Document compatible string, required and optional DT properties for
AS3935 chipset driver.

Signed-off-by: Matt Ranostay <mranos...@gmail.com>
---
 .../devicetree/bindings/iio/proximity/as3935.txt   | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/proximity/as3935.txt

diff --git a/Documentation/devicetree/bindings/iio/proximity/as3935.txt 
b/Documentation/devicetree/bindings/iio/proximity/as3935.txt
new file mode 100644
index 0000000..7e117cd
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/as3935.txt
@@ -0,0 +1,25 @@
+Austrian Microsystems AS3935 Franklin lightning sensor device driver
+
+Required properties:
+       - compatible: must be "ams,as3935"
+       - reg: SPI chip select number for the device
+       - spi-cpha: SPI Mode 1
+       - interrupt-parent : should be the phandle for the interrupt controller
+       - interrupts : interrupt mapping for GPIO IRQ
+
+Optional properties:
+       - ams,tune-cap: Calibration tuning capacitor stepping value 0 - 15.
+         Range of 0 to 120 pF, 8pF steps. This will require using the
+         calibration data from the manufacturer.
+
+
+Example:
+
+as3935@0 {
+       compatible = "ams,as3935";
+       reg = <0>;
+       spi-cpha;
+       interrupt-parent = <&gpio1>;
+       interrupts = <16 1>;
+       ams,tune-cap = /bits/ 8 <10>;
+};
-- 
1.8.3.2

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