Index: linux-2.6.31/arch/powerpc/platforms/83xx/mpc831x_rdb.c
===================================================================
--- linux-2.6.31.orig/arch/powerpc/platforms/83xx/mpc831x_rdb.c	2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31/arch/powerpc/platforms/83xx/mpc831x_rdb.c	2009-10-30 12:44:52.000000000 +0100
@@ -13,6 +13,7 @@
  * option) any later version.
  */
 
+#include <linux/gpio.h>
 #include <linux/pci.h>
 #include <linux/of_platform.h>
 
@@ -20,6 +21,7 @@
 #include <asm/ipic.h>
 #include <asm/udbg.h>
 #include <sysdev/fsl_pci.h>
+#include <sysdev/simple_gpio.h>
 
 #include "mpc83xx.h"
 
@@ -79,7 +81,21 @@
 
 static int __init declare_of_platform_devices(void)
 {
+	struct device_node *np;
+
+	/* declare memory-mapped IO extender */
+	simple_gpiochip_init("fsl,mpc8313-exio");
+
 	of_platform_bus_probe(NULL, of_bus_ids, NULL);
+
+	/* activate USB and RFID */
+	np = of_find_compatible_node(NULL, NULL, "fsl,mpc8313-exio");
+	if (np)
+	{
+		gpio_direction_output(217, 1); // EXIO1 : USB
+		gpio_direction_output(219, 1); // EXIO3 : RFID
+		of_node_put(np);
+	}
 	return 0;
 }
 machine_device_initcall(mpc831x_rdb, declare_of_platform_devices);