arm64: dts: apple: t8103: Add UART2

This UART is connected to the debug port of the WLAN module. It is
mostly useless, but makes for a good test case for runtime-pm without
having to unbind the console from the main system UART.
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Hector Martin <marcan@marcan.st>

arch/arm64/boot/dts/apple/t8103-jxxx.dtsi

@@ -12,6 +12,7 @@
 / {
 	aliases {
 		serial0 = &serial0;
+		serial2 = &serial2;
 	};
 
 	chosen {
@@ -39,6 +40,10 @@ &serial0 {
 	status = "okay";
 };
 
+&serial2 {
+	status = "okay";
+};
+
 &i2c0 {
 	hpm0: usb-pd@38 {
 		compatible = "apple,cd321x";

arch/arm64/boot/dts/apple/t8103.dtsi

@@ -194,6 +194,18 @@ serial0: serial@235200000 {
 			status = "disabled";
 		};
 
+		serial2: serial@235208000 {
+			compatible = "apple,s5l-uart";
+			reg = <0x2 0x35208000 0x0 0x1000>;
+			reg-io-width = <4>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 607 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk24>, <&clk24>;
+			clock-names = "uart", "clk_uart_baud0";
+			power-domains = <&ps_uart2>;
+			status = "disabled";
+		};
+
 		aic: interrupt-controller@23b100000 {
 			compatible = "apple,t8103-aic", "apple,aic";
 			#interrupt-cells = <3>;