Unverified Commit a747070e authored by ChiYuan Huang's avatar ChiYuan Huang Committed by Mark Brown
Browse files

regulator: rt6245: Add support for Richtek RT6245 



Richtek RT6245 is a high-performance, synchronous step-down converter
that can deliver up to 14A output current with an input supply voltage
range of 4.5V to 17V.

Signed-off-by: default avatarChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1622699844-19203-2-git-send-email-u0084500@gmail.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1623d767

drivers/regulator/Kconfig

+9 −0
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@@ -1031,6 +1031,15 @@ config REGULATOR_RT6160 
	  The wide output range is from 2025mV to 5200mV and can be used on most

	  common application scenario.



config REGULATOR_RT6245

	tristate "Richtek RT6245 voltage regulator"

	depends on I2C

	select REGMAP_I2C

	help

	  This adds supprot for Richtek RT6245 voltage regulator.

	  It can support up to 14A output current and adjustable output voltage

	  from 0.4375V to 1.3875V, per step 12.5mV.



config REGULATOR_RTMV20

	tristate "RTMV20 Laser Diode Regulator"

	depends on I2C

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -124,6 +124,7 @@ obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o 
obj-$(CONFIG_REGULATOR_RT4831)	+= rt4831-regulator.o

obj-$(CONFIG_REGULATOR_RT5033)	+= rt5033-regulator.o

obj-$(CONFIG_REGULATOR_RT6160)	+= rt6160-regulator.o

obj-$(CONFIG_REGULATOR_RT6245)	+= rt6245-regulator.o

obj-$(CONFIG_REGULATOR_RTMV20)	+= rtmv20-regulator.o

obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o

obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o

drivers/regulator/rt6245-regulator.c

0 → 100644
+254 −0
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// SPDX-License-Identifier: GPL-2.0+



#include <linux/bitops.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/of_regulator.h>



#define RT6245_VIRT_OCLIMIT	0x00

#define RT6245_VIRT_OTLEVEL	0x01

#define RT6245_VIRT_PGDLYTIME	0x02

#define RT6245_VIRT_SLEWRATE	0x03

#define RT6245_VIRT_SWFREQ	0x04

#define RT6245_VIRT_VOUT	0x05



#define RT6245_VOUT_MASK	GENMASK(6, 0)

#define RT6245_SLEW_MASK	GENMASK(2, 0)

#define RT6245_CHKSUM_MASK	BIT(7)

#define RT6245_CODE_MASK	GENMASK(6, 0)



/* HW Enable + Soft start time */

#define RT6245_ENTIME_IN_US	5000



#define RT6245_VOUT_MINUV	437500

#define RT6245_VOUT_MAXUV	1387500

#define RT6245_VOUT_STEPUV	12500

#define RT6245_NUM_VOUT		((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1)



struct rt6245_priv {

	struct gpio_desc *enable_gpio;

	bool enable_state;

};



static int rt6245_enable(struct regulator_dev *rdev)

{

	struct rt6245_priv *priv = rdev_get_drvdata(rdev);

	struct regmap *regmap = rdev_get_regmap(rdev);

	int ret;



	if (!priv->enable_gpio)

		return 0;



	gpiod_direction_output(priv->enable_gpio, 1);

	usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);



	regcache_cache_only(regmap, false);

	ret = regcache_sync(regmap);

	if (ret)

		return ret;



	priv->enable_state = true;

	return 0;

}



static int rt6245_disable(struct regulator_dev *rdev)

{

	struct rt6245_priv *priv = rdev_get_drvdata(rdev);

	struct regmap *regmap = rdev_get_regmap(rdev);



	if (!priv->enable_gpio)

		return -EINVAL;



	regcache_cache_only(regmap, true);

	regcache_mark_dirty(regmap);



	gpiod_direction_output(priv->enable_gpio, 0);



	priv->enable_state = false;

	return 0;

}



static int rt6245_is_enabled(struct regulator_dev *rdev)

{

	struct rt6245_priv *priv = rdev_get_drvdata(rdev);



	return priv->enable_state ? 1 : 0;

}



static const struct regulator_ops rt6245_regulator_ops = {

	.list_voltage = regulator_list_voltage_linear,

	.set_voltage_sel = regulator_set_voltage_sel_regmap,

	.get_voltage_sel = regulator_get_voltage_sel_regmap,

	.set_ramp_delay = regulator_set_ramp_delay_regmap,

	.enable = rt6245_enable,

	.disable = rt6245_disable,

	.is_enabled = rt6245_is_enabled,

};



