diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
index 9ff3b374a2b3..085985356668 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
@@ -79,7 +79,7 @@ ethphy1: ethernet-phy@3 {
 			reset-gpios = <&gpio5 5 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <100000>;
 			micrel,led-mode = <0>;
-			micrel,rmii-reference-clock-select-25-mhz = <1>;
+			micrel,rmii-reference-clock-select-25-mhz;
 		};
 	};
 };
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som.dtsi
index 3fb5e2fb6877..30032be6fdd5 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som.dtsi
@@ -64,7 +64,7 @@ ethphy0: ethernet-phy@1 {
 			reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <100000>;
 			micrel,led-mode = <1>;
-			micrel,rmii-reference-clock-select-25-mhz = <1>;
+			micrel,rmii-reference-clock-select-25-mhz;
 		};
 	};
 };