v4l2_async_register_subdev(9)

💖 v4l2_async_register_subdev 💖

okay so bestie, welcome to the Kernel API Manual page for v4l2_async_register_subdev(9) — yes it's a whole mouthful, and yes it's important, so let's get into it 🫶

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✨ NAME ✨

v4l2_async_register_subdev — literally the function that registers a sub-device to the asynchronous subdevice framework 💅

like, that's the whole job. she registers. she's a sub-device. the framework is asynchronous. iconic behavior only.

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🎀 SYNOPSIS 🎀

v4l2_async_register_subdev (sd );

no cap, that's it. one call, one argument, main character energy 🌟

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🌸 ARGUMENTS 🌸

• sd — pointer to struct v4l2_subdev. that's your sub-device bestie, and yes it needs to be a pointer to that exact struct, don't be creative 🙈

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🌈 SEE ALSO 🌈

okay this is the part where the manpage name-drops its entire friend group and honestly the group chat is huge, so buckle up 🎀

It's all in the kernel file ./include/media/v4l2-async.h:

• enum v4l2_async_match_type(9)
• struct v4l2_async_match_desc(9)
• struct v4l2_async_connection(9)
• struct v4l2_async_notifier_operations(9)
• struct v4l2_async_notifier(9)
• struct v4l2_async_subdev_endpoint(9)
• v4l2_async_debug_init(9)
• v4l2_async_nf_init(9)
• v4l2_async_subdev_nf_init(9)
• v4l2_async_nf_add_fwnode(9)
• v4l2_async_nf_add_fwnode_remote(9)
• v4l2_async_nf_add_i2c(9)
• v4l2_async_subdev_endpoint_add(9)
• v4l2_async_connection_unique(9)
• v4l2_async_nf_register(9)
• v4l2_async_nf_unregister(9)
• v4l2_async_nf_cleanup(9)
• v4l2_async_register_subdev_sensor(9)
• v4l2_async_unregister_subdev(9)

like, every single one of them. the whole squad 💀✨

fr fr, if you're registering a sub-device you're gonna want v4l2_async_unregister_subdev(9) eventually too — balance, bestie 🧚

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and that's the page! source vibes come straight from ./include/media, dated October 2026, under the v4l2_async_register_subdev(9) title — slay, go register something 💜🎀