MOXA ART GPIO Controller Required properties: - #gpio-cells : Should be 2, The first cell is the pin number, the second cell is used to specify polarity: 0 = active high 1 = active low - compatible : Must be "moxa,moxart-gpio" - reg : Should contain registers location and length Example: gpio: gpio@98700000 { gpio-controller; #gpio-cells = <2>; compatible = "moxa,moxart-gpio"; reg = <0x98700000 0xC>; };