diff --git a/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi
index 78c967812492..c3d4d916c69b 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi
+++ b/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi
@@ -356,7 +356,6 @@ vuart: serial@1e787000 {
 			lpc: lpc@1e789000 {
 				compatible = "aspeed,ast2400-lpc-v2", "simple-mfd", "syscon";
 				reg = <0x1e789000 0x1000>;
-				reg-io-width = <4>;
 
 				#address-cells = <1>;
 				#size-cells = <1>;
diff --git a/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi
index 57a699a7c149..39500bdb4747 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi
@@ -273,7 +273,6 @@ hace: crypto@1e6e3000 {
 			gfx: display@1e6e6000 {
 				compatible = "aspeed,ast2500-gfx", "syscon";
 				reg = <0x1e6e6000 0x1000>;
-				reg-io-width = <4>;
 				clocks = <&syscon ASPEED_CLK_GATE_D1CLK>;
 				resets = <&syscon ASPEED_RESET_CRT1>;
 				syscon = <&syscon>;
@@ -441,7 +440,6 @@ vuart: serial@1e787000 {
 			lpc: lpc@1e789000 {
 				compatible = "aspeed,ast2500-lpc-v2", "simple-mfd", "syscon";
 				reg = <0x1e789000 0x1000>;
-				reg-io-width = <4>;
 
 				#address-cells = <1>;
 				#size-cells = <1>;
diff --git a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
index 61983feb2a4e..f8662c8ac089 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
+++ b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
@@ -382,7 +382,6 @@ rng: hwrng@1e6e2524 {
 			gfx: display@1e6e6000 {
 				compatible = "aspeed,ast2600-gfx", "syscon";
 				reg = <0x1e6e6000 0x1000>;
-				reg-io-width = <4>;
 				clocks = <&syscon ASPEED_CLK_GATE_D1CLK>;
 				resets = <&syscon ASPEED_RESET_GRAPHICS>;
 				syscon = <&syscon>;
@@ -572,7 +571,6 @@ peci0: peci-controller@1e78b000 {
 			lpc: lpc@1e789000 {
 				compatible = "aspeed,ast2600-lpc-v2", "simple-mfd", "syscon";
 				reg = <0x1e789000 0x1000>;
-				reg-io-width = <4>;
 
 				#address-cells = <1>;
 				#size-cells = <1>;