arm64: dts: renesas: r8a774e1: Add RWDT node

Add a device node for the Watchdog Timer (RWDT) controller on the Renesas
RZ/G2H (r8a774e1) SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Link: https://lore.kernel.org/r/1594811350-14066-18-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a774e1.dtsi

@@ -290,10 +290,14 @@
 		ranges;
 
 		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a774e1-wdt",
+				     "renesas,rcar-gen3-wdt";
 			reg = <0 0xe6020000 0 0x0c>;
+			interrupts = <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc R8A774E1_PD_ALWAYS_ON>;
+			resets = <&cpg 402>;
 			status = "disabled";
-
-			/* placeholder */
 		};
 
 		gpio0: gpio@e6050000 {