From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2B4AC4361B for ; Fri, 11 Dec 2020 16:07:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7312E23E24 for ; Fri, 11 Dec 2020 16:07:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406607AbgLKPTG (ORCPT ); Fri, 11 Dec 2020 10:19:06 -0500 Received: from mo4-p01-ob.smtp.rzone.de ([85.215.255.54]:33206 "EHLO mo4-p01-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406596AbgLKPSh (ORCPT ); Fri, 11 Dec 2020 10:18:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1607699726; s=strato-dkim-0002; d=fossekall.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:From: Subject:Sender; bh=JMvZv7gSq46BtayW+KP6deadWehQpacBXgsqn4A6R1g=; b=RQEvkW9+GA+0up63IFNyJjc8/5iHpv8SzT2p+aoDUb8ziyCbkEK6aCa1L7txjdt/eI 49wWLHxEZwGxdBse5GJCw51fznXhe3xrY20VMo3Oc7/iOrvzf59381nePbhG9DnZD/LU WZUA2l9FE4Tu/6HujS0QWHXJ+qhyZTTXPgFeV5OAAWGKD5YAvcIXYZi9bSUgH7xwdPrg 3ohNpTqgPQKWSaryohVFw1Tp29r25ljBH7q9vTwS84tGXFytefa+QgYhdyz926PZfkKC SL0sI+iiqvJbT0l2EiqbTB04mV2z73SryQFkTRto9vXt1rMYpWvNca6qxys7mLx2KyOY H2qw== X-RZG-AUTH: ":O2kGeEG7b/pS1EzgE2y7nF0STYsSLflpbjNKxx7cGrBOdI6BL9pkS3QW19mO7I+/JwRspuzJFZuRzQ==" X-RZG-CLASS-ID: mo00 Received: from aerfugl by smtp.strato.de (RZmta 47.7.1 AUTH) with ESMTPSA id L0a6acwBBFFJ19q (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (curve X9_62_prime256v1 with 256 ECDH bits, eq. 3072 bits RSA)) (Client did not present a certificate); Fri, 11 Dec 2020 16:15:19 +0100 (CET) Received: from koltrast.a98shuttle.de ([192.168.1.27] helo=a98shuttle.de) by aerfugl with smtp (Exim 4.89) (envelope-from ) id 1knk8H-0005Rm-SC; Fri, 11 Dec 2020 16:14:57 +0100 Received: (nullmailer pid 116021 invoked by uid 502); Fri, 11 Dec 2020 15:14:57 -0000 From: Michael Klein To: Sebastian Reichel , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , Michael Klein Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 1/3] power: reset: new driver regulator-poweroff Date: Fri, 11 Dec 2020 16:14:43 +0100 Message-Id: <20201211151445.115943-2-michael@fossekall.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201211151445.115943-1-michael@fossekall.de> References: <20201211151445.115943-1-michael@fossekall.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This driver registers a pm_power_off function to turn off the board by force-disabling a devicetree-defined regulator. Signed-off-by: Michael Klein --- drivers/power/reset/Kconfig | 7 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/regulator-poweroff.c | 82 ++++++++++++++++++++++++ 3 files changed, 90 insertions(+) create mode 100644 drivers/power/reset/regulator-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index d55b3727e00e..b22c4fdb2561 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -177,6 +177,13 @@ config POWER_RESET_QNAP Say Y if you have a QNAP NAS. +config POWER_RESET_REGULATOR + bool "Regulator subsystem power-off driver" + depends on OF && REGULATOR + help + This driver supports turning off your board by disabling a + power regulator defined in the devicetree. + config POWER_RESET_RESTART bool "Restart power-off driver" help diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index c51eceba9ea3..9dc49d3a57ff 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o +obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o diff --git a/drivers/power/reset/regulator-poweroff.c b/drivers/power/reset/regulator-poweroff.c new file mode 100644 index 000000000000..f697088e0ad1 --- /dev/null +++ b/drivers/power/reset/regulator-poweroff.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Force-disables a regulator to power down a device + * + * Michael Klein + * + * Copyright (C) 2020 Michael Klein + * + * Based on the gpio-poweroff driver. + */ +#include +#include +#include +#include +#include +#include + +#define TIMEOUT_MS 3000 + +/* + * Hold configuration here, cannot be more than one instance of the driver + * since pm_power_off itself is global. + */ +static struct regulator *cpu_regulator; + +static void regulator_poweroff_do_poweroff(void) +{ + if (cpu_regulator && regulator_is_enabled(cpu_regulator)) + regulator_force_disable(cpu_regulator); + + /* give it some time */ + mdelay(TIMEOUT_MS); + + WARN_ON(1); +} + +static int regulator_poweroff_probe(struct platform_device *pdev) +{ + /* If a pm_power_off function has already been added, leave it alone */ + if (pm_power_off != NULL) { + dev_err(&pdev->dev, + "%s: pm_power_off function already registered\n", + __func__); + return -EBUSY; + } + + cpu_regulator = devm_regulator_get(&pdev->dev, "cpu"); + if (IS_ERR(cpu_regulator)) + return PTR_ERR(cpu_regulator); + + pm_power_off = ®ulator_poweroff_do_poweroff; + return 0; +} + +static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev) +{ + if (pm_power_off == ®ulator_poweroff_do_poweroff) + pm_power_off = NULL; + + return 0; +} + +static const struct of_device_id of_regulator_poweroff_match[] = { + { .compatible = "regulator-poweroff", }, + {}, +}; + +static struct platform_driver regulator_poweroff_driver = { + .probe = regulator_poweroff_probe, + .remove = regulator_poweroff_remove, + .driver = { + .name = "poweroff-regulator", + .of_match_table = of_regulator_poweroff_match, + }, +}; + +module_platform_driver(regulator_poweroff_driver); + +MODULE_AUTHOR("Michael Klein "); +MODULE_DESCRIPTION("Regulator poweroff driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:poweroff-regulator"); -- 2.29.2