linux-kernel - Re: [PATCH v5 11/14] ASoC: add simple-graph-card document

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Date:   Tue, 6 Dec 2016 09:03:21 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Simon <horms@...ge.net.au>,
        Laurent <laurent.pinchart@...asonboard.com>,
        Guennadi <g.liakhovetski@....de>,
        Grant Likely <grant.likely@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Linux-DT <devicetree@...r.kernel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 11/14] ASoC: add simple-graph-card document

On Mon, Dec 5, 2016 at 6:57 PM, Kuninori Morimoto
<kuninori.morimoto.gx@...esas.com> wrote:
>
> Hi Rob
>
>> I'd expect the top level node to be the card node that knows how to find
>> all the components. The graph should reflect the data flow. For example,
>> the data goes to audio DSP to I2S host to codec to amp.
>
> Do you mean, is this OK for OF graph ?

Yes, something like this.

> in driver point of view, "I2S" is sound card here.

Well, that seems odd to me because I2S should just be the h/w block
that interfaces to I2S/SSI signals. I'd expect you still have a card
node that references these nodes. Maybe it just references the DSP and
then you walk the graph from there to find the I2S controller and
codec.

>
> I2S {
>         port {
>                 i2s-dsp: endpoint {
>                         remote-endpoint = <&dsp>;
>                 }
>                 i2s-codec: endpoint {
>                         remote-endpoint = <&codec>;
>                 }
>         }
> }
>
> DSP {
>         port {
>                 dsp: endpoint {
>                         remote-endpoint = <&i2s-dsp>;
>                 }
>         }
> }
>
> Codec {
>         port {
>                 codec: endpoint {
>                         remote-endpoint = <&i2s-codec>;
>                 }
>         }
> }