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Unverified Commit 7482d6ec authored by Boris Brezillon's avatar Boris Brezillon Committed by Mark Brown
Browse files

regulator: act8945a-regulator: Implement PM functionalities 



The regulator supports a dedicated suspend mode.
Implement the appropriate ->set_suspend_xx() hooks, add support for
->set_mode(), and provide basic PM ops functionalities to setup the
regulator in a suspend state when the system is entering suspend.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
[claudiu.beznea@microchip.com: remove shutdown function, use dev_pm_ops,
 fix checkpatch warning, adapt commit message, add LDO modes support,
 move modes constants to active-semi,8945a-regulator.h, remove rdevs from
 struct act8945a_pmic, add op_mode to act8945a_pmic]
Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 90bc8ac2

drivers/regulator/act8945a-regulator.c

+181 −5
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <dt-bindings/regulator/active-semi,8945a-regulator.h>



/**

 * ACT8945A Global Register Map.
@@ -28,20 +29,27 @@ 
#define ACT8945A_DCDC1_VSET1	0x20

#define ACT8945A_DCDC1_VSET2	0x21

#define ACT8945A_DCDC1_CTRL	0x22

#define ACT8945A_DCDC1_SUS	0x24

#define ACT8945A_DCDC2_VSET1	0x30

#define ACT8945A_DCDC2_VSET2	0x31

#define ACT8945A_DCDC2_CTRL	0x32

#define ACT8945A_DCDC2_SUS	0x34

#define ACT8945A_DCDC3_VSET1	0x40

#define ACT8945A_DCDC3_VSET2	0x41

#define ACT8945A_DCDC3_CTRL	0x42

#define ACT8945A_DCDC3_SUS	0x44

#define ACT8945A_LDO1_VSET	0x50

#define ACT8945A_LDO1_CTRL	0x51

#define ACT8945A_LDO1_SUS	0x52

#define ACT8945A_LDO2_VSET	0x54

#define ACT8945A_LDO2_CTRL	0x55

#define ACT8945A_LDO2_SUS	0x56

#define ACT8945A_LDO3_VSET	0x60

#define ACT8945A_LDO3_CTRL	0x61

#define ACT8945A_LDO3_SUS	0x62

#define ACT8945A_LDO4_VSET	0x64

#define ACT8945A_LDO4_CTRL	0x65

#define ACT8945A_LDO4_SUS	0x66



/**

 * Field Definitions.
@@ -62,7 +70,12 @@ enum { 
	ACT8945A_ID_LDO2,

	ACT8945A_ID_LDO3,

	ACT8945A_ID_LDO4,

	ACT8945A_REG_NUM,

	ACT8945A_ID_MAX,

};



struct act8945a_pmic {

	struct regmap *regmap;

	u32 op_mode[ACT8945A_ID_MAX];

};



static const struct regulator_linear_range act8945a_voltage_ranges[] = {
@@ -71,6 +84,143 @@ static const struct regulator_linear_range act8945a_voltage_ranges[] = { 
	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),

};



static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)

{

	struct regmap *regmap = rdev->regmap;

	int id = rdev->desc->id, reg, val;



	switch (id) {

	case ACT8945A_ID_DCDC1:

		reg = ACT8945A_DCDC1_SUS;

		val = 0xa8;

		break;

	case ACT8945A_ID_DCDC2:

		reg = ACT8945A_DCDC2_SUS;

		val = 0xa8;

		break;

	case ACT8945A_ID_DCDC3:

		reg = ACT8945A_DCDC3_SUS;

		val = 0xa8;

		break;

	case ACT8945A_ID_LDO1:

		reg = ACT8945A_LDO1_SUS;

		val = 0xe8;

		break;

	case ACT8945A_ID_LDO2:

		reg = ACT8945A_LDO2_SUS;

		val = 0xe8;

		break;

	case ACT8945A_ID_LDO3:

		reg = ACT8945A_LDO3_SUS;

		val = 0xe8;

		break;

	case ACT8945A_ID_LDO4:

		reg = ACT8945A_LDO4_SUS;

		val = 0xe8;

		break;

	default:

		return -EINVAL;

	}



	if (enable)

		val |= BIT(4);



	/*

	 * Ask the PMIC to enable/disable this output when entering hibernate

	 * mode.

	 */

	return regmap_write(regmap, reg, val);

}



static int act8945a_set_suspend_enable(struct regulator_dev *rdev)

{

	return act8945a_set_suspend_state(rdev, true);

}



static int act8945a_set_suspend_disable(struct regulator_dev *rdev)

{

	return act8945a_set_suspend_state(rdev, false);

}



static unsigned int act8945a_of_map_mode(unsigned int mode)

{

	switch (mode) {

	case ACT8945A_REGULATOR_MODE_FIXED:

	case ACT8945A_REGULATOR_MODE_NORMAL:

		return REGULATOR_MODE_NORMAL;

	case ACT8945A_REGULATOR_MODE_LOWPOWER:

		return REGULATOR_MODE_STANDBY;

	default:

		return REGULATOR_MODE_INVALID;

	}

}



static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)

