rv1126EVB板的设备树

rv1126EVB是一款基于瑞芯微rv1126芯片的开发板，设备树文件一般位于 `/arch/arm64/boot/dts/rockchip/` 目录下，名为 `rockchip-rv1126-evb.dts`。

以下是该设备树文件的部分内容：

/ {
    model = "Rockchip RV1126 EVB Board";
    compatible = "rockchip,rv1126-evb", "rockchip,rv1126", "rockchip,rk1808";

    chosen {
        bootargs = "root=/dev/mmcblk1p2 rw rootwait console=ttyS2,1500000n8 earlycon=uart8250,mmio32,0xff1a0000 swiotlb=1 coherent_pool=1m cgroup_enable=memory swapaccount=1 panic=10 consoleblank=0";
        stdout-path = "serial@ff1a0000:1500000";
    };

    memory@80000000 {
        device_type = "memory";
        reg = <0x0 0x80000000 0x0 0x80000000>;
    };

    chosen {
        bootargs = "console=ttyS2,1500000n8 earlycon=uart8250,mmio32,0xff1a0000 swiotlb=1 coherent_pool=1m cgroup_enable=memory swapaccount=1 panic=10 consoleblank=0";
    };
    
    uart2: serial@ff1a0000 {
        status = "okay";
    };
    
    mmcblk1: mmc@fe320000 {
        status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&sdmmc1_pins_a>;
        bus-width = <4>;
        vmmc-supply = <&vcc_io>;
        vqmmc-supply = <&vcc_sd>;
        cd-gpios = <&gpio4 0 GPIO_ACTIVE_LOW>;
        wp-gpios = <&gpio4 1 GPIO_ACTIVE_LOW>;
        max-frequency = <150000000>;
        cap-sd-highspeed;
        cap-mmc-highspeed;
        disable-wp;
        assigned-clocks = <&cru SCLK_EMMC>;
        assigned-clock-rates = <200000000>;
        status = "okay";
    };
    
    sound {
        compatible = "simple-audio-card";
        simple-audio-card,format = "i2s";
        simple-audio-card,name = "rv1126-evb";
        simple-audio-card,bitclock-master = <&i2s1>;
        simple-audio-card,frame-master = <&i2s1>;
        
        i2s1: i2s-controller@ff140000 {
            compatible = "rockchip,rv1126-i2s";
            reg = <0x0 0xff140000 0x0 0x1000>;
            rockchip,grf = <&syscon>;
            rockchip,audio-codec = <&wm8960>;

            #sound-dai-cells = <0>;
            #sound-dai-cpu = <&cpu_dai>;
            #sound-dai-codec = <&codec_dai>;
        };
        
        cpu_dai: simple-audio-card,cpu {
            sound-dai-name = "rv1126-i2s-hifi";
            sound-dai-codec = <&codec_dai>;
            sound-dai-tdm-slot-num = <2>;
            sound-dai-tdm-slot-width = <16>;
            sound-dai-tdm-slot-offset = <0>;
            sound-dai-tdm-slot-out = <1>;
        };
        
        codec_dai: simple-audio-card,codec {
            sound-dai-name = "wm8960-hifi";
            sound-dai-tdm-slot-num = <2>;
            sound-dai-tdm-slot-width = <16>;
            sound-dai-tdm-slot-offset = <0>;
            sound-dai-tdm-slot-in = <1>;
        };

        wm8960: codec {
            compatible = "wlf,wm8960";
            reg = <0x1a>;
            reset-gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_LOW>;
            clocking = "mclk";
            #sound-dai-cells = <0>;
            #sound-dai-codec = <&codec_dai>;
            #sound-dai-tdm-slot-num = <2>;
            #sound-dai-tdm-slot-width = <16>;
            #sound-dai-tdm-slot-offset = <0>;
            #sound-dai-tdm-slot-in = <1>;
            #sound-dai-tdm-slot-out = <1>;
            #sound-dai-bitclock-inversion;
            #sound-dai-frame-inversion;
        };
    };
    
    gpio-keys {
        compatible = "gpio-keys";
        #address-cells = <1>;
        #size-cells = <0>;
        autorepeat;
        button@1 {
            label = "gpio_key1";
            gpios = <&gpio4 2 GPIO_ACTIVE_LOW>;
            linux,code = <116>;
            debounce-interval = <30>;
            wakeup-source;
        };
        button@2 {
            label = "gpio_key2";
            gpios = <&gpio4 3 GPIO_ACTIVE_LOW>;
            linux,code = <115>;
            debounce-interval = <30>;
            wakeup-source;
        };
    };
};

该设备树文件包含了关于该开发板上的各种硬件设备的信息和配置，如串口、MMC、I2S音频、GPIO按键等。