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

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Date:	Sun, 11 Oct 2015 15:03:26 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Marek Vasut <marex@...x.de>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: mxs-lradc: Fix temperature offset

On 07/10/15 00:13, Marek Vasut wrote:
> On 10/06/2015 16:22, Alexandre Belloni wrote:
>> 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>
> 
> Nice find :-)
> 
> Acked-by: Marek Vasut <marex@...x.de>
Ah, missed this when applying.  Have added your Ack to the V2 and will
push it out later.

J
> 
> (I am using different MUA, please pardon the possible issues)
> 
>> ---
>>   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;
>>
>>               return IIO_VAL_INT_PLUS_MICRO;
>>           }
>>
> 
> -- 
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