fec_ptp_adjfine(9)

✨ fec_ptp_adjfine(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this is a little corner of the kernel where we gently nudge a clock's frequency, and honestly? iconic behavior.

---

🌸 NAME 🌸

fec_ptp_adjfine — adjust ptp cycle frequency 🕰️✨

---

🦋 SYNOPSIS 🦋

int fec_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm);

no cap, that's the whole signature. copy it exactly, please and thank you 🫶

---

🎀 ARGUMENTS 🎀

• ptp — the ptp clock structure 💅 this is the main character, it's the clock we're messing with.
• scaled_ppm — scaled parts per million adjustment from base 🍓 like, how far off from the base frequency are we trying to go, expressed in fancy scaled ppm.

---

🔥 DESCRIPTION 🔥

So what this does is adjust the frequency of the ptp cycle counter by the indicated amount from the base frequency. that's it, that's the vibe ⭐

Real talk about that scaled_ppm though: scaled parts per million means ppm with a 16-bit binary fractional field. yes, sixteen bits of fractional goodness, we love precision in this house 🙈

And then the fun part: because ENET hardware frequency adjust is complex, using software method to do that. 😭 So the hardware is doing too much, so we let software handle it instead. it's giving "I'll just do it myself" energy, and honestly? valid. no cap.

---

👑 SEE ALSO 👑

• Kernel file ./drivers/net/ethernet/freescale/fec_ptp.c
• fec_ptp_read(9)
• fec_ptp_enable_pps(9)
• fec_ptp_start_cyclecounter(9)
• fec_ptp_adjtime(9)
• fec_ptp_gettime(9)
• fec_ptp_settime(9)
• fec_ptp_enable(9)
• fec_ptp_init(9)

go read those too, they're all part of the same friend group 🧚💜

---

and that's the page bestie!! 🌈✨ this one lives in ./drivers/net/ethernet/freescale, it's the October 2026 edition, and it's the fec_ptp_adjfine(9) manual page — slay, go adjust some frequencies responsibly 💅🎀🦋