diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index eadf33d..3c35fb2 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -207,6 +207,10 @@
 /* Xilinx PSS UART */
 #define PORT_XUARTPS	98
 
+/* Atheros AR933X SoC */
+#define PORT_AR933X	99
+
+
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>