rockchip: rk3399: Add Rock960 CE board support

Add board support for Rock960 CE board from Vamrs. This board utilizes
common Rock960 family support.

Following peripherals are tested and known to work:
* USB 2.0
* MMC

This commit also adds DDR configuration for LPDDR3-2GiB-1600MHz which
is being used on the board.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/Makefile

@@ -51,6 +51,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += \
 	rk3399-puma-ddr1333.dtb \
 	rk3399-puma-ddr1600.dtb \
 	rk3399-puma-ddr1866.dtb \
+	rk3399-rock960.dtb \
 	rv1108-evb.dtb
 dtb-$(CONFIG_ARCH_MESON) += \
 	meson-gxbb-nanopi-k2.dtb \

arch/arm/dts/rk3399-rock960.dts

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ */
+
+/dts-v1/;
+#include "rk3399-rock960.dtsi"
+#include "rk3399-sdram-lpddr3-2GB-1600.dtsi"
+
+/ {
+	model = "96boards Rock960";
+	compatible = "vamrs,rock960", "rockchip,rk3399";
+
+	chosen {
+		stdout-path = "serial2:1500000n8";
+	};
+};
+
+&pcie0 {
+	ep-gpios = <&gpio2 RK_PA2 GPIO_ACTIVE_HIGH>;
+};
+
+&pinctrl {
+	pcie {
+		pcie_drv: pcie-drv {
+			rockchip,pins =
+				<2 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;
+			};
+	};
+
+	usb2 {
+		host_vbus_drv: host-vbus-drv {
+			rockchip,pins =
+				<4 RK_PD1 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+};
+
+&vcc3v3_pcie {
+	gpio = <&gpio2 5 GPIO_ACTIVE_HIGH>;
+};
+
+&vcc5v0_host {
+	gpio = <&gpio4 25 GPIO_ACTIVE_HIGH>;
+};