linux-kernel - Re: [PATCH 1/3] ASoc: amd: create platform device for VG machine driver

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Message-ID: <YWSCg2Nzi8lRDiIE@sirena.org.uk>
Date:   Mon, 11 Oct 2021 19:29:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     "Mukunda,Vijendar" <vijendar.mukunda@....com>
Cc:     alsa-devel@...a-project.org, Alexander.Deucher@....com,
        Sunil-kumar.Dommati@....com, David.Rhodes@...rus.com,
        wtli@...oton.com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ASoc: amd: create platform device for VG machine
 driver

On Mon, Oct 11, 2021 at 11:48:40AM +0530, Mukunda,Vijendar wrote:
> On 10/11/21 11:19 PM, Mark Brown wrote:

> >> +		pdevinfo[3].name = "acp5x_nu8821_cs35l41_mach";

> > This appears to unconditionally assume that any machine with this
> > hardware is going to have exactly the same CODEC/amp combination - that
> > seems like it's going to go badly at some point.  Shouldn't there be
> > some other check that we're instantiating the right machine driver?

> we will make the platform device as generic one something like "acp5x_mach".

> Currently we have only one target platform with above codec combinations
> for this APU series.

> When we get new codecs combinations to support, we will address it in
> machine driver by adding DMI checks for distinguishing codec combinations.

If that's the case then this machine driver that's being instantiated is
poorly named, and I expect you're going to get issues with assuming a
default here and trying to instantiate this machine on unsuitable
hardware.  It'd be better to at least put a bit of the framework in now
and positively indentify systems that can run this machine driver.

It really would be good if ACPI system vendors were to adopt a more
standards based approach to platform enumeration, this really isn't
good.  Something more standards based like DT has would be much more
scalable.

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