diff --git a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
index 7b4249ed1983..060baa8b7e9d 100644
--- a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
@@ -1891,10 +1891,15 @@
 	usart2_idle_pins_c: usart2-idle-2 {
 		pins1 {
 			pinmux = <STM32_PINMUX('D', 5, ANALOG)>, /* USART2_TX */
-				 <STM32_PINMUX('D', 4, ANALOG)>, /* USART2_RTS */
 				 <STM32_PINMUX('D', 3, ANALOG)>; /* USART2_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('D', 4, AF7)>; /* USART2_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <3>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('D', 6, AF7)>; /* USART2_RX */
 			bias-disable;
 		};
@@ -1940,10 +1945,15 @@
 	usart3_idle_pins_b: usart3-idle-1 {
 		pins1 {
 			pinmux = <STM32_PINMUX('B', 10, ANALOG)>, /* USART3_TX */
-				 <STM32_PINMUX('G', 8, ANALOG)>, /* USART3_RTS */
 				 <STM32_PINMUX('I', 10, ANALOG)>; /* USART3_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('G', 8, AF8)>; /* USART3_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('B', 12, AF8)>; /* USART3_RX */
 			bias-disable;
 		};
@@ -1976,10 +1986,15 @@
 	usart3_idle_pins_c: usart3-idle-2 {
 		pins1 {
 			pinmux = <STM32_PINMUX('B', 10, ANALOG)>, /* USART3_TX */
-				 <STM32_PINMUX('G', 8, ANALOG)>, /* USART3_RTS */
 				 <STM32_PINMUX('B', 13, ANALOG)>; /* USART3_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('G', 8, AF8)>; /* USART3_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('B', 12, AF8)>; /* USART3_RX */
 			bias-disable;
 		};