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From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Viresh Kumar <viresh.kumar@linaro.org>, linux-pm@vger.kernel.org,
        Vincent Guittot <vincent.guittot@linaro.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH V3 12/20] OPP: Migrate set-clk-name API to use set-config helpers
Date:   Mon,  4 Jul 2022 17:37:50 +0530
Message-Id: <0ae7b982b4c87940a01d78200295f7bc66cb67f7.1656935522.git.viresh.kumar@linaro.org>
In-Reply-To: <cover.1656935522.git.viresh.kumar@linaro.org>
References: <cover.1656935522.git.viresh.kumar@linaro.org>
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Now that we have a central API to handle all OPP table configurations,
migrate the set-clk-name family of helpers to use the new
infrastructure.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/opp/core.c     | 142 +++++++++++++----------------------------
 include/linux/pm_opp.h |  41 +++++++-----
 2 files changed, 69 insertions(+), 114 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 8dbdfff38973..0a82ca7ae453 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2164,104 +2164,71 @@ static void _opp_put_regulators(struct opp_table *opp_table)
 }
 
 /**
- * dev_pm_opp_set_clkname() - Set clk name for the device
- * @dev: Device for which clk name is being set.
- * @name: Clk name.
- *
- * In order to support OPP switching, OPP layer needs to get pointer to the
- * clock for the device. Simple cases work fine without using this routine (i.e.
- * by passing connection-id as NULL), but for a device with multiple clocks
- * available, the OPP core needs to know the exact name of the clk to use.
+ * _opp_set_clknames() - Set clk names for the device
+ * @dev: Device for which clk names is being set.
+ * @names: Clk names.
+ *
+ * In order to support OPP switching, OPP layer needs to get pointers to the
+ * clocks for the device. Simple cases work fine without using this routine
+ * (i.e. by passing connection-id as NULL), but for a device with multiple
+ * clocks available, the OPP core needs to know the exact names of the clks to
+ * use.
  *
  * This must be called before any OPPs are initialized for the device.
  */
-struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
+static int _opp_set_clknames(struct opp_table *opp_table, struct device *dev,
+			     const char * const names[])
 {
-	struct opp_table *opp_table;
-	int ret;
+	const char * const *temp = names;
+	int count = 0;
 
-	opp_table = _add_opp_table(dev, false);
-	if (IS_ERR(opp_table))
-		return opp_table;
+	/* Count number of clks */
+	while (*temp++)
+		count++;
 
-	/* This should be called before OPPs are initialized */
-	if (WARN_ON(!list_empty(&opp_table->opp_list))) {
-		ret = -EBUSY;
-		goto err;
-	}
+	/*
+	 * This is a special case where we have a single clock, whose connection
+	 * id name is NULL, i.e. first two entries are NULL in the array.
+	 */
+	if (!count && !names[1])
+		count = 1;
+
+	/* We support only one clock name for now */
+	if (count != 1)
+		return -EINVAL;
 
 	/* Another CPU that shares the OPP table has set the clkname ? */
 	if (opp_table->clk_configured)
-		return opp_table;
+		return 0;
 
 	/* clk shouldn't be initialized at this point */
-	if (WARN_ON(opp_table->clk)) {
-		ret = -EBUSY;
-		goto err;
-	}
+	if (WARN_ON(opp_table->clk))
+		return -EBUSY;
 
 	/* Find clk for the device */
-	opp_table->clk = clk_get(dev, name);
+	opp_table->clk = clk_get(dev, names[0]);
 	if (IS_ERR(opp_table->clk)) {
-		ret = dev_err_probe(dev, PTR_ERR(opp_table->clk),
+		return dev_err_probe(dev, PTR_ERR(opp_table->clk),
 				    "%s: Couldn't find clock\n", __func__);
-		goto err;
 	}
 
 	opp_table->clk_configured = true;
 
-	return opp_table;
-
-err:
-	dev_pm_opp_put_opp_table(opp_table);
-
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
-
-/**
- * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
- * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
- */
-void dev_pm_opp_put_clkname(struct opp_table *opp_table)
-{
-	if (unlikely(!opp_table))
-		return;
-
-	clk_put(opp_table->clk);
-	opp_table->clk = ERR_PTR(-EINVAL);
-	opp_table->clk_configured = false;
-
-	dev_pm_opp_put_opp_table(opp_table);
-}
-EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
-
-static void devm_pm_opp_clkname_release(void *data)
-{
-	dev_pm_opp_put_clkname(data);
+	return 0;
 }
 
