arm64: dts: rockchip: add a standalone version of the rk3399 sapphire

While the sapphire board is a system-on-module and mostly used with the
excavator baseboard, it is also possible to use it standalone without
any base. So add a board-variant for this type.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Vicente Bergas <vicencb@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/rockchip.txt

@@ -185,6 +185,10 @@ Rockchip platforms device tree bindings
     Required root node properties:
       - compatible = "rockchip,rk3399-evb", "rockchip,rk3399";
 
+- Rockchip RK3399 Sapphire board standalone:
+    Required root node properties:
+      - compatible = "rockchip,rk3399-sapphire", "rockchip,rk3399";
+
 - Rockchip RK3399 Sapphire Excavator board:
     Required root node properties:
       - compatible = "rockchip,rk3399-sapphire-excavator", "rockchip,rk3399";

arch/arm64/boot/dts/rockchip/Makefile

@@ -12,4 +12,5 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-evb.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-firefly.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-gru-kevin.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-puma-haikou.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-sapphire.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-sapphire-excavator.dtb

arch/arm64/boot/dts/rockchip/rk3399-sapphire.dts

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2018 Fuzhou Rockchip Electronics Co., Ltd.
+ */
+
+/dts-v1/;
+#include "rk3399-sapphire.dtsi"
+
+/ {
+	model = "Sapphire-RK3399 Board";
+	compatible = "rockchip,rk3399-sapphire", "rockchip,rk3399";
+};