arm64: dts: apple: Add SMC to M3 (t8122) device tree

Adds the System Management Contorller (SMC) to the Apple
M3 SoC (t8122) device tree, including the SMC mailbox and
the SMC itself, with GPIO and hwmon children.

Signed-off-by: Michael Reeves <michael.reeves077@gmail.com>

Author: IntegralPilot

arch/arm64/boot/dts/apple/t8122.dtsi

@@ -397,6 +397,33 @@
 			interrupts = <AIC_IRQ 432 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+		smc_mbox: mbox@2ec408000 {
+			compatible = "apple,t8122-asc-mailbox", "apple,asc-mailbox-v4";
+			reg = <0x2 0xec408000 0x0 0x4000>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 502 IRQ_TYPE_LEVEL_HIGH>,
+				<AIC_IRQ 503 IRQ_TYPE_LEVEL_HIGH>,
+				<AIC_IRQ 504 IRQ_TYPE_LEVEL_HIGH>,
+				<AIC_IRQ 505 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "send-empty", "send-not-empty",
+				"recv-empty", "recv-not-empty";
+			#mbox-cells = <0>;
+		};
+
+		smc: smc@2ec400000 {
+			compatible = "apple,t8122-smc", "apple,t8103-smc";
+			reg = <0x2 0xec400000 0x0 0x4000>,
+				<0x2 0xede00000 0x0 0x100000>;
+			reg-names = "smc", "sram";
+			mboxes = <&smc_mbox>;
+
+			smc_gpio: gpio {
+				compatible = "apple,smc-gpio";
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+		};
+
 		pinctrl_smc: pinctrl@2ec820000 {
 			compatible = "apple,t8122-pinctrl", "apple,t8103-pinctrl";
 			reg = <0x2 0xec820000 0x0 0x4000>;