diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index 09d6226d598f..e6b8ffd332c7 100644
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -26,6 +26,17 @@
 		reg = <0xc0000000 0x20000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		optee@dd000000 {
+			reg = <0xdd000000 0x3000000>;
+			no-map;
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";