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Unverified Commit 919261c0 authored by Andrei.Stefanescu@microchip.com's avatar Andrei.Stefanescu@microchip.com Committed by Mark Brown
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regulator: mcp16502: add regulator driver for MCP16502 



This patch adds a regulator driver for the MCP16502 PMIC.
This drivers supports basic operations through the
regulator interface such as:
- setting/reading voltage
- setting/reading operating mode
- reading current status

Signed-off-by: default avatarAndrei Stefanescu <andrei.stefanescu@microchip.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fef9f28a

drivers/regulator/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -567,6 +567,15 @@ config REGULATOR_MC13892 
	  Say y here to support the regulators found on the Freescale MC13892

	  PMIC.



config REGULATOR_MCP16502

	tristate "Microchip MCP16502 PMIC"

	depends on I2C && OF

	help

	  Say y here to support the MCP16502 PMIC. This driver supports

	  basic operations (get/set voltage, get/set operating mode)

	  through the regulator interface. In addition it enables

	  suspend-to-ram/standby transition.



config REGULATOR_MT6311

	tristate "MediaTek MT6311 PMIC"

	depends on I2C

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ obj-$(CONFIG_REGULATOR_MAX77802) += max77802-regulator.o 
obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o

obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o

obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o

obj-$(CONFIG_REGULATOR_MCP16502) += mcp16502.o

obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o

obj-$(CONFIG_REGULATOR_MT6323)	+= mt6323-regulator.o

obj-$(CONFIG_REGULATOR_MT6380)	+= mt6380-regulator.o

drivers/regulator/mcp16502.c

0 → 100644
+520 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

//

// MCP16502 PMIC driver

//

// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries

//

// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>

//

// Inspired from tps65086-regulator.c



#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/suspend.h>



#define VDD_LOW_SEL 0x0D

#define VDD_HIGH_SEL 0x3F



#define MCP16502_FLT BIT(7)

#define MCP16502_ENS BIT(0)



/*

 * The PMIC has four sets of registers corresponding to four power modes:

 * Performance, Active, Low-power, Hibernate.

 *

 * Registers:

 * Each regulator has a register for each power mode. To access a register

 * for a specific regulator and mode BASE_* and OFFSET_* need to be added.

 *

 * Operating modes:

 * In order for the PMIC to transition to operating modes it has to be

 * controlled via GPIO lines called LPM and HPM.

 *

 * The registers are fully configurable such that you can put all regulators in

 * a low-power state while the PMIC is in Active mode. They are supposed to be

 * configured at startup and then simply transition to/from a global low-power

 * state by setting the GPIO lpm pin high/low.

 *

 * This driver keeps the PMIC in Active mode, Low-power state is set for the

 * regulators by enabling/disabling operating mode (FPWM or Auto PFM).

 *

 * The PMIC's Low-power and Hibernate modes are used during standby/suspend.

 * To enter standby/suspend the PMIC will go to Low-power mode. From there, it

 * will transition to Hibernate when the PWRHLD line is set to low by the MPU.

 */



/*

 * This function is useful for iterating over all regulators and accessing their

 * registers in a generic way or accessing a regulator device by its id.

 */

#define MCP16502_BASE(i) (((i) + 1) << 4)

#define MCP16502_STAT_BASE(i) ((i) + 5)



#define MCP16502_OFFSET_MODE_A 0

#define MCP16502_OFFSET_MODE_LPM 1

#define MCP16502_OFFSET_MODE_HIB 2



#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL

#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE

#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY



#define MCP16502_MODE_AUTO_PFM 0

#define MCP16502_MODE_FPWM BIT(6)



#define MCP16502_VSEL 0x3F

#define MCP16502_EN BIT(7)

#define MCP16502_MODE BIT(6)



#define MCP16502_MIN_REG 0x0

#define MCP16502_MAX_REG 0x65



static unsigned int mcp16502_of_map_mode(unsigned int mode)

{

	if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)

		return mode;



	return REGULATOR_MODE_INVALID;

