dt-bindings: iio: accel: Add docs for ADXL372

Add the device tree binding documentation for the ADXL372 3-axis digital
accelerometer.
Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/accel/adxl372.txt

+Analog Devices ADXL372 3-Axis, +/-(200g) Digital Accelerometer
+
+http://www.analog.com/media/en/technical-documentation/data-sheets/adxl372.pdf
+
+Required properties:
+ - compatible : should be "adi,adxl372"
+ - reg: SPI chip select number for the device
+ - spi-max-frequency: Max SPI frequency to use
+
+Optional properties:
+ - interrupts: interrupt mapping for IRQ as documented in
+   Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Example:
+
+	accelerometer@0 {
+		compatible = "adi,adxl372";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		interrupt-parent = <&gpio>;
+		interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+	};

MAINTAINERS

@@ -548,6 +548,7 @@ M:	Stefan Popa <stefan.popa@analog.com>
 W:	http://ez.analog.com/community/linux-device-drivers
 S:	Supported
 F:	drivers/iio/accel/adxl372.c
+F:	Documentation/devicetree/bindings/iio/accel/adxl372.txt
 
 AF9013 MEDIA DRIVER
 M:	Antti Palosaari <crope@iki.fi>