ARM: dts: stm32: enable optee firmware and SCMI support on STM32MP15

Enable optee and SCMI clocks/reset protocols support.
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32mp151.dtsi

@@ -115,6 +115,33 @@ booster: regulator-booster {
 		status = "disabled";
 	};
 
+	firmware {
+		optee: optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+			status = "disabled";
+		};
+
+		scmi: scmi {
+			compatible = "linaro,scmi-optee";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			linaro,optee-channel-id = <0>;
+			shmem = <&scmi_shm>;
+			status = "disabled";
+
+			scmi_clk: protocol@14 {
+				reg = <0x14>;
+				#clock-cells = <1>;
+			};
+
+			scmi_reset: protocol@16 {
+				reg = <0x16>;
+				#reset-cells = <1>;
+			};
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -122,6 +149,20 @@ soc {
 		interrupt-parent = <&intc>;
 		ranges;
 
+		scmi_sram: sram@2ffff000 {
+			compatible = "mmio-sram";
+			reg = <0x2ffff000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x2ffff000 0x1000>;
+
+			scmi_shm: scmi-sram@0 {
+				compatible = "arm,scmi-shmem";
+				reg = <0 0x80>;
+				status = "disabled";
+			};
+		};
+
 		timers2: timer@40000000 {
 			#address-cells = <1>;
 			#size-cells = <0>;