linux-kernel - Re: [PATCH v4 12/23] ASoC: simple-card: Support DPCM DAI link with multiple Codecs

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Message-ID: <87mu4lz6pt.wl-kuninori.morimoto.gx@renesas.com>
Date:   30 Jun 2020 10:24:48 +0900
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     <broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <robh+dt@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <digetx@...il.com>, <alsa-devel@...a-project.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>,
        <nwartikar@...dia.com>, <swarren@...dia.com>,
        <nicoleotsuka@...il.com>
Subject: Re: [PATCH v4 12/23] ASoC: simple-card: Support DPCM DAI link with multiple Codecs


Hi Sameer

> > Maybe base issue for multiple codec support
> > is that simple_for_each_link() is caring first codec only ?
(snip)
> Ideally I wanted to remove above two lines and allow empty codec
> list. But some users may expect the parsing to fail if no 'Codec' is
> found in the DAI link, hence did not remove above. If it is fine to
> remove above two lines it would be simpler. The loop inside
> simple_for_each_link() would anyway loop for each child node of DAI
> link and simple_dai_link_of_dpcm() can parse each 'np'.

Current simple-card is not assuming multi Codec,
thus, we need to update it correctly, not quick-hack.

I'm not sure how to do it, but it seems we need to update
many functions to support it, not only simple-card driver.
For example, simple-card-utils, soc-core, etc, etc...

I'm not sure, this is just my guess.
I'm happy if we can support it more easily :)

But, if it was difficult to keep compatibility on simple-card,
we/you need to have new one.
Actually, I had a plan to create more flexible sound card
driver, but it is not hi priority for me in these days.

Thank you for your help !!

Best regards
---
Kuninori Morimoto