activate serial driver for ASC1 if "use_asc1=x" is given on kernel commandline
mux setup for pins is done via late_initcall, when the gpio driver is initialized

only implemented for EASY98000, generic version t.b.d.
--- a/arch/mips/lantiq/falcon/devices.c
+++ b/arch/mips/lantiq/falcon/devices.c
@@ -75,6 +75,7 @@ void __init falcon_register_asc(int port
 	case 1:
 		platform_device_register_simple("ltq_asc", 1,
 			falcon_asc1_resources, ARRAY_SIZE(falcon_asc1_resources));
+		sys1_hw_activate(ACTS_ASC1_ACT);
 		break;
 	default:
 		break;
--- a/arch/mips/lantiq/falcon/mach-easy98000.c
+++ b/arch/mips/lantiq/falcon/mach-easy98000.c
@@ -15,6 +15,7 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_gpio.h>
 #include <linux/spi/eeprom.h>
+#include <falcon/lantiq_soc.h>
 
 #include "../machtypes.h"
 
@@ -206,9 +207,34 @@ static void __init easy98000_spi_gpio_in
 	platform_device_register(&easy98000_spi_gpio_device);
 }
 
+static int register_asc1 = 0;
+static int __init parse_asc1(char *p)
+{
+	register_asc1 = 1;
+	return 0;
+}
+__setup("use_asc1", parse_asc1);
+
+#define MUXC_SIF_RX_PIN		112
+#define MUXC_SIF_TX_PIN		113
+
+static int __init asc1_mux_setup(void)
+{
+	if (register_asc1) {
+		if (ltq_gpio_request(MUXC_SIF_RX_PIN, 1, 1, 0, "asc1-rx"))
+			return -1;
+		if (ltq_gpio_request(MUXC_SIF_TX_PIN, 1, 1, 1, "asc1-tx"))
+			return -1;
+	}
+	return 0;
+}
+late_initcall(asc1_mux_setup);
+
 static void __init easy98000_init_common(void)
 {
 	falcon_register_asc(0);
+	if (register_asc1)
+		falcon_register_asc(1);
 	falcon_register_gpio();
 	falcon_register_wdt();
 	falcon_register_i2c();