1 GPIO Driver for XRA1403 16-BIT GPIO Expander With Reset Input from EXAR
2
3 The 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
14 Properties
15 ----------
16 Check 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
24 Optional 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
31 Example
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 };
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