Hi Lars Thank you for your comment > > sound { > > compatible = "simple-audio-card"; > > > > /* FrontEnd */ > > simple-audio-card,dai-link@0 { > > ... > > format = "left_j"; > > remote = <&endpoint>; > > > > cpu { > > sound-dai = <&rcar_sound 0>; > > }; > > codec { /* dummy */ }; > > }; > > > > /* BackEnd */ > > endpoint: simple-audio-card,dai-link@1 { > > ... > > format = "left_j"; > > > > cpu { /* dummy */ }; > > codec1: codec { > > sound-dai = <&ak4643>; > > }; > > }; > > }; > > When you try to come up with with a binding try to completely ignore that > something call DPCM exists. The binding is supposed to describe the hardware > and how the different hardware components are interconnected. So try to come > up with a binding that accurately describes the hardware connections. Once > that is done try to map the binding onto the existing software framework. > The last step may require some adjustments to the framework. Now, my system is working well with simple-card by this sound { compatible = "simple-audio-card"; ... cpu { sound-dai = <&rcar_sound 0>; }; codec { sound-dai = <&ak4643>; }; }; The reason why I'm tring to support DPCM on simple-card is "sampling rate convert". My rcar_sound can convert sampling rate, and I tried to add this feature as rcar_sound property. But, Mark rejected and requests me to use DPCM for it, since it can be common featrue. Current existing simple-card can't use it, and I'm tring. But, am I misunderstanding ? Best regards --- Kuninori Morimoto -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html