[PATCH v2 02/22] pinctrl: pinconf-generic: Add property 'input-debounce-nanoseconds'

From: Changhuang Liang <changhuang.liang@starfivetech.com>
To: Linus Walleij <linusw@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Emil Renner Berthing <kernel@esmil.dk>,
	Paul Walmsley <pjw@kernel.org>, Albert Ou <aou@eecs.berkeley.edu>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Bartosz Golaszewski <brgl@kernel.org>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
	Lianfeng Ouyang <lianfeng.ouyang@starfivetech.com>,
	Changhuang Liang <changhuang.liang@starfivetech.com>
Subject: [PATCH v2 02/22] pinctrl: pinconf-generic: Add property 'input-debounce-nanoseconds'
Date: Thu, 14 May 2026 04:11:58 -0700	[thread overview]
Message-ID: <20260514111218.94519-3-changhuang.liang@starfivetech.com> (raw)
In-Reply-To: <20260514111218.94519-1-changhuang.liang@starfivetech.com>

Add 'input-debounce-nanoseconds' to the generic parameters used for
parsing DT files, along with the corresponding configuration parameter
PIN_CONFIG_INPUT_DEBOUNCE_NS. This allows debounce time to be specified
in nanoseconds as an alternative to the existing 'input-debounce'
property which uses microseconds

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 drivers/pinctrl/pinconf-generic.c       | 2 ++
 include/linux/pinctrl/pinconf-generic.h | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index 64ed28309788..02f88b2b8120 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -43,6 +43,7 @@ static const struct pin_config_item conf_items[] = {
 	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
 	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
+	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE_NS, "input debounce", "nsec", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_UV, "input schmitt threshold", "uV", true),
@@ -185,6 +186,7 @@ static const struct pinconf_generic_params dt_params[] = {
 	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
 	{ "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
 	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
+	{ "input-debounce-nanoseconds", PIN_CONFIG_INPUT_DEBOUNCE_NS, 0 },
 	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
 	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
 	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index a5d4b2d8633a..1df63c732b99 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -71,6 +71,10 @@ struct pinctrl_map;
  *	which means it will wait for signals to settle when reading inputs. The
  *	argument gives the debounce time in usecs. Setting the
  *	argument to zero turns debouncing off.
+ * @PIN_CONFIG_INPUT_DEBOUNCE_NS: this will configure the pin to debounce mode,
+ *	which means it will wait for signals to settle when reading inputs. The
+ *	argument gives the debounce time in nsecs. Setting the
+ *	argument to zero turns debouncing off.
  * @PIN_CONFIG_INPUT_ENABLE: enable the pin's input.  Note that this does not
  *	affect the pin's ability to drive output.  1 enables input, 0 disables
  *	input.
@@ -143,6 +147,7 @@ enum pin_config_param {
 	PIN_CONFIG_DRIVE_STRENGTH,
 	PIN_CONFIG_DRIVE_STRENGTH_UA,
 	PIN_CONFIG_INPUT_DEBOUNCE,
+	PIN_CONFIG_INPUT_DEBOUNCE_NS,
 	PIN_CONFIG_INPUT_ENABLE,
 	PIN_CONFIG_INPUT_SCHMITT,
 	PIN_CONFIG_INPUT_SCHMITT_ENABLE,
-- 
2.25.1

