From patchwork Mon Dec 9 09:39:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamel BOUHARA X-Patchwork-Id: 11278771 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2B0F6138D for ; Mon, 9 Dec 2019 09:40:02 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 DA46220663 for ; Mon, 9 Dec 2019 09:40:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="QCla++1F" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA46220663 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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:In-Reply-To:References: List-Owner; bh=B3gS6CXMuSXQXgoynSuX6Ws9NOAIVoY3OPSBqng245s=; b=QCla++1Fjh6uJi 1j44/ekNR2SLq/Kx9JNOIVao/e+p3C/xL42Az3p5TWcARLtU7DLm7YLzQcqj06v4MEN1LOb1rF2SK c27a8YrI4VggfIwelgpAjCawG85+m4J+OmD9qjoZ6zhO4BlWwL2TJ8LiC/zHr+1YBYE1XB3pvkr/N qWf9+YyOKm2IMwazA4CYCe+HZzigmUfxnztbRDMz0bGN9SOSMtbh51bxmYbY9ISzuqT3QuVRBG6b7 mHugDt2m+1LoxcxafHO/gU3pO9hoSFKAcsDaCA8mg6tIZ3UvMMA5GfSxyqAEX/h3UqC6E6KyHPDqm 8gjgVRQNcGtJWDkIQ59A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ieFWJ-0003A2-SF; Mon, 09 Dec 2019 09:39:59 +0000 Received: from relay10.mail.gandi.net ([217.70.178.230]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ieFWG-00039D-4p for linux-arm-kernel@lists.infradead.org; Mon, 09 Dec 2019 09:39:58 +0000 Received: from localhost (lfbn-1-1480-129.w90-65.abo.wanadoo.fr [90.65.102.129]) (Authenticated sender: kamel.bouhara@bootlin.com) by relay10.mail.gandi.net (Postfix) with ESMTPSA id 05870240002; Mon, 9 Dec 2019 09:39:53 +0000 (UTC) From: Kamel Bouhara To: Sebastian Reichel , Nicolas Ferre , Alexandre Belloni , Ludovic Desroches , linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] power: reset: at91-reset: add sysfs interface to the power on reason Date: Mon, 9 Dec 2019 10:39:49 +0100 Message-Id: <20191209093949.44028-1-kamel.bouhara@bootlin.com> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191209_013956_458745_4028695B X-CRM114-Status: GOOD ( 16.07 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [217.70.178.230 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 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: Kamel Bouhara , Thomas Petazzoni Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch export the power on reason through the sysfs interface and introduce some generic reset sources. Update the ABI documentation to list current power on sources. Signed-off-by: Kamel Bouhara Acked-by: Nicolas Ferre --- Changes in v2 ============= - Be less specific on the crystal oscillator value - Add an Acked-by .../sysfs-devices-platform-power-on-reason | 14 ++++++ drivers/power/reset/at91-reset.c | 44 +++++++++++++------ include/linux/power/power_on_reason.h | 19 ++++++++ 3 files changed, 64 insertions(+), 13 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-power-on-reason create mode 100644 include/linux/power/power_on_reason.h -- 2.24.0 diff --git a/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason b/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason new file mode 100644 index 000000000000..83daeb9b1aa2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason @@ -0,0 +1,14 @@ +What: /sys/devices/platform/.../power_on_reason + +Date: October 2019 +KernelVersion: 5.4 +Contact: Kamel Bouhara +Description: This file shows system power on reason. + The possible sources are: + General System Power-ON, RTC wakeup, Watchdog timeout, + Software Reset, User pressed reset button, + CPU Clock failure, 32.768kHz Oscillator Failure, + Low power mode exit, Unknown. + + The file is read only. + diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c index 44ca983a49a1..3cb2df40af37 100644 --- a/drivers/power/reset/at91-reset.c +++ b/drivers/power/reset/at91-reset.c @@ -17,7 +17,7 @@ #include #include #include - +#include #include #include @@ -146,42 +146,42 @@ static int samx7_restart(struct notifier_block *this, unsigned long mode, return NOTIFY_DONE; } -static void __init at91_reset_status(struct platform_device *pdev) +static const char *at91_reset_reason(struct platform_device *pdev) { const char *reason; u32 reg = readl(at91_rstc_base + AT91_RSTC_SR); switch ((reg & AT91_RSTC_RSTTYP) >> 8) { case RESET_TYPE_GENERAL: - reason = "general reset"; + reason = POWER_ON_REASON_GENERAL; break; case RESET_TYPE_WAKEUP: - reason = "wakeup"; + reason = POWER_ON_REASON_RTC; break; case RESET_TYPE_WATCHDOG: - reason = "watchdog reset"; + reason = POWER_ON_REASON_WATCHDOG; break; case RESET_TYPE_SOFTWARE: - reason = "software reset"; + reason = POWER_ON_REASON_SOFTWARE; break; case RESET_TYPE_USER: - reason = "user reset"; + reason = POWER_ON_REASON_USER; break; case RESET_TYPE_CPU_FAIL: - reason = "CPU clock failure detection"; + reason = POWER_ON_REASON_CPU_FAIL; break; case RESET_TYPE_XTAL_FAIL: - reason = "32.768 kHz crystal failure detection"; + reason = POWER_ON_REASON_XTAL_FAIL; break; case RESET_TYPE_ULP2: - reason = "ULP2 reset"; + reason = POWER_ON_REASON_LOW_POWER; break; default: - reason = "unknown reset"; + reason = POWER_ON_REASON_UNKNOWN; break; } - dev_info(&pdev->dev, "Starting after %s\n", reason); + return reason; } static const struct of_device_id at91_ramc_of_match[] = { @@ -204,6 +204,17 @@ static struct notifier_block at91_restart_nb = { .priority = 192, }; +static ssize_t power_on_reason_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + + return sprintf(buf, "%s\n", at91_reset_reason(pdev)); +} + +static DEVICE_ATTR_RO(power_on_reason); + static int __init at91_reset_probe(struct platform_device *pdev) { const struct of_device_id *match; @@ -248,7 +259,14 @@ static int __init at91_reset_probe(struct platform_device *pdev) return ret; } - at91_reset_status(pdev); + ret = device_create_file(&pdev->dev, &dev_attr_power_on_reason); + if (ret) { + dev_err(&pdev->dev, "Could not create sysfs entry\n"); + return ret; + } + + dev_info(&pdev->dev, "Starting after %s reset\n", + at91_reset_reason(pdev)); return 0; } diff --git a/include/linux/power/power_on_reason.h b/include/linux/power/power_on_reason.h new file mode 100644 index 000000000000..9978cc757427 --- /dev/null +++ b/include/linux/power/power_on_reason.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Author: Kamel Bouhra + */ + +#ifndef POWER_ON_REASON_H +#define POWER_ON_REASON_H + +#define POWER_ON_REASON_GENERAL "General" +#define POWER_ON_REASON_RTC "RTC wakeup" +#define POWER_ON_REASON_WATCHDOG "Watchdog timeout" +#define POWER_ON_REASON_SOFTWARE "Software" +#define POWER_ON_REASON_USER "User" +#define POWER_ON_REASON_CPU_FAIL "CPU Clock Failure" +#define POWER_ON_REASON_XTAL_FAIL "32.768k Crystal oscillator Failure" +#define POWER_ON_REASON_LOW_POWER "Low power exit" +#define POWER_ON_REASON_UNKNOWN "Unknown" + +#endif /* POWER_ON_REASON_H */