linux-kernel - Re: [PATCH 0/2] Graph fixes for using multiple endpoints per port

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Date:   Wed, 12 Dec 2018 02:11:10 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: [PATCH 0/2] Graph fixes for using multiple endpoints per port


Hi Tony

> > 	https://patchwork.kernel.org/patch/10712877/
> 
> Hmm, so do you have multiple separate ports at the "&sound" node
> hardware? If so then yeah multiple ports make sense.
>
> But if you only a single physical (I2S?) port at the
> "&sound" node hardware, then IMO you should only have one
> port and multiple endpoints there according to the graph.txt
> binding doc.
> 
> In my McBSP case there is only a single physical I2S port
> that can be TDM split into timeslots.

Mine has 4 DAIs. Each DAI can output 2ch.
These will be merged and wil be 8ch TDM and goes to Codec.
But hmm.. it is 4 DAIs, but 1 "physical" interface...

So, your patch seems correct, but will breaks DPCM...
I will confirm it.

Best regards
---
Kuninori Morimoto