From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f173.google.com (mail-dy1-f173.google.com [74.125.82.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8045C45D5FF for ; Fri, 16 Oct 2026 22:16:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792188987; cv=none; b=hRZQBuplmNKQhpYEcPtUxmkhlosxpk9EIkduCSRjbf1bFdCDAF2yQEIT7M/nB2e3Jl99ZVzIg8DZslGuU/P0H2krDnErJiLwnJG50mIQwXlUiTtaaSAPUlRneWkfG4t39XXH5rvDSzma24/EMRu/d1lMOq4U6vFuKEvd1Us9+4A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792188987; c=relaxed/simple; bh=USJi1mzL8+lPOcpSNRWr0Z3kEjLwRiOa7ngvLPjI/TA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ohyql7u11+1NwGrs7/AxbOJrjT9OCZH/M5BpAfMPay5066NerVM9+D7QgwStF/4bx78vzxO5YD4o8LXEEjzgoHQV34rcpz1SIwadv/EYynazukBSaHF34/zIW/pBZ8CL6qCav6pmYeLy50OtkyyyHgMAYxbpO/oA0sjEnBLeNAg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=nlvuCuPH; arc=none smtp.client-ip=74.125.82.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nlvuCuPH" Received: by mail-dy1-f173.google.com with SMTP id 5a478bee46e88-33bf40b0c8bso1168698eec.0 for ; Fri, 16 Oct 2026 15:16:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1792188986; x=1792793786; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=7D3GGnuSg0CzAtbTEwk4pCTsYfF5JzaHvUW0xerr6zc=; b=nlvuCuPHnWXB84FmDro+crEVYnrpf8j5LWlh3WtRm6jV/xxRQXsGdxIhF5Anf1NYPH qh7nO0JCxykAKpYQKw3/0OvT+aAF5OgYpBIaY72mfyHP+vC5nL6xyfvbw7oy2xXaAOWm Gr/bp6/Vjd1qqlbCHWBZq7nHrmmZf5mCIPqeSEDyYVso5IuZ/85ZgntDnDRNkWH4o/Z/ hIMI9jjd8ZeKOrY563XdIwufE8b9ckY5Dd/L4zyiRoFpz+MLtOfm/rZPy2mBNk0DIh60 smqCCgxF160QxzJAAc/HOtFKATzVr7obBPNgIdTYaqGMQvrORrSpy+2an2vjDwfi01jQ cu9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792188986; x=1792793786; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=7D3GGnuSg0CzAtbTEwk4pCTsYfF5JzaHvUW0xerr6zc=; b=OOJFBJRaXkbd8KWnPmZ+pjc2GZzh7DDqHbmtADpuSaetv/zEle9q2AUiCOyxgTcT4T sq4/6SX5N1+/dyJUDvKNX6wdUkvgkWHu13Vn+w+eiXzxOrRsG657Ecy21/BxIjvVh/j1 /4t75B6ZLPlKD+TctMnH1MaQ0/oSN2P+mdr2WUA/B+poe9UVYP2VGOPmA1+FuyMZak6n jX6LEyI5NWeNI2SBqOEKoeblfPpykhAcxGv9Df5JDrfrGuUcknZvmSOHlDsgDsNHUc8P KLk/KwD2d2qAYdHNOpGIwbu2lEGgW3Mlx2od+VUQ3P0z5A+AjbYD6YSG2L8IhJhsKtLv bMZA== X-Gm-Message-State: AFq9FYJSH2bsViNVIplDwLM/Uy4SOT08sKDgPYUbJy/SdiDCMSEgTV+b KHU0YEaK+AI9W9KNX3vwZZfdRkOEHrXEvDbzzvsoJh6SgLgKwvWt27HRif2/RBA0 X-Gm-Gg: AYBFou0FtO1cDac8BL9oSUDi3EwGCnCknJqtCUi1l804pc8h2XRSNQ2dwxFjyqK2VAS ke3GvvnTD/4fcokk2FuZLNSr3omMkY9TiMgIuAjBFmasrk2ofLT5+EV7uuVzHeawrTUzSdXZnmc vmiOoFtWe3SpNpRGWMeXLSGoSHWhm5AwfejYLWFahEsQpgE8zoAAbAqHQZagj4nkzGd+DUyRnIo 6zocRr3Vl0R/7+F8LwxlhDkv5nOryCHeTxCaDx32rEm5w/YO9xjrCyaDGFP4YCJl0Kmd9iwkHr2 CmA2v/YnBF7O5tWME2uj/UTG89HDND+fQFvCQX86CQX6PRq7E1TjYUcLf8elRasjIKMjFpeGF/1 tJASKvcEZ12IKAEupx9IoHATIOXouwZUnweuAATliXLMLP2G8jQYlQHMeUoemEHjXn0YuJYH0KO 4uE3yuJfX/8Qa0vVe9O1Yqt1rk7RwgmmgiuWs8Cza4dcbEfA2TC0wes59khPie4Ujly/QtGQ== X-Received: by 2002:a05:7022:b057:10b0:163:8b44:902c with SMTP id a92af1059eb24-18512c37e50mr1582749c88.17.1792188985543; Fri, 16 Oct 2026 15:16:25 -0700 (PDT) Received: from eldorado ([2600:8802:b00:1f84:d294:66ff:fe95:a98e]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1831919fc14sm10480863c88.6.2026.10.16.15.16.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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-mips@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