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1* IBM/AMCC/APM GPIO Controller for PowerPC 4XX series and compatible SoCs2 3All GPIOs are pin-shared with other functions. DCRs control whether a4particular pin that has GPIO capabilities acts as a GPIO or is used for5another purpose. GPIO outputs are separately programmable to emulate6an open-drain driver.7 8Required properties:9 - compatible: must be "ibm,ppc4xx-gpio"10 - reg: address and length of the register set for the device11 - #gpio-cells: must be set to 2. The first cell is the pin number12 and the second cell is used to specify the gpio polarity:13 0 = active high14 1 = active low15 - 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