/* ramp delay dividend is 12500 uV/uS, and divisor from 1 to 8 */

static const unsigned int rt6245_ramp_delay_table[] = {

	12500, 6250, 4167, 3125, 2500, 2083, 1786, 1562

};



static const struct regulator_desc rt6245_regulator_desc = {

	.name = "rt6245-regulator",

	.ops = &rt6245_regulator_ops,

	.type = REGULATOR_VOLTAGE,

	.min_uV = RT6245_VOUT_MINUV,

	.uV_step = RT6245_VOUT_STEPUV,

	.n_voltages = RT6245_NUM_VOUT,

	.ramp_delay_table = rt6245_ramp_delay_table,

	.n_ramp_values = ARRAY_SIZE(rt6245_ramp_delay_table),

	.owner = THIS_MODULE,

	.vsel_reg = RT6245_VIRT_VOUT,

	.vsel_mask = RT6245_VOUT_MASK,

	.ramp_reg = RT6245_VIRT_SLEWRATE,

	.ramp_mask = RT6245_SLEW_MASK,

};



static int rt6245_init_device_properties(struct device *dev)

{

	const struct {

		const char *name;

		unsigned int reg;

	} rt6245_props[] = {

		{ "richtek,oc-level-select",  RT6245_VIRT_OCLIMIT },

		{ "richtek,ot-level-select", RT6245_VIRT_OTLEVEL },

		{ "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME },

		{ "richtek,switch-freq-select", RT6245_VIRT_SWFREQ }

	};

	struct regmap *regmap = dev_get_regmap(dev, NULL);

	u8 propval;

	int i, ret;



	for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) {

		ret = device_property_read_u8(dev, rt6245_props[i].name, &propval);

		if (ret)

			continue;



		ret = regmap_write(regmap, rt6245_props[i].reg, propval);

		if (ret) {

			dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval);

			return ret;

		}

	}



	return 0;

}



static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val)

{

	struct i2c_client *i2c = context;

	const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 };

	unsigned int code, bit_count;



	code = func_base[reg];

	code += val;



	/* xor checksum for bit 6 to 0 */

	bit_count = hweight8(code & RT6245_CODE_MASK);

	if (bit_count % 2)

		code |= RT6245_CHKSUM_MASK;

	else

		code &= ~RT6245_CHKSUM_MASK;



	return i2c_smbus_write_byte(i2c, code);

}



static const struct reg_default rt6245_reg_defaults[] = {

	/* Default over current 14A */

	{ RT6245_VIRT_OCLIMIT, 2 },

	/* Default over temperature 150'c */

	{ RT6245_VIRT_OTLEVEL, 0 },

	/* Default power good delay time 10us */

	{ RT6245_VIRT_PGDLYTIME, 1 },

	/* Default slewrate 12.5mV/uS */

	{ RT6245_VIRT_SLEWRATE, 0 },

	/* Default switch frequency 800KHz */

	{ RT6245_VIRT_SWFREQ, 1 },

	/* Default voltage 750mV */

	{ RT6245_VIRT_VOUT, 0x19 }

};



static const struct regmap_config rt6245_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

	.max_register = RT6245_VIRT_VOUT,

	.cache_type = REGCACHE_FLAT,

	.reg_defaults = rt6245_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults),

	.reg_write = rt6245_reg_write,

};



static int rt6245_probe(struct i2c_client *i2c)

{

	struct rt6245_priv *priv;

	struct regmap *regmap;

	struct regulator_config regulator_cfg = {};

	struct regulator_dev *rdev;

	int ret;



	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	priv->enable_state = true;



	priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);

	if (IS_ERR(priv->enable_gpio)) {

		dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");

		return PTR_ERR(priv->enable_gpio);

	}



	usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);



	regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config);

	if (IS_ERR(regmap)) {

		dev_err(&i2c->dev, "Failed to initialize the regmap\n");

		return PTR_ERR(regmap);

	}



	ret = rt6245_init_device_properties(&i2c->dev);

	if (ret) {

		dev_err(&i2c->dev, "Failed to initialize device properties\n");

		return ret;

	}



	regulator_cfg.dev = &i2c->dev;

	regulator_cfg.of_node = i2c->dev.of_node;

	regulator_cfg.regmap = regmap;

	regulator_cfg.driver_data = priv;

	regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,

							     &rt6245_regulator_desc);

	rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, &regulator_cfg);

	if (IS_ERR(rdev)) {

		dev_err(&i2c->dev, "Failed to register regulator\n");

		return PTR_ERR(rdev);

	}



	return 0;

}



static const struct of_device_id __maybe_unused rt6245_of_match_table[] = {

	{ .compatible = "richtek,rt6245", },

	{}

};

MODULE_DEVICE_TABLE(of, rt6245_of_match_table);



static struct i2c_driver rt6245_driver = {

	.driver = {

		.name = "rt6245",

		.of_match_table = rt6245_of_match_table,

	},

	.probe_new = rt6245_probe,

};

module_i2c_driver(rt6245_driver);



MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");

MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver");

MODULE_LICENSE("GPL v2");