diff --git a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
index 2927a812bb26..ac6fb333fee6 100644
--- a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
@@ -1054,6 +1054,19 @@ pins {
 		};
 	};
 
+	usart3_pins_a: usart3-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('B', 10, AF7)>; /* USART3_TX */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('B', 12, AF8)>; /* USART3_RX */
+			bias-disable;
+		};
+	};
+
 	uart4_pins_a: uart4-0 {
 		pins1 {
 			pinmux = <STM32_PINMUX('G', 11, AF6)>; /* UART4_TX */