fdt_for_each_subnode(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, welcome to the Kernel API Manual page for fdt_for_each_subnode(9) — it’s giving “loop over a parent’s subnodes” and honestly it ate 💅✨

🌸 NAME 🌸

fdt_for_each_subnode — iterate over all subnodes of a parent 🦋

✨ SYNOPSIS ✨

fdt_for_each_subnode (node , fdt , parent );

🎀 ARGUMENTS 🎀

  • node — the child node, type int, and it’s an lvalue (yes bestie, it’s the iterator in the loop) 🫶
  • fdt — the FDT blob, type const void * 🌈
  • parent — the parent node, type int 👑

🦋 DESCRIPTION 🦋

okay so real talk: this is literally a wrapper around a for loop, and it’s used like this:

fdt_for_each_subnode(node, fdt, parent) { Use node ...  }

then you do your error handling like this:

if ((node < 0) && (node != -FDT_ERR_NOTFOUND)) { Error handling }

vibe check / important note: this whole thing is implemented as a macro, and node is used as the iterator in the loop. the parent variable can be constant or even a literal — fr fr, no cap 💅

💜 SEE ALSO 💜

Kernel file: ./scripts/dtc/libfdt/libfdt.h 🗂️

kisses bestie 💖 this page comes from ./scripts/dtc/libfdt, dated October 2026, and it’s the fdt_for_each_subnode(9) manual — periodt. 🫶✨

📦 where this page comes from