diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index dcd0656d67a8..22a5379ea1c9 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -51,9 +51,11 @@
 	};
 
 	firmware {
-		optee {
+		optee: optee {
 			compatible = "linaro,optee-tz";
 			method = "smc";
+			interrupt-parent = <&intc>;
+			interrupts = <GIC_PPI 15 (GIC_CPU_MASK_SIMPLE(1) | IRQ_TYPE_LEVEL_LOW)>;
 		};
 
 		scmi {
diff --git a/arch/arm64/boot/dts/st/stm32mp253.dtsi b/arch/arm64/boot/dts/st/stm32mp253.dtsi
index 029f88981961..69001f924d17 100644
--- a/arch/arm64/boot/dts/st/stm32mp253.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp253.dtsi
@@ -28,3 +28,7 @@
 			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
 	};
 };
+
+&optee {
+	interrupts = <GIC_PPI 15 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
+};