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device property: Add fwnode_graph_get_port_parent

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Provide a helper to obtain the parent device fwnode without first
parsing the remote-endpoint as per fwnode_graph_get_remote_port_parent.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
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:
Kieran Bingham 2017-06-06 12:37:41 +03:00 committed by Rafael J. Wysocki
parent 125ee6b3b0
commit 6a71d8d777
2 changed files with 26 additions and 4 deletions
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28
drivers/base/property.c
View File

@ -1170,6 +1170,26 @@ fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
/**
* fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
* @endpoint: Endpoint firmware node of the port
*
* Return: the firmware node of the device the @endpoint belongs to.
*/
struct fwnode_handle *
fwnode_graph_get_port_parent(struct fwnode_handle *endpoint)
{
struct fwnode_handle *port, *parent;
port = fwnode_get_parent(endpoint);
parent = fwnode_call_ptr_op(port, graph_get_port_parent);
fwnode_handle_put(port);
return parent;
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
/**
* fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
* @fwnode: Endpoint firmware node pointing to the remote endpoint
@ -1179,12 +1199,12 @@ EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
struct fwnode_handle *
fwnode_graph_get_remote_port_parent(struct fwnode_handle *fwnode)
{
struct fwnode_handle *port, *parent;
struct fwnode_handle *endpoint, *parent;
port = fwnode_graph_get_remote_port(fwnode);
parent = fwnode_call_ptr_op(port, graph_get_port_parent);
endpoint = fwnode_graph_get_remote_endpoint(fwnode);
parent = fwnode_graph_get_port_parent(endpoint);
fwnode_handle_put(port);
fwnode_handle_put(endpoint);
return parent;
}

2
include/linux/property.h
View File

@ -275,6 +275,8 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen);
struct fwnode_handle *fwnode_graph_get_next_endpoint(
struct fwnode_handle *fwnode, struct fwnode_handle *prev);
struct fwnode_handle *
fwnode_graph_get_port_parent(struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port_parent(
struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port(