arm64: dts: renesas: r8a779a0: Add CANFD device node

This patch adds a CANFD device node for r8a779a0.

Based on patch by Kazuya Mizuguchi.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20220309162609.3726306-3-uli+renesas@fpond.eu
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a779a0.dtsi

@@ -24,6 +24,13 @@
 		i2c6 = &i2c6;
 	};
 
+	/* External CAN clock - to be overridden by boards that provide it */
+	can_clk: can {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <0>;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -596,6 +603,55 @@
 			status = "disabled";
 		};
 
+		canfd: can@e6660000 {
+			compatible = "renesas,r8a779a0-canfd";
+			reg = <0 0xe6660000 0 0x8000>;
+			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>,
+					<GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "ch_int", "g_int";
+			clocks = <&cpg CPG_MOD 328>,
+				 <&cpg CPG_CORE R8A779A0_CLK_CANFD>,
+				 <&can_clk>;
+			clock-names = "fck", "canfd", "can_clk";
+			assigned-clocks = <&cpg CPG_CORE R8A779A0_CLK_CANFD>;
+			assigned-clock-rates = <80000000>;
+			power-domains = <&sysc R8A779A0_PD_ALWAYS_ON>;
+			resets = <&cpg 328>;
+			status = "disabled";
+
+			channel0 {
+				status = "disabled";
+			};
+
+			channel1 {
+				status = "disabled";
+			};
+
+			channel2 {
+				status = "disabled";
+			};
+
+			channel3 {
+				status = "disabled";
+			};
+
+			channel4 {
+				status = "disabled";
+			};
+
+			channel5 {
+				status = "disabled";
+			};
+
+			channel6 {
+				status = "disabled";
+			};
+
+			channel7 {
+				status = "disabled";
+			};
+		};
+
 		avb0: ethernet@e6800000 {
 			compatible = "renesas,etheravb-r8a779a0",
 				     "renesas,etheravb-rcar-gen3";