From nobody Thu Dec 18 15:27:34 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 198F7C25B6B for ; Wed, 25 Oct 2023 08:46:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234331AbjJYIqf (ORCPT ); Wed, 25 Oct 2023 04:46:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231794AbjJYIq1 (ORCPT ); Wed, 25 Oct 2023 04:46:27 -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 BFEA6130 for ; Wed, 25 Oct 2023 01:46:24 -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 1qvZWq-0002CG-9l; Wed, 25 Oct 2023 10:46:16 +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 1qvZWp-0048Wk-Ec; Wed, 25 Oct 2023 10:46:15 +0200 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1qvZWp-00CyTR-1C; Wed, 25 Oct 2023 10:46:15 +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 v3 7/7] regulator: Implement uv_survival_time for handling under-voltage events Date: Wed, 25 Oct 2023 10:46:14 +0200 Message-Id: <20231025084614.3092295-8-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231025084614.3092295-1-o.rempel@pengutronix.de> References: <20231025084614.3092295-1-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" Add 'uv_survival_time' field to regulation_constraints for specifying survival time post critical under-voltage event. Update the regulator notifier call chain and Device Tree property parsing to use this new field, allowing a configurable timeout before emergency shutdown. Signed-off-by: Oleksij Rempel --- drivers/regulator/core.c | 2 +- drivers/regulator/of_regulator.c | 6 ++++++ include/linux/regulator/machine.h | 6 ++++++ 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 903c384f25e3..bb864969fc79 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -5077,7 +5077,7 @@ int regulator_notifier_call_chain(struct regulator_de= v *rdev, if (rdev->constraints->system_critical && event =3D=3D REGULATOR_EVENT_UNDER_VOLTAGE) hw_protection_shutdown("System critical voltage drop detected", - REGULATOR_DEF_EMERG_SHUTDWN_TMO); + rdev->constraints->uv_survival_time); =20 _notifier_call_chain(rdev, event, data); return NOTIFY_DONE; diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regula= tor.c index 3bdd6f1919a4..6463b455ebc5 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -175,6 +175,12 @@ static int of_get_regulation_constraints(struct device= *dev, if (!ret) constraints->enable_time =3D pval; =20 + ret =3D of_property_read_u32(np, "regulator-uv-survival-time-ms", &pval); + if (!ret) + constraints->uv_survival_time =3D pval; + else + constraints->uv_survival_time =3D REGULATOR_DEF_EMERG_SHUTDWN_TMO; + constraints->soft_start =3D of_property_read_bool(np, "regulator-soft-start"); ret =3D of_property_read_u32(np, "regulator-active-discharge", &pval); diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/ma= chine.h index 7332ee36e9d6..daddec83d887 100644 --- a/include/linux/regulator/machine.h +++ b/include/linux/regulator/machine.h @@ -158,6 +158,11 @@ struct notification_limit { * regulator_active_discharge values are used for * initialisation. * @enable_time: Turn-on time of the rails (unit: microseconds) + * @uv_survival_time: Survival time post a critical under-voltage event. T= ime + * the system can operate before the on-board capacitors + * fail, providing a window for necessary actions or + * preparations to be taken before power loss. + * (unit: microseconds) */ struct regulation_constraints { =20 @@ -209,6 +214,7 @@ struct regulation_constraints { unsigned int settling_time_up; unsigned int settling_time_down; unsigned int enable_time; + unsigned int uv_survival_time; =20 unsigned int active_discharge; =20 --=20 2.39.2