Re: Query on audio-graph-card DT binding

[Thierry Reding <thierry.reding@gmail.com>]

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On Tue, Dec 26, 2023 at 09:58:02PM +0530, Sameer Pujar wrote:
> Hi Morimoto-san,
> 
> This question is regarding audio-graph-card.c driver related DT binding.
> 
> I am looking to enable following DAI link connection in device tree for
> Tegra audio:
> 
>               /-----> codec1 endpoint
>              /
> CPU endpoint \
>               \-----> codec2 endpoint
> 
> 
> I see that, "remote-endpoint" property can only specify single phandle
> object for connection to a remote endpoint. In other words, the link can be
> one-to-one. For illustration, please see below example. However I see it
> leads to a build error if phandle-array is provided for "remote-endpoint"
> property.
> 
>  cpu_port {
>      cpu_ep: endpoint {
>          remote-endpoint = <&codec1_ep>, <&codec2_ep>;
>      };
>  };
> 
>  codec1 {
>      codec1_ep: endpoint {
>          remote-endpoint = <&cpu_ep>;
>      };
>  };
> 
>  codec2 {
>      codec2_ep: endpoint {
>          remote-endpoint = <&cpu_ep>;
>      };
>  };
> 
> Is there a possibility to re-use the same CPU endpoint for connecting to
> multiple codec endpoints like shown in above example?

Can you describe the use-case? Is there a need to switch between codec1
and codec2 endpoints or do they receive the same data in parallel all
the time?

Could this perhaps be described by adding multiple CPU ports with one
endpoint each?

Thierry

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