[usb-devel]Who is the parent device of a root hub?

I found this routine,
/**
 * usb_register_root_hub - called by HCD to register its root hub
 * @usb_dev: the usb root hub device to be registered.
 * @parent_dev: the parent device of this root hub.
 *
 * The USB host controller calls this function to register the root hub
 * properly with the USB subsystem.  It sets up the device properly in
 * the device tree and stores the root_hub pointer in the bus structure,
 * then calls usb_new_device() to register the usb device.  It also
 * assigns the root hub's USB address (always 1).
 */
int usb_register_root_hub (struct usb_device *usb_dev, struct device
*parent_dev)

But who is the parent device of a root hub?The host controller?

Thanks&Regards
Jason Xiao

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