[alsa-devel] [PATCH 0/2][RFC] ASoC: add simple-graph-card support

[Kuninori Morimoto]

Hi Mark
Cc Laurent

This is graph base DT support with simple-card.
Because it is still [RFC], I don't post full-patch-set yet,
but now we can use simple-card with graph style :)
(If my previous simple-card cleanup patches are accepted :)

Because it is based on simple-card, simple-graph-card can use similar
feature. But unfortunately not full feature are tested well, because
I don't have some of them. Thesea are not well tested feature.
Maybe no big problem, but I don't know

	simple-audio-card,widgets
	simple-audio-card,routing
	simple-audio-card,mclk-fs
	simple-audio-card,hp-det-gpio
	simple-audio-card,mic-det-gpio
	simple-audio-card,dai-tdm-slot-num
	simple-audio-card,dai-tdm-slot-width

Big difference between simple-card <-> simple-graph-card is that
simple-graph-card doesn't support "platform" endpoint.
I don't know how to handle it under graph.

To support graph base DT, CPU/Codec driver might need to adjust.
And, as Jean-Francois mentioned before, CPU/Platform driver
need to register simple-graph-card card.

1 big concern is that it doesn't care about video port at this point.
So, if device has both video/sound ports, simple-graph-card
can't probe card correctly.
We need to have .type or similar property to know it was "video port"
or "sound port" ?
(ASoC need to know dai name, and it is based on total sound port number)

Below are simple-card <-> simple-graph-card DT style

=====================
 simple-card
=====================

sound_card {
	compatible = "simple-audio-card";

	simple-audio-card,format = "left_j";
	simple-audio-card,bitclock-master = <&sndcodec>;
	simple-audio-card,frame-master = <&sndcodec>;

	sndcpu: simple-audio-card,cpu {
		sound-dai = <&soc_port>;
	};

	sndcodec: simple-audio-card,codec {
		sound-dai = <&codec_port>;
		clocks = <&xxx>;
	};
};

codec_port: codec {
	#sound-dai-cells = <0>;
	...
};

soc_port: SoC {
	#sound-dai-cells = <0>;
	...
	soc-port-specific-property
};

=====================
 simple-graph-card
=====================
codec {
	...
	port {
		codec_port: endpoint {
			remote-endpoint = <&soc_port>;
			clocks = <&xxx>;
		};
	};
};

SoC {
	...
	port {
		simple-audio-card,format = "left_j";
		simple-audio-card,bitclock-master = <&codec_port>;
		simple-audio-card,frame-master = <&codec_port>;

		soc_port: endpoint {
			remote-endpoint = <&codec_port>;
			soc-port-specific-property
		};
	};
};



Best regards
---
Kuninori Morimoto