linux-kernel - Re: [PATCH v2 2/2] gpio: of: Add DT overlay support for GPIO hogs

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Message-ID: <CACRpkdbFRv2ab-fa3htiLBTmW4kCuB6Rmxb0Afj=eP4hH0W7BA@mail.gmail.com>
Date:   Fri, 21 Feb 2020 17:10:25 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Chris Brandt <chris.brandt@...esas.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] gpio: of: Add DT overlay support for GPIO hogs

On Thu, Feb 20, 2020 at 2:01 PM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:

> As GPIO hogs are configured at GPIO controller initialization time,
> adding/removing GPIO hogs in DT overlays does not work.
>
> Add support for GPIO hogs described in DT overlays by registering an OF
> reconfiguration notifier, to handle the addition and removal of GPIO hog
> subnodes to/from a GPIO controller device node.
>
> Note that when a GPIO hog device node is being removed, its "gpios"
> properties is no longer available, so we have to keep track of which
> node a hog belongs to, which is done by adding a pointer to the hog's
> device node to struct gpio_desc.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2:
>   - Drop RFC state,
>   - Document that modifying existing gpio-hog nodes is not supported.

Clean and well separated code, patch applied
with Frank's review tag!

Yours,
Linus Walleij