mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
8ccc6bffaa
Add GPIO poweroff driver, which is based on the Linux driver and uses the same DT binding. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Toggles a GPIO pin to power down a device
|
|
*
|
|
* Created using the Linux driver as reference, which
|
|
* has been written by:
|
|
*
|
|
* Jamie Lentin <jm@lentin.co.uk>
|
|
* Andrew Lunn <andrew@lunn.ch>
|
|
*
|
|
* Copyright (C) 2012 Jamie Lentin
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <log.h>
|
|
#include <sysreset.h>
|
|
|
|
#include <asm/gpio.h>
|
|
#include <linux/delay.h>
|
|
|
|
struct poweroff_gpio_info {
|
|
struct gpio_desc gpio;
|
|
u32 active_delay_ms;
|
|
u32 inactive_delay_ms;
|
|
u32 timeout_ms;
|
|
};
|
|
|
|
static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type)
|
|
{
|
|
struct poweroff_gpio_info *priv = dev_get_priv(dev);
|
|
int r;
|
|
|
|
if (type != SYSRESET_POWER_OFF)
|
|
return -ENOSYS;
|
|
|
|
debug("GPIO poweroff\n");
|
|
|
|
/* drive it active, also inactive->active edge */
|
|
r = dm_gpio_set_value(&priv->gpio, 1);
|
|
if (r < 0)
|
|
return r;
|
|
mdelay(priv->active_delay_ms);
|
|
|
|
/* drive inactive, also active->inactive edge */
|
|
r = dm_gpio_set_value(&priv->gpio, 0);
|
|
if (r < 0)
|
|
return r;
|
|
mdelay(priv->inactive_delay_ms);
|
|
|
|
/* drive it active, also inactive->active edge */
|
|
r = dm_gpio_set_value(&priv->gpio, 1);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* give it some time */
|
|
mdelay(priv->timeout_ms);
|
|
|
|
return -EINPROGRESS;
|
|
}
|
|
|
|
static int poweroff_gpio_probe(struct udevice *dev)
|
|
{
|
|
struct poweroff_gpio_info *priv = dev_get_priv(dev);
|
|
int flags;
|
|
|
|
flags = dev_read_bool(dev, "input") ? GPIOD_IS_IN : GPIOD_IS_OUT;
|
|
priv->active_delay_ms = dev_read_u32_default(dev, "active-delay-ms", 100);
|
|
priv->inactive_delay_ms = dev_read_u32_default(dev, "inactive-delay-ms", 100);
|
|
priv->timeout_ms = dev_read_u32_default(dev, "timeout-ms", 3000);
|
|
|
|
return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags);
|
|
}
|
|
|
|
static struct sysreset_ops poweroff_gpio_ops = {
|
|
.request = poweroff_gpio_request,
|
|
};
|
|
|
|
static const struct udevice_id poweroff_gpio_ids[] = {
|
|
{ .compatible = "gpio-poweroff", },
|
|
{},
|
|
};
|
|
|
|
U_BOOT_DRIVER(poweroff_gpio) = {
|
|
.name = "poweroff-gpio",
|
|
.id = UCLASS_SYSRESET,
|
|
.ops = &poweroff_gpio_ops,
|
|
.probe = poweroff_gpio_probe,
|
|
.priv_auto_alloc_size = sizeof(struct poweroff_gpio_info),
|
|
.of_match = poweroff_gpio_ids,
|
|
};
|