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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: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com> Link: https://patch.msgid.link/20240919130444.2100447-7-aardelean@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>