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Subject: Re: More Generic Audio Graph Sound Card idea
To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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From: Sameer Pujar <spujar@nvidia.com>
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Date: Fri, 21 Aug 2020 13:58:15 +0530
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Cc: Linux-ALSA <alsa-devel@alsa-project.org>, Mark Brown <broonie@kernel.org>,
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Hi Morimoto-san,

...

>> If we encode use case information in DT, it would become regid and is
>> not flexible when the HW is giving us the all flexibility (at least in
>> my case). Thus may lead to complications. If there is a way to
>> configure PCM parameters from the user space it would help to simplify
>> things. Then DT can just describe the HW links.
> What kind of PCM parameters you want to get from user-space ?

I was referring to channels, rate, sample size for PCM parameters which 
are part of hw_params(). Having these strictly defined in DT would limit 
from using the same audio path for different configurations. So far used 
mixer controls for overriding this info in hw_param(), but this idea is 
dropped as per Mark's suggestion earlier. The requirement here is, some 
components have the ability to alter these parameters. Subsequent 
components in the audio path should me made aware of this.

For example, SRC (sample rate converter) can change 'rate' info coming 
from hw_param(). Similarly 'mux/demux' can change channel info. Fixing 
one set of configuration in DT will limit the usage. If this is 
configurable from user space, then it would be lot more easier.

. . .