dt-bindings:iio:adc:adc.txt: Add documentation for channel label attribute

Optional attribute for better identification of the channels.

Signed-off-by: Cristian Pop <cristian.pop@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200928090959.88842-5-cristian.pop@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/adc/adc.txt b/Documentation/devicetree/bindings/iio/adc/adc.txt
index 5bbaa330a2506f021b09db6e58462bd6adf2994b..4b37575bbddc511ea926ae0e9571dde7ae985987 100644 (file)
--- a/Documentation/devicetree/bindings/iio/adc/adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/adc.txt
@@ -5,18 +5,24 @@ Optional properties for child nodes:
 - diff-channels : Differential channels muxed for this ADC. The first value
                specifies the positive input pin, the second value the negative
                input pin.
+- reg: The channel number.
+- label: Unique name to identify which channel this is.
 
 Example:
        adc@0 {
                compatible = "some,adc";
                ...
                channel@0 {
+                       reg = <0>;
+                       label = "channel_0_name";
                        bipolar;
                        diff-channels = <0 1>;
                        ...
                };
 
                channel@1 {
+                       reg = <1>;
+                       label = "channel_1_name";
                        diff-channels = <2 3>;
                        ...
                };