tty: serial: owl: Implement console driver

Implement serial console driver to complement earlycon.

Based on LeMaker linux-actions tree.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/Kconfig

@@ -1689,7 +1689,7 @@ config SERIAL_MVEBU_CONSOLE
 	  Otherwise, say 'N'.
 
 config SERIAL_OWL
-	bool "Actions Semi Owl serial port support"
+	tristate "Actions Semi Owl serial port support"
 	depends on ARCH_ACTIONS || COMPILE_TEST
 	select SERIAL_CORE
 	help
@@ -1705,7 +1705,7 @@ config SERIAL_OWL_CONSOLE
 	default y
 	help
 	  Say 'Y' here if you wish to use Actions Semiconductor S500/S900 UART
-	  as the system console. Only earlycon is implemented currently.
+	  as the system console.
 
 endmenu
 

include/uapi/linux/serial_core.h

@@ -70,6 +70,7 @@
 #define PORT_CLPS711X	33
 #define PORT_SA1100	34
 #define PORT_UART00	35
+#define PORT_OWL	36
 #define PORT_21285	37
 
 /* Sparc type numbers.  */