linux-imx

// SPDX-License-Identifier: GPL-2.0+

//

// max8997.c - Regulator driver for the Maxim 8997/8966

//

// Copyright (C) 2011 Samsung Electronics

// MyungJoo Ham <myungjoo.ham@samsung.com>

//

// This driver is based on max8998.c

​

#include <linux/bug.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/of_gpio.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/mfd/max8997.h>

#include <linux/mfd/max8997-private.h>

#include <linux/regulator/of_regulator.h>

​

struct max8997_data {

    struct device *dev;

    struct max8997_dev *iodev;

    int num_regulators;

    int ramp_delay; /* in mV/us */

​

    bool buck1_gpiodvs;

    bool buck2_gpiodvs;

    bool buck5_gpiodvs;

    u8 buck1_vol[8];

    u8 buck2_vol[8];

    u8 buck5_vol[8];

    int buck125_gpios[3];

    int buck125_gpioindex;

    bool ignore_gpiodvs_side_effect;

​

    u8 saved_states[MAX8997_REG_MAX];

};

​

static const unsigned int safeoutvolt[] = {

    4850000,

    4900000,

    4950000,

    3300000,

};

​

static inline void max8997_set_gpio(struct max8997_data *max8997)

{

    int set3 = (max8997->buck125_gpioindex) & 0x1;

    int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;

    int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;

​

    gpio_set_value(max8997->buck125_gpios[0], set1);

    gpio_set_value(max8997->buck125_gpios[1], set2);

    gpio_set_value(max8997->buck125_gpios[2], set3);

}

​

struct voltage_map_desc {

    int min;

    int max;

    int step;

};

​

/* Voltage maps in uV */

static const struct voltage_map_desc ldo_voltage_map_desc = {

    .min = 800000,  .max = 3950000, .step = 50000,

}; /* LDO1 ~ 18, 21 all */

​

static const struct voltage_map_desc buck1245_voltage_map_desc = {

    .min = 650000,  .max = 2225000, .step = 25000,

}; /* Buck1, 2, 4, 5 */

​

static const struct voltage_map_desc buck37_voltage_map_desc = {

    .min = 750000,  .max = 3900000, .step = 50000,

}; /* Buck3, 7 */

​

/* current map in uA */

static const struct voltage_map_desc charger_current_map_desc = {

    .min = 200000,  .max = 950000,  .step = 50000,

};

​

static const struct voltage_map_desc topoff_current_map_desc = {

    .min = 50000,   .max = 200000,  .step = 10000,

};

​

static const struct voltage_map_desc *reg_voltage_map[] = {

    [MAX8997_LDO1] = &ldo_voltage_map_desc,

    [MAX8997_LDO2] = &ldo_voltage_map_desc,

    [MAX8997_LDO3] = &ldo_voltage_map_desc,

    [MAX8997_LDO4] = &ldo_voltage_map_desc,