arm64: dts: renesas: Add support for Salvator-XS with R-Car M3-N

Add initial support for the Renesas Salvator-XS (Salvator-X 2nd version)
development board equipped with an R-Car M3-N SiP.

Most features are enabled through the shared salvator-xs.dtsi board
description.  The memory configuration is specific to the M3-N SiP.
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[geert: Switch to SPDX-License-Identifier, update patch description]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/Makefile

@@ -7,7 +7,7 @@ dtb-$(CONFIG_ARCH_R8A7795) += r8a7795-es1-h3ulcb-kf.dtb
 dtb-$(CONFIG_ARCH_R8A7796) += r8a7796-salvator-x.dtb r8a7796-m3ulcb.dtb
 dtb-$(CONFIG_ARCH_R8A7796) += r8a7796-m3ulcb-kf.dtb
 dtb-$(CONFIG_ARCH_R8A7796) += r8a7796-salvator-xs.dtb
-dtb-$(CONFIG_ARCH_R8A77965) += r8a77965-salvator-x.dtb
+dtb-$(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_R8A77995) += r8a77995-draak.dtb

arch/arm64/boot/dts/renesas/r8a77965-salvator-xs.dts

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Source for the Salvator-X 2nd version board
+ *
+ * Copyright (C) 2017 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+#include "r8a77965.dtsi"
+#include "salvator-xs.dtsi"
+
+/ {
+	model = "Renesas Salvator-X 2nd version board based on r8a77965";
+	compatible = "renesas,salvator-xs", "renesas,r8a77965";
+
+	memory@48000000 {
+		device_type = "memory";
+		/* first 128MB is reserved for secure area. */
+		reg = <0x0 0x48000000 0x0 0x78000000>;
+	};
+};