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Commit dfe7a1b0 authored by Carlo Caione's avatar Carlo Caione Committed by Mark Brown
Browse files

regulator: AXP20x: Add support for regulators subsystem 



AXP202 and AXP209 come with two synchronous step-down DC-DCs and five
LDOs. This patch introduces basic support for those regulators.

Signed-off-by: default avatarCarlo Caione <carlo@caione.org>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent c9eaa447

drivers/regulator/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -139,6 +139,13 @@ config REGULATOR_AS3722 
	  AS3722 PMIC. This will enable support for all the software

	  controllable DCDC/LDO regulators.



config REGULATOR_AXP20X

	tristate "X-POWERS AXP20X PMIC Regulators"

	depends on MFD_AXP20X

	help

	  This driver provides support for the voltage regulators on the

	  AXP20X PMIC.



config REGULATOR_BCM590XX

	tristate "Broadcom BCM590xx PMU Regulators"

	depends on MFD_BCM590XX

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o 
obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.o

obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o

obj-$(CONFIG_REGULATOR_AS3722) += as3722-regulator.o

obj-$(CONFIG_REGULATOR_AXP20X) += axp20x-regulator.o

obj-$(CONFIG_REGULATOR_BCM590XX) += bcm590xx-regulator.o

obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o

obj-$(CONFIG_REGULATOR_DA9052)	+= da9052-regulator.o

drivers/regulator/axp20x-regulator.c

0 → 100644
+285 −0
Original line number Diff line number Diff line 
/*

 * AXP20x regulators driver.

 *

 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>

 *

 * This file is subject to the terms and conditions of the GNU General

 * Public License. See the file "COPYING" in the main directory of this

 * archive for more details.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 */



#include <linux/err.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/mfd/axp20x.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/of_regulator.h>



#define AXP20X_IO_ENABLED		0x03

#define AXP20X_IO_DISABLED		0x07



#define AXP20X_WORKMODE_DCDC2_MASK	BIT(2)

#define AXP20X_WORKMODE_DCDC3_MASK	BIT(1)



#define AXP20X_FREQ_DCDC_MASK		0x0f



#define AXP20X_DESC_IO(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,   \

		       _emask, _enable_val, _disable_val)			\

	[AXP20X_##_id] = {							\

		.name		= #_id,						\

		.supply_name	= (_supply),					\

		.type		= REGULATOR_VOLTAGE,				\

		.id		= AXP20X_##_id,					\

		.n_voltages	= (((_max) - (_min)) / (_step) + 1),		\

		.owner		= THIS_MODULE,					\

		.min_uV		= (_min) * 1000,				\

		.uV_step	= (_step) * 1000,				\

		.vsel_reg	= (_vreg),					\

		.vsel_mask	= (_vmask),					\

		.enable_reg	= (_ereg),					\

		.enable_mask	= (_emask),					\

		.enable_val	= (_enable_val),				\

		.disable_val	= (_disable_val),				\

		.ops		= &axp20x_ops,					\

	}



#define AXP20X_DESC(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,	\

		    _emask) 							\

	[AXP20X_##_id] = {							\

		.name		= #_id,						\

		.supply_name	= (_supply),					\

		.type		= REGULATOR_VOLTAGE,				\

		.id		= AXP20X_##_id,					\

		.n_voltages	= (((_max) - (_min)) / (_step) + 1),		\

		.owner		= THIS_MODULE,					\

		.min_uV		= (_min) * 1000,				\

		.uV_step	= (_step) * 1000,				\

		.vsel_reg	= (_vreg),					\

		.vsel_mask	= (_vmask),					\

		.enable_reg	= (_ereg),					\

		.enable_mask	= (_emask),					\

		.ops		= &axp20x_ops,					\

	}



#define AXP20X_DESC_FIXED(_id, _supply, _volt)					\

	[AXP20X_##_id] = {							\

		.name		= #_id,						\

		.supply_name	= (_supply),					\

		.type		= REGULATOR_VOLTAGE,				\

		.id		= AXP20X_##_id,					\

		.n_voltages	= 1,						\

		.owner		= THIS_MODULE,					\

		.min_uV		= (_volt) * 1000,				\

		.ops		= &axp20x_ops_fixed				\

	}



#define AXP20X_DESC_TABLE(_id, _supply, _table, _vreg, _vmask, _ereg, _emask)	\

	[AXP20X_##_id] = {							\

		.name		= #_id,						\

		.supply_name	= (_supply),					\

		.type		= REGULATOR_VOLTAGE,				\

		.id		= AXP20X_##_id,					\

		.n_voltages	= ARRAY_SIZE(_table),				\

		.owner		= THIS_MODULE,					\

		.vsel_reg	= (_vreg),					\

		.vsel_mask	= (_vmask),					\

		.enable_reg	= (_ereg),					\

		.enable_mask	= (_emask),					\

		.volt_table	= (_table),					\

		.ops		= &axp20x_ops_table,				\

	}



static const int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000,

					1700000, 1800000, 1900000, 2000000, 2500000,

					2700000, 2800000, 3000000, 3100000, 3200000,

					3300000 };



static struct regulator_ops axp20x_ops_fixed = {

	.list_voltage		= regulator_list_voltage_linear,

};



static struct regulator_ops axp20x_ops_table = {

	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.get_voltage_sel	= regulator_get_voltage_sel_regmap,

	.list_voltage		= regulator_list_voltage_table,

	.enable			= regulator_enable_regmap,

	.disable		= regulator_disable_regmap,

	.is_enabled		= regulator_is_enabled_regmap,

};



static struct regulator_ops axp20x_ops = {

	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.get_voltage_sel	= regulator_get_voltage_sel_regmap,

