ASoC: fsl-asoc-card: add channel and rate constraints for CS42888

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The CS42888 codec has 4 I2S lanes with 2 channels per lane. Using odd
channel counts (3, 5, 7) causes data misalignment in the I2S frame,
resulting in incorrect channel mapping. Only mono and even channel
counts (1, 2, 4, 6, 8) work correctly.

Additionally, the fixed system clock on i.MX platforms limits supported
sample rates. With 12.288 MHz MCLK, only 48kHz family rates (48k, 96k,
192k) achieve valid MCLK:LRCK ratios. With 11.2896 MHz MCLK, only 44k
family rates are supported.

Add a startup callback to apply PCM constraints for both channels and
rates, preventing userspace from requesting unsupported configurations.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20260429100028.2739711-4-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Shengjiu Wang 2026-04-29 18:00:25 +08:00 • committed by Mark Brown

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sound/soc/fsl/fsl-asoc-card.c

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