linux-kernel - [PATCH 5/7] regulator: act8865: Pass of_node via act8865_regulator

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Message-Id: <1456674809-16422-5-git-send-email-maarten@treewalker.org>
Date:	Sun, 28 Feb 2016 16:53:27 +0100
From:	Maarten ter Huurne <maarten@...ewalker.org>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	Maarten ter Huurne <maarten@...ewalker.org>
Subject: [PATCH 5/7] regulator: act8865: Pass of_node via act8865_regulator_data

This makes the code easier to read and it avoids a dynamic memory
allocation.

Note that the "too many regulators" error handler was broken prior
to its removal in this commit, since it dereferenced pdata, which
can be NULL in the non-DT case.

Signed-off-by: Maarten ter Huurne <maarten@...ewalker.org>
---
 drivers/regulator/act8865-regulator.c | 42 +++++++++++++----------------------
 include/linux/regulator/act8865.h     |  2 ++
 2 files changed, 18 insertions(+), 26 deletions(-)

diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c
index 0d1b235..cdfe082 100644
--- a/drivers/regulator/act8865-regulator.c
+++ b/drivers/regulator/act8865-regulator.c
@@ -368,7 +368,6 @@ static struct of_regulator_match act8600_matches[] = {
 };
 
 static int act8865_pdata_from_dt(struct device *dev,
-				 struct device_node **of_node,
 				 struct act8865_platform_data *pdata,
 				 unsigned long type)
 {
@@ -419,7 +418,7 @@ static int act8865_pdata_from_dt(struct device *dev,
 		regulator->id = i;
 		regulator->name = matches[i].name;
 		regulator->init_data = matches[i].init_data;
-		of_node[i] = matches[i].of_node;
+		regulator->of_node = matches[i].of_node;
 		regulator++;
 	}
 
@@ -427,7 +426,6 @@ static int act8865_pdata_from_dt(struct device *dev,
 }
 #else
 static inline int act8865_pdata_from_dt(struct device *dev,
-					struct device_node **of_node,
 					struct act8865_platform_data *pdata,
 					unsigned long type)
 {
@@ -435,8 +433,8 @@ static inline int act8865_pdata_from_dt(struct device *dev,
 }
 #endif
 
-static struct regulator_init_data
-*act8865_get_init_data(int id, struct act8865_platform_data *pdata)
+static struct act8865_regulator_data *act8865_get_regulator_data(
+		int id, struct act8865_platform_data *pdata)
 {
 	int i;
 
@@ -445,7 +443,7 @@ static struct regulator_init_data
 
 	for (i = 0; i < pdata->num_regulators; i++) {
 		if (pdata->regulators[i].id == id)
-			return pdata->regulators[i].init_data;
+			return &pdata->regulators[i];
 	}
 
 	return NULL;
@@ -467,7 +465,6 @@ static int act8865_pmic_probe(struct i2c_client *client,
 	const struct regulator_desc *regulators;
 	struct act8865_platform_data pdata_of, *pdata;
 	struct device *dev = &client->dev;
-	struct device_node **of_node;
 	int i, ret, num_regulators;
 	struct act8865 *act8865;
 	struct regmap_config regmap_config = {
@@ -531,25 +528,14 @@ static int act8865_pmic_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
-			       num_regulators, GFP_KERNEL);
-	if (!of_node)
-		return -ENOMEM;
-
 	if (dev->of_node && !pdata) {
-		ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, type);
+		ret = act8865_pdata_from_dt(dev, &pdata_of, type);
 		if (ret < 0)
 			return ret;
 
 		pdata = &pdata_of;
 	}
 
-	if (pdata->num_regulators > num_regulators) {
-		dev_err(dev, "too many regulators: %d\n",
-			pdata->num_regulators);
-		return -EINVAL;
-	}
-
 	act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
 	if (!act8865)
 		return -ENOMEM;
@@ -575,14 +561,19 @@ static int act8865_pmic_probe(struct i2c_client *client,
 	/* Finally register devices */
 	for (i = 0; i < num_regulators; i++) {
 		const struct regulator_desc *desc = &regulators[i];
-		struct regulator_config config = { };
+		struct regulator_config config = {
+			.dev = dev,
+			.regmap = act8865->regmap,
+			.driver_data = act8865,
+		};
+		struct act8865_regulator_data *rdata;
 		struct regulator_dev *rdev;
 
-		config.dev = dev;
-		config.init_data = act8865_get_init_data(desc->id, pdata);
-		config.of_node = of_node[i];
-		config.driver_data = act8865;
-		config.regmap = act8865->regmap;
+		rdata = act8865_get_regulator_data(desc->id, pdata);
+		if (rdata) {
+			config.init_data = rdata->init_data;
+			config.of_node = rdata->of_node;
+		}
 
 		rdev = devm_regulator_register(dev, desc, &config);
 		if (IS_ERR(rdev)) {
@@ -592,7 +583,6 @@ static int act8865_pmic_probe(struct i2c_client *client,
 	}
 
 	i2c_set_clientdata(client, act8865);
-	devm_kfree(dev, of_node);
 
 	return 0;
 }
diff --git a/include/linux/regulator/act8865.h b/include/linux/regulator/act8865.h
index 2eb3860..113d861 100644
--- a/include/linux/regulator/act8865.h
+++ b/include/linux/regulator/act8865.h
@@ -69,11 +69,13 @@ enum {
  * @id: regulator id
  * @name: regulator name
  * @init_data: regulator init data
+ * @of_node: device tree node (optional)
  */
 struct act8865_regulator_data {
 	int id;
 	const char *name;
 	struct regulator_init_data *init_data;
+	struct device_node *of_node;
 };
 
 /**
-- 
2.6.2