path: root/drivers/regulator/pca9450-regulator.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2020 NXP.
 * NXP PCA9450 pmic driver
 */

#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.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/regulator/pca9450.h>

struct pc9450_dvs_config {
	unsigned int run_reg; /* dvs0 */
	unsigned int run_mask;
	unsigned int standby_reg; /* dvs1 */
	unsigned int standby_mask;
};

struct pca9450_regulator_desc {
	struct regulator_desc desc;
	const struct pc9450_dvs_config dvs;
};

struct pca9450 {
	struct device *dev;
	struct regmap *regmap;
	struct gpio_desc *sd_vsel_gpio;
	enum pca9450_chip_type type;
	unsigned int rcnt;
	int irq;
	bool sd_vsel_fixed_low;
};

static const struct regmap_range pca9450_status_range = {
	.range_min = PCA9450_REG_INT1,
	.range_max = PCA9450_REG_PWRON_STAT,
};

static const struct regmap_access_table pca9450_volatile_regs = {
	.yes_ranges = &pca9450_status_range,
	.n_yes_ranges = 1,
};

static const struct regmap_config pca9450_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_table = &pca9450_volatile_regs,
	.max_register = PCA9450_MAX_REGISTER - 1,
	.cache_type = REGCACHE_MAPLE,
};

/*
 * BUCK1/2/3
 * BUCK1RAM[1:0] BUCK1 DVS ramp rate setting
 * 00: 25mV/1usec
 * 01: 25mV/2usec
 * 10: 25mV/4usec
 * 11: 25mV/8usec
 */
static const unsigned int pca9450_dvs_buck_ramp_table[] = {
	25000, 12500, 6250, 3125
};

static const struct regulator_ops pca9450_dvs_buck_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.set_ramp_delay	= regulator_set_ramp_delay_regmap,
};

static const struct regulator_ops pca9450_buck_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
};

static const struct regulator_ops pca9450_ldo_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
};

static unsigned int pca9450_ldo5_get_reg_voltage_sel(struct regulator_dev *rdev)
{
	struct pca9450 *pca9450 = rdev_get_drvdata(rdev);

	if (pca9450->sd_vsel_fixed_low)
		return PCA9450_REG_LDO5CTRL_L;

	if (pca9450->sd_vsel_gpio && !gpiod_get_value(pca9450->sd_vsel_gpio))
		return PCA9450_REG_LDO5CTRL_L;

	return rdev->desc->vsel_reg;
}

static int pca9450_ldo5_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, pca9450_ldo5_get_reg_voltage_sel(rdev), &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
}

static int pca9450_ldo5_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned int sel)
{
	int ret;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;

	ret = regmap_update_bits(rdev->regmap, pca9450_ldo5_get_reg_voltage_sel(rdev),
				  rdev->desc->vsel_mask, sel);
	if (ret)
		return ret;

	if (rdev->desc->apply_bit)
		ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
					 rdev->desc->apply_bit,
					 rdev->desc->apply_bit);
	return ret;
}

static const struct regulator_ops pca9450_ldo5_regulator_ops = {
	.enable =