linux-kernel - Re: [PATCH 13/13] MIPS: jz4740: Remove custom GPIO code

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Date:   Wed, 18 Jan 2017 08:27:51 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>,
        Ralf Baechle <ralf@...ux-mips.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        james.hogan@...tec.com
Subject: Re: [PATCH 13/13] MIPS: jz4740: Remove custom GPIO code

On Wed, Jan 18, 2017 at 12:14:21AM +0100, Paul Cercueil wrote:
> All the drivers for the various hardware elements of the jz4740 SoC have
> been modified to use the pinctrl framework for their pin configuration
> needs.
> As such, this platform code is now unused and can be deleted.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  arch/mips/include/asm/mach-jz4740/gpio.h | 371 ----------------------
>  arch/mips/jz4740/Makefile                |   2 -
>  arch/mips/jz4740/gpio.c                  | 519 -------------------------------
>  3 files changed, 892 deletions(-)
>  delete mode 100644 arch/mips/jz4740/gpio.c

Have you considered how this could best be merged? It's probably easiest
to take all of this through the MIPS tree because we have an addition of
the pinctrl that would be a replacement for the GPIO code, while at the
same time a bunch of drivers rely on the JZ4740 GPIO code for successful
compilation.

That's slightly complicated by the number of drivers, so needs a lot of
coordination, but it's not the worst I've seen.

Maybe one other solution that would make the transition easier would be
to stub out the GPIO functions if the pinctrl driver is enabled, and do
the removal of the mach-jz4740/gpio.h after all drivers have been merged
through their corresponding subsystem trees. That way all drivers should
remain compilable and functional at runtime, while still having the
possibility to merge through the subsystem trees.

That said, the whole series is fairly simple, so merging everything
through the MIPS tree sounds like the easiest way to go.

Thierry

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