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iio: adc: ad7124: Fix 3dB filter frequency reading

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[ Upstream commit 8712e4986e7ce42a14c762c4c350f290989986a5 ]

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: cef2760954 ("iio: adc: ad7124: add 3db filter")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Link: https://patch.msgid.link/20250317115247.3735016-6-u.kleine-koenig@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2025-03-17 12:52:47 +01:00 committed by Greg Kroah-Hartman
parent ca0012a632
commit ec20928ecb
1 changed files with 2 additions and 2 deletions
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4
drivers/iio/adc/ad7124.c
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@ -300,9 +300,9 @@ static int ad7124_get_3db_filter_freq(struct ad7124_state *st,
switch (st->channels[channel].cfg.filter_type) {
case AD7124_SINC3_FILTER:
return DIV_ROUND_CLOSEST(fadc * 230, 1000);
return DIV_ROUND_CLOSEST(fadc * 272, 1000);
case AD7124_SINC4_FILTER:
return DIV_ROUND_CLOSEST(fadc * 262, 1000);
return DIV_ROUND_CLOSEST(fadc * 230, 1000);
default:
return -EINVAL;
}