work when this bit is set; otherwise

 * it will behave like a fixed regulator.

 */

#define SY8106A_GO_BIT			BIT(7)



struct sy8106a {

	struct regulator_dev *rdev;

	struct regmap *regmap;

	u32 fixed_voltage;

};



static const struct regmap_config sy8106a_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

};



static const struct regulator_ops sy8106a_ops = {

	.set_voltage_sel = regulator_set_voltage_sel_regmap,

	.set_voltage_time_sel = regulator_set_voltage_time_sel,

	.get_voltage_sel = regulator_get_voltage_sel_regmap,

	.list_voltage = regulator_list_voltage_linear,

	/* Enabling/disabling the regulator is not yet implemented */

};



/* Default limits measured in millivolts */

#define SY8106A_MIN_MV		680

#define SY8106A_MAX_MV		1950

#define SY8106A_STEP_MV		10



static const struct regulator_desc sy8106a_reg = {

	.name = "SY8106A",

	.id = 0,

	.ops = &sy8106a_ops,

	.type = REGULATOR_VOLTAGE,

	.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,

	.min_uV = (SY8106A_MIN_MV * 1000),

	.uV_step = (SY8106A_STEP_MV * 1000),

	.vsel_reg = SY8106A_REG_VOUT1_SEL,

	.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,

	/*

	 * This ramp_delay is a conservative default value which works on

	 * H3/H5 boards VDD-CPUX situations.

	 */

	.ramp_delay = 200,

	.owner = THIS_MODULE,

};



/*

 * I2C driver interface functions

 */

static int sy8106a_i2c_probe(struct i2c_client *i2c,

			    const struct i2c_device_id *id)

{

	struct sy8106a *chip;

	struct device *dev = &i2c->dev;

	struct regulator_dev *rdev = NULL;

	struct regulator_config config = { };

	unsigned int reg, vsel;

	int error;



	chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL);

	if (!chip)

		return -ENOMEM;



	error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",

				     &chip->fixed_voltage);

	if (error)

		return error;



	if (chip->fixed_voltage < SY8106A_MIN_MV * 1000 ||

	    chip->fixed_voltage > SY8106A_MAX_MV * 1000)

		return -EINVAL;



	chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);

	if (IS_ERR(chip->regmap)) {

		error = PTR_ERR(chip->regmap);

		dev_err(dev, "Failed to allocate register map: %d\n", error);

		return error;

	}



	config.dev = &i2c->dev;

	config.regmap = chip->regmap;

	config.driver_data = chip;



	config.of_node = dev->of_node;

	config.init_data = of_get_regulator_init_data(dev, dev->of_node,

						      &sy8106a_reg);



	if (!config.init_data)

		return -ENOMEM;



	/* Ensure GO_BIT is enabled when probing */

	error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, &reg);

	if (error)

		return error;



	if (!(reg & SY8106A_GO_BIT)) {

		vsel = (chip->fixed_voltage / 1000 - SY8106A_MIN_MV) /

		       SY8106A_STEP_MV;



		error = regmap_write(chip->regmap, SY8106A_REG_VOUT1_SEL,

				     vsel | SY8106A_GO_BIT);

		if (error)

			return error;

	}



	/* Probe regulator */

	rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);

	if (IS_ERR(rdev)) {

		error = PTR_ERR(rdev);

		dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);

		return error;

	}



	chip->rdev = rdev;



	i2c_set_clientdata(i2c, chip);



	return 0;

}



static const struct of_device_id sy8106a_i2c_of_match[] = {

	{ .compatible = "silergy,sy8106a" },

	{ },

};

MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);



static const struct i2c_device_id sy8106a_i2c_id[] = {

	{ "sy8106a", 0 },

	{ },

};

MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);



static struct i2c_driver sy8106a_regulator_driver = {

	.driver = {

		.name = "sy8106a",

		.of_match_table	= of_match_ptr(sy8106a_i2c_of_match),

	},

	.probe = sy8106a_i2c_probe,

	.id_table = sy8106a_i2c_id,

};



module_i2c_driver(sy8106a_regulator_driver);



MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");

MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");

MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");

MODULE_LICENSE("GPL");