Merge branch 'drm-next-4.12' of git://people.freedesktop.org/~agd5f/linux into drm...
[sfrench/cifs-2.6.git] / Documentation / devicetree / bindings / gpio / gpio-xra1403.txt
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         };