diff --git a/target/linux/realtek/dts/rtl838x.dtsi b/target/linux/realtek/dts/rtl838x.dtsi
index abce9500fee..8f44de8bdcf 100644
--- a/target/linux/realtek/dts/rtl838x.dtsi
+++ b/target/linux/realtek/dts/rtl838x.dtsi
@@ -252,7 +252,7 @@
 
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
-		reg = <0x1b000000 0x20000>;
+		reg = <0x1b000000 0x10000>;
 
 		mdio_aux: mdio-aux {
 			compatible = "realtek,rtl8380-aux-mdio";
diff --git a/target/linux/realtek/dts/rtl839x.dtsi b/target/linux/realtek/dts/rtl839x.dtsi
index 84473fa2c3f..98c69a5d34b 100644
--- a/target/linux/realtek/dts/rtl839x.dtsi
+++ b/target/linux/realtek/dts/rtl839x.dtsi
@@ -260,7 +260,7 @@
 
 	switchcore@1b000000 {
 		compatible = "syscon", "simple-mfd";
-		reg = <0x1b000000 0x20000>;
+		reg = <0x1b000000 0x10000>;
 
 		mdio_aux: mdio-aux {
 			compatible = "realtek,rtl8390-aux-mdio";
diff --git a/target/linux/realtek/dts/rtl931x.dtsi b/target/linux/realtek/dts/rtl931x.dtsi
index 61599e89b54..ad10272d7a8 100644
--- a/target/linux/realtek/dts/rtl931x.dtsi
+++ b/target/linux/realtek/dts/rtl931x.dtsi
@@ -161,6 +161,11 @@
 		};
 	};
 
+	switchcore@1b000000 {
+		compatible = "syscon", "simple-mfd";
+		reg = <0x1b000000 0x10000>;
+	};
+
 	pinmux: pinmux@1b001358 {
 		compatible = "pinctrl-single";
 		reg = <0x1b001358 0x4>;