blackfin: bf60x: pm: Add a debug option to calculate kernel wakeup time.

Display the total time when kernel resumes normal from standby or suspend to mem
mode.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug
index e2a3d4c..79594694 100644
--- a/arch/blackfin/Kconfig.debug
+++ b/arch/blackfin/Kconfig.debug
@@ -253,4 +253,11 @@
 
 	  Most people should say N here.
 
+config BFIN_PM_WAKEUP_TIME_BENCH
+	bool "Display the total time for kernel to resume from power saving mode"
+	default n
+	help
+	  Display the total time when kernel resumes normal from standby or
+	  suspend to mem mode.
+
 endmenu