Thread (20 messages) 20 messages, 3 authors, 2025-06-27
STALE386d
Revisions (3)
  1. v1 [diff vs current]
  2. v2 current
  3. v3 [diff vs current]

[PATCH v2 2/3] gpiolib: acpi: Program debounce when finding GPIO

From: Mario Limonciello <superm1@kernel.org>
Date: 2025-06-25 18:13:51
Also in: linux-acpi, linux-gpio, lkml
Subsystem: gpio acpi support, gpio subsystem, the rest · Maintainers: Mika Westerberg, Andy Shevchenko, Linus Walleij, Bartosz Golaszewski, Linus Torvalds

From: Mario Limonciello <mario.limonciello@amd.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.

Cc: Hans de Goede <hansg@kernel.org>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v2:
 * Make non fatal by using helper from patch 1 (Andy)
---
 drivers/gpio/gpiolib-acpi-core.c | 1 +
 1 file changed, 1 insertion(+)
diff --git a/drivers/gpio/gpiolib-acpi-core.c b/drivers/gpio/gpiolib-acpi-core.c
index 1895e45bd9f16..15222bfc25bb2 100644
--- a/drivers/gpio/gpiolib-acpi-core.c
+++ b/drivers/gpio/gpiolib-acpi-core.c
@@ -962,6 +962,7 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode,
 
 	acpi_gpio_update_gpiod_flags(dflags, &info);
 	acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
+	acpi_set_debounce_timeout(desc, info.debounce);
 	return desc;
 }
 
-- 
2.43.0
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