ramips: add support for Xiaomi Mi Router 4C

This commit adds support for Xiaomi's Mi Router 4C device.

Specifications:

- CPU: MediaTek MT7628AN (580MHz)
- Flash: 16MB
- RAM: 64MB DDR2
- 2.4 GHz: IEEE 802.11b/g/n with Integrated LNA and PA
- Antennas: 4x external single band antennas
- WAN: 1x 10/100M
- LAN: 2x 10/100M
- LEDs: 2x yellow/blue. Programmable (labelled as power on case)
                      - Non-programmable (shows WAN activity)
- Button: Reset

How to install:

1- Use OpenWRTInvasion to gain telnet and ftp access.
2- Push openwrt firmware to /tmp/ using ftp.
3- Connect to router using telnet. (IP: 192.168.31.1 -
   Username: root - No password)
4- Use command "mtd -r write /tmp/firmware.bin OS1" to flash into
   the router..
5- It takes around 2 minutes. After that router will restart itself
   to OpenWrt.

Signed-off-by: Ataberk Özen <ataberkozen123@gmail.com>
[wrap commit message, bump PKG_RELEASE for uboot-envtools, remove
dts-v1 from DTS, fix LED labels]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

4 files changed, 147 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7628an_xiaomi_mi-router-4c.dts b/target/linux/ramips/dts/mt7628an_xiaomi_mi-router-4c.dts
new file mode 100644
index 0000000000..a6445c8717
--- /dev/null
+++ b/target/linux/ramips/dts/mt7628an_xiaomi_mi-router-4c.dts
@@ -0,0 +1,133 @@
+//SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7628an.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "xiaomi,mi-router-4c", "mediatek,mt7628an-soc";
+	model = "Xiaomi Mi Router 4C";
+
+	aliases {
+		led-boot = &led_power_yellow;
+		led-failsafe = &led_power_yellow;
+		led-running = &led_power_blue;
+		led-upgrade = &led_power_yellow;
+		label-mac-device = &ethernet;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power_blue: power_blue {
+			label = "blue:power";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_yellow: power_yellow {
+			label = "yellow:power";
+			gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 38 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "gpio", "wdt", "wled_an";
+		function = "gpio";
+	};
+};
+
+&ehci {
+	status = "disabled";
+};
+
+&ohci {
+	status = "disabled";
+};
+
+&esw {
+	mediatek,portmap = <0x3d>;
+	mediatek,portdisable = <0x29>;
+};
+
+&wmac {
+	status = "okay";
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x28>;
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "bootloader";
+				reg = <0x0 0x20000>;
+				read-only;
+			};
+
+			partition@20000 {
+				label = "config";
+				reg = <0x20000 0x10000>;
+				read-only;
+			};
+
+			factory: partition@30000 {
+				label = "factory";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "crash";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				label = "cfg_bak";
+				reg = <0x50000 0x10000>;
+				read-only;
+			};
+
+			partition@60000 {
+				label = "overlay";
+				reg = <0x60000 0x100000>;
+				read-only;
+			};
+
+			partition@160000 {
+				label = "firmware";
+				reg = <0x160000 0xea0000>;
+				compatible = "denx,uimage";
+			};
+		};
+	};
+};
diff --git a/target/linux/ramips/image/mt76x8.mk b/target/linux/ramips/image/mt76x8.mk
index 72539f7a14..edd42a4dd5 100644
--- a/target/linux/ramips/image/mt76x8.mk
+++ b/target/linux/ramips/image/mt76x8.mk
@@ -752,6 +752,14 @@ define Device/xiaomi_mir4a-100m
 endef
 TARGET_DEVICES += xiaomi_mir4a-100m
 
+define Device/xiaomi_mi-router-4c
+  IMAGE_SIZE := 14976k
+  DEVICE_VENDOR := Xiaomi
+  DEVICE_MODEL := Mi Router 4C
+  DEVICE_PACKAGES := uboot-envtools
+endef
+TARGET_DEVICES += xiaomi_mi-router-4c
+
 define Device/xiaomi_miwifi-nano
   IMAGE_SIZE := 16064k
   DEVICE_VENDOR := Xiaomi
diff --git a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
index f4e3fcacb5..6f0078c70a 100755
--- a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
@@ -137,6 +137,10 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"4:lan:1" "2:lan:2" "0:wan" "6@eth0"
 		;;
+	xiaomi,mi-router-4c)
+		ucidef_add_switch "switch0" \
+			"4:lan:1" "2:lan:2" "1:wan" "6@eth0"
+		;;
 	xiaomi,miwifi-nano)
 		ucidef_add_switch "switch0" \
 			"0:lan:2" "2:lan:1" "4:wan" "6@eth0"
@@ -234,6 +238,7 @@ ramips_setup_macs()
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		wan_mac=$(mtd_get_mac_binary factory 0x28)
 		;;
+	xiaomi,mi-router-4c|\
 	xiaomi,mir4a-100m)
 		wan_mac=$(mtd_get_mac_binary factory 0x4)
 		;;
diff --git a/target/linux/ramips/mt76x8/base-files/etc/init.d/bootcount b/target/linux/ramips/mt76x8/base-files/etc/init.d/bootcount
index 3c21433cc5..23f1e71b41 100755
--- a/target/linux/ramips/mt76x8/base-files/etc/init.d/bootcount
+++ b/target/linux/ramips/mt76x8/base-files/etc/init.d/bootcount
@@ -8,6 +8,7 @@ boot() {
 		[ -n "$(fw_printenv bootcount bootchanged 2>/dev/null)" ] &&\
 			echo -e "bootcount\nbootchanged\n" | /usr/sbin/fw_setenv -s -
 		;;
+	xiaomi,mi-router-4c|\
 	xiaomi,miwifi-nano)
 		fw_setenv flag_boot_success 1
 		;;