{

	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);

	struct regmap *regmap = rdev->regmap;

	int id = rdev->desc->id;

	int reg, ret, val = 0;



	switch (id) {

	case ACT8945A_ID_DCDC1:

		reg = ACT8945A_DCDC1_CTRL;

		break;

	case ACT8945A_ID_DCDC2:

		reg = ACT8945A_DCDC2_CTRL;

		break;

	case ACT8945A_ID_DCDC3:

		reg = ACT8945A_DCDC3_CTRL;

		break;

	case ACT8945A_ID_LDO1:

		reg = ACT8945A_LDO1_SUS;

		break;

	case ACT8945A_ID_LDO2:

		reg = ACT8945A_LDO2_SUS;

		break;

	case ACT8945A_ID_LDO3:

		reg = ACT8945A_LDO3_SUS;

		break;

	case ACT8945A_ID_LDO4:

		reg = ACT8945A_LDO4_SUS;

		break;

	default:

		return -EINVAL;

	}



	switch (mode) {

	case REGULATOR_MODE_STANDBY:

		if (rdev->desc->id > ACT8945A_ID_DCDC3)

			val = BIT(5);

		break;

	case REGULATOR_MODE_NORMAL:

		if (rdev->desc->id <= ACT8945A_ID_DCDC3)

			val = BIT(5);

		break;

	default:

		return -EINVAL;

	}



	ret = regmap_update_bits(regmap, reg, BIT(5), val);

	if (ret)

		return ret;



	act8945a->op_mode[id] = mode;



	return 0;

}



static unsigned int act8945a_get_mode(struct regulator_dev *rdev)

{

	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);

	int id = rdev->desc->id;



	if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)

		return -EINVAL;



	return act8945a->op_mode[id];

}



static const struct regulator_ops act8945a_ops = {

	.list_voltage		= regulator_list_voltage_linear_range,

	.map_voltage		= regulator_map_voltage_linear_range,
@@ -78,7 +228,11 @@ static const struct regulator_ops act8945a_ops = { 
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.enable			= regulator_enable_regmap,

	.disable		= regulator_disable_regmap,

	.set_mode		= act8945a_set_mode,

	.get_mode		= act8945a_get_mode,

	.is_enabled		= regulator_is_enabled_regmap,

	.set_suspend_enable	= act8945a_set_suspend_enable,

	.set_suspend_disable	= act8945a_set_suspend_disable,

};



#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)		\
@@ -86,6 +240,7 @@ static const struct regulator_ops act8945a_ops = { 
		.name			= _name,			\

		.supply_name		= _supply,			\

		.of_match		= of_match_ptr("REG_"#_id),	\

		.of_map_mode		= act8945a_of_map_mode,		\

		.regulators_node	= of_match_ptr("regulators"),	\

		.id			= _family##_ID_##_id,		\

		.type			= REGULATOR_VOLTAGE,		\
@@ -124,13 +279,17 @@ static int act8945a_pmic_probe(struct platform_device *pdev) 
{

	struct regulator_config config = { };

	const struct regulator_desc *regulators;

	struct act8945a_pmic *act8945a;

	struct regulator_dev *rdev;

	struct regmap *regmap;

	int i, num_regulators;

	bool voltage_select;



	regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!regmap) {

	act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);

	if (!act8945a)

		return -ENOMEM;



	act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!act8945a->regmap) {

		dev_err(&pdev->dev,

			"could not retrieve regmap from parent device\n");

		return -EINVAL;
@@ -149,6 +308,7 @@ static int act8945a_pmic_probe(struct platform_device *pdev) 


	config.dev = &pdev->dev;

	config.dev->of_node = pdev->dev.parent->of_node;

	config.driver_data = act8945a;

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

		rdev = devm_regulator_register(&pdev->dev, &regulators[i], &config);

		if (IS_ERR(rdev)) {
@@ -159,13 +319,29 @@ static int act8945a_pmic_probe(struct platform_device *pdev) 
		}

	}



	platform_set_drvdata(pdev, act8945a);



	/* Unlock expert registers. */

	return regmap_write(regmap, ACT8945A_SYS_UNLK_REGS, 0xef);

	return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);

}



static int act8945a_suspend(struct device *pdev)

{

	struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);



	/*

	 * Ask the PMIC to enter the suspend mode on the next PWRHLD

	 * transition.

	 */

	return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);

}



SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);



static struct platform_driver act8945a_pmic_driver = {

	.driver = {

		.name = "act8945a-regulator",

		.pm = &act8945a_pm,

	},

	.probe = act8945a_pmic_probe,

};

include/dt-bindings/regulator/active-semi,8945a-regulator.h

0 → 100644
+30 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (c) 2018 Microchip Technology, Inc. All rights reserved.

 *

 * Device Tree binding constants for the ACT8945A PMIC regulators

 */



#ifndef _DT_BINDINGS_REGULATOR_ACT8945A_H

#define _DT_BINDINGS_REGULATOR_ACT8945A_H



/*

 * These constants should be used to specify regulator modes in device tree for

 * ACT8945A regulators as follows:

 * ACT8945A_REGULATOR_MODE_FIXED:	It is specific to DCDC regulators and it

 *					specifies the usage of fixed-frequency

 *					PWM.

 *

 * ACT8945A_REGULATOR_MODE_NORMAL:	It is specific to LDO regulators and it

 *					specifies the usage of normal mode.

 *

 * ACT8945A_REGULATOR_MODE_LOWPOWER:	For DCDC and LDO regulators; it specify

 *					the usage of proprietary power-saving

 *					mode.

 */



#define ACT8945A_REGULATOR_MODE_FIXED		1

#define ACT8945A_REGULATOR_MODE_NORMAL		2

#define ACT8945A_REGULATOR_MODE_LOWPOWER	3



#endif