Re: More Generic Audio Graph Sound Card idea

Hi Mark

Thank you for feedback

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+--+ => | |<--> Codec1 | |<--> Codec2 +--+

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sound { compatible = "audio-graph-card2";

dais = <&codec2codec>;

};

CODEC2CODEC { compatible = "audio-graph-card2-codec2codec";

ports {
	codec2codec: port@0 { fe_ep: endpoint { remote-endpoint = <&codec1_ep>; }; };
	             port@1 { be_ep: endpoint { remote-endpoint = <&codec2_ep>; }; };
};

};

I'm a bit confused about the use of FE and BE here since the two CODECs are peers rather than this being DPCM - I think that's just a bit cut'n'paste rather than anything else though? The other examples look sensible I think but this one feels odd.

FE here is indicating CPU part's Codec, BE is for Codec part's Codec.

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      *******

PCM0 <--> * * <--> DAI0: Codec Headset PCM1 <--> * * <--> DAI1: Codec Speakers PCM2 <--> * DSP * <--> DAI2: MODEM PCM3 <--> * * <--> DAI3: BT * * <--> DAI4: DMIC * * <--> DAI5: FM *******

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DSP { compatible = "audio-graph-card2-dsp";

ports@0 {
	/* Front-End is pcm0_ep, Back-End is dummy */
	dsp_fe0: port@0 { dsp_fe0_ep: endpoint { remote-endpoint = <&pcm0_ep>; }; };
	         port@1 { };
};

I'm not clear why we need to represent the dummy port here?

I'm thining that port@0 is IN (= CPU), port@1 is OUT (= Codec). Empty endpoint means not yet connected (= dummy).

It is difficut to know it was CPU-dummy or dummy-Codec without it.

Thank you for your help !!

Best regards --- Kuninori Morimoto