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[ Upstream commitbffb7d9d1a] VAC needs to be wired up to produce proper measurements, without this change only near zero values are reported. Reported-by: kernel test robot <lkp@intel.com> Reported-by: Julia Lawall <julia.lawall@lip6.fr> Fixes:1696f36482("iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver") Signed-off-by: Andreas Kemnade <andreas@kemnade.info> Link: https://lore.kernel.org/r/20221217221305.671117-1-andreas@kemnade.info Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Sasha Levin <sashal@kernel.org>