ramips: add support for Phicomm K2P

It uses one MT7615D radio chip with DBDC mode enabled. This mode allows
this single chip act as an 2x2 11n radio and an 2x2 11ac radio at the
same time. However mt76 doesn't  support it currently so there is no
wireless available.

Specification:
- SoC: MediaTek MT7621AT
- Flash: 16 MB
- RAM: 128 MB
- Ethernet: 1 x WAN (10/100/1000Mbps) and 4 x LAN (10/100/1000 Mbps)
- Wireless radio: MT7615D on PCIE0
- UART: 1 x UART on PCB - 57600 8N1

Issue:
- Wireless radio doesn't work due to the lack of driver.

Flash instruction:
Using UART:
1. Configure PC with a static IP address and setup an TFTP server.
2. Put the firmware into the tftp directory.
3. Connect the UART line as described on the PCB.
4. Power up the device and press 2,then follow the instruction to
   set device and tftp server IP address and input the firmware
   file name.U-boot will then load the firmware and write it into
   the flash.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ramips/base-files/etc/board.d/02_network

@@ -83,6 +83,7 @@ ramips_setup_interfaces()
 	hc5661a|\
 	hc5962|\
 	hlk-rm04|\
+	k2p|\
 	kn|\
 	kn_rc|\
 	mac1200rv2|\

target/linux/ramips/base-files/etc/diag.sh

@@ -157,6 +157,11 @@ get_status_led() {
 	hc5962)
 		status_led="$board:white:status"
 		;;
+	k2p|\
+	m3|\
+	miwifi-nano)
+		status_led="$board:blue:status"
+		;;
 	linkits7688| \
 	linkits7688d)
 		[ "$1" = "upgrade" ] && status_led="mediatek:orange:wifi"
@@ -164,10 +169,6 @@ get_status_led() {
 	m2m)
 		status_led="$board:blue:wifi"
 		;;
-	m3|\
-	miwifi-nano)
-		status_led="$board:blue:status"
-		;;
 	gl-mt300n-v2)
 		status_led="$board:red:wlan"
 		;;

target/linux/ramips/base-files/lib/ramips.sh

@@ -262,6 +262,9 @@ ramips_board_detect() {
 	*"JHR-N926R")
 		name="jhr-n926r"
 		;;
+	*"K2P")
+		name="k2p"
+		;;
 	*"M3")
 		name="m3"
 		;;

target/linux/ramips/base-files/lib/upgrade/platform.sh

@@ -74,6 +74,7 @@ platform_check_image() {
 	jhr-n805r|\
 	jhr-n825r|\
 	jhr-n926r|\
+	k2p|\
 	kn|\
 	kn_rc|\
 	kn_rf|\

target/linux/ramips/dts/K2P.dts

@@ -0,0 +1,119 @@
+/dts-v1/;
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "phicomm,k2p", "mediatek,mt7621-soc";
+	model = "Phicomm K2P";
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		stat_r {
+			label = "k2p:red:status";
+			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+		};
+
+		stat_y {
+			label = "k2p:yellow:status";
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+		};
+
+		stat_b {
+			label = "k2p:blue:status";
+			gpios = <&gpio0 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+		m25p,chunked-io = <32>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x30000>;
+			read-only;
+		};
+
+		partition@30000 {
+			label = "u-boot-env";
+			reg = <0x30000 0x10000>;
+			read-only;
+		};
+
+		factory: partition@40000 {
+			label = "factory";
+			reg = <0x40000 0x10000>;
+			read-only;
+		};
+
+		partition@50000 {
+			label = "permanent_config";
+			reg = <0x50000 0x50000>;
+			read-only;
+		};
+
+		partition@a0000 {
+			label = "firmware";
+			reg = <0xa0000 0xf60000>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+
+	pcie0 {
+		mt76@0,0 {
+			reg = <0x0000 0 0 0 0>;
+			device_type = "pci";
+			mediatek,mtd-eeprom = <&factory 0x0>;
+		};
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0xe000>;
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c", "jtag";
+			ralink,function = "gpio";
+		};
+	};
+};

target/linux/ramips/image/mt7621.mk

@@ -88,6 +88,13 @@ define Device/hc5962
 endef
 TARGET_DEVICES += hc5962
 
+define Device/k2p
+  DTS := K2P
+  IMAGE_SIZE := $(ralink_default_fw_size_16M)
+  DEVICE_TITLE := Phicomm K2P
+endef
+TARGET_DEVICES += k2p
+
 define Device/mt7621
   DTS := MT7621
   BLOCKSIZE := 64k