1Cirrus Logic CLPS711X GPIO controller 2 3Required properties: 4- compatible: Should be "cirrus,ep7209-gpio" 5- reg: Physical base GPIO controller registers location and length. 6 There should be two registers, first is DATA register, the second 7 is DIRECTION. 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 14Note: Each GPIO port should have an alias correctly numbered in "aliases" 15node. 16 17Example: 18 19aliases { 20 gpio0 = &porta; 21}; 22 23porta: gpio@80000000 { 24 compatible = "cirrus,ep7312-gpio","cirrus,ep7209-gpio"; 25 reg = <0x80000000 0x1>, <0x80000040 0x1>; 26 gpio-controller; 27 #gpio-cells = <2>; 28}; 29