From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56245 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031921AbbKFFy3 (ORCPT ); Fri, 6 Nov 2015 00:54:29 -0500 Subject: Patch "iio: mxs-lradc: Fix temperature offset" has been added to the 4.2-stable tree To: alexandre.belloni@free-electrons.com, gregkh@linuxfoundation.org, j.uzycki@elpromaelectronics.com, jic23@kernel.org, marex@denx.de, stable@vger.kernel.org, stefan.wahren@i2se.com Cc: , From: Date: Thu, 05 Nov 2015 21:54:16 -0800 Message-ID: <1446789256184154@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled iio: mxs-lradc: Fix temperature offset to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iio-mxs-lradc-fix-temperature-offset.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b94e22805a2224061bb263a82b72e09544a5fbb3 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Wed, 7 Oct 2015 13:10:54 +0200 Subject: iio: mxs-lradc: Fix temperature offset MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Alexandre Belloni commit b94e22805a2224061bb263a82b72e09544a5fbb3 upstream. 0° Kelvin is actually −273.15°C, not -272.15°C. Fix the temperature offset. Also improve the comment explaining the calculation. Reported-by: Janusz Użycki Signed-off-by: Alexandre Belloni Acked-by: Stefan Wahren Acked-by: Marek Vasut Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/mxs-lradc.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -919,11 +919,12 @@ static int mxs_lradc_read_raw(struct iio case IIO_CHAN_INFO_OFFSET: if (chan->type == IIO_TEMP) { /* The calculated value from the ADC is in Kelvin, we - * want Celsius for hwmon so the offset is - * -272.15 * scale + * want Celsius for hwmon so the offset is -273.15 + * The offset is applied before scaling so it is + * actually -213.15 * 4 / 1.012 = -1079.644268 */ - *val = -1075; - *val2 = 691699; + *val = -1079; + *val2 = 644268; return IIO_VAL_INT_PLUS_MICRO; } Patches currently in stable-queue which might be from alexandre.belloni@free-electrons.com are queue-4.2/iio-mxs-lradc-fix-temperature-offset.patch