watchdog: Handle SPL build with watchdog disabled

This patch adds some checks, so that the watchdog can be enabled in main
U-Boot proper but can be disabled in SPL.

This will be used by some AT91SAM based boards, which might enable the
watchdog in the main U-Boot proper and not in SPL. It will be enabled in
SPL by default there, so no need to configure it there. This approach
saves some space in SPL.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Andreas Bießmann <andreas@biessmann.org>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Tested on the taurus board:
Tested-by: Heiko Schocher <hs@denx.de>

diff --git a/include/watchdog.h b/include/watchdog.h
index 14073cf..3a357de 100644 (file)
--- a/include/watchdog.h
+++ b/include/watchdog.h
@@ -51,9 +51,15 @@ int init_func_watchdog_reset(void);
                #if defined(__ASSEMBLY__)
                        #define WATCHDOG_RESET bl watchdog_reset
                #else
-                       extern void watchdog_reset(void);
+                       /* Don't require the watchdog to be enabled in SPL */
+                       #if defined(CONFIG_SPL_BUILD) &&                \
+                               !defined(CONFIG_SPL_WATCHDOG_SUPPORT)
+                               #define WATCHDOG_RESET() {}
+                       #else
+                               extern void watchdog_reset(void);
 
-                       #define WATCHDOG_RESET watchdog_reset
+                               #define WATCHDOG_RESET watchdog_reset
+                       #endif
                #endif
        #else
                /*