SERIAL: AR933X: Add driver for the built-in UART of the SoC

This patch adds the driver for the built-in UART of the
Atheros AR933X SoCs.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Kathy Giori <kgiori@qca.qualcomm.com>
Cc: "Luis R.  Rodriguez" <rodrigue@qca.qualcomm.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-serial@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2526/
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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>