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