1* Generic 8-bits shift register GPIO driver 2 3Required properties: 4- compatible: Should contain one of the following: 5 "fairchild,74hc595" 6 "nxp,74lvc594" 7- reg : chip select number 8- gpio-controller : Marks the device node as a gpio controller. 9- #gpio-cells : Should be two. The first cell is the pin number and 10 the second cell is used to specify the gpio polarity: 11 0 = active high 12 1 = active low 13- registers-number: Number of daisy-chained shift registers 14 15Example: 16 17gpio5: gpio5@0 { 18 compatible = "fairchild,74hc595"; 19 reg = <0>; 20 gpio-controller; 21 #gpio-cells = <2>; 22 registers-number = <4>; 23 spi-max-frequency = <100000>; 24}; 25