From patchwork Wed Feb 23 16:01:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 545853 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CDB0C433EF for ; Wed, 23 Feb 2022 16:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240645AbiBWQGw (ORCPT ); Wed, 23 Feb 2022 11:06:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240492AbiBWQGu (ORCPT ); Wed, 23 Feb 2022 11:06:50 -0500 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id AC5D6C4850 for ; Wed, 23 Feb 2022 08:06:22 -0800 (PST) X-IronPort-AV: E=Sophos;i="5.88,391,1635174000"; d="scan'208";a="111356446" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 24 Feb 2022 01:01:21 +0900 Received: from localhost.localdomain (unknown [10.226.93.140]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id D249E4004923; Thu, 24 Feb 2022 01:01:18 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck , Philipp Zabel Cc: Biju Das , linux-watchdog@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH v4 6/6] watchdog: rzg2l_wdt: Add set_timeout callback Date: Wed, 23 Feb 2022 16:01:00 +0000 Message-Id: <20220223160100.23543-7-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> References: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org This patch adds support for set_timeout callback. Once WDT is started, the WDT cycle setting register(WDTSET) can be updated only after issuing a module reset. Otherwise, it will ignore the writes and will hold the previous value. This patch updates the WDTSET register if it is active. Signed-off-by: Biju Das --- V3->v4: * Updated commit description * Simplified the logic for updating timeout register, if wdt is active. v2->v3: * Patch reodering Patch 3 -> patch 4 * Updated commit description. V1->V2: * Updated commit description * Removed stop/start and started using reset() instead. * After reset, Start WDT based on watchdog timer state. --- drivers/watchdog/rzg2l_wdt.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 4e7107655cc2..6eea0ee4af49 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -115,6 +115,25 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) return 0; } +static int rzg2l_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout) +{ + struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); + + wdev->timeout = timeout; + + /* + * If the watchdog is active, reset the module for updating the WDTSET + * register so that it is updated with new timeout values. + */ + if (watchdog_active(wdev)) { + pm_runtime_put(wdev->parent); + reset_control_reset(priv->rstc); + rzg2l_wdt_start(wdev); + } + + return 0; +} + static int rzg2l_wdt_restart(struct watchdog_device *wdev, unsigned long action, void *data) { @@ -151,6 +170,7 @@ static const struct watchdog_ops rzg2l_wdt_ops = { .start = rzg2l_wdt_start, .stop = rzg2l_wdt_stop, .ping = rzg2l_wdt_ping, + .set_timeout = rzg2l_wdt_set_timeout, .restart = rzg2l_wdt_restart, };