From patchwork Fri Jun 16 13:52:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 13282804 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D63C5EB64D7 for ; Fri, 16 Jun 2023 13:53:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; 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=l4NnnF4yY3p+VmfCastFjM/JvfbcgKu85kKBwRkOx+U=; b=DPJbZvaS5388Xb K8hw/+5PGWV5G4cOnBktHdST8+urB0AbKpyPtXwiJrggDDoynzWORtizK2PZyiZkdX/P9geEYDFA5 U+StcQ/tVHa/WiQ3c35oLsBP24HE4FNU0mducs/eRJFoX1bAZypRlanYDsW2wcMzudTjeilxSYkNp cWez3L5zhfs63MjB9q/zsc050DS+YZBxnnhnV6Xt3hhRhIuNYqGNDmbVMoEOAI8xgR4/05QDLcF3g XXW6xaYxtcz8SiVZfEJdMNMA9QBVaaGRtV5KV77HOKfeBMhcrfet731wL/7BT7Bb+hT2TKtg/V9rA dqsUq60vJeV4hCLVts3g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qA9t3-000ipF-1V; Fri, 16 Jun 2023 13:53:13 +0000 Received: from relay2-d.mail.gandi.net ([217.70.183.194]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qA9sp-000ilc-0V for linux-arm-kernel@lists.infradead.org; Fri, 16 Jun 2023 13:53:02 +0000 X-GND-Sasl: miquel.raynal@bootlin.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1686923576; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8/g1/Mc++wAHGSDqJ3ioHDS6jCfK/N5G+E68j81znBA=; b=pWQoYCZ+uwxsZMqeD2FW4Zjuf2O9n96N70DXt14iEr9PqM1EvMdMHA98tpo4IJYY2+spNp DuIlYzqPi5FwAzXb3ER3RGXYnwPjFxWENDEKEvF+s142PdNUHTTRY1OwtoLO5RGF69dZ70 4bbMxfa+b9bP4lRoRSznCY1Dm1sWLZ5gQuGHRzSijSxWx3uAwmQ2V4TjM2bNwMAjkYTdNb OR2IwG3dEogJUYjJxoDW8cRiY7egsRTqXairmq6rf4DNqvKsL9lgVk6K2upmjNzLQ0bXAQ bD9X78iesPaaDOcPOmUud7YLsPcVMltJNUCTjvBDu7DkvaHTki80VeE9dp5u/A== X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id BEC0C4000C; Fri, 16 Jun 2023 13:52:55 +0000 (UTC) From: Miquel Raynal To: Sebastian Reichel Subject: [PATCH v3 2/2] power: reset: at91-reset: add sysfs interface to the power on reason Date: Fri, 16 Jun 2023 15:52:52 +0200 Message-Id: <20230616135252.2787679-3-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230616135252.2787679-1-miquel.raynal@bootlin.com> References: <20230616135252.2787679-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230616_065259_462699_C1E27489 X-CRM114-Status: GOOD ( 19.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kamel Bouhara , Alexandre Belloni , linux-pm@vger.kernel.org, Thomas Petazzoni , Miquel Raynal , Claudiu Beznea , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Kamel Bouhara Introduce a list of generic reset sources and use them to export the power on reason through sysfs. Update the ABI documentation to describe this new interface. Signed-off-by: Kamel Bouhara Acked-by: Nicolas Ferre [Miquel Raynal: Follow-up on Kamel's work, 4 years later] Signed-off-by: Miquel Raynal --- .../testing/sysfs-platform-power-on-reason | 12 ++++++ drivers/power/reset/at91-reset.c | 37 ++++++++++++++----- include/linux/power/power_on_reason.h | 19 ++++++++++ 3 files changed, 58 insertions(+), 10 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-platform-power-on-reason create mode 100644 include/linux/power/power_on_reason.h diff --git a/Documentation/ABI/testing/sysfs-platform-power-on-reason b/Documentation/ABI/testing/sysfs-platform-power-on-reason new file mode 100644 index 000000000000..060d6c43f192 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-power-on-reason @@ -0,0 +1,12 @@ +What: /sys/devices/platform/.../power_on_reason +Date: June 2023 +KernelVersion: 6.5 +Contact: Kamel Bouhara +Description: Shows system power on reason. The following strings/reasons can + be read (the list can be extended): + "regular power-up", "RTC wakeup", "watchdog timeout", + "software reset", "reset button action", "CPU clock failure", + "crystal oscillator failure", "low-power condition", + "unknown reason". + + The file is read only. diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c index d6884841a6dc..e42c0aa18966 100644 --- a/drivers/power/reset/at91-reset.c +++ b/drivers/power/reset/at91-reset.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -149,44 +150,54 @@ static int at91_reset(struct notifier_block *this, unsigned long mode, return NOTIFY_DONE; } -static const char * __init at91_reset_reason(struct at91_reset *reset) +static const char *at91_reset_reason(struct at91_reset *reset) { u32 reg = readl(reset->rstc_base + AT91_RSTC_SR); const char *reason; switch ((reg & AT91_RSTC_RSTTYP) >> 8) { case RESET_TYPE_GENERAL: - reason = "general reset"; + reason = POWER_ON_REASON_REGULAR; 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_RST_BTN; break; case RESET_TYPE_CPU_FAIL: - reason = "CPU clock failure detection"; + reason = POWER_ON_REASON_CPU_CLK_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; } return reason; } +static ssize_t power_on_reason_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at91_reset *reset = platform_get_drvdata(pdev); + + return sprintf(buf, "%s\n", at91_reset_reason(reset)); +} +static DEVICE_ATTR_RO(power_on_reason); + static const struct of_device_id at91_ramc_of_match[] = { { .compatible = "atmel,at91sam9260-sdramc", @@ -391,6 +402,12 @@ static int __init at91_reset_probe(struct platform_device *pdev) if (ret) goto disable_clk; + 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\n", at91_reset_reason(reset)); 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..a59d035f1a77 --- /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_REGULAR "regular power-up" +#define POWER_ON_REASON_RTC "RTC wakeup" +#define POWER_ON_REASON_WATCHDOG "watchdog timeout" +#define POWER_ON_REASON_SOFTWARE "software reset" +#define POWER_ON_REASON_RST_BTN "reset button action" +#define POWER_ON_REASON_CPU_CLK_FAIL "CPU clock failure" +#define POWER_ON_REASON_XTAL_FAIL "crystal oscillator failure" +#define POWER_ON_REASON_LOW_POWER "low-power condition" +#define POWER_ON_REASON_UNKNOWN "unknown reason" + +#endif /* POWER_ON_REASON_H */