diff --git a/include/asm-cris/rs485.h b/include/asm-cris/rs485.h
new file mode 100644
index 0000000..c331c51
--- /dev/null
+++ b/include/asm-cris/rs485.h
@@ -0,0 +1,20 @@
+/* RS-485 structures */
+
+/* RS-485 support */
+/* Used with ioctl() TIOCSERSETRS485 */
+struct rs485_control {
+        unsigned short rts_on_send;
+        unsigned short rts_after_sent;
+        unsigned long delay_rts_before_send;
+        unsigned short enabled;
+#ifdef __KERNEL__
+        int disable_serial_loopback;
+#endif
+};
+
+/* Used with ioctl() TIOCSERWRRS485 */
+struct rs485_write {
+        unsigned short outc_size;
+        unsigned char *outc;
+};
+