diff --git a/include/linux/smsc911x.h b/include/linux/smsc911x.h
index b327250..5241e4f 100644
--- a/include/linux/smsc911x.h
+++ b/include/linux/smsc911x.h
@@ -47,4 +47,14 @@
 #define SMSC911X_FORCE_EXTERNAL_PHY 		(BIT(3))
 #define SMSC911X_SAVE_MAC_ADDRESS		(BIT(4))
 
+/*
+ * SMSC911X_SWAP_FIFO:
+ * Enables software byte swap for fifo data. Should only be used as a
+ * "last resort" in the case of big endian mode on boards with incorrectly
+ * routed data bus to older devices such as LAN9118. Newer devices such as
+ * LAN9221 can handle this in hardware, there are registers to control
+ * this swapping but the driver doesn't currently use them.
+ */
+#define SMSC911X_SWAP_FIFO			(BIT(5))
+
 #endif /* __LINUX_SMSC911X_H__ */