watchdog: tangier: Replace unused constant with a comment

The default timeout value had been left in order to leave some traces
about default setup of watchdog done by firmware.

For better understanding and compiler burden, replace it with a comment.

Suggested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/watchdog/tangier_wdt.c b/drivers/watchdog/tangier_wdt.c
index be4a8f467ac9da474b91c985cc65bcc9983fab6c..b2f40ef0574453b51733ba7db5e5fd3c79e5adb0 100644 (file)
--- a/drivers/watchdog/tangier_wdt.c
+++ b/drivers/watchdog/tangier_wdt.c
@@ -10,7 +10,12 @@
 #define WDT_PRETIMEOUT         15
 #define WDT_TIMEOUT_MIN                (1 + WDT_PRETIMEOUT)
 #define WDT_TIMEOUT_MAX                170
-#define WDT_DEFAULT_TIMEOUT    90
+
+/*
+ * Note, firmware chooses 90 seconds as a default timeout for watchdog on
+ * Intel Tangier SoC. It means that without handling it in the running code
+ * the reboot will happen.
+ */
 
 #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
 #define WATCHDOG_HEARTBEAT 60000