[alsa-devel] simle-card DT style for DPCM

1 Sep 2014


      Hi Mark, Lars
I want to add DPCM support on simle-card driver.
1st reason is for "sampling-rate-convert".
And, 2nd reason, our customer want to use 2 cpu 1 codec style.
It works in my local environment.
but, I need to know what is the good style for DT.
I guss Xiubo's clean up patch seems good for me,
so, below approach is based on his style.
What do you think this ?
-- normal style --
sound {
    compatible = "simple-audio-card";
    ...
simple-audio-card,dai-link {
    	...
    	cpu {
    		...
    	};
    	codec {
    		...
    	};
    }
}
-- use DPCM for sampling-rate-convert --
sound {
    compatible = "simple-audio-card";
    ...
simple-audio-card,dai-link {
    	...
    	cpu {
    		...
    	};
    	codec {
    		...
    		fixed-sampling-rate = <xxx>;
    	};
    }
}
FE-cpu   : cpu
        FE-codec : dummy
BE-cpu   : dummy
        BE-codec : codec
-- use DPCM for multi DAI --
sound {
    compatible = "simple-audio-card";
    ...
simple-audio-card,dai-link {
    	...
    	cpu@0 {
    		...
    	};
    	cpu@1 {
    		...
    	};
    	codec@1 {
    		...
    	};
    }
}
FE-cpu   : cpu@0
        FE-codec : dummy
BE-cpu   : cpu@1
        BE-codec : codec@1
Best regards
---
Kuninori Morimoto