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iio: adc: xilinx: Fix VREFN scale

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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>
This commit is contained in:
Thomas Betker 2015-11-11 21:24:38 +01:00 committed by Jonathan Cameron
parent 0d2f6fd3ff
commit a57f8dac46
1 changed files with 1 additions and 0 deletions
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drivers/iio/adc/xilinx-xadc-core.c
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@ -857,6 +857,7 @@ static int xadc_read_raw(struct iio_dev *indio_dev,
case XADC_REG_VCCINT:
case XADC_REG_VCCAUX:
case XADC_REG_VREFP:
case XADC_REG_VREFN:
case XADC_REG_VCCBRAM:
case XADC_REG_VCCPINT:
case XADC_REG_VCCPAUX: