linux-kernel - Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle

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Date:   Tue, 17 Nov 2020 16:05:01 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] mfd: syscon: Add
 syscon_regmap_lookup_by_phandle_optional() function.

On Tue, 17 Nov 2020, Matthias Brugger wrote:

> 
> 
> On 17/11/2020 13:37, Lee Jones wrote:
> > On Tue, 17 Nov 2020, Matthias Brugger wrote:
> > 
> > > Hi Lee,
> > > 
> > > On 13/11/2020 11:19, Lee Jones wrote:
> > > > On Tue, 10 Nov 2020, Enric Balletbo i Serra wrote:
> > > > 
> > > > > This adds syscon_regmap_lookup_by_phandle_optional() function to get an
> > > > > optional regmap.
> > > > > 
> > > > > It behaves the same as syscon_regmap_lookup_by_phandle() except where
> > > > > there is no regmap phandle. In this case, instead of returning -ENODEV,
> > > > > the function returns NULL. This makes error checking simpler when the
> > > > > regmap phandle is optional.
> > > > > 
> > > > > Suggested-by: Nicolas Boichat <drinkcat@...omium.org>
> > > > > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> > > > > Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> > > > > ---
> > > > > 
> > > > > Changes in v2:
> > > > > - Add Matthias r-b tag.
> > > > > - Add the explanation from the patch description to the code.
> > > > > - Return NULL instead of -ENOTSUPP when regmap helpers are not enabled.
> > > > > 
> > > > >    drivers/mfd/syscon.c       | 18 ++++++++++++++++++
> > > > >    include/linux/mfd/syscon.h | 11 +++++++++++
> > > > >    2 files changed, 29 insertions(+)
> > > > 
> > > > Applied, thanks.
> > > > 
> > > 
> > > I've a series [1] that's based on this patch, could you provide a stable
> > > branch for it, so that I can take the series.
> > 
> > Why can't you base it off of for-mfd-next?
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git/log/?h=for-mfd-next
> > 
> 
> I can do that, if you are willing to not overwrite the commit history. In my
> case it can happen that I drop a patch from my for-next branch as I realize
> that it e.g. breaks something. I think that's the reason why normally a
> stable branch get's created, as the commit ID won't change although you
> change the commit history of your for-mfd-next branch.
> 
> If you want to go the route for me rebasing my tree on top of for-mfd-next
> then I'd like to have at least a stable tag, so that it will be easier to
> provide the pull-request later on. Would that be a compromise?

I don't usually provide immutable branches/tags unless I'm sharing
topic branches for other maintainers to pick-up, in order to avoid
merge conflicts.

It's highly irregular (in fact this is a first for me) for a
contributor to request one to base their work on top of.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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