From: Thomas Betker <thomas.betker@rohde-schwarz.com>
Date: Wed, 11 Nov 2015 20:24:38 +0000 (+0100)
Subject: iio: adc: xilinx: Fix VREFN scale
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a57f8dac46fbac5ab0e31aef1a98b3f6eb30c079;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index ce93bd8e3f68..95c0b3d9890c 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: