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[2/2] iio: adc: ad7124: Fix 3dB filter frequency reading

Message ID 6d31f9559939ec04066bec612a59bc7ace2ca548.1741801853.git.u.kleine-koenig@baylibre.com (mailing list archive)
State New
Headers show
Series iio: adc: ad7124: Fix 3dB filter frequency reading | expand

Commit Message

Uwe Kleine-König March 12, 2025, 6:38 p.m. UTC 
The sinc4 filter has a factor 0.23 between Output Data Rate and f_{3dB}
and for sinc3 the factor is 0.272 according to the data sheets for
ad7124-4 (Rev. E.) and ad7124-8 (Rev. F).

Fixes: cef2760954cf ("iio: adc: ad7124: add 3db filter")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/iio/adc/ad7124.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 67d49e6184f7..a3cb47ca3901 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -291,9 +291,9 @@  static int ad7124_get_3db_filter_freq(struct ad7124_state *st,
 
 	switch (st->channels[channel].cfg.filter_type) {
 	case AD7124_FILTER_FILTER_SINC3:
-		return DIV_ROUND_CLOSEST(fadc * 230, 1000);
-	case AD7124_FILTER_FILTER_SINC4:
 		return DIV_ROUND_CLOSEST(fadc * 262, 1000);
+	case AD7124_FILTER_FILTER_SINC4:
+		return DIV_ROUND_CLOSEST(fadc * 230, 1000);
 	default:
 		return -EINVAL;
 	}