Add the XRA1403 DTS binding documentation.
Signed-off-by: Nandor Han <nandor.han@xxxxxx>
---
.../devicetree/bindings/gpio/gpio-xra1403.txt | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-xra1403.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-xra1403.txt b/Documentation/devicetree/bindings/gpio/gpio-xra1403.txt
new file mode 100644
index 0000000..ccf5337
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-xra1403.txt
@@ -0,0 +1,37 @@
+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: mark the node as gpio.
+
+Optional properties:
+-------------------
+ - reset-gpios: in case available used to control the device reset line.
+
+Example
+--------
+
+ gpioxra0: gpio@2 {
+ compatible = "exar,xra1403";
+ reg = <2>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
+ spi-max-frequency = <1000000>;
+ status = "okay";
+ };
--
2.10.1
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