From patchwork Wed Jan 31 10:20:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu X-Patchwork-Id: 770083 Received: from mail-ed1-f49.google.com (mail-ed1-f49.google.com [209.85.208.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 55AEB6EB50 for ; Wed, 31 Jan 2024 10:20:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706696439; cv=none; b=I7+2f8zjdlKs6giBFA3fvjK7KF3omjPGCI94LlD4t23/RyLui9Bf0MduJ7cx/YiXAzt5KgmnxWxn//mx68mqCwlMHFiqK723jvfg7nFUU+jH/jIudqIYWKRzFc0gfHdUuzCcnD4MYvTKvjdHhMG3uM7DDaOYbgcvNfAoAMMIuQI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706696439; c=relaxed/simple; bh=sQDbOUHSkc20XDneBfwuR876rxx6hocXRG53pgHnEa4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ge06iK+qjPE2NCw5lZ07LVhhl5ksZ7DgUo/gbrFhXwlOZGY7NeNdfllhxl6pTdAaqi78gICY5rjzrcjUhaCTUQBwA1drohJqKFn+zqXs1OKQzbhN5vyc6d6EgeCe106SqES7f+XXODVe9nmVr25y5It84F9YVbIKIYbkKBf3Qos= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev; spf=pass smtp.mailfrom=tuxon.dev; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b=qVpoD5Q3; arc=none smtp.client-ip=209.85.208.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b="qVpoD5Q3" Received: by mail-ed1-f49.google.com with SMTP id 4fb4d7f45d1cf-558f523c072so6172170a12.2 for ; Wed, 31 Jan 2024 02:20:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxon.dev; s=google; t=1706696435; x=1707301235; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Ooh9H1my4f9HBXDuCfxTg/WHENrkeAM2CEvky+dksH0=; b=qVpoD5Q3TRqiH+ZJSwQBThNtv5vgIwJ+Gvcpby+huenLkkRYTMtTNaSA21LMRiAmDh 0oJiTfnCRbnr2jBJ33RjF0AZd4QMIX9OIHTAmr04ClXgyEW+54EAi5mvoIlrj8+3nK+k S0wmtTTq3phsxkpORZfO2r9fga8KdEzQPLWtUpNcWU6qGO4v/d/e7HBaojLsahLPNUWz htZkuqRL3duzQjiNooRKqFGBi9xoHEwyGwSRSBE3niD1LU5VUnSyQihpZyitNPlXoe6T n07hC1ghIjvlmIR0ftvHUB/lBUabZ9ixW6q5y1IdJne1YyaYM/vf/Ez+Ly3L68GD/u99 C+4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706696435; x=1707301235; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Ooh9H1my4f9HBXDuCfxTg/WHENrkeAM2CEvky+dksH0=; b=I84NxDvVHKUWWXeYR0ATSKbKXU5uEpxl9HMu4UAQBSHdTHNEaOTX4dEH9eKpDucUsq 929H4NbbBsiBAYVcFBXLApay+q9joVcL/f3nBKhva2496S/1z1ELQ6W2c3J1oVYs5T/D OtgLhCnfiogSsTAn8Ub+6bbHwwr2RPJMQeD8E7QKSQzYEpATktLNyXpGZvNIbUkw5WiD oPGFIOJsbhD6kK4aPx/DUctRtO+64a8RI97B3WP6YTWSsWUX13FGP3+gwOC++RIuSgyl eaFMT1mlUX6e4lp4lW0j0TeR0No1uvh+gB1I1dkOho7ddYjRmAjhfnYQDRJGX/l/jA7Y vPpw== X-Gm-Message-State: AOJu0Yz5aEQHS3VKr7HfOpNyLPwtDelKYC7frLKEEnL/g9ogtJR4O4FQ Dj6T4Avx096Yevx9rC1arFnegxOxPDzmqf7s35/xJYMTrLHD81tzLB/8UpJnDbc= X-Google-Smtp-Source: AGHT+IHvRNc192jUA4iCLjsij/+OOxRCokcwE5ef++xOMh5pD2E5JacvZcBHYDJhFIRu0L+TCjp3UA== X-Received: by 2002:a17:906:3598:b0:a36:3d9d:59e4 with SMTP id o24-20020a170906359800b00a363d9d59e4mr877872ejb.64.1706696435441; Wed, 31 Jan 2024 02:20:35 -0800 (PST) X-Forwarded-Encrypted: i=0; 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 Received: from claudiu-X670E-Pro-RS.. ([82.78.167.87]) by smtp.gmail.com with ESMTPSA id vk6-20020a170907cbc600b00a3524be5a86sm5212966ejc.103.2024.01.31.02.20.