dt-bindings Help for MCP ADCs

Signed-off-by: Soeren Andersen <san@rosetechnology.dk>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/iio/adc/mcp320x.txt b/Documentation/devicetree/bindings/iio/adc/mcp320x.txt
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index 0000000..b851843
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+++ b/Documentation/devicetree/bindings/iio/adc/mcp320x.txt
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+* Microchip Analog to Digital Converter (ADC)
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in
+
+        Documentation/devicetree/bindings/spi/spi-bus.txt
+
+must be specified.
+
+Required properties:
+       - compatible:   Must be one of the following, depending on the
+                       model:
+                               "mcp3001"
+                               "mcp3002"
+                               "mcp3004"
+                               "mcp3008"
+                               "mcp3201"
+                               "mcp3202"
+                               "mcp3204"
+                               "mcp3208"
+
+
+Examples:
+spi_controller {
+       mcp3x0x@0 {
+               compatible = "mcp3002";
+               reg = <0>;
+               spi-max-frequency = <1000000>;
+       };
+};