diff --git a/target/linux/realtek/dts-5.10/rtl839x.dtsi b/target/linux/realtek/dts-5.10/rtl839x.dtsi
index 2091fe0ba33..78e2454b7e2 100644
--- a/target/linux/realtek/dts-5.10/rtl839x.dtsi
+++ b/target/linux/realtek/dts-5.10/rtl839x.dtsi
@@ -29,6 +29,13 @@
 		reg = <##n>; \
 	};
 
+#define EXTERNAL_SFP_PHY_FULL(n, s) \
+	phy##n: ethernet-phy@##n { \
+		compatible = "ethernet-phy-ieee802.3-c22"; \
+		sfp = <&sfp##s>; \
+		reg = <##n>; \
+	};
+
 #define SWITCH_PORT(n, s, m) \
 	port@##n { \
 		reg = <##n>; \