Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 994aae32 authored by Keerthy's avatar Keerthy Committed by Mark Brown
Browse files

regulator: lp873x: Add support for lp873x PMIC regulators 



The regulators set consists of 2 BUCKs and 2 LDOs. The output
voltages are configurable and are meant to supply power to the
main processor and other components. The ramp delay is configurable
for both BUCKs.

Signed-off-by: default avatarKeerthy <j-keerthy@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f55532a0

drivers/regulator/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -321,6 +321,15 @@ config REGULATOR_LP872X 
	help

	  This driver supports LP8720/LP8725 PMIC



config REGULATOR_LP873X

	tristate "TI LP873X Power regulators"

	depends on MFD_LP873X && OF

	help

	  This driver supports LP873X voltage regulator chips. LP873X

	  provides two step-down converters and two general-purpose LDO

	  voltage regulators. It supports software based voltage control

	  for different voltage domains



config REGULATOR_LP8755

	tristate "TI LP8755 High Performance PMU driver"

	depends on I2C

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ obj-$(CONFIG_REGULATOR_LM363X) += lm363x-regulator.o 
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o

obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o

obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o

obj-$(CONFIG_REGULATOR_LP873X) += lp873x-regulator.o

obj-$(CONFIG_REGULATOR_LP8788) += lp8788-buck.o

obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o

obj-$(CONFIG_REGULATOR_LP8755) += lp8755.o

drivers/regulator/lp873x-regulator.c

0 → 100644
+241 −0
Original line number Diff line number Diff line 
/*

 * Regulator driver for LP873X PMIC

 *

 * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether expressed or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License version 2 for more details.

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>



#include <linux/mfd/lp873x.h>



#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \

			 _delay, _lr, _nlr, _cr)			\

	[_id] = {							\

		.desc = {						\

			.name			= _name,		\

			.id			= _id,			\

			.of_match		= of_match_ptr(_of),	\

			.regulators_node	= of_match_ptr("regulators"),\

			.ops			= &_ops,		\

			.n_voltages		= _n,			\

			.type			= REGULATOR_VOLTAGE,	\

			.owner			= THIS_MODULE,		\

			.vsel_reg		= _vr,			\

			.vsel_mask		= _vm,			\

			.enable_reg		= _er,			\

			.enable_mask		= _em,			\

			.ramp_delay		= _delay,		\

			.linear_ranges		= _lr,			\

			.n_linear_ranges	= _nlr,			\

		},							\

		.ctrl2_reg = _cr,					\

	}



struct lp873x_regulator {

	struct regulator_desc desc;

	unsigned int ctrl2_reg;

};



static const struct lp873x_regulator regulators[];



static const struct regulator_linear_range buck0_buck1_ranges[] = {

	REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),

	REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),

	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),

	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),

};



static const struct regulator_linear_range ldo0_ldo1_ranges[] = {

	REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),

};



static unsigned int lp873x_buck_ramp_delay[] = {

	30000, 15000, 10000, 7500, 3800, 1900, 940, 470

};



/* LP873X BUCK current limit */

static const unsigned int lp873x_buck_uA[] = {

	1500000, 2000000, 2500000, 3000000, 3500000, 4000000,

};



static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,

				      int ramp_delay)

{

	int id = rdev_get_id(rdev);

	struct lp873x *lp873 = rdev_get_drvdata(rdev);

	unsigned int reg;

	int ret;



	if (ramp_delay <= 470)

		reg = 7;

	else if (ramp_delay <= 940)

		reg = 6;

	else if (ramp_delay <= 1900)

		reg = 5;

	else if (ramp_delay <= 3800)

		reg = 4;

	else if (ramp_delay <= 7500)

		reg = 3;

	else if (ramp_delay <= 10000)

		reg = 2;

	else if (ramp_delay <= 15000)

		reg = 1;

	else

		reg = 0;



	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,

				 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,

				 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));

	if (ret) {

		dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);

		return ret;

	}



	rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];



	return 0;

