zl3073x_dpll_ptp_adjfine(9)

📦 version 7.3.1, in nixpkgs unstable

💅 zl3073x_dpll_ptp_adjfine 💅

okay so bestie, welcome to the Kernel API Manual ✨ — today's main character is zl3073x_dpll_ptp_adjfine, and honestly? her whole personality is "adjust PTP clock frequency." that's it, that's the vibe. no cap. 🎀

🌸 NAME 🌸

zl3073x_dpll_ptp_adjfine — adjust PTP clock frequency. iconic behaviour, lowkey does exactly what it says on the tin 🫶

⭐ SYNOPSIS ⭐

int zl3073x_dpll_ptp_adjfine (struct ptp_clock_info *info , long
scaled_ppm );

the way she takes two args and returns an int… she's giving "i'm a function signature and i know it" 😭

🦋 ARGUMENTS 🦋

  • info — the PTP clock info 💖 like, the whole identity of the clock bestie, she needs her paperwork
  • scaled_ppm — the frequency adjustment, but in scaled ppm, which is ppm * 2^16. yes, scaled. yes, 2^16. don't ask, just trust the math 🧚

👑 DESCRIPTION 👑

okay so real talk: this is only supported for NCO. only NCO, bestie, nobody else gets in the club 🚫💅

what she actually does? writes the delta frequency offset register. that's the whole task. she writes the register. slay 💅✨

🔥 RETURN 🔥

  • 0 — success! 🎉 or, plot twist, scaled_ppm is zero, which means it's a no-op. either way she's thriving 🌈
  • -EOPNOTSUPP — sad girl hours 😭 the NCO pin is not connected and scaled_ppm is non-zero. no pin, no adjustment, no service 💀
  • negative — some other error 🙈 like, not great, not terrible, definitely not the vibe

> fr fr: if you're getting -EOPNOTSUPP, check that NCO pin connection before you blame the function, she's literally telling you what's wrong 🫶

💜 SEE ALSO 💜

your girl over here in the kernel file ./drivers/dpll/zl3073x/dpll.c has a whole squad — here's the full friend group, no one left out, periodt:

okay that's the whole page bestie, go forth and adjust those frequencies 💖✨

sign-off szn: this masterpiece lives in ./drivers/dpll/zl3073x, dated October 2026, and it's page zl3073x_dpll_ptp_adjfine(9) of the Kernel API Manual 🎀 bye pookie, drink water, and may all your returns be 0 🫶💜

📦 where this page comes from