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iio: adc: ad4030: explain rearranging raw sample data

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Add a comment explaining why the raw sample data is rearranged in the
in the ad4030_conversion() function. It is not so obvious from the code
why this is done.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250310-iio-adc-ad4030-check-scan-type-err-v1-5-589e4ebd9711@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner
2025-03-10 15:43:08 -05:00
committed by Jonathan Cameron
parent 15ffee89c7
commit 9415c8b5b9
1 changed files with 6 additions and 0 deletions
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6
drivers/iio/adc/ad4030.c
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@@ -646,6 +646,12 @@ static int ad4030_conversion(struct iio_dev *indio_dev)
&st->rx_data.dual.diff[0],
&st->rx_data.dual.diff[1]);
/*
* If no common mode voltage channel is enabled, we can use the raw
* data as is. Otherwise, we need to rearrange the data a bit to match
* the natural alignment of the IIO buffer.
*/
if (st->mode != AD4030_OUT_DATA_MD_16_DIFF_8_COM &&
st->mode != AD4030_OUT_DATA_MD_24_DIFF_8_COM)
return 0;