ramips: add support for HILINK HLK-7628N

Specification:

CPU:       MT7628 580 MHz. MIPS 24K
RAM:       128 MB
Flash:     32 MB
WIFI:      802.11n/g/b 20/40 MHz
Ethernet:  5 Port ethernet switch
UART:      2x

Flash instruction:
The U-boot is based on Ralink SDK so we can flash the firmware 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 UART0 line as described on the PCB.
4. Power up the device and press 2, 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.
5. After firmware is started connect via ethernet at 192.168.1.1

Signed-off-by: Liu Yu <f78fk@live.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [removed dupped subject]

4 files changed, 109 insertions, 0 deletions

diff --git a/target/linux/ramips/base-files/etc/board.d/01_leds b/target/linux/ramips/base-files/etc/board.d/01_leds
index b55ca0413e..ccbe53d770 100755
--- a/target/linux/ramips/base-files/etc/board.d/01_leds
+++ b/target/linux/ramips/base-files/etc/board.d/01_leds
@@ -17,6 +17,7 @@ case $board in
 	set_wifi_led "$boardname:amber:wlan"
 	;;
 3g-6200nl|\
+hilink,hlk-7628n|\
 skylab,skw92a|\
 wnce2001)
 	set_wifi_led "$boardname:green:wlan"
diff --git a/target/linux/ramips/base-files/etc/board.d/02_network b/target/linux/ramips/base-files/etc/board.d/02_network
index 2e56678cf5..9c9517a7f3 100755
--- a/target/linux/ramips/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/base-files/etc/board.d/02_network
@@ -220,6 +220,7 @@ ramips_setup_interfaces()
 	gl-mt300a|\
 	gl-mt300n|\
 	gl-mt750|\
+	hilink,hlk-7628n|\
 	hiwifi,hc5861b|\
 	jhr-n805r|\
 	jhr-n825r|\
@@ -498,6 +499,7 @@ ramips_setup_macs()
 	dir-620-a1|\
 	esr-9753|\
 	freestation5|\
+	hilink,hlk-7628n|\
 	hlk-rm04|\
 	mpr-a1|\
 	psr-680w|\
diff --git a/target/linux/ramips/dts/HLK-7628N.dts b/target/linux/ramips/dts/HLK-7628N.dts
new file mode 100644
index 0000000000..71c6b60ac2
--- /dev/null
+++ b/target/linux/ramips/dts/HLK-7628N.dts
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "mt7628an.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "hilink,hlk-7628n", "mediatek,mt7628an-soc";
+	model = "HILINK HLK-7628N";
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wlan {
+			label = "hlk-7628n:green:wlan";
+			gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&uart1 {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			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 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0x1fb0000>;
+			};
+		};
+	};
+};
+
+&wmac {
+	status = "okay";
+};
+
diff --git a/target/linux/ramips/image/mt76x8.mk b/target/linux/ramips/image/mt76x8.mk
index ba3354a8a6..0fd72a4117 100644
--- a/target/linux/ramips/image/mt76x8.mk
+++ b/target/linux/ramips/image/mt76x8.mk
@@ -81,6 +81,13 @@ define Device/hc5661a
 endef
 TARGET_DEVICES += hc5661a
 
+define Device/hilink_hlk-7628n
+  DTS := HLK-7628N
+  IMAGE_SIZE := $(ralink_default_fw_size_32M)
+  DEVICE_TITLE := HILINK HLK7628N
+endef
+TARGET_DEVICES += hilink_hlk-7628n
+
 define Device/hiwifi_hc5861b
   DTS := HC5861B
   IMAGE_SIZE := 15808k