iio: adc: xilinx: Fix VREFP scale

[ Upstream commit 00db4e52f4541965f7fda225eb458a75f892017b ]

The scaling factor for VREFP is 3.0/4096, not 1.0/4096; fix this to get
correct readings.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 0ad7b502c593d90b2f070acf6c9ca73588bce9d3..6fa629b3c168a7e6125d15c82590bc36b6969ce1 100644 (file)
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -856,6 +856,7 @@ static int xadc_read_raw(struct iio_dev *indio_dev,
                        switch (chan->address) {
                        case XADC_REG_VCCINT:
                        case XADC_REG_VCCAUX:
+                       case XADC_REG_VREFP:
                        case XADC_REG_VCCBRAM:
                        case XADC_REG_VCCPINT:
                        case XADC_REG_VCCPAUX: