dm: usb: Add a new USB controller operation 'update_hub_device'

For USB host controllers like xHC, its internal representation of
hub needs to be updated after the hub descriptor is fetched. This
adds a new op that does this.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/usb/host/usb-uclass.c

@@ -139,6 +139,17 @@ int usb_reset_root_port(struct usb_device *udev)
 	return ops->reset_root_port(bus, udev);
 }
 
+int usb_update_hub_device(struct usb_device *udev)
+{
+	struct udevice *bus = udev->controller_dev;
+	struct dm_usb_ops *ops = usb_get_ops(bus);
+
+	if (!ops->update_hub_device)
+		return -ENOSYS;
+
+	return ops->update_hub_device(bus, udev);
+}
+
 int usb_stop(void)
 {
 	struct udevice *bus;

include/usb.h

@@ -758,6 +758,14 @@ struct dm_usb_ops {
 	 * reset_root_port() - Reset usb root port
 	 */
 	int (*reset_root_port)(struct udevice *bus, struct usb_device *udev);
+
+	/**
+	 * update_hub_device() - Update HCD's internal representation of hub
+	 *
+	 * After a hub descriptor is fetched, notify HCD so that its internal
+	 * representation of this hub can be updated (xHCI)
+	 */
+	int (*update_hub_device)(struct udevice *bus, struct usb_device *udev);
 };
 
 #define usb_get_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)
@@ -930,6 +938,17 @@ int usb_new_device(struct usb_device *dev);
 
 int usb_alloc_device(struct usb_device *dev);
 
+/**
+ * update_hub_device() - Update HCD's internal representation of hub
+ *
+ * After a hub descriptor is fetched, notify HCD so that its internal
+ * representation of this hub can be updated.
+ *
+ * @dev:		Hub device
+ * @return 0 if OK, -ve on error
+ */
+int usb_update_hub_device(struct usb_device *dev);
+
 /**
  * usb_emul_setup_device() - Set up a new USB device emulation
  *
@@ -943,7 +962,7 @@ int usb_alloc_device(struct usb_device *dev);
  * @desc_list:		List of points or USB descriptors, terminated by NULL.
  *			The first entry must be struct usb_device_descriptor,
  *			and others follow on after that.
- * @return 0 if OK, -ve on error
+ * @return 0 if OK, -ENOSYS if not implemented, other -ve on error
  */
 int usb_emul_setup_device(struct udevice *dev, int maxpacketsize,
 			  struct usb_string *strings, void **desc_list);