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

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Message-ID: <fb286ab7-21f2-43ad-2751-c76b7b6e4cf2@nvidia.com>
Date:   Thu, 2 Jul 2020 16:06:14 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Mark Brown <broonie@...nel.org>
CC:     <spujar@...dia.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        <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: Re: Re: [PATCH v4 12/23] ASoC: simple-card: Support DPCM DAI link
 with multiple Codecs



On 6/30/2020 9:02 PM, Mark Brown wrote:
> On Tue, Jun 30, 2020 at 06:23:49PM +0530, Sameer Pujar wrote:
>> On 6/30/2020 4:31 PM, Mark Brown wrote:
>>> Why simple-card and not audio-graph-card?
>> Frankly speaking I have not used audio-graph-card before. I had a brief look
>> at the related binding. It seems it can use similar DT properties that
>> simple-card uses, although the binding style appears to be different.
>> However I am not sure if it offers better solutions to the problems I am
>> facing. For example, the ability to connect or form a chain of components to
>> realize more complicated use cases with DPCM, some of which were discussed
>> in [0]. Can you please help me understand why it could be preferred?
>> [0] https://lkml.org/lkml/2020/4/30/519
> It's the more modern thing which covers everything simple-card does and
> more, I'd expect new development to go into that rather than
> simple-card.

Hi Mark & Kuninori,

For the HW I am using, there are no fixed endpoints and I am not sure if 
it is allowed to have empty endpoints in audio-graph-card. 
Crossbar/router provides the flexibility to connect the components in 
any required order. Patch [05/23] exposes required graph and MUX 
controls for the flexible configurations. Mostly, in DT, I am trying to 
model the component itself and finally router can help me specify the 
audio path to interconnect various components. Hence I was trying to 
understand if it is really necessary to represent the links using 
audio-graph-card. Kindly help me understand what more it offers. If 
simple-card works fine, are we allowed to use it?

Thank you,
Sameer.