ARM: dts: stm32: Define OP-TEE resources on stm32mp15 and enable on DK2

Define OP-TEE firmware node for stm32mp15 based platforms. The node
if disable by default.

Enable the OP-TEE node and define OP-TEE reserved memory for
stm32mp157c-dk2.

Signed-off-by: Etienne Carriere <[email protected]>
[jf: rebase onto v5.9]
Signed-off-by: Jerome Forissier <[email protected]>

Author: etienne-lms

arch/arm/boot/dts/stm32mp151.dtsi

@@ -35,6 +35,14 @@
 		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>;

arch/arm/boot/dts/stm32mp157c-dk2.dts

@@ -16,6 +16,13 @@
 	model = "STMicroelectronics STM32MP157C-DK2 Discovery Board";
 	compatible = "st,stm32mp157c-dk2", "st,stm32mp157";
 
+	reserved-memory {
+		optee_memory: optee@0xde000000 {
+			reg = <0xde000000 0x02000000>;
+			no-map;
+		};
+	};
+
 	aliases {
 		ethernet0 = &ethernet0;
 		serial0 = &uart4;
@@ -99,3 +106,7 @@
 	pinctrl-2 = <&usart2_idle_pins_c>;
 	status = "disabled";
 };
+
+&optee {
+	status = "okay";
+};