linux-kernel - Re: [PATCH 1/2] gpiolib: acpi: Program debounce when finding GPIO

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Message-ID: <aFvpUBM0xSdM76xz@smile.fi.intel.com>
Date: Wed, 25 Jun 2025 15:19:28 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Mario Limonciello <superm1@...nel.org>
Cc: Hans de Goede <hansg@...nel.org>, Mika Westerberg <westeri@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"open list:GPIO ACPI SUPPORT" <linux-gpio@...r.kernel.org>,
	"open list:GPIO ACPI SUPPORT" <linux-acpi@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..." <linux-input@...r.kernel.org>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH 1/2] gpiolib: acpi: Program debounce when finding GPIO

On Tue, Jun 24, 2025 at 03:22:10PM -0500, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> When soc-button-array looks up the GPIO to use it calls acpi_find_gpio()
> which will parse _CRS.
> 
> acpi_find_gpio.cold (drivers/gpio/gpiolib-acpi-core.c:953)
> gpiod_find_and_request (drivers/gpio/gpiolib.c:4598 drivers/gpio/gpiolib.c:4625)
> gpiod_get_index (drivers/gpio/gpiolib.c:4877)
> 
> The GPIO is setup basically, but the debounce information is discarded.
> The platform will assert what debounce should be in _CRS, so program it
> at the time it's available.

If this will be needed we can factor out acpi_gpio_set_debounce() with
the warning and use it in both cases.

-- 
With Best Regards,
Andy Shevchenko