From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Date: Fri, 6 Dec 2013 19:31:00 +0000 (+0000)
Subject: iio: mxs-lradc: compute temperature from channel 8 and 9
X-Git-Tag: v3.14-rc1~150^2~163^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8231a9af8147f8a401fc55931ec44abfb937660;p=pandora-kernel.git

iio: mxs-lradc: compute temperature from channel 8 and 9

The mxs LRADC is able to read an internal die temperature sensor. The
temperature has to be calculated from the value read on channel 8 and channel 9.
To be able to expose the result to hwmon, implement iio channel 8 as
(channel 9 - channel 8). Then, implement IIO_CHAN_INFO_SCALE and
IIO_CHAN_INFO_OFFSET so that it can be processed by hwmon through the in kernel
provider/consumer mechanism.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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