General GPIO

The following code block shows an example of a general GPIO device tree configuration.

&sdio0 {
        clock-frequency = <102400000>;
        max-frequency = <200000000>;
        card-detect-delay = <300>;
        bus-width = <4>;
        broken-cd;
        cap-sd-highspeed;
        post-power-on-delay-ms = <200>;
        cd-gpios = <&gpio 23 0>;
        status = "okay";
};

The input, output and interrupt of a general GPIO are all configured in the DTS configuration file.

In the line cd-gpios = <&gpio 23 0>, make sure you understand the use of the following values:

gpio: The GPIO controller.
23: The GPIO index number.
0: Active level status. 0: low level active; 1: high level active.