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

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Date:	Tue, 6 Oct 2015 20:43:53 +0200 (CEST)
From:	Stefan Wahren <stefan.wahren@...e.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, Marek Vasut <marex@...x.de>,
	Janusz Użycki <j.uzycki@...romaelectronics.com>,
	Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH] iio: mxs-lradc: Fix temperature offset

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.

Regards
Stefan
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