}



static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,

					 int min_uA, int max_uA)

{

	int id = rdev_get_id(rdev);

	struct lp873x *lp873 = rdev_get_drvdata(rdev);

	int i;



	for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {

		if (lp873x_buck_uA[i] >= min_uA &&

		    lp873x_buck_uA[i] <= max_uA)

			return regmap_update_bits(lp873->regmap,

						  regulators[id].ctrl2_reg,

						  LP873X_BUCK0_CTRL_2_BUCK0_ILIM,

						  i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));

	}



	return -EINVAL;

}



static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)

{

	int id = rdev_get_id(rdev);

	struct lp873x *lp873 = rdev_get_drvdata(rdev);

	int ret;

	unsigned int val;



	ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);

	if (ret)

		return ret;



	val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>

	       __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);



	return (val < ARRAY_SIZE(lp873x_buck_uA)) ?

			lp873x_buck_uA[val] : -EINVAL;

}



/* Operations permitted on BUCK0, BUCK1 */

static struct regulator_ops lp873x_buck01_ops = {

	.is_enabled		= regulator_is_enabled_regmap,

	.enable			= regulator_enable_regmap,

	.disable		= regulator_disable_regmap,

	.get_voltage_sel	= regulator_get_voltage_sel_regmap,

	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.list_voltage		= regulator_list_voltage_linear_range,

	.map_voltage		= regulator_map_voltage_linear_range,

	.set_voltage_time_sel	= regulator_set_voltage_time_sel,

	.set_ramp_delay		= lp873x_buck_set_ramp_delay,

	.set_current_limit	= lp873x_buck_set_current_limit,

	.get_current_limit	= lp873x_buck_get_current_limit,

};



/* Operations permitted on LDO0 and LDO1 */

static struct regulator_ops lp873x_ldo01_ops = {

	.is_enabled		= regulator_is_enabled_regmap,

	.enable			= regulator_enable_regmap,

	.disable		= regulator_disable_regmap,

	.get_voltage_sel	= regulator_get_voltage_sel_regmap,

	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.list_voltage		= regulator_list_voltage_linear_range,

	.map_voltage		= regulator_map_voltage_linear_range,

};



static const struct lp873x_regulator regulators[] = {

	LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,

			 256, LP873X_REG_BUCK0_VOUT,

			 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,

			 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,

			 buck0_buck1_ranges, 4, LP873X_REG_BUCK0_CTRL_2),

	LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,

			 256, LP873X_REG_BUCK1_VOUT,

			 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,

			 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,

			 buck0_buck1_ranges, 4, LP873X_REG_BUCK1_CTRL_2),

	LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,

			 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,

			 LP873X_REG_LDO0_CTRL,

			 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 1,

			 0xFF),

	LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,

			 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,

			 LP873X_REG_LDO1_CTRL,

			 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 1,

			 0xFF),

};



static int lp873x_regulator_probe(struct platform_device *pdev)

{

	struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);

	struct regulator_config config = { };

	struct regulator_dev *rdev;

	int i;



	platform_set_drvdata(pdev, lp873);



	config.dev = &pdev->dev;

	config.dev->of_node = lp873->dev->of_node;

	config.driver_data = lp873;

	config.regmap = lp873->regmap;



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

		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,

					       &config);

		if (IS_ERR(rdev)) {

			dev_err(lp873->dev, "failed to register %s regulator\n",

				pdev->name);

			return PTR_ERR(rdev);

		}

	}



	return 0;

}



static const struct platform_device_id lp873x_regulator_id_table[] = {

	{ "lp873x-regulator", },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);



static struct platform_driver lp873x_regulator_driver = {

	.driver = {

		.name = "lp873x-pmic",

	},

	.probe = lp873x_regulator_probe,

	.id_table = lp873x_regulator_id_table,

};

module_platform_driver(lp873x_regulator_driver);



MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");

MODULE_DESCRIPTION("LP873X voltage regulator driver");

MODULE_ALIAS("platform:lp873x-pmic");

MODULE_LICENSE("GPL v2");