[ARM] build fixes for netX serial driver

Make the netX serial driver tristate (as the help text implied). Make the
serial driver build correctly if the netX serial console is disabled. Do not
allow the netX serial console if the netX serial driver is build as a module.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/serial/Kconfig

@@ -1276,7 +1276,7 @@ config SERIAL_SGI_IOC3
 	  say Y or M.  Otherwise, say N.
 
 config SERIAL_NETX
-	bool "NetX serial port support"
+	tristate "NetX serial port support"
 	depends on ARM && ARCH_NETX
 	select SERIAL_CORE
 	help
@@ -1288,7 +1288,7 @@ config SERIAL_NETX
 
 config SERIAL_NETX_CONSOLE
 	bool "Console on NetX serial port"
-	depends on SERIAL_NETX
+	depends on SERIAL_NETX=y
 	select SERIAL_CORE_CONSOLE
 	help
 	  If you have enabled the serial port on the Hilscher NetX SoC

drivers/serial/netx-serial.c

@@ -42,8 +42,6 @@
 #define SERIAL_NX_MAJOR	204
 #define MINOR_START	170
 
-#ifdef CONFIG_SERIAL_NETX_CONSOLE
-
 enum uart_regs {
 	UART_DR              = 0x00,
 	UART_SR              = 0x04,
@@ -528,6 +526,8 @@ static struct netx_port netx_ports[] = {
 	}
 };
 
+#ifdef CONFIG_SERIAL_NETX_CONSOLE
+
 static void netx_console_putchar(struct uart_port *port, int ch)
 {
 	while (readl(port->membase + UART_FR) & FR_BUSY);