usb: fix ehci_hcd build failure when both generic-OF and xilinx is selected

This patch fixes the driver to allow both CONFIG_USB_EHCI_HCD_PPC_OF and
CONFIG_USB_ECHI_HCD_XILINX to be selected.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
CC: John Linn <john.linn@xilinx.com>
CC: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hcd.c

@@ -1135,7 +1135,7 @@ MODULE_LICENSE ("GPL");
 
 #ifdef CONFIG_XPS_USB_HCD_XILINX
 #include "ehci-xilinx-of.c"
-#define OF_PLATFORM_DRIVER	ehci_hcd_xilinx_of_driver
+#define XILINX_OF_PLATFORM_DRIVER	ehci_hcd_xilinx_of_driver
 #endif
 
 #ifdef CONFIG_PLAT_ORION
@@ -1159,7 +1159,8 @@ MODULE_LICENSE ("GPL");
 #endif
 
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
-    !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
+    !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
+    !defined(XILINX_OF_PLATFORM_DRIVER)
 #error "missing bus glue for ehci-hcd"
 #endif
 
@@ -1213,10 +1214,20 @@ static int __init ehci_hcd_init(void)
 	if (retval < 0)
 		goto clean3;
 #endif
+
+#ifdef XILINX_OF_PLATFORM_DRIVER
+	retval = of_register_platform_driver(&XILINX_OF_PLATFORM_DRIVER);
+	if (retval < 0)
+		goto clean4;
+#endif
 	return retval;
 
+#ifdef XILINX_OF_PLATFORM_DRIVER
+	/* of_unregister_platform_driver(&XILINX_OF_PLATFORM_DRIVER); */
+clean4:
+#endif
 #ifdef OF_PLATFORM_DRIVER
-	/* of_unregister_platform_driver(&OF_PLATFORM_DRIVER); */
+	of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
 clean3:
 #endif
 #ifdef PS3_SYSTEM_BUS_DRIVER
@@ -1243,6 +1254,9 @@ module_init(ehci_hcd_init);
 
 static void __exit ehci_hcd_cleanup(void)
 {
+#ifdef XILINX_OF_PLATFORM_DRIVER
+	of_unregister_platform_driver(&XILINX_OF_PLATFORM_DRIVER);
+#endif
 #ifdef OF_PLATFORM_DRIVER
 	of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
 #endif