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Subject[PATCH v2 3/3] gpio_wdt: Add option for early registration
Date
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 is only for a built-in
module.

This patch require watchdog registration deferral mechanism

Signed-off-by: Jean-Baptiste Theou <jtheou@adeneo-embedded.us>
---
drivers/watchdog/Kconfig | 14 ++++++++++++++
drivers/watchdog/gpio_wdt.c | 13 +++++++++++++
2 files changed, 27 insertions(+)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index e5e7c55..a9655a9 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1,3 +1,4 @@
+
#
# Watchdog device configuration
#
@@ -114,6 +115,19 @@ config MENF21BMC_WATCHDOG
This driver can also be built as a module. If so the module
will be called menf21bmc_wdt.

+config GPIO_WATCHDOG_ARCH_INITCALL
+ bool "Register the watchdog as early as possible"
+ depends on GPIO_WATCHDOG
+ help
+ This option make sense only on a built-in situation.
+
+ In some situation, the default initcall level (module_init)
+ in not early enough on the boot process to avoid the watchdog
+ to be trigger.
+ If you say yes here, the initcall level would be raise to
+ arch_initcall.
+ "If in doubt, leave it out" - say N.
+
config WM831X_WATCHDOG
tristate "WM831x watchdog"
depends on MFD_WM831X
diff --git a/drivers/watchdog/gpio_wdt.c b/drivers/watchdog/gpio_wdt.c
index cbc313d..07a39cd 100644
--- a/drivers/watchdog/gpio_wdt.c
+++ b/drivers/watchdog/gpio_wdt.c
@@ -267,8 +267,21 @@ static struct platform_driver gpio_wdt_driver = {
.probe = gpio_wdt_probe,
.remove = gpio_wdt_remove,
};
+#ifndef GPIO_WATCHDOG_ARCH_INITCALL
module_platform_driver(gpio_wdt_driver);
+#else
+static int __init gpio_wdt_init(void)
+{
+ return platform_driver_register(&gpio_wdt_driver);
+}
+arch_initcall(gpio_wdt_init);

+static void __exit gpio_wdt_exit(void)
+{
+ platform_driver_unregister(&gpio_wdt_driver);
+}
+module_exit(gpio_wdt_exit);
+#endif
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("GPIO Watchdog");
MODULE_LICENSE("GPL");
--
2.4.2


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