[PATCH 08/10] ASoC: dmaengine_pcm: Add open function for DT DMA request

[Shawn Guo]

On Thu, Mar 14, 2013 at 02:08:32PM +0100, Markus Pargmann wrote:
> On Wed, Mar 13, 2013 at 10:18:29AM +0800, Shawn Guo wrote:
> > On Tue, Mar 12, 2013 at 07:02:07PM +0000, Mark Brown wrote:
> > > On Sun, Mar 10, 2013 at 07:33:09PM +0100, Markus Pargmann wrote:
> > > > Add a function to open a DMA PCM substream using devicetree data
> > > > provided via the client device node. The patch introduces a public
> > > > function and a private subfunction that is called by both open
> > > > functions.
> > > 
> > > Someone (I think it was Shawn) sent a very similar patch just recently
> > > which appears to have fallen out of my inbox unfortunately - can you
> > > please check what's going on there and coordinate with them?  Let me
> > > know if you can't find the patch and I'll dig it out.
> > 
> > It's here, Markus.
> > 
> > http://thread.gmane.org/gmane.linux.alsa.devel/106027/focus=106031
> > 
> 
> Thanks. Do you already have a patch for the non-generic function which I
> could use instead?
> 
I do not follow.  With my patch in place, there will be two
dmaengine_pcm APIs.

int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
        dma_filter_fn filter_fn, void *filter_data)

int snd_dmaengine_generic_pcm_open(struct snd_pcm_substream *substream,
                                   struct device *dev, const char *name)

The first one is for users that their dmaengine driver hasn't converted
to generic device tree bindings, and the second one is for users that
their dmaengine driver is converted to generic device tree bindings.

Shawn