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

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Message-ID: <CAMRc=Me3VLbmRksbrHmOdw8NxN7sxXjeuNFb9=6DzE=uLn0oAA@mail.gmail.com>
Date: Fri, 3 Oct 2025 10:03:16 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Markus Probst <markus.probst@...teo.de>
Cc: 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 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?

Bart

> can't be easily disabled in acpi and then redeclared in device tree, as
> it often gets used by other devices declared in acpi (e.g. via GpioInt or
> GpioIo). Thus a disable of acpi and migration to device tree is not always
> possible or very time consuming, while acpi by itself is very limited and
> not always sufficient. This won't affect most configurations, as most of
> the time either CONFIG_ACPI or CONFIG_OF gets enabled, not both.
>
> Signed-off-by: Markus Probst <markus.probst@...teo.de>
> ---