Kernel-4.18.0-80.el8_gpio-xra1403

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>;
};