diff --git a/arch/arm/boot/dts/stm32mp157c-dk2.dts b/arch/arm/boot/dts/stm32mp157c-dk2.dts
index d26adcbeba33ea..6e84ee78c1458e 100644
--- a/arch/arm/boot/dts/stm32mp157c-dk2.dts
+++ b/arch/arm/boot/dts/stm32mp157c-dk2.dts
@@ -11,6 +11,13 @@
 / {
 	model = "STMicroelectronics STM32MP157C-DK2 Discovery Board";
 	compatible = "st,stm32mp157c-dk2", "st,stm32mp157";
+
+	reserved-memory {
+		optee_memory: optee@0xde000000 {
+			reg = <0xde000000 0x02000000>;
+			no-map;
+		};
+	};
 };
 
 &dsi {
@@ -79,3 +86,7 @@
 		};
 	};
 };
+
+&optee {
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/stm32mp157c.dtsi b/arch/arm/boot/dts/stm32mp157c.dtsi
index 99655ce12f6aa8..7e1c96e6bfd5b0 100644
--- a/arch/arm/boot/dts/stm32mp157c.dtsi
+++ b/arch/arm/boot/dts/stm32mp157c.dtsi
@@ -33,6 +33,14 @@
 		method = "smc";
 	};
 
+	firmware {
+		optee: optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+			status = "disabled";
+		};
+	};
+
 	intc: interrupt-controller@a0021000 {
 		compatible = "arm,cortex-a7-gic";
 		#interrupt-cells = <3>;