powerpc/watchdog: Make default timeout for Book-E watchdog a Kconfig option

The PowerPC Book-E watchdog driver (booke_wdt.c) defines a default timeout
value in the code based on whether it's a Freescale Book-E part of not.
Instead of having hard-coded values in the driver, make it a Kconfig
option.

As newer chips gets faster, the current default values become less
appropriate, since the timeout sometimes occurs before the kernel finishes
booting.  Making the value a Kconfig option allows BSPs to configure a new
value without requiring the wdt_period command-line parameter to be set.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index a6812eb31fa1..c356146bd712 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -966,6 +966,23 @@ config BOOKE_WDT
           Please see Documentation/watchdog/watchdog-api.txt for
           more information.
 
+config BOOKE_WDT_DEFAULT_TIMEOUT
+        int "PowerPC Book-E Watchdog Timer Default Timeout"
+        depends on BOOKE_WDT
+        default 38 if FSL_BOOKE
+        range 0 63 if FSL_BOOKE
+        default 3 if !FSL_BOOKE
+        range 0 3 if !FSL_BOOKE
+        help
+          Select the default watchdog timer period to be used by the PowerPC
+          Book-E watchdog driver.  A watchdog "event" occurs when the bit
+          position represented by this number transitions from zero to one.
+
+          For Freescale Book-E processors, this is a number between 0 and 63.
+          For other Book-E processors, this is a number between 0 and 3.
+
+          The value can be overidden by the wdt_period command-line parameter.
+
 # PPC64 Architecture
 
 config WATCHDOG_RTAS