GPIO Driver for XRA1403 16-BIT GPIO Expander With Reset Input from EXAR The XRA1403 is an 16-bit GPIO expander with an SPI interface. Features available: - Individually programmable inputs: - Internal pull-up resistors - Polarity inversion - Individual interrupt enable - Rising edge and/or Falling edge interrupt - Input filter - Individually programmable outputs - Output Level Control - Output Three-State Control Properties ---------- Check documentation for SPI and GPIO controllers regarding properties needed to configure the node. - compatible = "exar,xra1403". - reg - SPI id of the device. - gpio-controller - marks the node as gpio. - #gpio-cells - should be two where the first cell is the pin number and the second one is used for optional parameters. Optional properties: ------------------- - reset-gpios: in case available used to control the device reset line. - interrupt-controller - marks the node as interrupt controller. - #interrupt-cells - should be two and represents the number of cells needed to encode interrupt source. Example -------- gpioxra0: gpio@2 { compatible = "exar,xra1403"; reg = <2>; gpio-controller; #gpio-cells = <2>; interrupt-controller; #interrupt-cells = <2>; reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>; spi-max-frequency = <1000000>; };