iio: adc: xilinx: Fix VREFN scale
The scaling factor for VREFN is 3.0/4096 (not 1.0/4096), just as for VREFP. This is not immediately obvious from the specification (Xilinx UG480), but has been confirmed by Xilinx support. Suggested-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -857,6 +857,7 @@ static int xadc_read_raw(struct iio_dev *indio_dev,
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case XADC_REG_VCCINT:
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case XADC_REG_VCCAUX:
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case XADC_REG_VREFP:
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case XADC_REG_VREFN:
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case XADC_REG_VCCBRAM:
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case XADC_REG_VCCPINT:
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case XADC_REG_VCCPAUX:
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