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watchdog: gpio_wdt: Add option for early registration 

In some situation, mainly when it's not possible to disable a
watchdog, you may want the watchdog driver to be started as soon
as possible.

Adding GPIO_WATCHDOG_ARCH_INITCALL to raise initcall from
module_init to arch_initcall.

This patch require watchdog registration deferral mechanism

Signed-off-by: Jean-Baptiste Theou <jtheou@adeneo-embedded.us>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Jean-Baptiste Theou 2015-06-09 09:55:03 -07:00 committed by Wim Van Sebroeck
parent ef90174f82
commit 5e53c8ed81
2 changed files with 21 additions and 0 deletions
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12
drivers/watchdog/Kconfig
View File

@ -1,3 +1,4 @@
#
# Watchdog device configuration
#
@ -113,6 +114,17 @@ config GPIO_WATCHDOG
If you say yes here you get support for watchdog device
controlled through GPIO-line.
config GPIO_WATCHDOG_ARCH_INITCALL
bool "Register the watchdog as early as possible"
depends on GPIO_WATCHDOG=y
help
In some situations, the default initcall level (module_init)
in not early enough in the boot process to avoid the watchdog
to be triggered.
If you say yes here, the initcall level would be raised to
arch_initcall.
If in doubt, say N.
config MENF21BMC_WATCHDOG
tristate "MEN 14F021P00 BMC Watchdog"
depends on MFD_MENF21BMC

9
drivers/watchdog/gpio_wdt.c
View File

@ -267,7 +267,16 @@ static struct platform_driver gpio_wdt_driver = {
.probe = gpio_wdt_probe,
.remove = gpio_wdt_remove,
};
#ifdef CONFIG_GPIO_WATCHDOG_ARCH_INITCALL
static int __init gpio_wdt_init(void)
{
return platform_driver_register(&gpio_wdt_driver);
}
arch_initcall(gpio_wdt_init);
#else
module_platform_driver(gpio_wdt_driver);
#endif
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("GPIO Watchdog");