[alsa-devel] [PATCH 0/2] Graph fixes for using multiple endpoints per port

[Tony Lindgren]

* Kuninori Morimoto <kuninori.morimoto.gx at renesas.com> [181211 05:30]:
> 
> Hi Tony, again
> 
> > >  	mcbsp3_port: port {
> > > -		cpu_dai3: endpoint {
> > > +		cpu_dai3: endpoint at 0 {
> > >  			dai-format = "dsp_a";
> > >  			frame-master = <&cpcap_audio_codec1>;
> > >  			bitclock-master = <&cpcap_audio_codec1>;
> > >  			remote-endpoint = <&cpcap_audio_codec1>;
> > >  		};
> > > +		cpu_dai_mdm: endpoint at 1 {
> > > +			dai-format = "dsp_a";
> > > +			frame-master = <&cpcap_audio_codec1>;
> > > +			bitclock-master = <&cpcap_audio_codec1>;
> > > +			remote-endpoint = <&mot_mdm6600_audio_codec0>;
> > > +		};
> 
> audio-graph-scu-card and my posting merged audio-graph-card
> are assuming multi-endpoint will be used for DPCM purpose.
> 
> But, above endpoint connection seems you want to is
> not DPCM (?), I'm not sure.

Yes DPCM should work nicely here :)

So to recap, Sebastian already added the cpcap codec a while back,
please see arch/arm/boot/dts/omap4-droid4-xt894.dts for the soundcard
node. Then see the link below for an earlier email describing how the
various components are wired for TDM [0].

Hope that clarifies things a bit more,

Tony

[0] https://lkml.org/lkml/2018/3/28/405