syscon_class_t
syscon_create(device_t pdev, syscon_class_t syscon_class)
syscon_create_ofw_node(device_t pdev, syscon_class_t syscon_class,
struct syscon *syscon_create(device_t pdev, syscon_class_t syscon_class);
syscon_class_t syscon_class, phandle_t node);