ENUM V4L2_SUBDEV_FORMAT_WHENCE(9)

💅 enum v4l2_subdev_format_whence(9) 💅

okay bestie, welcome to the Kernel API Manual ✨ (yes, the Kernel API Manual, we're in the big leagues now) — this is the page for enum v4l2_subdev_format_whence, which is basically the "is this for real or are we just vibing" switch for media bus formats 🦋

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🌸 NAME 🌸

enum v4l2_subdev_format_whence — the Media bus format type 🎀 (i.e. which flavor of format you're talking about, no cap)

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✨ SYNOPSIS ✨

enum v4l2_subdev_format_whence {
    V4L2_SUBDEV_FORMAT_TRY ,
    V4L2_SUBDEV_FORMAT_ACTIVE

};

that's it, that's the whole enum — two constants, zero drama, maximum icon behavior 👑

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🧚 Constants 🧚

• V4L2_SUBDEV_FORMAT_TRY — the try format, and it's for negotiation only 💬 like, it's the "hey can we test this out, no commitment" option. it does not get applied to the device, fr fr 🙈
• V4L2_SUBDEV_FORMAT_ACTIVE — the active format, aka the one applied to the device 🔥 this is the main character, it's actually happening 💅

lowkey important: one of these is a rehearsal 🎭 and the other is opening night 🌟 — do not mix them up bestie.

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🦋 SEE ALSO 🦋

Kernel file ./include/uapi/linux/v4l2-subdev.h 🍓 plus these iconic structs, all linked and accounted for:

• struct v4l2_subdev_format(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)

like, the whole friend group showed up to the group chat 🌈🫶

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mwah 💋 that's the page! this one's living at ./include/uapi/linux, dated October 2026, and it's the enum v4l2_su...ormat_whence(9) page — go read it again whenever you forget which constant actually touches the device 😭👑