v4l2_create_fwnode_links(9)

💅 v4l2_create_fwnode_links(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for v4l2_create_fwnode_links, and honestly? it's giving matchmaker energy. let's get into it 🫶

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🌸 NAME 🌸

v4l2_create_fwnode_links — creates fwnode-based links from a source subdev to a sink subdev 💖

like. it literally builds the link between two subdevices. no cap.

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🎀 SYNOPSIS 🎀

int v4l2_create_fwnode_links (struct v4l2_subdev *src_sd , struct
struct v4l2_subdev *sink_sd );

okay wait, typos aside, the signature is:

int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd, struct v4l2_subdev *sink_sd);

two subdev pointers in, an int out. simple. iconic. periodt 💅

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🦋 ARGUMENTS 🦋

• src_sd — pointer to a source subdevice ✨ the one doing the sending, the main character of the relationship ngl
• sink_sd — pointer to a sink subdevice 🌸 the one on the receiving end, living its best receiving life

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⭐ DESCRIPTION ⭐

so what this function actually does? it goes searching for any and all fwnode endpoint connections between the source and sink subdevices, and translates them into media links 🔥 literally it's out here turning firmware descriptions into actual media graph links, which is lowkey kind of a glow-up.

and here's the vibe: the sink subdevice can be the one to call this — in its v4l2-async notifier subdev bound callback — to create all the links from a bound source subdevice 💜 like the sink is just out here making friends the second the source appears. obsessed.

NOTE: 🙈 any sink subdevice that calls this function must implement the .get_fwnode_pad media operation in order to verify endpoints passed to the sink are owned by the sink. no .get_fwnode_pad, no vibe check. it's mandatory bestie, don't skip it 😭

returns 0 on success, or a negative error code on failure. that's it. that's the return 💀

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🌈 SEE ALSO 🌈

• the kernel file ./include/media/v4l2-mc.h 📁
• v4l2_mc_create_media_graph(9)
• v4l_enable_media_source(9)
• v4l_disable_media_source(9)
• v4l2_create_fwnode_links_to_pad(9)
• v4l2_pipeline_pm_get(9)
• v4l2_pipeline_pm_put(9)
• v4l2_pipeline_link_notify(9)

all the media-graph besties in one place, iykyk 👑

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and that's the page!! sourced from ./include/media, dated October 2026, and titled v4l2_create_fwnode_links(9) obviously 🎀 mwah, go link those subdevices, ily, bye!! 🧚💖