in sun6i_hwspinlock.c [49:53]
static void sun6i_hwspinlock_debugfs_init(struct sun6i_hwspinlock_data *priv)
{
priv->debugfs = debugfs_create_dir(DRIVER_NAME, NULL);
debugfs_create_file("supported", 0444, priv->debugfs, priv, &hwlocks_supported_fops);
}