Add documentation for the fxas21002c I2C bindings.

Signed-off-by: Afonso Bordado <afonsobord...@az8.co>
---
 .../bindings/iio/gyroscope/fsl,fxas21002c.txt | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/iio/gyroscope/fsl,fxas21002c.txt

diff --git a/Documentation/devicetree/bindings/iio/gyroscope/fsl,fxas21002c.txt 
b/Documentation/devicetree/bindings/iio/gyroscope/fsl,fxas21002c.txt
new file mode 100644
index 000000000000..9e5cdf0c0b69
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/gyroscope/fsl,fxas21002c.txt
@@ -0,0 +1,33 @@
+* Freescale FXAS21002C Digital Angular Rate Gyroscope
+
+Required properties:
+
+  - compatible: must be "fsl,fxas21002c"
+  - reg : the I2C address of the sensor
+
+Optional properties:
+
+  - interrupts         : The first interrupt listed must be the one
+                         connected to the INT1 pin, the second interrupt
+                         listed must be the one connected to the INT2 pin.
+                         The interrupts can be triggered on rising or falling
+                         edges alike.
+                         see interrupt-controller/interrupts.txt
+  - vdd-supply         : The main voltage regulator
+  - iovdd-supply       : The IO voltage regulator
+                         see regulator/regulator.txt
+  - reset-gpios                : GPIO used to reset the device.
+                         see gpio/gpio.txt.
+  - mount-matrix       : see iio/mount-matrix.txt
+
+Example:
+gyroscope@20 {
+       compatible = "fsl,fxas21002c";
+       reg = <0x20>;
+       reset-gpios = <&gpio0 2 0>;
+       vdd-supply = <&vref>;
+       iovdd-supply = <&vref2>;
+       interrupt-parent = <&foo>;
+       interrupts = <0 IRQ_TYPE_EDGE_RISING>,
+                    <1 (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)>;
+};
-- 
2.18.0


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