[alsa-devel] [PATCH] ASoC: rsnd: adg :: AUDIO-CLKOUTn can synchronizes with L/R clock.

[Kuninori Morimoto]

Hi Mark

> > AUDIO-CLKOUTn can synchronizes with L/R clock, and Salvator board
> > needs it. Otherwise, specific frequency sound will be noisy.
> 
> Why would a user not want these clocks to be synchronous?  A lot of
> CODECs will at least have better performance if their master clock is
> synchronous to the audio clocks so it'd be a better default, is there an
> advantage to not doing it?

I'm now confusing. We can set system clock on audio card, for example
simple-card case, it is called as "system-clock-frequency".
In my understanding, this "system clock" and above "master clock" are same clock.
but "system clock" is fixed rate (= not related to audio clock in many cases).
Because of this, some codec doesn't request synchronous between
master clock <-> audio clock, but, some codec requests synchronous it.
Am I wrong ??