From patchwork Tue Jul 27 09:25:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emil Renner Berthing X-Patchwork-Id: 487179 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=-21.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, 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 B7AABC19F37 for ; Tue, 27 Jul 2021 09:26:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A2A806137B for ; Tue, 27 Jul 2021 09:26:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236090AbhG0J0L (ORCPT ); Tue, 27 Jul 2021 05:26:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235946AbhG0J0K (ORCPT ); Tue, 27 Jul 2021 05:26:10 -0400 Received: from mail-ej1-x62a.google.com (mail-ej1-x62a.google.com [IPv6:2a00:1450:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 598F7C061757; Tue, 27 Jul 2021 02:26:09 -0700 (PDT) Received: by mail-ej1-x62a.google.com with SMTP id qk33so2438972ejc.12; Tue, 27 Jul 2021 02:26:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zTxbpyEBi9BLHVqlKkligQWKEqtO8+9t1v/xWkgvTkU=; b=hIF8ix9U4rnGSGmj5vMRPasBGm0tDHFAzvcMAEeiP69CvHPSZ2stmch0+WdJYLwZ/B 8fWCzZuiZ16mLE6nSWFVPWPmKErMNUkf9zIApidOVaASxAmm8YGsF3JmWWe+mLA2JYKI CTQSWNVBTFqH1wk3hUpoFjr2SSI494HOm+v/5ZZFpTPLdWVROnPRdXW8V8HVhAqLCLFt bZwcHhGBdJhmtatEGi/vH12hv6UyiAJsJw7+Qz67eUGrvfTYmi10abuQW8tKGUf94eWb nSkZDxAPH7ff5zzK7FPZvJ8PeIgkwdk4IDOM/WjKufuasb9JDTLyMZ6ERfxbok+Pn+aS UYnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=zTxbpyEBi9BLHVqlKkligQWKEqtO8+9t1v/xWkgvTkU=; b=SMjgSHCZvxg1x048RbBmtpYtKi6478oZm142EeKLy0pdQsJCo/qy70x94F2lNjBk9h UVkQHCVdcZ3J3b19j8a+qp6mK4/sxfe3rbhHHvTPvRsg7wPkHskoNcgU5pj2jLURkSga /kFOf82NEPCDBySeYP/xmVfWM8SLUsA5R/hhWfZtXgeSYySqjHf61pCpIcVRHqBVCQs+ TR8XG08vY8rq697ccSTKPLDfu9sJJ1KwJQt8GvhHfnoPl3UiZWH6PYJqe9KiKTpedT0Y 3SSVaF+aqNQF17M45ZlCyfRtlLdF9LZrmLXwc39yBvEpaHohkpSctTODGIM0XJAeegoJ bMRA== X-Gm-Message-State: AOAM531/qJQKqQ01t43NlsDKZTdUu3qtIU/jbRkM2JvbsFhZBhMDgWcY Aec6lT2fWuxt1AzerZFGv7Y= X-Google-Smtp-Source: ABdhPJzWBthXzvd02bAnk0H2j9AbAxH2DKotrJ6HuwNjc7S9f7aO/yqw3yg2G4aIpf/LkDwcWoBchg== X-Received: by 2002:a17:906:d182:: with SMTP id c2mr21594069ejz.111.1627377967994; Tue, 27 Jul 2021 02:26:07 -0700 (PDT) Received: from stitch.. ([82.192.166.82]) by smtp.gmail.com with ESMTPSA id g3sm692369ejp.2.2021.07.27.02.26.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 02:26:07 -0700 (PDT) Sender: Emil Renner Berthing From: Emil Renner Berthing To: Lee Jones , Rob Herring , Sebastian Reichel Cc: Emil Renner Berthing , devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] power: reset: Add TPS65086 restart driver Date: Tue, 27 Jul 2021 11:25:53 +0200 Message-Id: <20210727092554.1059305-4-kernel@esmil.dk> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210727092554.1059305-1-kernel@esmil.dk> References: <20210727092554.1059305-1-kernel@esmil.dk> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The only way to reset the BeagleV Starlight v0.9 board[1] properly is to tell the PMIC to reset itself which will then assert the external reset lines of the SoC, USB hub and ethernet phy. This adds a driver to register a reset handler to do just that. [1] https://github.com/beagleboard/beaglev-starlight Signed-off-by: Emil Renner Berthing Acked-by: Sebastian Reichel --- drivers/power/reset/Kconfig | 6 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/tps65086-restart.c | 98 ++++++++++++++++++++++++++ 3 files changed, 105 insertions(+) create mode 100644 drivers/power/reset/tps65086-restart.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 4d1192062508..4b563db3ab3e 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -204,6 +204,12 @@ config POWER_RESET_ST help Reset support for STMicroelectronics boards. +config POWER_RESET_TPS65086 + bool "TPS65086 restart driver" + depends on MFD_TPS65086 + help + This driver adds support for resetting the TPS65086 PMIC on restart. + config POWER_RESET_VERSATILE bool "ARM Versatile family reboot driver" depends on ARM diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index cf3f4d02d8a5..f606a2f60539 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -23,6 +23,7 @@ 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-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o diff --git a/drivers/power/reset/tps65086-restart.c b/drivers/power/reset/tps65086-restart.c new file mode 100644 index 000000000000..78b89f745a3d --- /dev/null +++ b/drivers/power/reset/tps65086-restart.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Emil Renner Berthing + */ + +#include +#include +#include +#include +#include + +struct tps65086_restart { + struct notifier_block handler; + struct device *dev; +}; + +static int tps65086_restart_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct tps65086_restart *tps65086_restart = + container_of(this, struct tps65086_restart, handler); + struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent); + int ret; + + ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1); + if (ret) { + dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n", + __func__, ret); + return NOTIFY_DONE; + } + + /* give it a little time */ + mdelay(200); + + WARN_ON(1); + + return NOTIFY_DONE; +} + +static int tps65086_restart_probe(struct platform_device *pdev) +{ + struct tps65086_restart *tps65086_restart; + int ret; + + tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL); + if (!tps65086_restart) + return -ENOMEM; + + platform_set_drvdata(pdev, tps65086_restart); + + tps65086_restart->handler.notifier_call = tps65086_restart_notify; + tps65086_restart->handler.priority = 192; + tps65086_restart->dev = &pdev->dev; + + ret = register_restart_handler(&tps65086_restart->handler); + if (ret) { + dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static int tps65086_restart_remove(struct platform_device *pdev) +{ + struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev); + int ret; + + ret = unregister_restart_handler(&tps65086_restart->handler); + if (ret) { + dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static const struct platform_device_id tps65086_restart_id_table[] = { + { "tps65086-reset", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table); + +static struct platform_driver tps65086_restart_driver = { + .driver = { + .name = "tps65086-restart", + }, + .probe = tps65086_restart_probe, + .remove = tps65086_restart_remove, + .id_table = tps65086_restart_id_table, +}; +module_platform_driver(tps65086_restart_driver); + +MODULE_AUTHOR("Emil Renner Berthing "); +MODULE_DESCRIPTION("TPS65086 restart driver"); +MODULE_LICENSE("GPL v2");