rockchip: rk3399: Add Nanopi M4 board support

Add initial support for Nanopi M4 board.

Specification
- Rockchip RK3399
- Dual-Channel 4GB LPDDR3-1866
- SD card slot
- eMMC socket
- RTL8211E 1Gbps
- AP6356S WiFI/BT
- HDMI In/Out, DP, MIPI DSI/CSI
- USB 3.0 x4
- USB Type C power and data
- GPIO1, GPIO2 expansion ports
- DC5V/3A

Commit details of rk3399-nanopi-m4.dts sync from Linux 5.1-rc2:
"arm64: dts: rockchip: Refine nanopi4 differences"
(sha1: c62ffaf5026d0b7633e62b2cea8450b5543c349a)

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/Makefile

@@ -106,6 +106,7 @@ dtb-$(CONFIG_ROCKCHIP_RK3399) += \
 	rk3399-ficus.dtb \
 	rk3399-firefly.dtb \
 	rk3399-gru-bob.dtb \
+	rk3399-nanopi-m4.dtb \
 	rk3399-orangepi.dtb \
 	rk3399-puma-ddr1333.dtb \
 	rk3399-puma-ddr1600.dtb \

arch/arm/dts/rk3399-nanopi-m4-u-boot.dtsi

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include "rk3399-nanopi4-u-boot.dtsi"
+#include "rk3399-sdram-lpddr3-samsung-4GB-1866.dtsi"

arch/arm/dts/rk3399-nanopi-m4.dts

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * FriendlyElec NanoPi M4 board device tree source
+ *
+ * Copyright (c) 2018 FriendlyElec Computer Tech. Co., Ltd.
+ * (http://www.friendlyarm.com)
+ *
+ * Copyright (c) 2018 Collabora Ltd.
+ * Copyright (c) 2019 Arm Ltd.
+ */
+
+/dts-v1/;
+#include "rk3399-nanopi4.dtsi"
+
+/ {
+	model = "FriendlyElec NanoPi M4";
+	compatible = "friendlyarm,nanopi-m4", "rockchip,rk3399";
+
+	vdd_5v: vdd-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_5v";
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
+	vcc5v0_core: vcc5v0-core {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_core";
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vdd_5v>;
+	};
+
+	vcc5v0_usb1: vcc5v0-usb1 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_usb1";
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	vcc5v0_usb2: vcc5v0-usb2 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_usb2";
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vcc5v0_sys>;
+	};
+};
+
+&vcc3v3_sys {
+	vin-supply = <&vcc5v0_core>;
+};
+
+&u2phy0_host {
+	phy-supply = <&vcc5v0_usb1>;
+};
+
+&u2phy1_host {
+	phy-supply = <&vcc5v0_usb2>;
+};
+
+&vbus_typec {
+	regulator-always-on;
+	vin-supply = <&vdd_5v>;
+};

arch/arm/dts/rk3399-nanopi4-u-boot.dtsi

@@ -3,6 +3,8 @@
  * Copyright (C) 2019 Jagan Teki <jagan@amarulasolutions.com>
  */
 
+#include "rk3399-u-boot.dtsi"
+
 &sdmmc {
 	pinctrl-0 = <&sdmmc_bus4 &sdmmc_clk &sdmmc_cmd &sdmmc_cd>;
 };