linux-kernel - Re: [RFC/RFT PATCH] ASoC: topology: Improve backwards compatibility with v4 topology files

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Date:   Wed, 23 May 2018 09:17:23 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Takashi Iwai <tiwai@...e.de>, Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org, Guenter Roeck <groeck@...omium.org>,
        "Patel, Chintan M" <chintan.m.patel@...el.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT PATCH] ASoC: topology: Improve backwards compatibility
 with v4 topology files

On Wed, May 23, 2018 at 8:58 AM Mark Brown <broonie@...nel.org> wrote:

> On Wed, May 23, 2018 at 08:54:18AM -0700, Guenter Roeck wrote:
> > On Wed, May 23, 2018 at 6:56 AM Mark Brown <broonie@...nel.org> wrote:
> > > On Wed, May 23, 2018 at 03:54:54PM +0200, Takashi Iwai wrote:

> > > > And I'm wondering whether we should move these definitions to uapi
> > > > headers.

> > > Yes, we should.

> > Are you sure ? They used to be in
> >  sound/soc/intel/skylake/skl-tplg-interface.h.
> > I took my clue from sound/soc/soc-topology.c, where the v4 structures
are
> > also
> > declared locally and not in the uapi files.

> I'm saying we should move them there.  They're clearly part of the
> userspace ABI and therefore belong in uapi, it was a mistake to let them
> be elsewhere.

They define a firmware file format. Not sure if I would call that userspace
ABI.

I don't mind adding the structures to
sound/soc/intel/skylake/skl-tplg-interface.h,
but it seems a bit out of scope to tie this with moving the file to
include/uapi/sound.
I think that should be a separate discussion.

Thanks,
Guenter