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Jan 2024 02:20:35 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: wim@linux-watchdog.org, linux@roeck-us.net, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, geert+renesas@glider.be, magnus.damm@gmail.com, mturquette@baylibre.com, sboyd@kernel.org, p.zabel@pengutronix.de, biju.das.jz@bp.renesas.com Cc: linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, claudiu.beznea@tuxon.dev, Claudiu Beznea Subject: [PATCH v2 05/11] watchdog: rzg2l_wdt: Remove reset de-assert on probe/stop Date: Wed, 31 Jan 2024 12:20:11 +0200 Message-Id: <20240131102017.1841495-6-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240131102017.1841495-1-claudiu.beznea.uj@bp.renesas.com> References: <20240131102017.1841495-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea There is no need to de-assert the reset signal on probe as the watchdog is not used prior executing start. Also, the clocks are not enabled in probe (pm_runtime_enable() doesn't do that), thus this is another indicator that the watchdog wasn't used previously like this. Instead, keep the watchdog hardware in its previous state at probe (by default it is in reset state), enable it when it is started and move it to reset state when it is stopped. This saves some extra power when the watchdog is unused. Signed-off-by: Claudiu Beznea --- Changes in v2: - none drivers/watchdog/rzg2l_wdt.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 7bce093316c4..93a49fd0c7aa 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -129,6 +129,10 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev) if (ret) return ret; + ret = reset_control_deassert(priv->rstc); + if (ret) + return ret; + /* Initialize time out */ rzg2l_wdt_init_timeout(wdev); @@ -146,7 +150,9 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); int ret; - rzg2l_wdt_reset(priv); + ret = reset_control_assert(priv->rstc); + if (ret) + return ret; ret = pm_runtime_put(wdev->parent); if (ret < 0) @@ -186,6 +192,12 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev, clk_prepare_enable(priv->osc_clk); if (priv->devtype == WDT_RZG2L) { + int ret; + + ret = reset_control_deassert(priv->rstc); + if (ret) + return ret; + /* Generate Reset (WDTRSTB) Signal on parity error */ rzg2l_wdt_write(priv, 0, PECR); @@ -236,13 +248,11 @@ static const struct watchdog_ops rzg2l_wdt_ops = { .restart = rzg2l_wdt_restart, }; -static void rzg2l_wdt_reset_assert_pm_disable(void *data) +static void rzg2l_wdt_pm_disable(void *data) { struct watchdog_device *wdev = data; - struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); pm_runtime_disable(wdev->parent); - reset_control_assert(priv->rstc); } static int rzg2l_wdt_probe(struct platform_device *pdev) @@ -285,10 +295,6 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc), "failed to get cpg reset"); - ret = reset_control_deassert(priv->rstc); - if (ret) - return dev_err_probe(dev, ret, "failed to deassert"); - priv->devtype = (uintptr_t)of_device_get_match_data(dev); if (priv->devtype == WDT_RZV2M) { @@ -309,9 +315,7 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) priv->wdev.timeout = WDT_DEFAULT_TIMEOUT; watchdog_set_drvdata(&priv->wdev, priv); - ret = devm_add_action_or_reset(&pdev->dev, - rzg2l_wdt_reset_assert_pm_disable, - &priv->wdev); + ret = devm_add_action_or_reset(&pdev->dev, rzg2l_wdt_pm_disable, &priv->wdev); if (ret < 0) return ret;