[alsa-devel] [PATCH] ASoC: DaVinci: Added support for stereo I2S

[Mark Brown]

On 23 Jun 2010, at 15:33, Raffaele Recalcati wrote:

> From: Raffaele Recalcati <raffaele.recalcati at bticino.it>
> 
> 	Added audio playback support with [frame sync master - clock master] mode
> 	and with [frame sync master - clock slave].
> 	Clock slave can be important when the external codec need system clock
> 	and bit clock synchronized.
> 	In the clock master case there is a FIXME message in the source code, because we
> 	(Davide and myself) have guessed a frequency of 122000000 that seems the base
> 	to be divided.
> 	This patch has been developed against the
> 		http://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci.git
> 	git tree and has been tested on bmx board (similar to dm365 evm, but using
> 	uda1345 as external audio codec).
> 
> Signed-off-by: Raffaele Recalcati <raffaele.recalcati at bticino.it>
> Signed-off-by: Davide Bonfanti <davide.bonfanti at bticino.it>

I'd pretty much echo what Liam said - I'm not 100% sure from your description what the
patch is supposed to do and the code isn't particularly clear either. It *looks* like you're
trying to add a new clock source, but from the description this appears to be an
externally visible clock which makes it very unclear why you have to guess the frequency.