path: root/drivers/regulator/bd718x7-regulator.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 ROHM Semiconductors
// bd71837-regulator.c ROHM BD71837MWV/BD71847MWV regulator driver

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/rohm-bd718x7.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>

/*
 * BUCK1/2/3/4
 * BUCK1RAMPRATE[1:0] BUCK1 DVS ramp rate setting
 * 00: 10.00mV/usec 10mV 1uS
 * 01: 5.00mV/usec	10mV 2uS
 * 10: 2.50mV/usec	10mV 4uS
 * 11: 1.25mV/usec	10mV 8uS
 */
static int bd718xx_buck1234_set_ramp_delay(struct regulator_dev *rdev,
					   int ramp_delay)
{
	int id = rdev_get_id(rdev);
	unsigned int ramp_value;

	dev_dbg(&rdev->dev, "Buck[%d] Set Ramp = %d\n", id + 1,
		ramp_delay);
	switch (ramp_delay) {
	case 1 ... 1250:
		ramp_value = BUCK_RAMPRATE_1P25MV;
		break;
	case 1251 ... 2500:
		ramp_value = BUCK_RAMPRATE_2P50MV;
		break;
	case 2501 ... 5000:
		ramp_value = BUCK_RAMPRATE_5P00MV;
		break;
	case 5001 ... 10000:
		ramp_value = BUCK_RAMPRATE_10P00MV;
		break;
	default:
		ramp_value = BUCK_RAMPRATE_10P00MV;
		dev_err(&rdev->dev,
			"%s: ramp_delay: %d not supported, setting 10000mV//us\n",
			rdev->desc->name, ramp_delay);
	}

	return regmap_update_bits(rdev->regmap, BD718XX_REG_BUCK1_CTRL + id,
				  BUCK_RAMPRATE_MASK, ramp_value << 6);
}

/* Bucks 1 to 4 support DVS. PWM mode is used when voltage is changed.
 * Bucks 5 to 8 and LDOs can use PFM and must be disabled when voltage
 * is changed. Hence we return -EBUSY for these if voltage is changed
 * when BUCK/LDO is enabled.
 */
static int bd718xx_set_voltage_sel_restricted(struct regulator_dev *rdev,
						    unsigned int sel)
{
	if (regulator_is_enabled_regmap(rdev))
		return -EBUSY;

	return regulator_set_voltage_sel_regmap(rdev, sel);
}

static int bd718xx_set_voltage_sel_pickable_restricted(
		struct regulator_dev *rdev, unsigned int sel)
{
	if (regulator_is_enabled_regmap(rdev))
		return -EBUSY;

	return regulator_set_voltage_sel_pickable_regmap(rdev, sel);
}

static const struct regulator_ops bd718xx_pickable_range_ldo_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_pickable_linear_range,
	.set_voltage_sel = bd718xx_set_voltage_sel_pickable_restricted,
	.get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
};

static const struct regulator_ops bd718xx_pickable_range_buck_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_pickable_linear_range,
	.set_voltage_sel = bd718xx_set_voltage_sel_pickable_restricted,
	.get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
};

static const struct regulator_ops bd718xx_ldo_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage