fdt_subnode_offset_namelen(9)

📦 version 7.3.1, in nixpkgs unstable

💖 fdt_subnode_offset_namelen — the "find a subnode by substring" girlie 💖

okay so bestie, this one lives in the Kernel API Manual and it is genuinely so useful. it's fdt_subnode_offset_namelen, and it's basically the main character version of its sibling function that lets you match on just a slice of a name. iykyk. 🦋

✨ SYNOPSIS ✨

int fdt_subnode_offset_namelen (const void *fdt , int parentoffset ,
const char *name , int namelen );

like, look at her. four params, zero drama. 💅

🎀 ARGUMENTS 🎀

  • fdt — pointer to the device tree blob. yes ma'am, that's the blob. 🫶
  • parentoffset — structure block offset of a node. it's giving "where we're starting from" energy.
  • name — name of the subnode to locate. the thing you're hunting for 🔍
  • namelen — number of characters of name to consider. how much of the name actually gets to count. no cap.

🌸 DESCRIPTION 🌸

so this function is identical to fdt_subnode_offset, but plot twist: it only examines the first namelen characters of name when it's matching the subnode name. 🎯

the way that's useful? literally when you wanna find subnodes based on a portion of a larger string — like, say, a full path. you're not matching the whole thing, just the chunk you care about, and she eats that up every single time. obsessed. 🔥

⭐ RETURN ⭐

offset of the subnode — or, if your name doesn't show up anywhere:

-FDT_ERR_NOTFOUND

and that's the whole mood. 😭

🦋 SEE ALSO 🦋

kernel file ./scripts/dtc/libfdt/libfdt.h, plus the whole friend group — she does not go anywhere without them:

ngl bestie, the -FDT_ERR_NOTFOUND return is the one thing to actually remember — it's not a crash, it's just her way of saying "she's not here rn." 🙈

and that's the page!! 🧚 sign-off time: this one comes to you from ./scripts/dtc/libfdt, dated October 2026, and it's <rainbow>iconic</rainbow>. mwah 💜🍓

📦 where this page comes from