linux-kernel - Re: [RFC PATCH 1/2] dt-bindings: tas2562: Add firmware support for tas2563

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Date:   Tue, 9 Jun 2020 19:47:34 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        robh@...nel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] dt-bindings: tas2562: Add firmware support for
 tas2563

On Tue, Jun 09, 2020 at 01:06:50PM -0500, Dan Murphy wrote:

> I could make a default as you suggested to include i2c address and bus in
> the name.  But the TAS2563 does not need the firmware to operate and the
> 2562 does not have a DSP.

That's fine, the driver can just use the compatible string to check this
and not offer any of the DSP related stuff (it should do this regardless
of the method used here).  I'm guessing the regmap configs should also
be different.

> What if there was an ALSA control instead that passed in the firmware name
> from the user space instead of using the DT?

> Then the control can load and parse the firmware and wait for the user to
> select the program.

> This would solve a user from having ot update the DT to use a firmware.

That's really not very idiomatic for how Linux does stuff and seems to
pretty much guarantee issues with hotplugging controls and ordering -
you'd need special userspace to start up even if it was just a really
simple DSP config doing only speaker correction or something.  I'm not
sure what the advantage would be - what problem is this solving over
static names?

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