fdt_next_subnode(9)

📦 version 7.3.1, in nixpkgs unstable

💅 fdt_next_subnode — like, the kernel API manual page for fdt_next_subnode(9) ✨

okay bestie, welcome to fdt_next_subnode(9) from the Kernel API Manual — this is the little function that tells you where the next direct subnode lives. it's giving tour guide energy for your device tree 💖

✨ NAME ✨

fdt_next_subnode — get offset of next direct subnode 🦋

🌸 SYNOPSIS 🌸

int fdt_next_subnode (const void *fdt , int offset );

literally that's the whole vibe. no cap, that's it ✨

🎀 ARGUMENTS 🎀

  • fdt — the FDT blob. your whole tree, your whole moment, the main character 🌈
  • offset — the offset of the previous subnode. yes bestie, you gotta know where you've been 💅

💜 DESCRIPTION 💜

okay so here's the whole ritual: you call fdt_first_subnode first, right? then you call this function over and over again in a loop to walk the direct subnodes of a parent node. that's the pattern. that's the assignment. periodt 🫶

🌸 lowkey key detail: it's fdt_first_subnode first, then this one repeatedly — this function does not kick off the walk, it continues it. fr fr ✨

⭐ RETURN ⭐

  • the offset of the next subnode — slay, you got one 🎉
  • -FDT_ERR_NOTFOUND — as in, there are no more subnodes 💀 the walk is over, go home, the party's finished 😭

🦋 SEE ALSO 🦋

the friend group is huge, so buckle up bestie, we're doing the whole roll call in order 💖

🧚 and yeah, the kernel file to go poke at is ./scripts/dtc/libfdt/libfdt.h — that's where the sauce lives ✨

okay that's the whole page, bestie, you ate that 🍓 this one's filed under ./scripts/dtc/libfdt and stamped October 2026 — go forth and iterate those subnodes, icon behavior only 👑💅

📦 where this page comes from