ASoC: rt5670: add API to select ASRC clock source
When codec is in slave mode, ASRC can suppress noise for asynchronous MCLK and LRCLK or special I2S format. This patch defines an API to select the clock source for specified filters. And the codec driver will turn on ASRC for these filters if ASRC is selected as their clock source. Signed-off-by: NBard Liao <bardliao@realtek.com> Signed-off-by: NMengdong Lin <mengdong.lin@intel.com> Signed-off-by: NMark Brown <broonie@kernel.org>
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