ARM: dts: sunxi: a83t: Add msgbox node

The A83T SoC contains a message box that can be used to send messages
and interrupts back and forth between the ARM application CPUs and the
ARISC coprocessor. Add a device tree node for it.
Tested-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm/boot/dts/sun8i-a83t.dtsi

@@ -610,6 +610,16 @@ crypto: crypto@1c15000 {
 			clock-names = "bus", "mod";
 		};
 
+		msgbox: mailbox@1c17000 {
+			compatible = "allwinner,sun8i-a83t-msgbox",
+				     "allwinner,sun6i-a31-msgbox";
+			reg = <0x01c17000 0x1000>;
+			clocks = <&ccu CLK_BUS_MSGBOX>;
+			resets = <&ccu RST_BUS_MSGBOX>;
+			interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
+			#mbox-cells = <1>;
+		};
+
 		usb_otg: usb@1c19000 {
 			compatible = "allwinner,sun8i-a83t-musb",
 				     "allwinner,sun8i-a33-musb";