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/*
* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
* Keerthy <j-keerthy@ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fdtdec.h>
#include <errno.h>
#include <dm.h>
#include <i2c.h>
#include <asm/gpio.h>
#include <power/pmic.h>
#include <power/regulator.h>
#define GPIO_REGULATOR_MAX_STATES 2
DECLARE_GLOBAL_DATA_PTR;
struct gpio_regulator_platdata {
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_ofdata_to_platdata(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
struct gpio_regulator_platdata *dev_pdata;
struct gpio_desc *gpio;
const void *blob = gd->fdt_blob;
int node = dev->of_offset;
int ret, count, i, j;
u32 states_array[8];
dev_pdata = dev_get_platdata(dev);
uc_pdata = dev_get_uclass_platdata(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);
count = fdtdec_get_int_array_count(blob, node, "states",
states_array, 8);
if (!count)
return -EINVAL;
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 0;
}
static int gpio_regulator_get_value(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
int enable;
if (!dev_pdata->gpio.dev)
return -ENOSYS;
uc_pdata = dev_get_uclass_platdata(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_platdata *dev_pdata = dev_get_platdata(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) {
error("Can't set regulator : %s gpio to: %d\n", dev->name,
enable);
return ret;
}
return 0;
}
static const struct dm_regulator_ops gpio_regulator_ops = {
.get_value = gpio_regulator_get_value,
.set_value = gpio_regulator_set_value,
};
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,
.ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
};
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