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Message-Id: <20250310-iio-adc-ad4030-check-scan-type-err-v1-5-589e4ebd9711@baylibre.com> Date: Mon, 10 Mar 2025 15:43:08 -0500 From: David Lechner <dlechner@...libre.com> To: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, Nuno Sá <nuno.sa@...log.com>, Esteban Blanc <eblanc@...libre.com>, Jonathan Cameron <jic23@...nel.org> Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, David Lechner <dlechner@...libre.com> Subject: [PATCH 5/5] iio: adc: ad4030: explain rearranging raw sample data 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@...libre.com> --- drivers/iio/adc/ad4030.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/iio/adc/ad4030.c b/drivers/iio/adc/ad4030.c index 54ad74b96c9f256a67848330f875379edc828b0b..636f9f33e66af73d102722b984dc1230e1417d1e 100644 --- a/drivers/iio/adc/ad4030.c +++ b/drivers/iio/adc/ad4030.c @@ -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; -- 2.43.0
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