1* IBM/AMCC/APM GPIO Controller for PowerPC 4XX series and compatible SoCs 2 3All GPIOs are pin-shared with other functions. DCRs control whether a 4particular pin that has GPIO capabilities acts as a GPIO or is used for 5another purpose. GPIO outputs are separately programmable to emulate 6an open-drain driver. 7 8Required properties: 9 - compatible: must be "ibm,ppc4xx-gpio" 10 - reg: address and length of the register set for the device 11 - #gpio-cells: must be set to 2. The first cell is the pin number 12 and the second cell is used to specify the gpio polarity: 13 0 = active high 14 1 = active low 15 - gpio-controller: marks the device node as a gpio controller. 16 17Example: 18 19GPIO0: gpio@ef600b00 { 20 compatible = "ibm,ppc4xx-gpio"; 21 reg = <0xef600b00 0x00000048>; 22 #gpio-cells = <2>; 23 gpio-controller; 24}; 25