diff --git a/source_sync_rls_25c/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/uis7885-2h10-overlay.dts b/source_sync_rls_25c/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/uis7885-2h10-overlay.dts
index 0000000..0000000 100644
--- a/source_sync_rls_25c/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/uis7885-2h10-overlay.dts
+++ b/source_sync_rls_25c/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/uis7885-2h10-overlay.dts
@@ -500,6 +500,13 @@
 		output-high;
 		line-name = "rtl8111-3v3-en";
 	};
+
+	serial_level_en {
+		gpio-hog;
+		gpios = <140 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "serial-level-en";
+	};
 };
 
 &ssphy {
diff --git a/source_sync_rls_25c/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/ump9620.dtsi b/source_sync_rls_25c/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/ump9620.dtsi
index 0000000..0000000 100755
--- a/source_sync_rls_25c/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/ump9620.dtsi
+++ b/source_sync_rls_25c/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/ump9620.dtsi
@@ -368,6 +368,7 @@
 				regulator-name = "vddsim2";
 				regulator-min-microvolt = <1200000>;
 				regulator-max-microvolt = <3750000>;
 				regulator-ramp-delay = <25000>;
+				regulator-always-on;
 			};
 
 			vddemmccore: LDO_VDDEMMCCORE {