Commit ab38c083 authored by Alexandru Ardelean's avatar Alexandru Ardelean Committed by Jonathan Cameron
Browse files

dt-bindings: iio: adc: document diff-channels corner case for some ADCs 



Some ADCs have channels with negative and positive inputs, which can be
used to measure differential voltage levels. These inputs/pins are
dedicated (to the given channel) and cannot be muxed as with other ADCs.

For those types of setups, the 'diff-channels' property can be specified to
be used with the channel number (or reg property) for both negative and
positive inputs/pins.

Reviewed-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: default avatarAlexandru Ardelean <aardelean@baylibre.com>
Link: https://patch.msgid.link/20240919130444.2100447-7-aardelean@baylibre.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 94aab7a0

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

+4 −0
Original line number Diff line number Diff line
@@ -37,6 +37,10 @@ properties: 
      to both the positive and negative inputs of a differential ADC.

      The first value specifies the positive input pin, the second

      specifies the negative input pin.

      There are also some ADCs, where the differential channel has dedicated

      positive and negative inputs which can be used to measure differential

      voltage levels. For those setups, this property can be configured with

      the 'reg' property for both inputs (i.e. diff-channels = <reg reg>).



  single-channel:

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