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Commit b94e2280 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Jonathan Cameron
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iio: mxs-lradc: Fix temperature offset 



0° Kelvin is actually −273.15°C, not -272.15°C. Fix the temperature offset.
Also improve the comment explaining the calculation.

Reported-by: default avatarJanusz Użycki <j.uzycki@elpromaelectronics.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: default avatarStefan Wahren <stefan.wahren@i2se.com>
Acked-by: default avatarMarek Vasut <marex@denx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent eda7d0f3

drivers/staging/iio/adc/mxs-lradc.c

+5 −4
Original line number Diff line number Diff line
@@ -915,11 +915,12 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev, 
	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;

		}