fw_node_get_device
irm_device = fw_node_get_device(irm_node);
struct fw_device *root_device = fw_node_get_device(root_node);
struct fw_device *root_device = fw_node_get_device(root_node);
device = fw_node_get_device(node);
device = fw_node_get_device(node);
if (!fw_node_get_device(node))
device = fw_node_get_device(node);