Re: [PATCH v2 2/3] pwm: tegra: Check for match_data being NULL

[Thierry Reding <thierry.reding@kernel.org>]

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On Wed, Sep 30, 2026 at 01:55:59PM +0200, Uwe Kleine-König wrote:
> On Tue, Sep 22, 2026 at 12:06:14PM +0200, Thierry Reding wrote:
> > On Tue, Sep 22, 2026 at 10:33:16AM +0200, Uwe Kleine-König wrote:
> > > Hello,
> > > 
> > > On Mon, Sep 21, 2026 at 06:24:39PM +0200, Thierry Reding wrote:
> > > > You're probably not wrong about opt-in being the more natural choice,
> > > > but looking at commit 3d713e0e382e ("driver core: platform: add device
> > > > binding path 'driver_override'"), the intended use-cases are very
> > > > generic, so it would probably lead to a continuous stream of patches
> > > > needing to be added whenever a new device wants to be supported with
> > > > vfio or something.
> > > 
> > > thinking a bit more about that: The use-case presented in that commit is
> > > about
> > > 
> > > 	echo vfio-platform > /sys/bus/platform/devices/fff51000.ethernet/driver_override
> > > 
> > > . If we had an opt-in mechanism on the driver side, it would only be
> > > vfio* that would need it, wouldn't it? That sounds handleable.
> > 
> > I have a prototype patch that I'm going to send out shortly (after
> > testing that it actually works). The problem ended up being that the
> > driver_override is a device attribute, so there's no good way to drop it
> > based on a driver flag.
> 
> Did you see that I sent such a patch already.
> https://lore.kernel.org/lkml/0f7446324f6a0c8f0153d6532d92a6eeecd6a308.1790612298.git.u.kleine-koenig@baylibre.com/ .
> You were on Cc:, I thought this to be enough to make you aware and
> didn't mention it in this thread here.
> 
> I hope to not have provoked much duplicate work.

Well, from the looks of it you ended up hijacking my earlier attempt
while it was being discussed. It's customary to ask before you do so,
specifically in order to avoid duplication of work. Or at least answer
on the original thread that you plan to take this in a different
direction so that people know what's going on.

Anyway, I was still waiting for any conclusions on the original thread
and didn't spend any more time revisiting my original series, so no harm
done.

Thierry

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