}



#define MCP16502_REGULATOR(_name, _id, _ranges, _ops)			\

	[_id] = {							\

		.name			= _name,			\

		.regulators_node	= of_match_ptr("regulators"),	\

		.id			= _id,				\

		.ops			= &(_ops),			\

		.type			= REGULATOR_VOLTAGE,		\

		.owner			= THIS_MODULE,			\

		.linear_ranges		= _ranges,			\

		.n_linear_ranges	= ARRAY_SIZE(_ranges),		\

		.of_match		= of_match_ptr(_name),		\

		.of_map_mode		= mcp16502_of_map_mode,		\

		.vsel_reg		= (((_id) + 1) << 4),		\

		.vsel_mask		= MCP16502_VSEL,		\

		.enable_reg		= (((_id) + 1) << 4),		\

		.enable_mask		= MCP16502_EN,			\

	}



enum {

	BUCK1 = 0,

	BUCK2,

	BUCK3,

	BUCK4,

	LDO1,

	LDO2,

	NUM_REGULATORS

};



/*

 * struct mcp16502 - PMIC representation

 * @rdev: the regulators belonging to this chip

 * @rmap: regmap to be used for I2C communication

 * @lpm: LPM GPIO descriptor

 */

struct mcp16502 {

	struct regulator_dev *rdev[NUM_REGULATORS];

	struct regmap *rmap;

	struct gpio_desc *lpm;

};



/*

 * mcp16502_gpio_set_mode() - set the GPIO corresponding value

 *

 * Used to prepare transitioning into hibernate or resuming from it.

 */

static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)

{

	switch (mode) {

	case MCP16502_OPMODE_ACTIVE:

		gpiod_set_value(mcp->lpm, 0);

		break;

	case MCP16502_OPMODE_LPM:

	case MCP16502_OPMODE_HIB:

		gpiod_set_value(mcp->lpm, 1);

		break;

	default:

		pr_err("%s: %d invalid\n", __func__, mode);

	}

}



/*

 * mcp16502_get_reg() - get the PMIC's configuration register for opmode

 *

 * @rdev: the regulator whose register we are searching

 * @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate

 */

static int mcp16502_get_reg(struct regulator_dev *rdev, int opmode)

{

	int reg = MCP16502_BASE(rdev_get_id(rdev));



	switch (opmode) {

	case MCP16502_OPMODE_ACTIVE:

		return reg + MCP16502_OFFSET_MODE_A;

	case MCP16502_OPMODE_LPM:

		return reg + MCP16502_OFFSET_MODE_LPM;

	case MCP16502_OPMODE_HIB:

		return reg + MCP16502_OFFSET_MODE_HIB;

	default:

		return -EINVAL;

	}

}



/*

 * mcp16502_get_mode() - return the current operating mode of a regulator

 *

 * Note: all functions that are not part of entering/exiting standby/suspend

 *	 use the Active mode registers.

 *

 * Note: this is different from the PMIC's operatig mode, it is the

 *	 MODE bit from the regulator's register.

 */

static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)

{

	unsigned int val;

	int ret, reg;

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);



	reg = mcp16502_get_reg(rdev, MCP16502_OPMODE_ACTIVE);

	if (reg < 0)

		return reg;



	ret = regmap_read(mcp->rmap, reg, &val);

	if (ret)

		return ret;



	switch (val & MCP16502_MODE) {

	case MCP16502_MODE_FPWM:

		return REGULATOR_MODE_NORMAL;

	case MCP16502_MODE_AUTO_PFM:

		return REGULATOR_MODE_IDLE;

	default:

		return REGULATOR_MODE_INVALID;

	}

}



/*

 * _mcp16502_set_mode() - helper for set_mode and set_suspend_mode

 *

 * @rdev: the regulator for which we are setting the mode

 * @mode: the regulator's mode (the one from MODE bit)

 * @opmode: the PMIC's operating mode: Active/Low-power/Hibernate

 */

static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,

			      unsigned int op_mode)

{

	int val;

	int reg;

