ARM: dts: rockchip: Add Radxa Rock Pi N8 initial support

Rock Pi N8 is a Rockchip RK3288 based SBC, which has
- VMARC RK3288 SOM (as per SMARC standard) from Vamrs.
- Compatible carrier board from Radxa.

VAMRC RK3288 SOM need to mount on top of radxa dalang
carrier board for making Rock Pi N8 SBC.

So, add initial support for Rock Pi N8 by including rk3288,
rk3288 vamrc-som and raxda dalang carrier board dtsi files.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3288-rock-pi-n8-u-boot.dtsi b/arch/arm/dts/rk3288-rock-pi-n8-u-boot.dtsi
new file mode 100644
index 0000000..e9d7404
--- /dev/null
+++ b/arch/arm/dts/rk3288-rock-pi-n8-u-boot.dtsi
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include "rk3288-u-boot.dtsi"
+
+&dmc {
+	rockchip,pctl-timing = <0x215 0xc8 0x0 0x35 0x26 0x2 0x70 0x2000d
+		0x6 0x0 0x8 0x4 0x17 0x24 0xd 0x6
+		0x4 0x8 0x4 0x76 0x4 0x0 0x30 0x0
+		0x1 0x2 0x2 0x4 0x0 0x0 0xc0 0x4
+		0x8 0x1f4>;
+	rockchip,phy-timing = <0x48d7dd93 0x187008d8 0x121076
+		0x0 0xc3 0x6 0x2>;
+	rockchip,sdram-params = <0x20d266a4 0x5b6 2 533000000 6 9 0>;
+};
+
+&sdmmc {
+	u-boot,dm-pre-reloc;
+};
+
+&emmc {
+	u-boot,dm-pre-reloc;
+};
+
+&uart2 {
+	u-boot,dm-pre-reloc;
+};
+
+&pinctrl {
+	u-boot,dm-pre-reloc;
+};