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Subject[PATCH v4 2/2] 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 patch require watchdog registration deferral mechanism

Signed-off-by: Jean-Baptiste Theou <jtheou@adeneo-embedded.us>
---
Changes in v4:
- Fix symbol
- Add empty line

Changes in v3:
- Simplify changes, since the modification is for built-in only


drivers/watchdog/Kconfig | 12 ++++++++++++
drivers/watchdog/gpio_wdt.c | 9 +++++++++
2 files changed, 21 insertions(+)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index e5e7c55..7a5c912 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1,3 +1,4 @@
+
#
# Watchdog device configuration
#
@@ -104,6 +105,17 @@ 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
diff --git a/drivers/watchdog/gpio_wdt.c b/drivers/watchdog/gpio_wdt.c
index cbc313d..1687cc2 100644
--- a/drivers/watchdog/gpio_wdt.c
+++ b/drivers/watchdog/gpio_wdt.c
@@ -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");
--
2.4.2


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