Hi Mark
Thank you for your help.
But I still want to ask about TDM settings
> > Thanks. We can have total channel number.
> > Then do we have common DT settings/method to indicate below ?
>
> There's some stuff already supported for simple-card - see
> snd_soc_of_parse_tdm_slot(). This won't cover all uses but it should be
> good for simple uses.
In my check, it is caring about
- tdm slot : total channel number
- tdm slot width : bit width for each channel (?)
- tdm tx/rx mask : active slot (?)
tx/rx mask seems care about active/non-active.
We can use it if it sends 6ch sound by using 8ch slot (?).
But it doesn't care about dai connection (?) (= I mean 6ch x 1 or 2ch x 3 etc)
"simple card" should be simple, but CPU/Codec need this "dai connection" information ?
Otherwise, my CPU/Codec can't setup for TDM (= 6ch x 1 or 2ch x 3 etc).
I guess this can be common method, but what do you think ?
And this snd_soc_of_parse_tdm_slot() is called under asoc_simple_card_sub_parse_of().
This means DT is like this ?
sound {
compatible = "simple-audio-card";
...
cpu {
sound-dai = <&xxx>;
dai-tdm-slot-xxx = <xx>;
dai-tdm-slot-xxx = <xx>;
};
codec {
sound-dai = <&xxx>;
dai-tdm-slot-xxx = <xx>;
dai-tdm-slot-xxx = <xx>;
};
};
But I wonder it should be this ?
sound {
compatible = "simple-audio-card";
...
dai-tdm-slot-xxx = <xx>;
dai-tdm-slot-xxx = <xx>;
cpu {
sound-dai = <&xxx>;
};
codec {
sound-dai = <&xxx>;
};
};
In my check this "dai-tdm-slot-xxx" is implemented, but no one is using ?
${LINUX}/Documentation/devicetree/bindings/sound/st,sti-asoc-card.txt
is including dai-tdm-slot-width, but it seems it is ignored today ?
I would like to expand dai-tdm-slot-xxx
1) use common settings for both CPU/Codec
2) add dai connect information
Best regards
---
Kuninori Morimoto
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