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