diff --git a/arch/arm/dts/stm32mp157c-odyssey.dts b/arch/arm/dts/stm32mp157c-odyssey.dts
index 17bcf56f744..53ba018197d 100644
--- a/arch/arm/dts/stm32mp157c-odyssey.dts
+++ b/arch/arm/dts/stm32mp157c-odyssey.dts
@@ -75,6 +75,7 @@
 	phy-mode = "rgmii-id";
 	max-speed = <1000>;
 	phy-handle = <&phy0>;
+	st,ext-phyclk;
 
 	mdio0 {
 		#address-cells = <1>;