v4l2_spi_new_subdev
sd = v4l2_spi_new_subdev(&dev->v4l2_dev, ctlr, &board_info);
EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev);
struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,