Documentation/devicetree/bindings/gpio/gpio-74x164.txt

   1 * Generic 8-bits shift register GPIO driver
   2
   3 Required properties:
   4 - compatible : Should be "fairchild,74hc595"
   5 - reg : chip select number
   6 - gpio-controller : Marks the device node as a gpio controller.
   7 - #gpio-cells : Should be two.  The first cell is the pin number and
   8   the second cell is used to specify the gpio polarity:
   9       0 = active high
  10       1 = active low
  11 - registers-number: Number of daisy-chained shift registers
  12
  13 Example:
  14
  15 gpio5: gpio5@0 {
  16         compatible = "fairchild,74hc595";
  17         reg = <0>;
  18         gpio-controller;
  19         #gpio-cells = <2>;
  20         registers-number = <4>;
  21         spi-max-frequency = <100000>;
  22 };