1* Generic 8-bits shift register GPIO driver
2
3Required 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
13Example:
14
15gpio5: 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};
23