Allow USB and serial to co-exist on N2100 by using a platform device for
serial and IRQ 0 for serial.

--- a/arch/arm/mach-iop3xx/iop321-setup.c~	2006-10-26 22:06:04.000000000 +0000
+++ b/arch/arm/mach-iop3xx/iop321-setup.c	2006-10-27 07:33:24.663719957 +0000
@@ -131,7 +131,7 @@
 void __init iop321_map_io(void)
 {
 	iotable_init(iop321_std_desc, ARRAY_SIZE(iop321_std_desc));
-	if (!machine_is_glantank())
+	if (!machine_is_glantank() && !machine_is_n2100())
 		early_serial_setup(&iop321_serial_ports[0]);
 }
 
--- a/arch/arm/mach-iop3xx/n2100.c~	2006-10-26 22:23:24.000000000 +0000
+++ b/arch/arm/mach-iop3xx/n2100.c	2006-10-27 07:32:15.130694184 +0000
@@ -170,6 +170,40 @@
 
 
 /*
+ * N2100 machine initialisation.
+ */
+
+static struct plat_serial8250_port n2100_serial_port[] = {
+	{
+		.mapbase	= N2100_UART,
+		.membase	= (char *)N2100_UART,
+		.irq		= 0,
+		.flags		= UPF_SKIP_TEST,
+		.iotype		= UPIO_MEM,
+		.regshift	= 0,
+		.uartclk	= 1843200,
+	},
+	{ },
+};
+
+static struct resource n2100_uart_resource = {
+	.start		= N2100_UART,
+	.end		= N2100_UART + 7,
+	.flags		= IORESOURCE_MEM,
+};
+
+static struct platform_device n2100_serial_device = {
+	.name		= "serial8250",
+	.id		= PLAT8250_DEV_PLATFORM,
+	.dev		= {
+		.platform_data		= n2100_serial_port,
+	},
+	.num_resources	= 1,
+	.resource	= &n2100_uart_resource,
+};
+
+
+/*
  * Pull PCA9532 GPIO #8 low to power off the machine.
  */
 static void n2100_power_off(void)
@@ -212,6 +246,7 @@
 static void __init n2100_init_machine(void)
 {
 	platform_device_register(&iop32x_i2c_0_controller);
+	platform_device_register(&n2100_serial_device);
 
 	pm_power_off = n2100_power_off;