device property: Add fwnode_handle_get()

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>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4e98a6fad33fc812a9db005cce90d62e64a61fe8..23514bf679338fda9f236445ad9004e6e39fb607 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -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.

diff --git a/include/linux/property.h b/include/linux/property.h
index 8d7809c2c42df7c62f994d5b5ef537f9c594027f..0ae7d209f6c2b9d88d8d91d14cfd05118029c8e4 100644 (file)
--- 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);