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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
* Keerthy <j-keerthy@ti.com>
*/
#include <common.h>
#include <fdtdec.h>
#include <errno.h>
#include <dm.h>
#include <i2c.h>
#include <log.h>
#include <asm/gpio.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include "regulator_common.h"
#define GPIO_REGULATOR_MAX_STATES 2
struct gpio_regulator_plat {
struct regulator_common_plat common;
struct gpio_desc gpio; /* GPIO for regulator voltage control */
int states[GPIO_REGULATOR_MAX_STATES];
int voltages[GPIO_REGULATOR_MAX_STATES];
};
static int gpio_regulator_of_to_plat(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct gpio_regulator_plat *dev_pdata;
struct gpio_desc *gpio;
int ret, count, i, j;
u32 states_array[GPIO_REGULATOR_MAX_STATES * 2];
dev_pdata = dev_get_plat(dev);
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata)
return -ENXIO;
/* Set type to gpio */
uc_pdata->type = REGULATOR_TYPE_GPIO;
/*
* Get gpio regulator gpio desc
* Assuming one GPIO per regulator.
* Can be extended later to multiple GPIOs
* per gpio-regulator. As of now no instance with multiple
* gpios is presnt
*/
gpio = &dev_pdata->gpio;
ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
if (ret)
debug("regulator gpio - not found! Error: %d", ret);
ret = dev_read_size(dev, "states");
if (ret < 0)
return ret;
count = ret / sizeof(states_array[0]);
if (count > ARRAY_SIZE(states_array)) {
debug("regulator gpio - to many states (%d > %d)",
count / 2, GPIO_REGULATOR_MAX_STATES);
count = ARRAY_SIZE(states_array);
}
ret = dev_read_u32_array(dev, "states", states_array, count);
if (ret < 0)
return ret;
for (i = 0, j = 0; i < count; i += 2) {
dev_pdata->voltages[j] = states_array[i];
dev_pdata->states[j] = states_array[i + 1];
j++;
}
return regulator_common_of_to_plat(dev, &dev_pdata->common, "enable-gpios");
}
static int gpio_regulator_get_value(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
int enable;
if (!dev_pdata->gpio.dev)
return -ENOSYS;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uV > uc_pdata->max_uV) {
debug("Invalid constraints for: %s\n", uc_pdata->name);
return -EINVAL;
}
enable = dm_gpio_get_value(&dev_pdata->gpio);
if (enable == dev_pdata->states[0])
return dev_pdata->voltages[0];
else
return dev_pdata->voltages[1];
}
static int gpio_regulator_set_value(struct udevice *dev, int uV)
{
struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
int ret;
bool enable;
if (!dev_pdata->gpio.dev)
return -ENOSYS;
if (uV == dev_pdata->voltages[0])
enable = dev_pdata->states[0];
else if (uV == dev_pdata->voltages[1])
enable = dev_pdata->states[1];
else
return -EINVAL;
ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
if (ret) {
pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
enable);
return ret;
}
return 0;
}
static int gpio_regulator_get_enable(struct udevice *dev)
{
struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
return regulator_common_get_enable(dev, &dev_pdata->common);
}
static int gpio_regulator_set_enable(struct udevice *dev, bool enable)
{
struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
return regulator_common_set_enable(dev, &dev_pdata->common, enable);
}
static const struct dm_regulator_ops gpio_regulator_ops = {
.get_value = gpio_regulator_get_value,
.set_value = gpio_regulator_set_value,
.get_enable = gpio_regulator_get_enable,
.set_enable = gpio_regulator_set_enable,
};
static const struct udevice_id gpio_regulator_ids[] = {
{ .compatible = "regulator-gpio" },
{ },
};
U_BOOT_DRIVER(gpio_regulator) = {
.name = "gpio regulator",
.id = UCLASS_REGULATOR,
.ops = &gpio_regulator_ops,
.of_match = gpio_regulator_ids,
.of_to_plat = gpio_regulator_of_to_plat,
.plat_auto = sizeof(struct gpio_regulator_plat),
};
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