linux-kernel - Re: [PATCH] cedrus: Drop unneeded CONFIG

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Date:   Tue, 21 Apr 2020 00:43:59 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, Hans Verkuil <hverkuil@...all.nl>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH] cedrus: Drop unneeded CONFIG_OF dependency

Hello Paul,

On Mon, 2020-04-20 at 17:29 +0200, Paul Kocialkowski wrote:
> Hi Ezequiel,
> 
> On Fri 03 Apr 20, 09:21, Ezequiel Garcia wrote:
> > On Fri, 2020-04-03 at 10:22 +0200, Paul Kocialkowski wrote:
> > > Hi Ezequiel,
> > > 
> > > On Thu 02 Apr 20, 16:46, Ezequiel Garcia wrote:
> > > > The driver is perfectly capable of being built without CONFIG_OF.
> > > > Remove this dependency, which is useful for compile-only tests.
> > > 
> > > Thanks for the patch!
> > > 
> > > Alas, the driver won't do anything useful without OF enabled, so it seems
> > > useful to keep that dependency.
> > 
> > I'm not convinced about this argument, I like to have
> > dependencies on things the driver needs to compile
> > (except the machine option, see below).
> 
> Is there a general kernel-wide policy about that?
> 

I don't think there is.

> I must admit that I never really understood if Kconfig depends are supposed to
> strictly reflect build dependencies or dependencies that must reasonably be
> expected for the driver to be useful. The arch dependency (which is farily
> common) seems to suggest the latter.
> 

Indeed, it's a good point. Just forget this patch :-)

As a note, some drivers use something like
(ARCH_FOO && OF) || COMPILE_TEST to allow compile
testing in the absence of OF support, if that's
something that you care for.

I do think the ARCH_SUNXI dependency makes sense.

Thanks,
Ezequiel