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

[Kuninori Morimoto]

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 at 0 {
			...
		};
		cpu at 1 {
			...
		};
		codec at 1 {
			...
		};
	}
}

	FE-cpu   : cpu at 0
        FE-codec : dummy

        BE-cpu   : cpu at 1
        BE-codec : codec at 1

Best regards
---
Kuninori Morimoto