diff --git a/drivers/usb/mtu3/mtu3_dr.h b/drivers/usb/mtu3/mtu3_dr.h
new file mode 100644
index 0000000..ec0e50c
--- /dev/null
+++ b/drivers/usb/mtu3/mtu3_dr.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * mtu3_dr.h - dual role switch and host glue layer header
+ *
+ * Copyright (C) 2016 MediaTek Inc.
+ *
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ */
+
+#ifndef _MTU3_DR_H_
+#define _MTU3_DR_H_
+
+#if IS_ENABLED(CONFIG_USB_MTU3_HOST)
+
+int ssusb_host_init(struct ssusb_mtk *ssusb);
+void ssusb_host_exit(struct ssusb_mtk *ssusb);
+
+#else
+
+static inline int ssusb_host_init(struct ssusb_mtk *ssusb)
+{
+	return 0;
+}
+
+static inline void ssusb_host_exit(struct ssusb_mtk *ssusb)
+{}
+
+#endif
+
+#if IS_ENABLED(CONFIG_USB_MTU3_GADGET)
+int ssusb_gadget_init(struct ssusb_mtk *ssusb);
+void ssusb_gadget_exit(struct ssusb_mtk *ssusb);
+irqreturn_t mtu3_irq(int irq, void *data);
+#else
+static inline int ssusb_gadget_init(struct ssusb_mtk *ssusb)
+{
+	return 0;
+}
+
+static inline void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
+{}
+
+static inline irqreturn_t mtu3_irq(int irq, void *data)
+{
+	return IRQ_NONE;
+}
+#endif
+
+void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
+			  enum mtu3_dr_force_mode mode);
+
+#endif		/* _MTU3_DR_H_ */