[개발노트] [dts] 74hc595 정통 spi모드

&spi4 {

    pinctrl-names = "default";

    pinctrl-0 = <&spi4_pins_mx>;

    status = "okay";

   

    //gpio-mosi = <&gpioe 14 0>;

    //gpio-sck = <&gpioe 12 0>;

    cs-gpios = <&gpioe 11 0>;

    /delete-property/dmas; // 필수.

    /delete-property/dma-names;

    num-chipselects = <1>;

    #address-cells = <1>;

    #size-cells = <0>;

   

    spi_gpio@0{

        compatible = "fairchild,74hc595";

        reg = <0>;

        gpio-controller;

        #gpio-cells = <2>;

        registers-number = <4>;

        spi-max-frequency = <10000000>;

        output-latch-gpio = <&gpioe 11 0>;

        registers-default = /bits/ 8 <0xFF 0xFF 0xFF 0xFF>;

    };

};