Add documentation for the optical tracker PAT9125 and
"position" directory for chip which can provides position data.

Signed-off-by: Alexandre Mergnat <amerg...@baylibre.com>
---
 .../bindings/iio/position/pat9125.txt          | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/position/pat9125.txt

diff --git a/Documentation/devicetree/bindings/iio/position/pat9125.txt 
b/Documentation/devicetree/bindings/iio/position/pat9125.txt
new file mode 100644
index 000000000000..4028aeef9b42
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/position/pat9125.txt
@@ -0,0 +1,18 @@
+PixArt Imaging PAT9125 Optical Tracking Miniature Chip device driver
+
+Required properties:
+       - compatible: must be "pixart,pat9125"
+       - reg: i2c address where to find the device
+       - interrupts: the sole interrupt generated by the device
+
+       Refer to interrupt-controller/interrupts.txt for generic
+       interrupt client node bindings.
+
+Example:
+
+pat9125@75 {
+       compatible = "pixart,pat9125";
+       reg = <0x75>;
+       interrupt-parent = <&gpio3>;
+       interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
+};
-- 
2.17.1

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