diff --git a/include/linux/sm501-regs.h b/include/linux/sm501-regs.h
index 8b4ecf0..014e73b3 100644
--- a/include/linux/sm501-regs.h
+++ b/include/linux/sm501-regs.h
@@ -109,6 +109,9 @@
 #define SM501_DEVICEID			(0x000060)
 /* 0x050100A0 */
 
+#define SM501_DEVICEID_SM501		(0x05010000)
+#define SM501_DEVICEID_IDMASK		(0xffff0000)
+
 #define SM501_PLLCLOCK_COUNT		(0x000064)
 #define SM501_MISC_TIMING		(0x000068)
 #define SM501_CURRENT_SDRAM_CLOCK	(0x00006C)