2 files changed, 31 insertions, 5 deletions

diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c
index ad778b481f..749257cf6d 100644
--- a/drivers/usb/host/usb-uclass.c
+++ b/drivers/usb/host/usb-uclass.c
@@ -171,6 +171,7 @@ static void usb_scan_bus(struct udevice *bus, bool recurse)
 int usb_init(void)
 {
 	int controllers_initialized = 0;
+	struct usb_bus_priv *priv;
 	struct udevice *bus;
 	struct uclass *uc;
 	int count = 0;
@@ -198,15 +199,37 @@ int usb_init(void)
 			printf("probe failed, error %d\n", ret);
 			continue;
 		}
-		/*
-		 * lowlevel init is OK, now scan the bus for devices
-		 * i.e. search HUBs and configure them
-		 */
 		controllers_initialized++;
-		usb_scan_bus(bus, true);
 		usb_started = true;
 	}
 
+	/*
+	 * lowlevel init done, now scan the bus for devices i.e. search HUBs
+	 * and configure them, first scan primary controllers.
+	 */
+	uclass_foreach_dev(bus, uc) {
+		if (!device_active(bus))
+			continue;
+
+		priv = dev_get_uclass_priv(bus);
+		if (!priv->companion)
+			usb_scan_bus(bus, true);
+	}
+
+	/*
+	 * Now that the primary controllers have been scanned and have handed
+	 * over any devices they do not understand to their companions, scan
+	 * the companions.
+	 */
+	uclass_foreach_dev(bus, uc) {
+		if (!device_active(bus))
+			continue;
+
+		priv = dev_get_uclass_priv(bus);
+		if (priv->companion)
+			usb_scan_bus(bus, true);
+	}
+
 	debug("scan end\n");
 	/* if we were not able to find at least one working bus, bail out */
 	if (!count)
diff --git a/include/usb.h b/include/usb.h
index 609b13d2af..5043bc3984 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -608,10 +608,13 @@ struct usb_dev_platdata {
  * @desc_before_addr:	true if we can read a device descriptor before it
  *		has been assigned an address. For XHCI this is not possible
  *		so this will be false.
+ * @companion:  True if this is a companion controller to another USB
+ *		controller
  */
 struct usb_bus_priv {
 	int next_addr;
 	bool desc_before_addr;
+	bool companion;
 };
 
 /**