diff --git a/arch/arm/boot/dts/st/stm32mp135f-dhcor-dhsbc.dts b/arch/arm/boot/dts/st/stm32mp135f-dhcor-dhsbc.dts
index bacb70b4256b..201fb6a291cc 100644
--- a/arch/arm/boot/dts/st/stm32mp135f-dhcor-dhsbc.dts
+++ b/arch/arm/boot/dts/st/stm32mp135f-dhcor-dhsbc.dts
@@ -94,6 +94,7 @@ ethphy1: ethernet-phy@1 {
 			interrupt-parent = <&gpiog>;
 			interrupts = <12 IRQ_TYPE_LEVEL_LOW>;
 			reg = <1>;
+			realtek,clkout-disable;
 			reset-assert-us = <15000>;
 			reset-deassert-us = <55000>;
 			reset-gpios = <&gpioa 11 GPIO_ACTIVE_LOW>;
@@ -121,6 +122,7 @@ ethphy2: ethernet-phy@1 {
 			interrupt-parent = <&gpiog>;
 			interrupts = <15 IRQ_TYPE_LEVEL_LOW>;
 			reg = <1>;
+			realtek,clkout-disable;
 			reset-assert-us = <15000>;
 			reset-deassert-us = <55000>;
 			reset-gpios = <&gpiog 8 GPIO_ACTIVE_LOW>;