diff --git a/include/dt-bindings/phy/nuvoton,npcm-usbphy.h b/include/dt-bindings/phy/nuvoton,npcm-usbphy.h
new file mode 100644
index 0000000..46946d3
--- /dev/null
+++ b/include/dt-bindings/phy/nuvoton,npcm-usbphy.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (c) 2023 Nuvoton Technology corporation.
+
+#ifndef _DT_BINDINGS_NPCM_USBPHY_H
+#define _DT_BINDINGS_NPCM_USBPHY_H
+
+#define NPCM_UDC0_7		0
+#define NPCM_UDC8		1
+#define NPCM_UDC9		2
+#define NPCM_USBH1		3
+#define NPCM_USBH2		4
+#define NPCM_MAX_USB_CTRL_ID	4
+
+#endif