arm64: dts: r8a7796: Add CAN FD support

Adds CAN FD controller node for r8a7796.

Based on a patch for r8a7795 by Ramesh Shanmugasundaram.
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7796.dtsi

@@ -397,6 +397,30 @@ can1: can@e6c38000 {
 			status = "disabled";
 		};
 
+		canfd: can@e66c0000 {
+			compatible = "renesas,r8a7796-canfd",
+				     "renesas,rcar-gen3-canfd";
+			reg = <0 0xe66c0000 0 0x8000>;
+			interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>,
+				   <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 914>,
+			       <&cpg CPG_CORE R8A7796_CLK_CANFD>,
+			       <&can_clk>;
+			clock-names = "fck", "canfd", "can_clk";
+			assigned-clocks = <&cpg CPG_CORE R8A7796_CLK_CANFD>;
+			assigned-clock-rates = <40000000>;
+			power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+			status = "disabled";
+
+			channel0 {
+				status = "disabled";
+			};
+
+			channel1 {
+				status = "disabled";
+			};
+		};
+
 		scif2: serial@e6e88000 {
 			compatible = "renesas,scif-r8a7796",
 				     "renesas,rcar-gen3-scif", "renesas,scif";