linux-kernel - Re: [PATCH v2 09/19] ASoC: tlv320aic31xx: Remove platform data

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Date:   Wed, 6 Dec 2017 19:11:12 +0000
From:   Mark Brown <broonie@...nel.org>
To:     "Andrew F. Davis" <afd@...com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/19] ASoC: tlv320aic31xx: Remove platform data

On Wed, Dec 06, 2017 at 12:40:45PM -0600, Andrew F. Davis wrote:

> For some userspace feature sure, but this is kernel code, there is no
> guarantee for a sable API, in fact some would probably argue even
> further that there is a guarantee that stuff *will* change and this is a
> good thing as it kinda serves to punish for those you don't try to upstream.

> So the helpfulness bar should be zero for changes that break out-of-tree
> stuff.

There is no need to actively get in people's way or put up barriers to
people who do in future decide to upstream things, that doesn't help
anyone.

> Even more so this patch isn't a zero gain, the cleaner, better looking,
> and easier to maintain code *is* the benefit in itself. Plus we gain the
> ability to set mic-gain voltage with ACPI, something you couldn't do
> before this patch.

If this patch adds ACPI support then the patch description was clearly
not great (I don't think I read the patch itself since the description
just said that it was removing platform data without giving a reason,
that's the main review comment here). 

If you want to use the device property stuff that's fine but there's no
need to remove platform data to do that, it's a smaller change.  I find
it hard to see the platform data as a particularly big blight on the
code here, looking at the driver it's just going to remove the "pdata."
from a few variable accesses which isn't exactly transformational.

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