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device property: Add FW type agnostic fwnode_graph_get_remote_node

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Add fwnode_graph_get_remote_node() function which is equivalent to
of_graph_get_remote_node() on OF.

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 2017-06-06 12:37:40 +03:00 committed by Rafael J. Wysocki
parent 2294b3af05
commit 125ee6b3b0
2 changed files with 39 additions and 0 deletions
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37
drivers/base/property.c
View File

@ -1215,6 +1215,43 @@ fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode)
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
/**
* fwnode_graph_get_remote_node - get remote parent node for given port/endpoint
* @fwnode: pointer to parent fwnode_handle containing graph port/endpoint
* @port_id: identifier of the parent port node
* @endpoint_id: identifier of the endpoint node
*
* Return: Remote fwnode handle associated with remote endpoint node linked
* to @node. Use fwnode_node_put() on it when done.
*/
struct fwnode_handle *fwnode_graph_get_remote_node(struct fwnode_handle *fwnode,
u32 port_id, u32 endpoint_id)
{
struct fwnode_handle *endpoint = NULL;
while ((endpoint = fwnode_graph_get_next_endpoint(fwnode, endpoint))) {
struct fwnode_endpoint fwnode_ep;
struct fwnode_handle *remote;
int ret;
ret = fwnode_graph_parse_endpoint(endpoint, &fwnode_ep);
if (ret < 0)
continue;
if (fwnode_ep.port != port_id || fwnode_ep.id != endpoint_id)
continue;
remote = fwnode_graph_get_remote_port_parent(endpoint);
if (!remote)
return NULL;
return fwnode_device_is_available(remote) ? remote : NULL;
}
return NULL;
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_node);
/**
* fwnode_graph_parse_endpoint - parse common endpoint node properties
* @fwnode: pointer to endpoint fwnode_handle

2
include/linux/property.h
View File

@ -281,6 +281,8 @@ struct fwnode_handle *fwnode_graph_get_remote_port(
struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_endpoint(
struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_node(struct fwnode_handle *fwnode,
u32 port, u32 endpoint);
int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
struct fwnode_endpoint *endpoint);