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Commit afaf26fd authored by Mika Westerberg's avatar Mika Westerberg Committed by Rafael J. Wysocki
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device property: Add fwnode_get_parent() 



Now that ACPI has support for returning parent firmware node for both types
of nodes we can expose this to others as well. This adds a new function
fwnode_get_parent() that can be used for DT and ACPI nodes to retrieve the
parent firmware node.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent dfa672fb

drivers/base/property.c

+25 −0
Original line number Diff line number Diff line
@@ -931,6 +931,31 @@ int device_add_properties(struct device *dev, 
}

EXPORT_SYMBOL_GPL(device_add_properties);



/**

 * fwnode_get_parent - Return parent firwmare node

 * @fwnode: Firmware whose parent is retrieved

 *

 * Return parent firmware node of the given node if possible or %NULL if no

 * parent was available.

 */

struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode)

{

	struct fwnode_handle *parent = NULL;



	if (is_of_node(fwnode)) {

		struct device_node *node;



		node = of_get_parent(to_of_node(fwnode));

		if (node)

			parent = &node->fwnode;

	} else if (is_acpi_node(fwnode)) {

		parent = acpi_node_get_parent(fwnode);

	}



	return parent;

}

EXPORT_SYMBOL_GPL(fwnode_get_parent);



/**

 * device_get_next_child_node - Return the next child node handle for a device

 * @dev: Device to find the next child node for.

include/linux/property.h

+2 −0
Original line number Diff line number Diff line
@@ -70,6 +70,8 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode, 
int fwnode_property_match_string(struct fwnode_handle *fwnode,

				 const char *propname, const char *string);



struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode);



struct fwnode_handle *device_get_next_child_node(struct device *dev,

						 struct fwnode_handle *child);