diff --git a/arch/arm/boot/dts/st/stm32mp15x-mecio1-io.dtsi b/arch/arm/boot/dts/st/stm32mp15x-mecio1-io.dtsi
index 1ce01bac9814..1b1299770ca0 100644
--- a/arch/arm/boot/dts/st/stm32mp15x-mecio1-io.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15x-mecio1-io.dtsi
@@ -104,80 +104,79 @@ &adc1 {
 
 	channel@0 {
 		reg = <0>;
-		/* 16.5 ck_cycles sampling time */
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "p24v_stp";
 	};
 
 	channel@1 {
 		reg = <1>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "p24v_hpdcm";
 	};
 
 	channel@2 {
 		reg = <2>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "ain0";
 	};
 
 	channel@3 {
 		reg = <3>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpdcm1_i2";
 	};
 
 	channel@5 {
 		reg = <5>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpout1_i";
 	};
 
 	channel@6 {
 		reg = <6>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "ain1";
 	};
 
 	channel@9 {
 		reg = <9>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpout0_i";
 	};
 
 	channel@10 {
 		reg = <10>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <200000>;
 		label = "phint0_ain";
 	};
 
 	channel@13 {
 		reg = <13>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <200000>;
 		label = "phint1_ain";
 	};
 
 	channel@15 {
 		reg = <15>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpdcm0_i1";
 	};
 
 	channel@16 {
 		reg = <16>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "lsin";
 	};
 
 	channel@18 {
 		reg = <18>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpdcm0_i2";
 	};
 
 	channel@19 {
 		reg = <19>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "hpdcm1_i1";
 	};
 };
@@ -187,14 +186,13 @@ &adc2 {
 
 	channel@2 {
 		reg = <2>;
-		/* 16.5 ck_cycles sampling time */
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "ain2";
 	};
 
 	channel@6 {
 		reg = <6>;
-		st,min-sample-time-ns = <5000>;
+		st,min-sample-time-ns = <20000>;
 		label = "ain3";
 	};
 };