[PATCH v7 4/6] dt-bindings: iio: adc: Add single-channel property

[Alisa-Dariana Roman]

Devices that have both single-ended channels and differential channels
cause a bit of confusion when the channels are configured in the
devicetree.

Clarify difference between these two types of channels for such devices
by adding single-channel property alongside diff-channels. They should
be mutually exclusive.

Devices that have only single-ended channels can still use reg property
to reference a channel like before.

Suggested-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/iio/adc/adc.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
index 36775f8f71df..0c3eae580732 100644
--- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
@@ -38,6 +38,14 @@ properties:
       The first value specifies the positive input pin, the second
       specifies the negative input pin.
 
+  single-channel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      When devices combine single and differential channels, allow the channel
+      for a single element to be specified, independent of reg (as for
+      differential channels). If this and diff-channels are not present reg
+      shall be used instead.
+
   settling-time-us:
     description:
       Time between enabling the channel and first stable readings.
-- 
2.34.1