	.list_voltage		= regulator_list_voltage_linear,

	.enable			= regulator_enable_regmap,

	.disable		= regulator_disable_regmap,

	.is_enabled		= regulator_is_enabled_regmap,

};



static const struct regulator_desc axp20x_regulators[] = {

	AXP20X_DESC(DCDC2, "vin2", 700, 2275, 25, AXP20X_DCDC2_V_OUT, 0x3f,

		    AXP20X_PWR_OUT_CTRL, 0x10),

	AXP20X_DESC(DCDC3, "vin3", 700, 3500, 25, AXP20X_DCDC3_V_OUT, 0x7f,

		    AXP20X_PWR_OUT_CTRL, 0x02),

	AXP20X_DESC_FIXED(LDO1, "acin", 1300),

	AXP20X_DESC(LDO2, "ldo24in", 1800, 3300, 100, AXP20X_LDO24_V_OUT, 0xf0,

		    AXP20X_PWR_OUT_CTRL, 0x04),

	AXP20X_DESC(LDO3, "ldo3in", 700, 3500, 25, AXP20X_LDO3_V_OUT, 0x7f,

		    AXP20X_PWR_OUT_CTRL, 0x40),

	AXP20X_DESC_TABLE(LDO4, "ldo24in", axp20x_ldo4_data, AXP20X_LDO24_V_OUT, 0x0f,

			  AXP20X_PWR_OUT_CTRL, 0x08),

	AXP20X_DESC_IO(LDO5, "ldo5in", 1800, 3300, 100, AXP20X_LDO5_V_OUT, 0xf0,

		       AXP20X_GPIO0_CTRL, 0x07, AXP20X_IO_ENABLED,

		       AXP20X_IO_DISABLED),

};



#define AXP_MATCH(_name, _id) \

	[AXP20X_##_id] = { \

		.name		= #_name, \

		.driver_data	= (void *) &axp20x_regulators[AXP20X_##_id], \

	}



static struct of_regulator_match axp20x_matches[] = {

	AXP_MATCH(dcdc2, DCDC2),

	AXP_MATCH(dcdc3, DCDC3),

	AXP_MATCH(ldo1, LDO1),

	AXP_MATCH(ldo2, LDO2),

	AXP_MATCH(ldo3, LDO3),

	AXP_MATCH(ldo4, LDO4),

	AXP_MATCH(ldo5, LDO5),

};



static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)

{

	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);



	if (dcdcfreq < 750) {

		dcdcfreq = 750;

		dev_warn(&pdev->dev, "DCDC frequency too low. Set to 750kHz\n");

	}



	if (dcdcfreq > 1875) {

		dcdcfreq = 1875;

		dev_warn(&pdev->dev, "DCDC frequency too high. Set to 1875kHz\n");

	}



	dcdcfreq = (dcdcfreq - 750) / 75;



	return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,

				  AXP20X_FREQ_DCDC_MASK, dcdcfreq);

}



static int axp20x_regulator_parse_dt(struct platform_device *pdev)

{

	struct device_node *np, *regulators;

	int ret;

	u32 dcdcfreq;



	np = of_node_get(pdev->dev.parent->of_node);

	if (!np)

		return 0;



	regulators = of_find_node_by_name(np, "regulators");

	if (!regulators) {

		dev_warn(&pdev->dev, "regulators node not found\n");

	} else {

		ret = of_regulator_match(&pdev->dev, regulators, axp20x_matches,

					 ARRAY_SIZE(axp20x_matches));

		if (ret < 0) {

			dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);

			return ret;

		}



		dcdcfreq = 1500;

		of_property_read_u32(regulators, "x-powers,dcdc-freq", &dcdcfreq);

		ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);

		if (ret < 0) {

			dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);

			return ret;

		}



		of_node_put(regulators);

	}



	return 0;

}



static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)

{

	unsigned int mask = AXP20X_WORKMODE_DCDC2_MASK;



	if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))

		return -EINVAL;



	if (id == AXP20X_DCDC3)

		mask = AXP20X_WORKMODE_DCDC3_MASK;



	workmode <<= ffs(mask) - 1;



	return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);

}



static int axp20x_regulator_probe(struct platform_device *pdev)

{

	struct regulator_dev *rdev;

	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);

	struct regulator_config config = { };

	struct regulator_init_data *init_data;

	int ret, i;

	u32 workmode;



	ret = axp20x_regulator_parse_dt(pdev);

	if (ret)

		return ret;



	for (i = 0; i < AXP20X_REG_ID_MAX; i++) {

		init_data = axp20x_matches[i].init_data;



		config.dev = &pdev->dev;

		config.init_data = init_data;

		config.regmap = axp20x->regmap;

		config.of_node = axp20x_matches[i].of_node;



		rdev = devm_regulator_register(&pdev->dev, &axp20x_regulators[i],

					       &config);

		if (IS_ERR(rdev)) {

			dev_err(&pdev->dev, "Failed to register %s\n",

				axp20x_regulators[i].name);



			return PTR_ERR(rdev);

		}



		ret = of_property_read_u32(axp20x_matches[i].of_node, "x-powers,dcdc-workmode",

					   &workmode);

		if (!ret) {

			if (axp20x_set_dcdc_workmode(rdev, i, workmode))

				dev_err(&pdev->dev, "Failed to set workmode on %s\n",

					axp20x_regulators[i].name);

		}

	}



	return 0;

}



static struct platform_driver axp20x_regulator_driver = {

	.probe	= axp20x_regulator_probe,

	.driver	= {

		.name		= "axp20x-regulator",

		.owner		= THIS_MODULE,

	},

};



module_platform_driver(axp20x_regulator_driver);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");

MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");