device property: Add FW type agnostic fwnode_graph_get_remote_node

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>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index b979f8a..ac3590b 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -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

diff --git a/include/linux/property.h b/include/linux/property.h
index 7be014a..0597a74 100644 (file)
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -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);