Kernel-4.18.0-80.el8_gpio-74x164

• Generic 8-bits shift register GPIO driver

Required properties:

• compatible: Should contain one of the following:
  “fairchild,74hc595”
  “nxp,74lvc594”
• reg : chip select number
• gpio-controller : Marks the device node as a gpio controller.
• #gpio-cells : Should be two. The first cell is the pin number and
  the second cell is used to specify the gpio polarity:

  0 = active high
  1 = active low
  

• registers-number: Number of daisy-chained shift registers

Optional properties:

• enable-gpios: GPIO connected to the OE (Output Enable) pin.

Example:

gpio5: gpio5@0 {
compatible = “fairchild,74hc595”;
reg = <0>;
gpio-controller;
#gpio-cells = <2>;
registers-number = <4>;
spi-max-frequency = <100000>;
};