[alsa-devel] [PATCH 1/7] Documentation: of: add type property

[Kuninori Morimoto]

Hi Rob, Laurent

> > > +Each ports / port / endpoint can have its type if needed.
> > 
> > I think type should only apply to a port. ports is only a grouping for
> > multiple ports. endpoints are just the connection. A port is a single
> > data flow, so 2 endpoints on a port reflect 2 possible connections for
> > that data flow.
> > 
> > > +child node can take over parent node type. below example indicates
> > > +device0 type is "typeA" && "typeB",
> > > +device1 type is "typeA" && "typeB" && "typeC".
> > 
> > This does not make sense to me. A concrete example perhaps using HDMI
> > audio would be helpful.
> 
> "type" on "port" only is OK. I will fix that.
> 
> Multi type feature (= take over from parent) and type on "endpoint"
> is not urgent at this point, so I will drop these in v2.
> I just thought that it will be necessary in the future.

In HDMI case, which one is better DT ?

	port at 0 {
		type = "video";
                endpoint {
                        remote-endpoint = <&xxx>;
                };
	};
	port at 1 {
		type = "sound";
                endpoint {
                        remote-endpoint = <&xxx>;
                };
	};

or

	port {
                endpoint {
			type = "video";
                        remote-endpoint = <&xxx>;
                };
                endpoint {
			type = "sound";
                        remote-endpoint = <&xxx>;
                };
	};

If 2nd one is better, type on endpoint is needed.