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device property: Add fwnode_handle_get()

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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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2017-03-28 10:52:22 +03:00 committed by Rafael J. Wysocki
parent 07bb80d40b
commit e7887c2849
2 changed files with 12 additions and 0 deletions
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11
drivers/base/property.c
View file

@ -1040,6 +1040,17 @@ 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.

1
include/linux/property.h
View file

@ -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);