OpenWRT Support

To get started, see OpenWRT Development at first.

Add DTS file

Copy the following contents to file target/linux/ramips/dts/CW-IOT-7621-D1.dts.

// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
/dts-v1/;

#include "mt7621.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
    compatible = "iot-7621-d1", "mediatek,mt7621-soc";
    model = "CW-IOT-7621-D1";

    aliases {
        led-boot = &led_power;
        led-failsafe = &led_power;
        led-running = &led_power;
        led-upgrade = &led_power;
    };

    chosen {
        bootargs = "console=ttyS0,115200";
    };

    leds {
        compatible = "gpio-leds";

        led_power: power {
            label = "sx-7621:blue:power";
            gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;
            default-state = "on";
        };
        sys {
            label = "sys";
            gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
            default-state = "on";
        };
        usb {
            label = "usb";
            gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
            default-state = "off";
        };
        minipcie {
            label = "minipcie";
            gpios = <&gpio0 23 GPIO_ACTIVE_LOW>;
            default-state = "off";
        };
        pcie {
            label = "pcie";
            gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;
            default-state = "on";
        };
        rs232 {
            label = "rs232";
            gpios = <&gpio0 24 GPIO_ACTIVE_LOW>;
            default-state = "off";
        };
        rs4850 {
            label = "rs4850";
            gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;
            default-state = "off";
        };
        rs4851 {
            label = "rs4851";
            gpios = <&gpio0 26 GPIO_ACTIVE_LOW>;
            default-state = "off";
        };
    };

    keys {
        compatible = "gpio-keys-polled";
        poll-interval = <20>;

        reset {
            label = "reset";
            gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
            linux,code = <KEY_RESTART>;
        };

    };
    gpio_export {
        compatible = "gpio-export";
        #size-cells = <0>;

        4gwan {
            gpio-export,name = "4gwan";
            gpio-export,output = <0>;
            gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
        };
        minipcie {
            gpio-export,name = "minipcie";
            gpio-export,output = <0>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 27 GPIO_ACTIVE_LOW>;
        };
        minipcieled {
            gpio-export,name = "minipcieled";
            gpio-export,output = <0>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 23 GPIO_ACTIVE_LOW>;
        };
        pcieled {
            gpio-export,name = "pcieled";
            gpio-export,output = <1>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;
        };
        sys {
            gpio-export,name = "sys";
            gpio-export,output = <0>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
        };
        rs232 {
            gpio-export,name = "rs232";
            gpio-export,output = <1>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 24 GPIO_ACTIVE_LOW>;
        };
        rs4850 {
            gpio-export,name = "rs4850";
            gpio-export,output = <1>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;
        };
        rs4851 {
            gpio-export,name = "rs4851";
            gpio-export,output = <1>;
            gpio-export,direction_may_change = <1>;
            gpios = <&gpio0 26 GPIO_ACTIVE_LOW>;
        };
    };

    watchdog {
        compatible = "linux,wdt-gpio";
        gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
        hw_algo = "toggle";
        hw_margin_ms = <300>;
        always-running;
    };

};

&sdhci {
    status = "okay";
};

&xhci {
    status = "okay";
};

&uartlite2 {
    status = "okay";
};

&uartlite3 {
    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>;
            };

            partition@50000 {
                compatible = "denx,uimage";
                label = "firmware";
                reg = <0x50000 0xfb0000>;
            };
        };
    };
};

&pcie {
    status = "okay";
};

&pcie0 {
    wifi@0,0 {
        compatible = "pci14c3,7603";
        reg = <0x0000 0 0 0 0>;
        mediatek,mtd-eeprom = <&factory 0x0000>;
        ieee80211-freq-limit = <2400000 2500000>;
        led {
            led-active-low;
        };
    };
};

&pcie1 {
    wifi@0,0 {
        compatible = "pci14c3,7662";
        reg = <0x0000 0 0 0 0>;
        mediatek,mtd-eeprom = <&factory 0x8000>;
        ieee80211-freq-limit = <5000000 6000000>;
        led {
            led-sources = <2>;
            led-active-low;
        };
    };
};

&ethernet {
    mtd-mac-address = <&factory 0x4>;
};

&pinctrl {
    state_default: pinctrl0 {
        gpio {
            ralink,group = "jtag", "wdt";
            ralink,function = "gpio";
        };
    };
};

Add Device

Add device definition in target/linux/ramips/image/mt7621.mk

define Device/iot-7621-d1
  DTS := CW-IOT-7621-D1
  IMAGE_SIZE := $(ralink_default_fw_size_32M)
  DEVICE_TITLE := COMBWAY CW-IOT-7621-D1
  DEVICE_PACKAGES := kmod-usb2 kmod-usb-ohci
endef
TARGET_DEVICES += iot-7621-d1

Add default Network

Add a branch in function ramips_setup_interfaces in target/linux/ramips/base-files/etc/board.d/02_network

  iot-7621-d1)
      ucidef_add_switch "switch0" \
        "1:lan:4" "2:lan:3" "3:lan:2" "0:lan:1" "4:wan" "6@eth0"
    ;;