linux-kernel - Re: [PATCH v4 11/13] pinctrl: meson: Replace custom code by gpiochip_node

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Message-ID: <CAHp75VcYaGmEruEsi2UUrLU4=k3OpBn2YV8B0LhyrhtQ=uCTXg@mail.gmail.com>
Date:   Thu, 14 Apr 2022 19:06:21 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Qianggui Song <qianggui.song@...ogic.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic <linux-amlogic@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v4 11/13] pinctrl: meson: Replace custom code by
 gpiochip_node_count() call

On Thu, Apr 14, 2022 at 6:32 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
> On Thu, Apr 14, 2022 at 3:51 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> [...]
> > > This patch landed in linux next-20220413 as commit 88834c75cae5
> > > ("pinctrl: meson: Replace custom code by gpiochip_node_count() call").
> > > Unfortunately it breaks booting of all my Amlogic-based test boards
> > > (Odroid C4, N2, Khadas VIM3, VIM3l). MMC driver is no longer probed and
> > > boards are unable to mount rootfs. Reverting this patch on top of
> > > linux-next fixes the issue.
> >
> > Thank you for letting me know, I'll withdraw it and investigate.
> If needed I can investigate further later today/tomorrow. I think the
> problem is that our node name doesn't follow the .dts recommendation.
>
> For GXL (arch/arm64/boot/dts/amlogic/meson-gxl.dtsi) the GPIO
> controller nodes are for example:
>   gpio: bank@4b0 {
>       ...
>   }
> and
>   gpio_ao: bank@14 {
>       ...
>   }
>
> See also:
> $ git grep -C6 gpio-controller arch/arm64/boot/dts/amlogic/*.dtsi
>
> Marek did not state which error he's getting but I suspect it fails
> with "no gpio node found".

Would be interesting to know that, yeah.

The subtle difference between the patched and unpatched version is
that the former uses only available nodes, it means that node is not
available by some reason and then the error would be the one you
guessed.

-- 
With Best Regards,
Andy Shevchenko