diff --git a/arch/arm64/boot/dts/renesas/r9a09g057.dtsi b/arch/arm64/boot/dts/renesas/r9a09g057.dtsi
index 9581af58024e..6f6fe5f36bef 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g057.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a09g057.dtsi
@@ -1345,6 +1345,7 @@ usb20phyrst: usb20phy-reset@15830000 {
 			resets = <&cpg 0xaf>;
 			power-domains = <&cpg>;
 			#reset-cells = <0>;
+			#mux-state-cells = <1>;
 			status = "disabled";
 		};
 
@@ -1355,6 +1356,7 @@ usb21phyrst: usb21phy-reset@15840000 {
 			resets = <&cpg 0xaf>;
 			power-domains = <&cpg>;
 			#reset-cells = <0>;
+			#mux-state-cells = <1>;
 			status = "disabled";
 		};