Re: Query on audio-graph-card DT binding

9 Jan 2024


      Hi Sameer
...
/-----> codec1 endpoint
             /
CPU endpoint \
              -----> codec2 endpoint
It sounds "Single CPU - Mult Codec" connection, and if my understanding
was correct, current ASoC is not supporting it so far.
But dummy CPU with Multi-CPU/Codec connection helps you ?
I'm not 100% sure though...
See
    ${LINUX}/sound/soc/generic/audio-graph-card2-custom-sample.dtsi
DT looks like
[Multi-CPU/Codec]
    		 +-+		 +-+
    	cpu   <--| |<-@--------->| |-> codec1
    	dummy <--| |		 | |-> codec2
    		 +-+		 +-+
Use Multi-CPU/Codec connection with dummy.
audio-graph-card2 {
    	compatible = "audio-graph-card2";
    	links = <&mcpu>;
multi {
    		ports@0 {
    		/* [Multi-CPU] */
    		mcpu:	port@0 { mcpu0_ep: endpoint { remote-endpoint = <&mcodec0_ep>; }; };
    			port@1 { mcpu1_ep: endpoint { remote-endpoint = <&cpu_ep>;     }; };
    			port@2 { mcpu2_ep: endpoint { remote-endpoint = <&dummy_ep>;   }; };
    		};
/* [Multi-Codec] */
    		ports@1 {
    			port@0 { mcodec0_ep: endpoint { remote-endpoint = <&mcpu0_ep>;  }; };
    			port@1 { mcodec1_ep: endpoint { remote-endpoint = <&codec1_ep>; }; };
    			port@2 { mcodec2_ep: endpoint { remote-endpoint = <&codec2_ep>; }; };
    		};
    	};
    };
test_cpu {
    	compatible = "test-cpu";
    	port { dummy_ep: endpoint { remote-endpoint = <&mcpu2_ep>; }; };
    };
Thank you for your help !!
Best regards
---
Renesas Electronics
Ph.D. Kuninori Morimoto