1GPIO Driver for XRA1403 16-BIT GPIO Expander With Reset Input from EXAR 2 3The XRA1403 is an 16-bit GPIO expander with an SPI interface. Features available: 4 - Individually programmable inputs: 5 - Internal pull-up resistors 6 - Polarity inversion 7 - Individual interrupt enable 8 - Rising edge and/or Falling edge interrupt 9 - Input filter 10 - Individually programmable outputs 11 - Output Level Control 12 - Output Three-State Control 13 14Properties 15---------- 16Check documentation for SPI and GPIO controllers regarding properties needed to configure the node. 17 18 - compatible = "exar,xra1403". 19 - reg - SPI id of the device. 20 - gpio-controller - marks the node as gpio. 21 - #gpio-cells - should be two where the first cell is the pin number 22 and the second one is used for optional parameters. 23 24Optional properties: 25------------------- 26 - reset-gpios: in case available used to control the device reset line. 27 - interrupt-controller - marks the node as interrupt controller. 28 - #interrupt-cells - should be two and represents the number of cells 29 needed to encode interrupt source. 30 31Example 32-------- 33 34 gpioxra0: gpio@2 { 35 compatible = "exar,xra1403"; 36 reg = <2>; 37 38 gpio-controller; 39 #gpio-cells = <2>; 40 41 interrupt-controller; 42 #interrupt-cells = <2>; 43 44 reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>; 45 spi-max-frequency = <1000000>; 46 }; 47