STRUCT V4L2_SUBDEV_FORMAT(9)

💅 struct v4l2_subdev_format(9) — Kernel API Manual ✨

okay so bestie, welcome to the glow-up guide for struct v4l2_subdev_format 🎀 this is a Kernel API Manual page and honestly? it's giving "small struct, big main character energy" 👑

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🌸 NAME 🌸

struct v4l2_subdev_format — the pad-level media bus format, periodt 💖

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✨ SYNOPSIS ✨

here's the whole vibe, copy it exactly or the compiler WILL come for you 🫶

struct v4l2_subdev_format {
    __u32 which;
    __u32 pad;
    struct v4l2_mbus_framefmt format;
    __u32 stream;
    __u32 reserved[7];
 };

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🦋 Members 🦋

lowkey the most important part, bestie — every field, no skips, no cap 🔥

• which — the format type, and it comes straight from enum v4l2_subdev_format_whence 💫 like that's literally its whole job.
• pad — the pad number, exactly as the media API reports it. don't make up your own number, that's not the move 🙈
• format — the media bus format itself, aka the format code AND the frame size together. two things, one field, we love a multitasker 🎀
• stream — the stream number, defined over in subdev routing. iykyk 🌈
• reserved — not me having to say this but: drivers and applications must zero this array. zero it. don't touch it otherwise. no notes, that's the rule 💀

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👑 SEE ALSO 👑

the whole friend group, linked for your scrolling pleasure 🫶

• Kernel file ./include/uapi/linux/v4l2-subdev.h enum v4l2_subdev_format_whence(9)
• struct v4l2_subdev_crop(9)
• struct v4l2_subdev_mbus_code_enum(9)
• struct v4l2_subdev_frame_size_enum(9)
• struct v4l2_subdev_frame_interval(9)
• struct v4l2_subdev_frame_interval_enum(9)
• struct v4l2_subdev_selection(9)
• struct v4l2_subdev_capability(9)
• struct v4l2_subdev_route(9)
• struct v4l2_subdev_routing(9)
• struct v4l2_subdev_client_capability(9)

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and that's the page, bestie 🌸 this lil masterpiece lives in ./include/uapi/linux, dated October 2026, and signs off as struct v4l2_subdev_format(9) — iconic, no cap 💜✨