diff --git a/target/linux/realtek/dts/rtl838x.dtsi b/target/linux/realtek/dts/rtl838x.dtsi
index 3b17c66c0b..ab81c49f8a 100644
--- a/target/linux/realtek/dts/rtl838x.dtsi
+++ b/target/linux/realtek/dts/rtl838x.dtsi
@@ -202,6 +202,8 @@
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
 		reg = <0x1b000000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 
 		mdio_ctrl: mdio-controller {
 			compatible = "realtek,rtl8380-mdio", "realtek,otto-mdio";
diff --git a/target/linux/realtek/dts/rtl839x.dtsi b/target/linux/realtek/dts/rtl839x.dtsi
index 9eb4be8af8..6b4f4821a2 100644
--- a/target/linux/realtek/dts/rtl839x.dtsi
+++ b/target/linux/realtek/dts/rtl839x.dtsi
@@ -210,6 +210,8 @@
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
 		reg = <0x1b000000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 
 		mdio_ctrl: mdio-controller {
 			compatible = "realtek,rtl8392-mdio", "realtek,otto-mdio";
diff --git a/target/linux/realtek/dts/rtl930x.dtsi b/target/linux/realtek/dts/rtl930x.dtsi
index 97bf6abe5d..ad06cef6cd 100644
--- a/target/linux/realtek/dts/rtl930x.dtsi
+++ b/target/linux/realtek/dts/rtl930x.dtsi
@@ -160,6 +160,8 @@
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
 		reg = <0x1b000000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 
 		i2c_mst1: i2c@36c {
 			compatible = "realtek,rtl9301-i2c";
diff --git a/target/linux/realtek/dts/rtl931x.dtsi b/target/linux/realtek/dts/rtl931x.dtsi
index 352e9547f0..d7b789b9bb 100644
--- a/target/linux/realtek/dts/rtl931x.dtsi
+++ b/target/linux/realtek/dts/rtl931x.dtsi
@@ -190,6 +190,8 @@
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
 		reg = <0x1b000000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 
 		i2c_mst1: i2c@100c {
 			compatible = "realtek,rtl9310-i2c";