diff mbox

[v4,5/6] extcon: add possibility to get extcon device by OF node

Message ID 20180221085541.14556-6-a.hajda@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrzej Hajda Feb. 21, 2018, 8:55 a.m. UTC 
Since extcon property is not allowed in DT, extcon subsystem requires
another way to get extcon device. Lets try the simplest approach - get
edev by of_node.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
---
v2: changed label to follow local convention (Chanwoo)
---
 drivers/extcon/extcon.c | 44 ++++++++++++++++++++++++++++++++++----------
 include/linux/extcon.h  |  6 ++++++
 2 files changed, 40 insertions(+), 10 deletions(-)

Comments

Andy Shevchenko Feb. 21, 2018, 2:27 p.m. UTC | #1 
On Wed, Feb 21, 2018 at 10:55 AM, Andrzej Hajda <a.hajda@samsung.com> wrote:
> Since extcon property is not allowed in DT, extcon subsystem requires
> another way to get extcon device. Lets try the simplest approach - get
> edev by of_node.

> +/*
> + * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
> + * @node       : OF node identyfying edev
> + *
> + * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
> + */
> +struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)

First of all, the all other similar cases use "_by_node" in the name.
Second, it's not _get_, it's _find_.

> +{
> +       struct extcon_dev *edev;
> +
> +       mutex_lock(&extcon_dev_list_lock);
> +       list_for_each_entry(edev, &extcon_dev_list, entry)
> +               if (edev->dev.parent && edev->dev.parent->of_node == node)
> +                       goto out;
> +       edev = ERR_PTR(-EPROBE_DEFER);
> +out:
> +       mutex_unlock(&extcon_dev_list_lock);
> +
> +       return edev;

Can't it be done using bus_find_device()?

> +}

See good example in i2c-core-of.c

of_find_i2c_adapter_by_node()
of_get_i2c_adapter_by_node()
Andrzej Hajda Feb. 21, 2018, 3:54 p.m. UTC | #2 
On 21.02.2018 15:27, Andy Shevchenko wrote:
> On Wed, Feb 21, 2018 at 10:55 AM, Andrzej Hajda <a.hajda@samsung.com> wrote:
>> Since extcon property is not allowed in DT, extcon subsystem requires
>> another way to get extcon device. Lets try the simplest approach - get
>> edev by of_node.
>> +/*
>> + * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
>> + * @node       : OF node identyfying edev
>> + *
>> + * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
>> + */
>> +struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
> First of all, the all other similar cases use "_by_node" in the name.

OK, looks better.

> Second, it's not _get_, it's _find_.

The patch splits exisiting extcon_get_edev_by_phandle function into two
functions, nothing more.
Thus it followed naming convention present in extcon framework. I can
switch it of course to _find_.

>
>> +{
>> +       struct extcon_dev *edev;
>> +
>> +       mutex_lock(&extcon_dev_list_lock);
>> +       list_for_each_entry(edev, &extcon_dev_list, entry)
>> +               if (edev->dev.parent && edev->dev.parent->of_node == node)
>> +                       goto out;
>> +       edev = ERR_PTR(-EPROBE_DEFER);
>> +out:
>> +       mutex_unlock(&extcon_dev_list_lock);
>> +
>> +       return edev;
> Can't it be done using bus_find_device()?

There is no special extcon bus, so I am not sure. Anyway if it can, it
should be done probably in another patch.

Regards
Andrzej
diff mbox

Patch

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index cb38c2747684..c4972c4cb3bd 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -1336,6 +1336,28 @@  void extcon_dev_unregister(struct extcon_dev *edev)
 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
 
 #ifdef CONFIG_OF
+
+/*
+ * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
+ * @node	: OF node identyfying edev
+ *
+ * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
+ */
+struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
+{
+	struct extcon_dev *edev;
+
+	mutex_lock(&extcon_dev_list_lock);
+	list_for_each_entry(edev, &extcon_dev_list, entry)
+		if (edev->dev.parent && edev->dev.parent->of_node == node)
+			goto out;
+	edev = ERR_PTR(-EPROBE_DEFER);
+out:
+	mutex_unlock(&extcon_dev_list_lock);
+
+	return edev;
+}
+
 /*
  * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
  * @dev		: the instance to the given device
@@ -1363,25 +1385,27 @@  struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
 		return ERR_PTR(-ENODEV);
 	}
 
-	mutex_lock(&extcon_dev_list_lock);
-	list_for_each_entry(edev, &extcon_dev_list, entry) {
-		if (edev->dev.parent && edev->dev.parent->of_node == node) {
-			mutex_unlock(&extcon_dev_list_lock);
-			of_node_put(node);
-			return edev;
-		}
-	}
-	mutex_unlock(&extcon_dev_list_lock);
+	edev = extcon_get_edev_by_of_node(node);
 	of_node_put(node);
 
-	return ERR_PTR(-EPROBE_DEFER);
+	return edev;
 }
+
 #else
+
+struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
 {
 	return ERR_PTR(-ENOSYS);
 }
+
 #endif /* CONFIG_OF */
+
+EXPORT_SYMBOL_GPL(extcon_get_edev_by_of_node);
 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
 
 /**
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index 6d94e82c8ad9..b47e0c7f01fe 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -230,6 +230,7 @@  extern void devm_extcon_unregister_notifier_all(struct device *dev,
  * Following APIs get the extcon_dev from devicetree or by through extcon name.
  */
 extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
+extern struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node);
 extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 						     int index);
 
@@ -283,6 +284,11 @@  static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 				int index)
 {