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Fri, 16 Oct 2026 15:16:22 -0700 (PDT) From: Florian Fainelli To: linux-mips@vger.kernel.org Cc: Florian Fainelli , Wim Van Sebroeck , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Bogendoerfer , Dmitry Torokhov , Bartosz Golaszewski , Jakub Kicinski , Andrew Lunn , Ethan Nelson-Moore , Eric Biggers , Greg Kroah-Hartman , Mingyu Wang <25181214217@stu.xidian.edu.cn>, Robert Marko , linux-watchdog@vger.kernel.org (open list:WATCHDOG DEVICE DRIVERS), devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), linux-kernel@vger.kernel.org (open list), manuel.lauss@gmail.com Subject: [PATCH 2/5] dt-bindings: watchdog: gpio: Describe minimum heartbeat intervals Date: Fri, 16 Oct 2026 15:16:14 -0700 Message-ID: <20261016221617.2223004-3-f.fainelli@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261016221617.2223004-1-f.fainelli@gmail.com> References: <20261016221617.2223004-1-f.fainelli@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some GPIO-controlled watchdogs require a minimum interval between input transitions. Add an optional hw-min-interval-ms property to describe this constraint, allowing the watchdog core to defer early keepalives. Also remove the 16-bit limit on hw_margin_ms. The generic GPIO driver has no hardware register imposing this limit, and its heartbeat interval is stored in an unsigned int. The MTX-1 watchdog has a nominal 100-second hardware timeout and requires at least 1.6 seconds between transitions. Signed-off-by: Florian Fainelli --- .../devicetree/bindings/watchdog/linux,wdt-gpio.yaml | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/watchdog/linux,wdt-gpio.yaml b/Documentation/devicetree/bindings/watchdog/linux,wdt-gpio.yaml index 499f1b7e03f9..1adbfe5e5461 100644 --- a/Documentation/devicetree/bindings/watchdog/linux,wdt-gpio.yaml +++ b/Documentation/devicetree/bindings/watchdog/linux,wdt-gpio.yaml @@ -36,7 +36,12 @@ properties: description: Maximum time to reset watchdog circuit (milliseconds). $ref: /schemas/types.yaml#/definitions/uint32 minimum: 2 - maximum: 65535 + + hw-min-interval-ms: + description: + Minimum time between watchdog resets in milliseconds. If omitted, the + watchdog can be reset at any time. Must be less than hw_margin_ms. + minimum: 1 always-running: type: boolean @@ -64,5 +69,7 @@ examples: compatible = "linux,wdt-gpio"; gpios = <&gpio3 9 GPIO_ACTIVE_LOW>; hw_algo = "toggle"; - hw_margin_ms = <1600>; + hw_margin_ms = <100000>; + hw-min-interval-ms = <1600>; + always-running; }; -- 2.53.0