diff --git a/arch/arm64/boot/dts/renesas/r8a77965.dtsi b/arch/arm64/boot/dts/renesas/r8a77965.dtsi
index 0536b94a5ec0..1a219674201f 100644
--- a/arch/arm64/boot/dts/renesas/r8a77965.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a77965.dtsi
@@ -795,6 +795,7 @@
 
 		usb3_phy0: usb-phy@e65ee000 {
 			reg = <0 0xe65ee000 0 0x90>;
+			#phy-cells = <0>;
 			/* placeholder */
 		};