linux-kernel - Re: [PATCH v1 1/3] gpio: Get rid of duplicate of

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Message-ID: <CACRpkdZbpKqG_uS2N8TW2-HL5CqnuKDpHVCabf66MyQQof0jOw@mail.gmail.com>
Date:   Sun, 5 Dec 2021 01:06:07 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Baruch Siach <baruch@...s.co.il>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Tony Lindgren <tony@...mide.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Jianqun Xu <jay.xu@...k-chips.com>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        Thierry Reding <treding@...dia.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com,
        bcm-kernel-feedback-list@...adcom.com,
        linux-power@...rohmeurope.com,
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        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Keerthy <j-keerthy@...com>, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
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        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: Re: [PATCH v1 1/3] gpio: Get rid of duplicate of_node assignment in
 the drivers

On Thu, Dec 2, 2021 at 10:17 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:

> GPIO library does copy the of_node from the parent device of
> the GPIO chip, there is no need to repeat this in the individual
> drivers. Remove these assignment all at once.
>
> For the details one may look into the of_gpio_dev_init() implementation.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

This is definitely a patch in the right direction, as Bart says
it can be a bit dangerous, the outliers are those drivers that
assign the .dev to something completely different than the
the dev where the of_node is copied from.

The idea was definitely always to only assign it in the core
*unless* there is a reason to have a completely different
of_node for some reason.

> +++ b/drivers/gpio/gpio-rda.c
> @@ -240,8 +240,6 @@ static int rda_gpio_probe(struct platform_device *pdev)
>         rda_gpio->chip.label = dev_name(dev);
>         rda_gpio->chip.ngpio = ngpios;
>         rda_gpio->chip.base = -1;
> -       rda_gpio->chip.parent = dev;
> -       rda_gpio->chip.of_node = np;

Mention in the commit message that in this driver
you also drop the the .parent assignment because the
core will handle it.

Yours,
Linus Walleij