From patchwork Tue Jan 4 18:12:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 529996 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 E29C0C433F5 for ; Tue, 4 Jan 2022 18:12:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236130AbiADSMr (ORCPT ); Tue, 4 Jan 2022 13:12:47 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:15298 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236124AbiADSMr (ORCPT ); Tue, 4 Jan 2022 13:12:47 -0500 X-IronPort-AV: E=Sophos;i="5.88,261,1635174000"; d="scan'208";a="106015088" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 05 Jan 2022 03:12:46 +0900 Received: from localhost.localdomain (unknown [10.226.92.30]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id A949440BB06D; Wed, 5 Jan 2022 03:12:44 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck 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 v3 3/4] watchdog: rzg2l_wdt: Add error check for reset_control_deassert Date: Tue, 4 Jan 2022 18:12:47 +0000 Message-Id: <20220104181249.3174-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220104181249.3174-1-biju.das.jz@bp.renesas.com> References: <20220104181249.3174-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org If reset_control_deassert() fails, then we won't be able to access the device registers. Therefore check the return code of reset_control_deassert() and bail out in case of error. Remove the reset_control_deassert() from rzg2l_wdt_start() as it already deasserted in probe() and replace reset_control_assert()-> reset_control_reset() in rzg2l_wdt_stop(). While at it remove the unnecessary pm_runtime_resume_and_get() from probe(), as it turns on the clocks. Signed-off-by: Biju Das --- v2->v3: * Patch reordering from Patch 2 -> Patch 3 * Updated commit description v1->v2: * Updated commit description and removed Rb tag from Guenter, since there is code change * Replaced reset_control_assert with reset_control_reset in stop and removed reset_control_deassert() from start. --- drivers/watchdog/rzg2l_wdt.c | 26 ++++++++------------------ 1 file changed, 8 insertions(+), 18 deletions(-) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index b02ecfff5299..024e7bf796c6 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -89,7 +89,6 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev) { struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - reset_control_deassert(priv->rstc); pm_runtime_get_sync(wdev->parent); /* Initialize time out */ @@ -109,9 +108,9 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); pm_runtime_put(wdev->parent); - reset_control_assert(priv->rstc); - return 0; + /* Reset the module for stopping watchdog */ + return reset_control_reset(priv->rstc); } static int rzg2l_wdt_restart(struct watchdog_device *wdev, @@ -150,12 +149,11 @@ static const struct watchdog_ops rzg2l_wdt_ops = { .restart = rzg2l_wdt_restart, }; -static void rzg2l_wdt_reset_assert_pm_disable_put(void *data) +static void rzg2l_wdt_reset_assert_pm_disable(void *data) { struct watchdog_device *wdev = data; struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - pm_runtime_put(wdev->parent); pm_runtime_disable(wdev->parent); reset_control_assert(priv->rstc); } @@ -203,13 +201,11 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc), "failed to get cpg reset"); - reset_control_deassert(priv->rstc); + ret = reset_control_deassert(priv->rstc); + if (ret) + return dev_err_probe(dev, ret, "failed to deassert"); + pm_runtime_enable(&pdev->dev); - ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) { - dev_err(dev, "pm_runtime_resume_and_get failed ret=%pe", ERR_PTR(ret)); - goto out_pm_get; - } priv->wdev.info = &rzg2l_wdt_ident; priv->wdev.ops = &rzg2l_wdt_ops; @@ -221,7 +217,7 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) watchdog_set_drvdata(&priv->wdev, priv); ret = devm_add_action_or_reset(&pdev->dev, - rzg2l_wdt_reset_assert_pm_disable_put, + rzg2l_wdt_reset_assert_pm_disable, &priv->wdev); if (ret < 0) return ret; @@ -234,12 +230,6 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) dev_warn(dev, "Specified timeout invalid, using default"); return devm_watchdog_register_device(&pdev->dev, &priv->wdev); - -out_pm_get: - pm_runtime_disable(dev); - reset_control_assert(priv->rstc); - - return ret; } static const struct of_device_id rzg2l_wdt_ids[] = {