[PATCH 4.2.y-ckt 014/305] iio: adc: xilinx: Fix VREFN scale

From	Kamal Mostafa <kamal@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH 4.2.y-ckt 014/305] iio: adc: xilinx: Fix VREFN scale
Date	2016-01-16 02:40 +0100
Message-ID	<qRo0r-5P2-55@gated-at.bofh.it> (permalink)
References	<qRmBj-507-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Thomas Betker <thomas.betker@rohde-schwarz.com>

commit a57f8dac46fbac5ab0e31aef1a98b3f6eb30c079 upstream.

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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/iio/adc/xilinx-xadc-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index ce93bd8..95c0b3d 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -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:
-- 
1.9.1

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH 4.2.y-ckt 014/305] iio: adc: xilinx: Fix VREFN scale Kamal Mostafa <kamal@canonical.com> - 2016-01-16 02:40 +0100

csiph-web