You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
3.2 KiB
140 lines
3.2 KiB
8 months ago
|
/*
|
||
|
|
* (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;
|
||
|
|
int ret, len, 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);
|
||
|
|
|
||
|
|
len = dev_read_size(dev, "states");
|
||
|
|
if (len < 0)
|
||
|
|
return len;
|
||
|
|
|
||
|
|
len /= sizeof(fdt32_t);
|
||
|
|
|
||
|
|
ret = dev_read_u32_array(dev, "states", states_array, len);
|
||
|
|
if (ret)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
for (i = 0, j = 0; i < len; 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) {
|
||
|
|
pr_err("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),
|
||
|
|
};
|