diff --git a/drivers/usb/core/phy.h b/drivers/usb/core/phy.h
index bbc969383074..88a3c037e9df 100644
--- a/drivers/usb/core/phy.h
+++ b/drivers/usb/core/phy.h
@@ -1,3 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * USB roothub wrapper
+ *
+ * Copyright (C) 2018 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ */
+
+#ifndef __USB_CORE_PHY_H_
+#define __USB_CORE_PHY_H_
+
 struct device;
 struct usb_phy_roothub;
 
@@ -13,3 +23,5 @@ int usb_phy_roothub_suspend(struct device *controller_dev,
 			    struct usb_phy_roothub *phy_roothub);
 int usb_phy_roothub_resume(struct device *controller_dev,
 			   struct usb_phy_roothub *phy_roothub);
+
+#endif /* __USB_CORE_PHY_H_ */