 /**
- * devm_pm_opp_set_clkname() - Set clk name for the device
- * @dev: Device for which clk name is being set.
- * @name: Clk name.
- *
- * This is a resource-managed variant of dev_pm_opp_set_clkname().
- *
- * Return: 0 on success and errorno otherwise.
+ * _opp_put_clknames() - Releases resources blocked for clks.
+ * @opp_table: OPP table returned from _opp_set_clknames().
  */
-int devm_pm_opp_set_clkname(struct device *dev, const char *name)
+static void _opp_put_clknames(struct opp_table *opp_table)
 {
-	struct opp_table *opp_table;
-
-	opp_table = dev_pm_opp_set_clkname(dev, name);
-	if (IS_ERR(opp_table))
-		return PTR_ERR(opp_table);
-
-	return devm_add_action_or_reset(dev, devm_pm_opp_clkname_release,
-					opp_table);
+	if (opp_table->clk_configured) {
+		clk_put(opp_table->clk);
+		opp_table->clk = ERR_PTR(-EINVAL);
+		opp_table->clk_configured = false;
+	}
 }
-EXPORT_SYMBOL_GPL(devm_pm_opp_set_clkname);
 
 /**
  * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
@@ -2544,7 +2511,7 @@ static void _opp_clear_config(struct opp_config_data *data)
 	if (data->flags & OPP_CONFIG_PROP_NAME)
 		dev_pm_opp_put_prop_name(data->opp_table);
 	if (data->flags & OPP_CONFIG_CLK)
-		dev_pm_opp_put_clkname(data->opp_table);
+		_opp_put_clknames(data->opp_table);
 
 	dev_pm_opp_put_opp_table(data->opp_table);
 	kfree(data);
@@ -2595,32 +2562,9 @@ int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
 
 	/* Configure clocks */
 	if (config->clk_names) {
-		const char * const *temp = config->clk_names;
-		int count = 0;
-
-		/* Count number of clks */
-		while (*temp++)
-			count++;
-
-		/*
-		 * This is a special case where we have a single clock, whose
-		 * connection id name is NULL, i.e. first two entries are NULL
-		 * in the array.
-		 */
-		if (!count && !config->clk_names[1])
-			count = 1;
-
-		/* We support only one clock name for now */
-		if (count != 1) {
-			ret = -EINVAL;
-			goto err;
-		}
-
-		err = dev_pm_opp_set_clkname(dev, config->clk_names[0]);
-		if (IS_ERR(err)) {
-			ret = PTR_ERR(err);
+		ret = _opp_set_clknames(opp_table, dev, config->clk_names);
+		if (ret)
 			goto err;
-		}
 
 		data->flags |= OPP_CONFIG_CLK;
 	}
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 94d0101c254c..ed1906bbe8bb 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -186,9 +186,6 @@ void dev_pm_opp_clear_config(int token);
 
 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
 void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
-struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name);
-void dev_pm_opp_put_clkname(struct opp_table *opp_table);
-int devm_pm_opp_set_clkname(struct device *dev, const char *name);
 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
 void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table);
 int devm_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
@@ -387,18 +384,6 @@ static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, con
 
 static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
 
-static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
-{
-	return ERR_PTR(-EOPNOTSUPP);
-}
-
-static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}
-
-static inline int devm_pm_opp_set_clkname(struct device *dev, const char *name)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char * const *names, struct device ***virt_devs)
 {
 	return ERR_PTR(-EOPNOTSUPP);
@@ -629,4 +614,30 @@ static inline int devm_pm_opp_set_supported_hw(struct device *dev,
 	return devm_pm_opp_set_config(dev, &config);
 }
 
+/* clkname helpers */
+static inline int dev_pm_opp_set_clkname(struct device *dev, const char *name)
+{
+	const char *names[] = { name, NULL };
+	struct dev_pm_opp_config config = {
+		.clk_names = names,
+	};
+
+	return dev_pm_opp_set_config(dev, &config);
+}
+
+static inline void dev_pm_opp_put_clkname(int token)
+{
+	dev_pm_opp_clear_config(token);
+}
+
+static inline int devm_pm_opp_set_clkname(struct device *dev, const char *name)
+{
+	const char *names[] = { name, NULL };
+	struct dev_pm_opp_config config = {
+		.clk_names = names,
+	};
+
+	return devm_pm_opp_set_config(dev, &config);
+}
+
 #endif		/* __LINUX_OPP_H__ */
-- 
2.31.1.272.g89b43f80a514