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);



	reg = mcp16502_get_reg(rdev, op_mode);

	if (reg < 0)

		return reg;



	switch (mode) {

	case REGULATOR_MODE_NORMAL:

		val = MCP16502_MODE_FPWM;

		break;

	case REGULATOR_MODE_IDLE:

		val = MCP16502_MODE_AUTO_PFM;

		break;

	default:

		return -EINVAL;

	}



	reg = regmap_update_bits(mcp->rmap, reg, MCP16502_MODE, val);

	return reg;

}



/*

 * mcp16502_set_mode() - regulator_ops set_mode

 */

static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)

{

	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);

}



/*

 * mcp16502_get_status() - regulator_ops get_status

 */

static int mcp16502_get_status(struct regulator_dev *rdev)

{

	int ret;

	unsigned int val;

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);



	ret = regmap_read(mcp->rmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),

			  &val);

	if (ret)

		return ret;



	if (val & MCP16502_FLT)

		return REGULATOR_STATUS_ERROR;

	else if (val & MCP16502_ENS)

		return REGULATOR_STATUS_ON;

	else if (!(val & MCP16502_ENS))

		return REGULATOR_STATUS_OFF;



	return REGULATOR_STATUS_UNDEFINED;

}



#ifdef CONFIG_SUSPEND

/*

 * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC

 *				       mode

 */

static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)

{

	switch (pm_suspend_target_state) {

	case PM_SUSPEND_STANDBY:

		return mcp16502_get_reg(rdev, MCP16502_OPMODE_LPM);

	case PM_SUSPEND_ON:

	case PM_SUSPEND_MEM:

		return mcp16502_get_reg(rdev, MCP16502_OPMODE_HIB);

	default:

		dev_err(&rdev->dev, "invalid suspend target: %d\n",

			pm_suspend_target_state);

	}



	return -EINVAL;

}



/*

 * mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage

 */

static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)

{

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	int sel = regulator_map_voltage_linear_range(rdev, uV, uV);

	int reg = mcp16502_suspend_get_target_reg(rdev);



	if (sel < 0)

		return sel;



	if (reg < 0)

		return reg;



	return regmap_update_bits(mcp->rmap, reg, MCP16502_VSEL, sel);

}



/*

 * mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode

 */

static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,

				     unsigned int mode)

{

	switch (pm_suspend_target_state) {

	case PM_SUSPEND_STANDBY:

		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);

	case PM_SUSPEND_ON:

	case PM_SUSPEND_MEM:

		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);

	default:

		dev_err(&rdev->dev, "invalid suspend target: %d\n",

			pm_suspend_target_state);

	}



	return -EINVAL;

}



/*

 * mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable

 */

static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)

{

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	int reg = mcp16502_suspend_get_target_reg(rdev);



	if (reg < 0)

		return reg;



	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, MCP16502_EN);

}



/*

 * mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable

 */

static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)

{

	struct mcp16502 *mcp = rdev_get_drvdata(rdev);

	int reg = mcp16502_suspend_get_target_reg(rdev);



	if (reg < 0)

		return reg;



	return regmap_update_bits(mcp->rmap, reg, MCP16502_EN, 0);

}

#endif /* CONFIG_SUSPEND */



static const struct regulator_ops mcp16502_buck_ops = {

	.list_voltage			= regulator_list_voltage_linear_range,

	.map_voltage			= regulator_map_voltage_linear_range,

	.get_voltage_sel		= regulator_get_voltage_sel_regmap,

	.set_voltage_sel		= regulator_set_voltage_sel_regmap,

	.enable				= regulator_enable_regmap,

	.disable			= regulator_disable_regmap,

	.is_enabled			= regulator_is_enabled_regmap,

	.get_status			= mcp16502_get_status,



	.set_mode			= mcp16502_set_mode,

	.get_mode			= mcp16502_get_mode,



#ifdef CONFIG_SUSPEND

	.set_suspend_voltage		= mcp16502_set_suspend_voltage,

	.set_suspend_mode		= mcp16502_set_suspend_mode,

	.set_suspend_enable		= mcp16502_set_suspend_enable,

	.set_suspend_disable		= mcp16502_set_suspend_disable,

#endif /* CONFIG_SUSPEND */

};



/*

 * LDOs cannot change operating modes.

