linux-kernel - Re: [PATCH] iio: mxs-lradc: Fix temperature offset

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Message-ID: <561456ED.5010108@denx.de>
Date:	Wed, 07 Oct 2015 01:19:09 +0200
From:	Marek Vasut <marex@...x.de>
To:	Stefan Wahren <stefan.wahren@...e.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Lars-Peter Clausen <lars@...afoo.de>, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org,
	Janusz Użycki <j.uzycki@...romaelectronics.com>,
	Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH] iio: mxs-lradc: Fix temperature offset

On 10/06/2015 20:43, Stefan Wahren wrote:
> Hi,
>
>> Alexandre Belloni <alexandre.belloni@...e-electrons.com> hat am 6. Oktober
>> 2015 um 16:22 geschrieben:
>>
>>
>> 0° Kelvin is actually −273.15°C, not -272.15°C. Fix the temperature offset.
>>
>> Reported-by: Janusz Użycki <j.uzycki@...romaelectronics.com>
>> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
>> ---
>> drivers/staging/iio/adc/mxs-lradc.c | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/staging/iio/adc/mxs-lradc.c
>> b/drivers/staging/iio/adc/mxs-lradc.c
>> index 3f7715c9968b..67bfa54c4fb1 100644
>> --- a/drivers/staging/iio/adc/mxs-lradc.c
>> +++ b/drivers/staging/iio/adc/mxs-lradc.c
>> @@ -916,10 +916,10 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
>> 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
>> + * -273.15 * scale
>> */
>> - *val = -1075;
>> - *val2 = 691699;
>> + *val = -1079;
>> + *val2 = 644268;
>>
>
> i think it would be nice to break down the calculation of these magic values in
> a second patch.

Indeed, I agree. I hope Alexandre can send another patch for that soon :-)

> Regards
> Stefan
>

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