linux-kernel - Re: [RFC PATCH v1 2/9] pinctrl: devicetree: Delete usage of driver_deferred_probe_check

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Message-ID: <CAMuHMdV4Uzfg8aBY=tKnRcig=Npebd158J7UK3zg5_DtHwAR5w@mail.gmail.com>
Date:   Mon, 30 May 2022 11:22:03 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <jstultz@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
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        Linux IOMMU <iommu@...ts.linux-foundation.org>,
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        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC PATCH v1 2/9] pinctrl: devicetree: Delete usage of driver_deferred_probe_check_state()

Hi Saravana,

Thanks for your patch!

On Thu, May 26, 2022 at 10:16 AM Saravana Kannan <saravanak@...gle.com> wrote:
> Now that fw_devlink=on by default and fw_devlink supports
> "pinctrl-[0-8]" property, the execution will never get to the point

0-9?

oh, it's really 0-8:

    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL)
    drivers/of/property.c:DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL)

Looks fragile, especially since we now have:

    arch/arm64/boot/dts/microchip/sparx5_pcb134_board.dtsi:
pinctrl-9 = <&i2cmux_9>;
    arch/arm64/boot/dts/microchip/sparx5_pcb134_board.dtsi: pinctrl-10
= <&i2cmux_10>;
    arch/arm64/boot/dts/microchip/sparx5_pcb134_board.dtsi: pinctrl-11
= <&i2cmux_11>;
    arch/arm64/boot/dts/microchip/sparx5_pcb134_board.dtsi: pinctrl-12
= <&i2cmux_pins_i>;

> where driver_deferred_probe_check_state() is called before the supplier
> has probed successfully or before deferred probe timeout has expired.
>
> So, delete the call and replace it with -ENODEV.
>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds