Kernel-3.10.0-957.el7_gpio_atmel

• Atmel GPIO controller (PIO)

Required properties:

• compatible: “atmel,-gpio”, where is at91rm9200 or at91sam9x5.
• reg: Should contain GPIO controller registers location and length
• interrupts: Should be the port interrupt shared by all the pins.
• #gpio-cells: Should be two. The first cell is the pin number and
  the second cell is used to specify optional parameters (currently
  unused).
• gpio-controller: Marks the device node as a GPIO controller.

optional properties:

• #gpio-lines: Number of gpio if absent 32.

Example:
pioA: gpio@fffff200 {
compatible = “atmel,at91rm9200-gpio”;
reg = <0xfffff200 0x100>;
interrupts = <2 4>;
#gpio-cells = <2>;
gpio-controller;
#gpio-lines = <19>;
};