From patchwork Fri Apr 3 13:07:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Stefan_Riedm=C3=BCller?= X-Patchwork-Id: 215089 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 73D64C43331 for ; Fri, 3 Apr 2020 13:07:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 054FE2073B for ; Fri, 3 Apr 2020 13:07:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=temperror (0-bit key) header.d=phytec.de header.i=@phytec.de header.b="Q8z5Y0U8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728143AbgDCNHa (ORCPT ); Fri, 3 Apr 2020 09:07:30 -0400 Received: from mickerik.phytec.de ([195.145.39.210]:65370 "EHLO mickerik.phytec.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728117AbgDCNHa (ORCPT ); Fri, 3 Apr 2020 09:07:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; d=phytec.de; s=a1; c=relaxed/simple; q=dns/txt; i=@phytec.de; t=1585919249; x=1588511249; h=From:Sender:Reply-To:Subject:Date:Message-Id:To:Cc:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=lJci58XPLAs6Gaqe7C4KQCaN7ChYybm9aJTatTD89/A=; b=Q8z5Y0U8BXNp0xVZEafTnl5Bi4I1eFhunmLO8ffrT2HryyaDOOAojd1EMFnEhzUN KT3bG5gWUdwDoSjXgSsRRPj10fGYB26bAofibCs5s5KOc66U7IRpc18TeQsiPKQV W07/7zBIUifJQ01muxgvH7DqXqlcJrqJz7/j9/7hK3g=; X-AuditID: c39127d2-583ff70000001db9-db-5e873511793f Received: from idefix.phytec.de (Unknown_Domain [172.16.0.10]) by mickerik.phytec.de (PHYTEC Mail Gateway) with SMTP id 42.88.07609.115378E5; Fri, 3 Apr 2020 15:07:29 +0200 (CEST) Received: from augenblix2.phytec.de ([172.16.0.56]) by idefix.phytec.de (IBM Domino Release 9.0.1FP7) with ESMTP id 2020040315072879-138368 ; Fri, 3 Apr 2020 15:07:28 +0200 From: Stefan Riedmueller To: Wim Van Sebroeck , Guenter Roeck , Support Opensource Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] watchdog: da9062: Initialize timeout during probe Date: Fri, 3 Apr 2020 15:07:26 +0200 Message-Id: <20200403130728.39260-1-s.riedmueller@phytec.de> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-MIMETrack: Itemize by SMTP Server on Idefix/Phytec(Release 9.0.1FP7|August 17, 2016) at 03.04.2020 15:07:28, Serialize by Router on Idefix/Phytec(Release 9.0.1FP7|August 17, 2016) at 03.04.2020 15:07:29 X-TNEFEvaluated: 1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBLMWRmVeSWpSXmKPExsWyRoCBS1fQtD3O4OUFNovLu+awWdxYt4/d 4snCM0wWe1svMls8fvmP2YHVY8UnfY+Va9aweuz83sDu8XmTXABLFJdNSmpOZllqkb5dAldG 77WtTAV3xCpu/v/B2sD4U6iLkZNDQsBEYu7ym0xdjFwcQgLbGCVuNR1nhXDOMUq8PPCBFaSK TcBIYsG0RrAqEYE2Rok9R2cxgiSYBRwkHs99CGYLC3hKvFwxnxnEZhFQkbg36TIbiM0rYCMx 88BLoGYOoHXyEocPZUGEBSVOznzCAjJTQuAKo8TH32vZIU4Skji9+CwzxHxtiWULXzNPYOSb haRnFpLUAkamVYxCuZnJ2alFmdl6BRmVJanJeimpmxiBoXd4ovqlHYx9czwOMTJxMB5ilOBg VhLhdZzRGifEm5JYWZValB9fVJqTWnyIUZqDRUmcdwNvSZiQQHpiSWp2ampBahFMlomDU6qB cd9prgUWp76IrJ4jtOvbvwfuZz5uyLRQNvWUsM5xyj96SWzSjFWJCY8jIquDhV2VvB4sCw9e +/v3HP2DCm0lrger9M57zH0k8fPaH/EFZkXWW+O8+Ou276+eE8pxmT0xrPaxsuRk1Y6GgvUu Ezuy3Cqb5CvtMkWrk7o3ftHsm7R07uUn/JMslViKMxINtZiLihMBt5iq1CsCAAA= Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org During probe try to set the timeout from device tree and fall back to either the pre-configured timeout set by e.g. the bootloader in case the watchdog is already running or the default value. If the watchdog is already running make sure to update the timeout and tell the framework about the running state to make sure the watchdog is handled correctly until user space takes over. Updating the timeout also removes the need for an additional manual ping so we can remove that as well. Signed-off-by: Stefan Riedmueller --- Changes in v2: - Reworked the patch to use the pre-configured timeout instead of the default value as a fallback in case no DT value is present. - To achieve the previous point watchdog_init_timeout was added to get the DT value if present. - Added a timeout update if the watchdog is running to set the desired timeout and in this instance removed the manual ping at the end. - Removed info message. --- drivers/watchdog/da9062_wdt.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c index 0ad15d55071c..10b37dd65bed 100644 --- a/drivers/watchdog/da9062_wdt.c +++ b/drivers/watchdog/da9062_wdt.c @@ -35,6 +35,15 @@ struct da9062_watchdog { bool use_sw_pm; }; +static unsigned int da9062_wdt_read_timeout(struct da9062_watchdog *wdt) +{ + unsigned int val; + + regmap_read(wdt->hw->regmap, DA9062AA_CONTROL_D, &val); + + return wdt_timeout[val & DA9062AA_TWDSCALE_MASK]; +} + static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs) { unsigned int i; @@ -183,7 +192,7 @@ MODULE_DEVICE_TABLE(of, da9062_compatible_id_table); static int da9062_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; - int ret; + unsigned int timeout; struct da9062 *chip; struct da9062_watchdog *wdt; @@ -213,11 +222,19 @@ static int da9062_wdt_probe(struct platform_device *pdev) watchdog_set_drvdata(&wdt->wdtdev, wdt); dev_set_drvdata(dev, &wdt->wdtdev); - ret = devm_watchdog_register_device(dev, &wdt->wdtdev); - if (ret < 0) - return ret; + timeout = da9062_wdt_read_timeout(wdt); + if (timeout) + wdt->wdtdev.timeout = timeout; + + /* Set timeout from DT value if available */ + watchdog_init_timeout(&wdt->wdtdev, 0, dev); + + if (timeout) { + da9062_wdt_set_timeout(&wdt->wdtdev, wdt->wdtdev.timeout); + set_bit(WDOG_HW_RUNNING, &wdt->wdtdev.status); + } - return da9062_wdt_ping(&wdt->wdtdev); + return devm_watchdog_register_device(dev, &wdt->wdtdev); } static int __maybe_unused da9062_wdt_suspend(struct device *dev)