How to add a linux kernel device nodes for extended gpio chip driver?

1. attention attribute gpio-hog

 　　GPIO hogging is a mechanism providing automatic GPIO request and configuration as part of the gpio-controller's driver probe function. (Gpio-hog to provide an automatic gpio resource request and configured to control the driving mechanism portion of the probe function gpio)

2. Examples

    pca9554:pca9554@20 {
　　compatible = "nxp,pca9554";

　　reg=<0x20>;

　   gpio-controller;

　　#gpio-cells=<2>;

　　interrupt-controller;

　　#interrupt-cells = <2>;

　　interrupt-parent = <&gpio3>;

　　interrupts = <28 IRQ_TYPE_NONE>;

      P00 {

　　　　GPIO hog;

　　　　gpios = <0 GPIO_ACTIVE_LOW>;
　　　　output-high;
　　　　line-name = "led_normal";

　　}

    }

3. How to cite pca9554 node?

　　displayport {

        dp.aux_sw_oe = <&pca9554 4 GPIO_ACTIVE_HIGH>

        dp.sbu_sw_sel = <&pca9554 1 GPIO_ACTIVE_HIGH>

    };