dt: Document Holt HI-8435 bindings

These bindings can be used to register Holt HI-8435 threshold detector

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/iio/adc/hi8435.txt b/Documentation/devicetree/bindings/iio/adc/hi8435.txt
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+Holt Integrated Circuits HI-8435 threshold detector bindings
+
+Required properties:
+ - compatible: should be "holt,hi8435"
+ - reg: spi chip select number for the device
+
+Recommended properties:
+ - spi-max-frequency: definition as per
+               Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Optional properties:
+ - gpios: GPIO used for controlling the reset pin
+
+Example:
+sensor@0 {
+       compatible = "holt,hi8435";
+       reg = <0>;
+       gpios = <&gpio6 1 0>;
+
+       spi-max-frequency = <1000000>;
+};