ASoC: ti: davinci-mcasp: Improve the sysclk selection

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When McASP is master the bclk can be generated from two main source:
AUXCLK: functional clock for McASP or
AHCLK: from external source or internal mux in dra7x family

With this patch it is possible to select between the two source. The patch
is not breaking existing machine drivers since historically the clk_id was
ignored and left as 0 in all cases.

When output clock is configured - which can be only the AHCLK, we select
the AUXCLK as source for the internal HCLK. In this case the HCLK rate is
the same as the output clock.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191204192005.31210-1-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Peter Ujfalusi 2019-12-04 21:20:05 +02:00 • committed by Mark Brown

parent abe3b6727b

commit 253f584a06

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35

sound/soc/ti/davinci-mcasp.c

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4

sound/soc/ti/davinci-mcasp.h

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