1 * IBM/AMCC/APM GPIO Controller for PowerPC 4XX series and compatible SoCs
2
3 All GPIOs are pin-shared with other functions. DCRs control whether a
4 particular pin that has GPIO capabilities acts as a GPIO or is used for
5 another purpose. GPIO outputs are separately programmable to emulate
6 an open-drain driver.
7
8 Required 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
17 Example:
18
19 GPIO0: gpio@ef600b00 {
20 compatible = "ibm,ppc4xx-gpio";
21 reg = <0xef600b00 0x00000048>;
22 #gpio-cells = <2>;
23 gpio-controller;
24 };
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