device connection: Find connections also by checking the references

We can also use this API to find named references that the
device nodes have by using fwnode_property_get_reference_args()
function.

Signed-off-by: Heikki Krogerus <[e-mail]>
Tested-by: Hans de Goede <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/base/devcon.c

···
 	return NULL;
 }
 
+static void *
+fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
+		    void *data, devcon_match_fn_t match)
+{
+	struct device_connection con = { };
+	void *ret;
+	int i;
+
+	for (i = 0; ; i++) {
+		con.fwnode = fwnode_find_reference(fwnode, con_id, i);
+		if (IS_ERR(con.fwnode))
+			break;
+
+		ret = match(&con, -1, data);
+		fwnode_handle_put(con.fwnode);
+		if (ret)
+			return ret;
+	}
+
+	return NULL;
+}
+
 /**
  * device_connection_find_match - Find physical connection to a device
  * @dev: Device with the connection
···
 
 	if (fwnode) {
 		ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
+		if (ret)
+			return ret;
+
+		ret = fwnode_devcon_match(fwnode, con_id, data, match);
 		if (ret)
 			return ret;
 	}

drivers/usb/roles/class.c

···
 	struct device *dev;
 
 	if (con->fwnode) {
-		if (!fwnode_property_present(con->fwnode, con->id))
+		if (con->id && !fwnode_property_present(con->fwnode, con->id))
 			return NULL;
 
 		dev = class_find_device(role_class, NULL, con->fwnode,