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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Tue, 30 Aug 2022 23:21:18 +0300
Message-ID: <CAHp75VeFbjRN7OE5MH0_bbx5aSerj+2F_vpBjRZhT3QQ+3wmng@mail.gmail.com>
Subject: Re: [PATCH v1 0/8] gpio: Get rid of ARCH_NR_GPIOS (v1)
To:     Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Keerthy <j-keerthy@ti.com>, Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        Jonathan Corbet <corbet@lwn.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
        Linux-Arch <linux-arch@vger.kernel.org>,
        Linux Documentation List <linux-doc@vger.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>
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On Tue, Aug 30, 2022 at 11:20 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Mon, Aug 29, 2022 at 7:17 PM Christophe Leroy
> <christophe.leroy@csgroup.eu> wrote:
> >
> > Since commit 14e85c0e69d5 ("gpio: remove gpio_descs global array")
> > there is no limitation on the number of GPIOs that can be allocated
> > in the system since the allocation is fully dynamic.
> >
> > ARCH_NR_GPIOS is today only used in order to provide downwards
> > gpiobase allocation from that value, while static allocation is
> > performed upwards from 0. However that has the disadvantage of
> > limiting the number of GPIOs that can be registered in the system.
> >
> > To overcome this limitation without requiring each and every
> > platform to provide its 'best-guess' maximum number, rework the
> > allocation to allocate from 256 upwards, allowing approx 2 millions
> > of GPIOs.
> >
> > In the meantime, add a warning for drivers how are still doing
> > static allocation, so that in the future the static allocation gets
> > removed completely and dynamic allocation can start at base 0.
>
> For non-commented (by me or others) patches
> Reviewed-by: Andy Shevchenko <andy.shevchenko!gmail.com>

Should be
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> For the patch 1 if you are going to address as suggested by the author
> of the driver, you may also add my tag.


-- 
With Best Regards,
Andy Shevchenko