arm64: dts: renesas: Add Renesas Ebisu board support

Basic support for the Renesas Ebisu board based on R-Car E3:
  - Memory,
  - Main crystal,
  - Serial console,
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[shimoda: rebase and add SPDX-License-Identifier]
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/Makefile

@@ -10,4 +10,5 @@ dtb-$(CONFIG_ARCH_R8A7796) += r8a7796-salvator-xs.dtb
 dtb-$(CONFIG_ARCH_R8A77965) += r8a77965-salvator-x.dtb r8a77965-salvator-xs.dtb
 dtb-$(CONFIG_ARCH_R8A77970) += r8a77970-eagle.dtb r8a77970-v3msk.dtb
 dtb-$(CONFIG_ARCH_R8A77980) += r8a77980-condor.dtb
+dtb-$(CONFIG_ARCH_R8A77990) += r8a77990-ebisu.dtb
 dtb-$(CONFIG_ARCH_R8A77995) += r8a77995-draak.dtb

arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Device Tree Source for the ebisu board
+ *
+ * Copyright (C) 2018 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+#include "r8a77990.dtsi"
+
+/ {
+	model = "Renesas Ebisu board based on r8a77990";
+	compatible = "renesas,ebisu", "renesas,r8a77990";
+
+	aliases {
+		serial0 = &scif2;
+	};
+
+	chosen {
+		bootargs = "ignore_loglevel";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@48000000 {
+		device_type = "memory";
+		/* first 128MB is reserved for secure area. */
+		reg = <0x0 0x48000000 0x0 0x38000000>;
+	};
+};
+
+&extal_clk {
+	clock-frequency = <48000000>;
+};
+
+&scif2 {
+	status = "okay";
+};