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

[Jassi Brar]

On Tue, Aug 17, 2010 at 12:19 AM, Mark Brown
<broonie at opensource.wolfsonmicro.com> wrote:
> 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.
No complaints. I just get the task to do.
I guess most quality conscious products can afford to attach a dedicated
OSC to a good CODEC. A CODEC already specifies the clocks it support
and usually comes with 'preferred' input clocks. So, just having a specified
rating accurate enough OSC can take care of quality. On the other hand
the clock sources on CPU side are not particularly accurate for audio-clock
generation. Or so have I seen so far.