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The values reported by the AD7780 are unsigned with a binary offset: 0x000000 is negative fullscale 0x800000 is zeroscale 0xffffff is positive fullscale So mark the channel in the channel spec as unsigned rather than signed. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>