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;
};

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,
};

/*
 * BUCK1/2/3
 * 0.60 to 2.1875V (12.5mV step)
 */
static const struct linear_range pca9450_dvs_buck_volts[] = {
	REGULATOR_LINEAR_RANGE(600000,  0x00, 0x7F, 12500),
};

/*
 * BUCK1/3
 * 0.65 to 2.2375V (12.5mV step)
 */
static const struct linear_range pca9451a_dvs_buck_volts[] = {
	REGULATOR_LINEAR_RANGE(650000, 0x00, 0x7F, 12500),
};

/*
 * BUCK4/5/6
 * 0.6V to 3.4V (25mV step)
 */
static const struct linear_range pca9450_buck_volts[] = {
	REGULATOR_LINEAR_RANGE(600000, 0x00, 0x70, 25000),
	REGULATOR_LINEAR_RANGE(3400000, 0x71, 0x7F, 0),
};

/*
 * LDO1
 * 1.6 to 3.3V ()
 */
static const struct linear_range pca9450_ldo1_volts[] = {
	REGULATOR_LINEAR_RANGE(1600000, 0x00, 0x03, 100000),
	REGULATOR_LINEAR_RANGE(3000000, 0x04, 0x07, 100000),
};

/*
 * LDO2
 * 0.8 to 1.15V (50mV step)
 */
static const struct linear_range pca9450_ldo2_volts[] = {
	REGULATOR_LINEAR_RANGE(800000, 0x00, 0x07, 50000),
};

/*
 * LDO3/4
 * 0.8 to 3.3V (100mV step)
 */
static const struct linear_range pca9450_ldo34_volts[] = {
	REGULATOR_LINEAR_RANGE(800000, 0x00, 0x19, 100000),
	REGULATOR_LINEAR_RANGE(3300000, 0x1A, 0x1F, 0),
};

/*
 * LDO5
 * 1.8 to 3.3V (100mV step)
 */
static const struct linear_range pca9450_ldo5_volts[] = {
	REGULATOR_LINEAR_RANGE(1800000,  0x00, 0x0F, 100000),
};

static int buck_set_dvs(const struct regulator_desc *desc,
			struct device_node *np, struct regmap *regmap,
			char *prop, unsigned int reg, unsigned int mask)
{
	int ret, i;
	uint32_t uv;

	ret = of_property_read_u32(np, prop, &uv);
	if (ret == -EINVAL)
		return 0;
	else if (ret)
		return ret;

	for (i = 0; i < desc->n_voltages; i++) {
		ret = regulator_desc_list_voltage_linear_range(desc, i);
		if (ret < 0)
			continue;
		if (ret == uv) {
			i <<= ffs(desc->vsel_mask) - 1;
			ret = regmap_update_bits(regmap, reg, mask, i);
			break;
		}
	}

	if (ret == 0) {
		struct pca9450_regulator_desc *regulator = containe