1Avionic Design N-bit GPIO expander bindings 2 3Required properties: 4- compatible: should be "ad,gpio-adnp" 5- reg: The I2C slave address for this device. 6- interrupts: Interrupt specifier for the controllers interrupt. 7- #gpio-cells: Should be 2. The first cell is the GPIO number and the 8 second cell is used to specify optional parameters: 9 - bit 0: polarity (0: normal, 1: inverted) 10- gpio-controller: Marks the device as a GPIO controller 11- nr-gpios: The number of pins supported by the controller. 12 13The GPIO expander can optionally be used as an interrupt controller, in 14which case it uses the default two cell specifier as described in 15Documentation/devicetree/bindings/interrupt-controller/interrupts.txt. 16 17Example: 18 19 gpioext: gpio-controller@41 { 20 compatible = "ad,gpio-adnp"; 21 reg = <0x41>; 22 23 interrupt-parent = <&gpio>; 24 interrupts = <160 1>; 25 26 gpio-controller; 27 #gpio-cells = <2>; 28 29 interrupt-controller; 30 #interrupt-cells = <2>; 31 32 nr-gpios = <64>; 33 }; 34