linux-kernel - Re: [PATCH] gpiolib: TODO: add an item about GPIO safe-state

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Message-ID: <CAMRc=Me+srb_rwwaUxx1a=8+Wqm5sc2APzfCoFG3+QxRK5kEKA@mail.gmail.com>
Date:   Fri, 16 Sep 2022 09:11:13 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Kent Gibson <warthog618@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Drew Fustini <dfustini@...libre.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpiolib: TODO: add an item about GPIO safe-state

On Thu, Sep 15, 2022 at 10:59 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Wed, Sep 14, 2022 at 5:11 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> > This adds a new TODO item for gpiolib and can also be used to start
> > a discussion about the need for it and implementation details.
> >
> > Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
>
> Several approaches have been tried in the past. Consider adding
> these lore links:
>
> "[PATCH 3/4] gpio: dt-bindings: Declare gpio-hog optional for GPIO
> subnodes" (2016)
> https://lore.kernel.org/linux-devicetree/1456214089-13954-3-git-send-email-mpa@pengutronix.de/
> "[PATCH] gpio: 74x164: add lines-initial-states property" (2018)
> https://lore.kernel.org/lkml/20180815201855.29738-1-mail@david-bauer.net/"
> "[RFC] Initial state for GPIOs" (2019)
> https://lore.kernel.org/linux-gpio/bee53b48c96603ae8970d42bc4bff386b876bc51.camel@collabora.com/
>
> Just so we don't have to constantly look them up for referral.
>

Of course we were not the first ones to think about it...

I'll read through it later. Was there any particular reason why this
never made its way into the kernel?

Bart