 */

static const struct regulator_ops mcp16502_ldo_ops = {

	.list_voltage			= regulator_list_voltage_linear_range,

	.map_voltage			= regulator_map_voltage_linear_range,

	.get_voltage_sel		= regulator_get_voltage_sel_regmap,

	.set_voltage_sel		= regulator_set_voltage_sel_regmap,

	.enable				= regulator_enable_regmap,

	.disable			= regulator_disable_regmap,

	.is_enabled			= regulator_is_enabled_regmap,

	.get_status			= mcp16502_get_status,



#ifdef CONFIG_SUSPEND

	.set_suspend_voltage		= mcp16502_set_suspend_voltage,

	.set_suspend_enable		= mcp16502_set_suspend_enable,

	.set_suspend_disable		= mcp16502_set_suspend_disable,

#endif /* CONFIG_SUSPEND */

};



static const struct of_device_id mcp16502_ids[] = {

	{ .compatible = "microchip,mcp16502", },

	{}

};

MODULE_DEVICE_TABLE(of, mcp16502_ids);



static const struct regulator_linear_range b1l12_ranges[] = {

	REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),

};



static const struct regulator_linear_range b234_ranges[] = {

	REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),

};



static const struct regulator_desc mcp16502_desc[] = {

	/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */

	MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops),

	MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops),

	MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops),

	MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops),

	MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops),

	MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops)

};



static const struct regmap_range mcp16502_ranges[] = {

	regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)

};



static const struct regmap_access_table mcp16502_yes_reg_table = {

	.yes_ranges = mcp16502_ranges,

	.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),

};



static const struct regmap_config mcp16502_regmap_config = {

	.reg_bits	= 8,

	.val_bits	= 8,

	.max_register	= MCP16502_MAX_REG,

	.cache_type	= REGCACHE_NONE,

	.rd_table	= &mcp16502_yes_reg_table,

	.wr_table	= &mcp16502_yes_reg_table,

};



/*

 * set_up_regulators() - initialize all regulators

 */

static int setup_regulators(struct mcp16502 *mcp, struct device *dev,

			    struct regulator_config config)

{

	int i;



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

		mcp->rdev[i] = devm_regulator_register(dev,

						       &mcp16502_desc[i],

						       &config);

		if (IS_ERR(mcp->rdev[i])) {

			dev_err(dev,

				"failed to register %s regulator %ld\n",

				mcp16502_desc[i].name, PTR_ERR(mcp->rdev[i]));

			return PTR_ERR(mcp->rdev[i]);

		}

	}



	return 0;

}



static int mcp16502_probe(struct i2c_client *client,

			  const struct i2c_device_id *id)

{

	struct regulator_config config = { };

	struct device *dev;

	struct mcp16502 *mcp;

	int ret = 0;



	dev = &client->dev;

	config.dev = dev;



	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);

	if (!mcp)

		return -ENOMEM;



	mcp->rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);

	if (IS_ERR(mcp->rmap)) {

		ret = PTR_ERR(mcp->rmap);

		dev_err(dev, "regmap init failed: %d\n", ret);

		return ret;

	}



	i2c_set_clientdata(client, mcp);

	config.regmap = mcp->rmap;

	config.driver_data = mcp;



	mcp->lpm = devm_gpiod_get(dev, "lpm", GPIOD_OUT_LOW);

	if (IS_ERR(mcp->lpm)) {

		dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));

		return PTR_ERR(mcp->lpm);

	}



	ret = setup_regulators(mcp, dev, config);

	if (ret != 0)

		return ret;



	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);



	return 0;

}



static const struct i2c_device_id mcp16502_i2c_id[] = {

	{ "mcp16502", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);



static struct i2c_driver mcp16502_drv = {

	.probe		= mcp16502_probe,

	.driver		= {

		.name	= "mcp16502-regulator",

		.of_match_table	= of_match_ptr(mcp16502_ids),

	},

	.id_table	= mcp16502_i2c_id,

};



module_i2c_driver(mcp16502_drv);



MODULE_VERSION("1.0");

MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("MCP16502 PMIC driver");

MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");