usb: lowlevel interface change to support multiple controllers

Carry an index in the lowlevel usb functions to make specify the
respective usb controller.

Also pass through an controller struct from lowlevel_init to the
creation of the root usb device of this controller.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/include/usb.h b/include/usb.h
index ba3d169..292a042 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -140,6 +140,8 @@
 	int portnr;
 	struct usb_device *parent;
 	struct usb_device *children[USB_MAXCHILDREN];
+
+	void *controller;		/* hardware controller private data */
 };
 
 /**********************************************************************
@@ -153,8 +155,9 @@
 	defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \
 	defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X)
 
-int usb_lowlevel_init(void);
-int usb_lowlevel_stop(void);
+int usb_lowlevel_init(int index, void **controller);
+int usb_lowlevel_stop(int index);
+
 int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
 			void *buffer, int transfer_len);
 int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
@@ -382,7 +385,8 @@
 int hub_port_reset(struct usb_device *dev, int port,
 			  unsigned short *portstat);
 
-struct usb_device *usb_alloc_new_device(void);
+struct usb_device *usb_alloc_new_device(void *controller);
+
 int usb_new_device(struct usb_device *dev);
 
 #endif /*_USB_H_ */