[PATCH 07/15] device property: Add fwnode_handle_get()

Sakari Ailus
2017-01-27T16:08:11Z

fwnode_handle_get() is used to obtain a reference to a fwnode_handle
container. In this case this is OF specific struct device_node.

This complements fwnode_handle_put() which is already implemented.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
drivers/base/property.c | 11 +++++++++++
include/linux/property.h | 1 +
2 files changed, 12 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index cf602c3..51c0881 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -976,6 +976,17 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
EXPORT_SYMBOL_GPL(device_get_named_child_node);

/**
+ * fwnode_handle_get - Obtain a reference to a device node
+ * @fwnode: Pointer to the device node to obtain the reference to.
+ */
+void fwnode_handle_get(struct fwnode_handle *fwnode)
+{
+ if (is_of_node(fwnode))
+ of_node_get(to_of_node(fwnode));
+}
+EXPORT_SYMBOL_GPL(fwnode_handle_get);
+
+/**
* fwnode_handle_put - Drop reference to a device node
* @fwnode: Pointer to the device node to drop the reference to.
*
diff --git a/include/linux/property.h b/include/linux/property.h
index 86c47ad..b4b1545 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -90,6 +90,7 @@ struct fwnode_handle *fwnode_get_named_child_node(struct fwnode_handle *fwnode,
struct fwnode_handle *device_get_named_child_node(struct device *dev,
const char *childname);

+void fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);

unsigned int device_get_child_node_count(struct device *dev);
--
2.7.4