From nobody Wed Dec 17 11:33:41 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CCA3C25B6B for ; Thu, 26 Oct 2023 14:48:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345383AbjJZOs4 (ORCPT ); Thu, 26 Oct 2023 10:48:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235107AbjJZOso (ORCPT ); Thu, 26 Oct 2023 10:48:44 -0400 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 592281B3 for ; Thu, 26 Oct 2023 07:48:41 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qw1es-0005Zs-2A; Thu, 26 Oct 2023 16:48:26 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1qw1er-004Qq7-KK; Thu, 26 Oct 2023 16:48:25 +0200 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1qw1er-00H3Y3-1o; Thu, 26 Oct 2023 16:48:25 +0200 From: Oleksij Rempel To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Oleksij Rempel , kernel@pengutronix.de, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v4 4/5] regulator: dt-bindings: Add 'regulator-uv-less-critical-window-ms' property Date: Thu, 26 Oct 2023 16:48:23 +0200 Message-Id: <20231026144824.4065145-5-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231026144824.4065145-1-o.rempel@pengutronix.de> References: <20231026144824.4065145-1-o.rempel@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Introduces a new devicetree property to specifies the time window (in milliseconds) following a critical under-voltage (UV) event during which less critical actions can be safely carried out by the system. Less Critical Actions: - Logging the under-voltage event for later analysis. - Saving less critical data that may be useful for diagnosing issues or for audit purposes. More Critical Actions (post the less critical window): - Initiating procedures to properly shutdown hardware to prevent damage. The 'regulator-uv-less-critical-window-ms' property is crucial for conveying board-specific hardware characteristics, not for enforcing a certain policy. The time window represented by this property is derived from the physical attributes of the hardware like the capacity of on-board capacitors, the power consumption of the components, and the time needed to safely shut down hardware to prevent damage. These attributes can significantly vary between different boards, making it a board-specific property rather than a policy directive. By providing a precise representation of the time available for less critical actions post an under-voltage event, this property enables the kernel to make informed decisions on action prioritization, ensuring that essential preventative measures are taken to avoid hardware damage while also allowing for data capture and analysis. Signed-off-by: Oleksij Rempel Acked-by: Rob Herring --- .../devicetree/bindings/regulator/regulator.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/regulator/regulator.yaml b/D= ocumentation/devicetree/bindings/regulator/regulator.yaml index 5b8d55f7c43b..1ef380d1515e 100644 --- a/Documentation/devicetree/bindings/regulator/regulator.yaml +++ b/Documentation/devicetree/bindings/regulator/regulator.yaml @@ -186,6 +186,14 @@ properties: be enabled but limit setting can be omitted. Limit is given as micro= volt offset from voltage set to regulator. =20 + regulator-uv-less-critical-window-ms: + description: Specifies the time window (in milliseconds) following a + critical under-voltage event during which the system can continue to + operate safely while performing less critical operations. This prope= rty + provides a defined duration before a more severe reaction to the + under-voltage event is needed, allowing for certain non-urgent actio= ns to + be carried out in preparation for potential power loss. + regulator-temp-protection-kelvin: description: Set over temperature protection limit. This is a limit wh= ere hardware performs emergency shutdown. Zero can be passed to disable --=20 2.39.2