[alsa-devel] [PATCH 4/7] ASoC: Automatically calculate clock ratio for WM8580

Mark Brown broonie at opensource.wolfsonmicro.com
Mon Aug 16 17:19:58 CEST 2010

On Mon, Aug 16, 2010 at 09:51:35PM +0900, Jassi Brar wrote:

> When CPU MASTER was default, people asked for SLAVE. But nobody asked
> for MASTER since we selected SLAVE by default. Both work equally well, it just
> saves our efforts.

What were people actually complaining about?  I suspect it was the root
clock for the audio tree that they were concerned about rather than the
I2S bus clock.

> Btw, I thought CODEC usually provide more accurate signals and hence CPU SLAVE
> is better. Is is too wrong?

Well, the main issue is the quality of the root clock for the tree which
I'd not propose to change away from the CODEC.  In terms of just passing
through a well generated clock at a useful rate it's fairly rare to have
problems, the problem is getting that 256fs (or whatever) root clock.

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