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

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Date:	Fri, 15 Jan 2016 15:57:08 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Thomas Betker <thomas.betker@...de-schwarz.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 014/305] iio: adc: xilinx: Fix VREFN scale

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

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

From: Thomas Betker <thomas.betker@...de-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@....de>
Signed-off-by: Thomas Betker <thomas.betker@...de-schwarz.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.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