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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 05F00C4361B for ; Mon, 7 Dec 2020 14:29:49 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B5B05235FC for ; Mon, 7 Dec 2020 14:29:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B5B05235FC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=fossekall.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=PbJ8d2wejDp2eo9hnvsbPfj52IQu3/j8DLQeW2iw9ww=; b=cIWj+LwF+0AnfGR8/+/0nO15a JrM8ju3CabRYQgYRwyNe7H6+X4iDehuZTZ6JSprefvP0MqUuqElDIb+iapfeZ6FrnUXCgMr7vRyzA 2rQLdBoF3G41mVlqSNf+aeRm/+2hHSHlJHm4xcDJ9u0U/NLgIfmeZ0VgyHaDV9FCgTKWYT1+At/G8 xEgHSDecFLe0tyezGMcQU30IsPkWq/SmSSZ1MQWE66xWRVie6oFjqhPywF8jrwOCNa1pA4UZ97wiM B27xX5BPojjpwNStCmKlUqSPXI+1iGs3CeLNBgjr2/GCsxjBgerU9M59GrXH+Q1Ip6ToCA2gA5KKB /+Hl0soYA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmHVH-0008Bq-JB; Mon, 07 Dec 2020 14:28:39 +0000 Received: from mo4-p02-ob.smtp.rzone.de ([85.215.255.81]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmHUt-000831-FT for linux-arm-kernel@lists.infradead.org; Mon, 07 Dec 2020 14:28:19 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1607351293; s=strato-dkim-0002; d=fossekall.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: X-RZG-CLASS-ID:X-RZG-AUTH:From:Subject:Sender; bh=9xO2wGJAhLl5pgcUNhK9yul/eE7Yn45liR+B7i+kPok=; b=HNS/KiEetJ4q3qFiC4/tedaJIq7pZcUZBYW7NHueG3Xxy7wm0uJAaPrIJ1kSz/X4Yv rrnvFzuvBaHZvDSNP58ykDDR1zPYod8SB7mxwaYuaVDtT+xmNokj1JiOxWAu4EEViIiC HS1rgRuTaUxzn6eqFMUz1TeIX0Lx+TqcTT3IIk2TLB+V/pFjSafnBgSqzK3y14E6kviM 8MVBSYjV/eGW56ZxQ2vMSkHeSjbvZNkY0M21Du+APm6PgK+X0dpZiIj+cZXYvKtdryaa 02ePqIR3BJaj9sYUA93+HYHo57r2Fqeh/D/etHB36/+gSNSXrJ/kCJWI6DjkJY1LOoAX LqDA== X-RZG-AUTH: ":O2kGeEG7b/pS1EzgE2y7nF0STYsSLflpbjNKxx7cGrBOdI6BL9pkS3QW19mO7I+/JwRspuzJFZuRzQ==" X-RZG-CLASS-ID: mo00 Received: from aerfugl by smtp.strato.de (RZmta 47.3.4 AUTH) with ESMTPSA id g02087wB7ESDOVe (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); Mon, 7 Dec 2020 15:28:13 +0100 (CET) Received: from koltrast.a98shuttle.de ([192.168.1.27] helo=a98shuttle.de) by aerfugl with smtp (Exim 4.89) (envelope-from ) id 1kmHUg-0001T2-TJ; Mon, 07 Dec 2020 15:28:02 +0100 Received: (nullmailer pid 17895 invoked by uid 502); Mon, 07 Dec 2020 14:28:02 -0000 From: Michael Klein To: Sebastian Reichel , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , Michael Klein Subject: [PATCH v3 1/3] power: reset: new driver regulator-poweroff Date: Mon, 7 Dec 2020 15:27:54 +0100 Message-Id: <20201207142756.17819-2-michael@fossekall.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201207142756.17819-1-michael@fossekall.de> References: <20201128103958.q6glewhhch7vtczr@gilmour> <20201207142756.17819-1-michael@fossekall.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201207_092815_711137_9DB09DAD X-CRM114-Status: GOOD ( 24.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This driver registers a pm_power_off function to disable a set of regulators defined in the devicetree to turn off the board. Signed-off-by: Michael Klein --- drivers/power/reset/Kconfig | 7 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/regulator-poweroff.c | 107 +++++++++++++++++++++++ 3 files changed, 115 insertions(+) create mode 100644 drivers/power/reset/regulator-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index d55b3727e00e..ae6cb7b0bd4d 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 set + of regulators 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..df2ca4fdcc49 --- /dev/null +++ b/drivers/power/reset/regulator-poweroff.c @@ -0,0 +1,107 @@ +// 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 +#include + +#define DEFAULT_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 **poweroff_regulators; +static u32 timeout = DEFAULT_TIMEOUT_MS; + +static void regulator_poweroff_do_poweroff(void) +{ + struct regulator **it; + + if (poweroff_regulators) + for (it = poweroff_regulators; *it; ++it) + if (regulator_is_enabled(*it)) + regulator_force_disable(*it); + + /* give it some time */ + mdelay(timeout); + + WARN_ON(1); +} + +static int regulator_poweroff_probe(struct platform_device *pdev) +{ + int count; + const char *name; + struct regulator **it; + struct property *prop; + struct device_node *node = pdev->dev.of_node; + + /* 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; + } + + count = of_property_count_strings(node, "regulator-names"); + if (count <= 0) + return -ENOENT; + + poweroff_regulators = devm_kcalloc(&pdev->dev, count + 1, + sizeof(struct regulator *), GFP_KERNEL); + + it = poweroff_regulators; + of_property_for_each_string(node, "regulator-names", prop, name) { + *it = devm_regulator_get(&pdev->dev, name); + if (IS_ERR(*it)) + return PTR_ERR(*it); + it++; + } + + of_property_read_u32(node, "timeout-ms", &timeout); + + 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel