Nomadik GPIO controllerRequired properties:- compatible : Should be "st,nomadik-gpio".- reg : Physical base address and length of the controller's registers.- interrupts : The interrupt outputs from the controller.- #gpio-cells : Should be two: The first cell is the pin number. The second cell is used to specify optional parameters: - bits[3:0] trigger type and level flags: 1 = low-to-high edge triggered. 2 = high-to-low edge triggered. 4 = active high level-sensitive. 8 = active low level-sensitive.- gpio-controller : Marks the device node as a GPIO controller.