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sysreset: Add poweroff-gpio driver

Browse source 
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>
This commit is contained in:
Sebastian Reichel 2020-09-02 19:31:42 +02:00 committed by Stefano Babic
parent 436ba4e0c7
commit 8ccc6bffaa
3 changed files with 100 additions and 0 deletions
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7
drivers/sysreset/Kconfig
View file

@ -43,6 +43,13 @@ config SYSRESET_CMD_POWEROFF
endif
config POWEROFF_GPIO
bool "Enable support for GPIO poweroff driver"
select DM_GPIO
help
Support for system poweroff using a GPIO pin. This can be used
for systems having a single GPIO to trigger a system poweroff.
config SYSRESET_GPIO
bool "Enable support for GPIO reset driver"
select DM_GPIO

1
drivers/sysreset/Makefile
View file

@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o
obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o
obj-$(CONFIG_ARCH_STI) += sysreset_sti.o
obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
obj-$(CONFIG_POWEROFF_GPIO) += poweroff_gpio.o
obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o
obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o
obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o

92
drivers/sysreset/poweroff_gpio.c Normal file
View file

@ -0,0 +1,92 @@
// 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,
};