Commit d86deaec authored by Dumitru Ceclan's avatar Dumitru Ceclan Committed by Jonathan Cameron
Browse files

dt-bindings: iio: adc: Add common-mode-channel property 



There are ADCs that are differential but support to measure single-ended
signals on the same channels by connecting a constant voltage to the
negative input pin.

This property allows to properly define a single-ended channel that
requires two inputs to be specified. Software can use the presence of
this property to mark the channel as not differential.

Reviewed-by: default avatarConor Dooley <conor.dooley@microchip.com>
Signed-off-by: default avatarDumitru Ceclan <dumitru.ceclan@analog.com>
Reviewed-by: default avatarNuno Sa <nuno.sa@analog.com>
Reviewed-by: default avatarDavid Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240607-ad4111-v7-1-97e3855900a0@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 182b6164

Documentation/devicetree/bindings/iio/adc/adc.yaml

+11 −0
Original line number Diff line number Diff line
@@ -46,6 +46,17 @@ properties: 
      differential channels). If this and diff-channels are not present reg

      shall be used instead.



  common-mode-channel:

    $ref: /schemas/types.yaml#/definitions/uint32

    description:

      Some ADCs have differential input pins that can be used to measure

      single-ended or pseudo-differential inputs. This property can be used

      in addition to single-channel to signal software that this channel is

      not differential but still specify two inputs.



      The input pair is specified by setting single-channel to the positive

      input pin and common-mode-channel to the negative pin.



  settling-time-us:

    description:

      Time between enabling the channel and first stable readings.