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From:   Dmitry Osipenko <digetx@gmail.com>
To:     Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Georgi Djakov <georgi.djakov@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        MyungJoo Ham <myungjoo.ham@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Mikko Perttunen <cyndis@kapsi.fi>,
        Viresh Kumar <vireshk@kernel.org>,
        Peter Geis <pgwipeout@gmail.com>,
        Nicolas Chauvet <kwizart@gmail.com>,
        Krzysztof Kozlowski <krzk@kernel.org>
Cc:     linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH v8 10/26] memory: tegra30-emc: Factor out clk initialization
Date:   Wed, 11 Nov 2020 04:14:40 +0300
Message-Id: <20201111011456.7875-11-digetx@gmail.com>
In-Reply-To: <20201111011456.7875-1-digetx@gmail.com>
References: <20201111011456.7875-1-digetx@gmail.com>
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Factor out clk initialization and make it resource-managed. This makes
easier to follow code and will help to make further changes cleaner.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/memory/tegra/tegra30-emc.c | 70 ++++++++++++++++++++----------
 1 file changed, 47 insertions(+), 23 deletions(-)

diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c
index d27df842a667..1df42e212d73 100644
--- a/drivers/memory/tegra/tegra30-emc.c
+++ b/drivers/memory/tegra/tegra30-emc.c
@@ -1550,6 +1550,49 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)
 	return err;
 }
 
+static void devm_tegra_emc_unset_callback(void *data)
+{
+	tegra20_clk_set_emc_round_callback(NULL, NULL);
+}
+
+static void devm_tegra_emc_unreg_clk_notifier(void *data)
+{
+	struct tegra_emc *emc = data;
+
+	clk_notifier_unregister(emc->clk, &emc->clk_nb);
+}
+
+static int tegra_emc_init_clk(struct tegra_emc *emc)
+{
+	int err;
+
+	tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
+
+	err = devm_add_action_or_reset(emc->dev, devm_tegra_emc_unset_callback,
+				       NULL);
+	if (err)
+		return err;
+
+	emc->clk = devm_clk_get(emc->dev, NULL);
+	if (IS_ERR(emc->clk)) {
+		dev_err(emc->dev, "failed to get EMC clock: %pe\n", emc->clk);
+		return PTR_ERR(emc->clk);
+	}
+
+	err = clk_notifier_register(emc->clk, &emc->clk_nb);
+	if (err) {
+		dev_err(emc->dev, "failed to register clk notifier: %d\n", err);
+		return err;
+	}
+
+	err = devm_add_action_or_reset(emc->dev,
+				       devm_tegra_emc_unreg_clk_notifier, emc);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static int tegra_emc_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
@@ -1599,25 +1642,13 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
-
-	emc->clk = devm_clk_get(&pdev->dev, "emc");
-	if (IS_ERR(emc->clk)) {
-		err = PTR_ERR(emc->clk);
-		dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
-		goto unset_cb;
-	}
-
-	err = clk_notifier_register(emc->clk, &emc->clk_nb);
-	if (err) {
-		dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
-			err);
-		goto unset_cb;
-	}
+	err = tegra_emc_init_clk(emc);
+	if (err)
+		return err;
 
 	err = tegra_emc_opp_table_init(emc);
 	if (err)
-		goto unreg_notifier;
+		return err;
 
 	platform_set_drvdata(pdev, emc);
 	tegra_emc_rate_requests_init(emc);
@@ -1632,13 +1663,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
 	try_module_get(THIS_MODULE);
 
 	return 0;
-
-unreg_notifier:
-	clk_notifier_unregister(emc->clk, &emc->clk_nb);
-unset_cb:
-	tegra20_clk_set_emc_round_callback(NULL, NULL);
-
-	return err;
 }
 
 static int tegra_emc_suspend(struct device *dev)
-- 
2.29.2