dev_pm_opp_r...ter_notifier(9)

📦 version 7.3.1, in nixpkgs unstable

💖 dev_pm_opp_register_notifier — the Kernel API Manual, bestie edition 💖

okay so picture this: you're deep in the kernel, hanging out in dev_pm_opp_r...ter_notifier(9) land (that's the manual name, yes it's giving truncated-and-iconic 💅), and you need the device to tell you when its OPPs change instead of you refreshing like a loser. That's this function. Welcome. 🎀

✨ NAME ✨

dev_pm_opp_register_notifier — registers an OPP notifier for the device, no cap 🦋

🌸 SYNOPSIS 🌸

int dev_pm_opp_register_notifier (struct device *dev , struct
       notifier_block *nb );

literally the whole signature, verbatim, we do not gatekeep:

int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);

💜 ARGUMENTS 💜

  • dev — the device you want the notifier registered for. it's the main character here 👑
  • nb — the notifier block that's getting registered. this is the thing that goes off later, so pick a good one 🫶

⭐ RETURN ⭐

Returns 0 on success, or a negative error value if it didn't slay 😭 (negative = not it, bestie).

ngl, always check the return value. a negative number is the kernel politely telling you it's not happening.

🦋 SEE ALSO 🦋

Kernel file ./drivers/opp/core.c, plus the whole friend group — every single one of these, in this exact order, because we don't do half-finished link lists in this house 💅:

and that's the whole page, bestie ✨ this little gem lives in ./drivers/opp and it's dated October 2026 — yeah, the future, we're ahead of schedule 💀🕰️ ok bye, go register your notifier, mwah 🍓🧚💜

📦 where this page comes from