linux-kernel - Re: [PATCH] gpio: of: make it possible to reference gpios probed in acpi in device tree

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Message-ID: <CAJKOXPcRTcSY7qdPXn15CmzHFJ1mCPxRhBeMzrDyD8u0nyinBg@mail.gmail.com>
Date: Fri, 3 Oct 2025 19:57:59 +0900
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Markus Probst <markus.probst@...teo.de>, Linus Walleij <linus.walleij@...aro.org>, 
	Mika Westerberg <westeri@...nel.org>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: of: make it possible to reference gpios probed in
 acpi in device tree

On Fri, 3 Oct 2025 at 17:51, Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> On Fri, Oct 3, 2025 at 10:40 AM Markus Probst <markus.probst@...teo.de> wrote:
> >
> > On Fri, 2025-10-03 at 10:03 +0200, Bartosz Golaszewski wrote:
> > > On Thu, Oct 2, 2025 at 11:58 PM Markus Probst
> > > <markus.probst@...teo.de> wrote:
> > > >
> > > > sometimes it is necessary to use both acpi and device tree to
> > > > declare
> > >
> > > This is a rather controversial change so "sometimes" is not
> > > convincing
> > > me. I would like to see a user of this added in upstream to consider
> > > it.
> > >
> > > > devices. Not every gpio device driver which has an acpi_match_table
> > > > has
> > > > an of_match table (e.g. amd-pinctrl). Furthermore gpio is an device
> > > > which
> > >
> > > What is the use-case here because I'm unable to wrap my head around
> > > it? Referencing devices described in ACPI from DT? How would the
> > > associated DT source look like?
> > In my specific usecase for the Synology DS923+, there are gpios for
> > powering the usb vbus on (powered down by default), also for powering
> > on sata disks. An example for a regulator defined in DT using a gpio in
> > ACPI (in this case controlling the power of on of the usb ports):
> >
> >         gpio: gpio-controller@...81500 {
> >                 acpi-path = "\\_SB_.GPIO";
> >                 #gpio-cells = <2>;
> >         };
> >
> >         vbus1_regulator: fixedregulator@0 {
> >                 compatible = "regulator-fixed";
> >                 regulator-name = "vbus1_regulator";
> >                 regulator-min-microvolt = <5000000>;
> >                 regulator-max-microvolt = <5000000>;
> >                 gpio = <&gpio 0x2a 0x01>;
> >         };
> >
> > - Markus Probst
> > >
>
> Krzysztof: Could you please look at this and chime in? Does this make any sense?
>


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