v4l2_subdev_to_csi2rx
struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(sd);
struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);