v4l2_dv_timings_aspect_ratio
*f = v4l2_dv_timings_aspect_ratio(&timings);
EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t);