ptp_clock_register(9)

💅 ptp_clock_register(9) 💅

okay so this is a page from the Kernel API Manual, bestie — we're in ptp_clock_register(9) territory and honestly? it's giving "small function, big responsibilities" energy. Let's get into it 🫶

---

✨ NAME ✨

ptp_clock_register — the function that registers a PTP hardware clock driver 👑

✨ SYNOPSIS ✨

struct ptp_clock * ptp_clock_register (struct ptp_clock_info *info ,
       struct device *parent );

like, it takes two args and hands you back a struct ptp_clock *. slay.

✨ ARGUMENTS ✨

• info — the structure that describes the brand new clock you're bringing into the world 🌸 it's literally the whole personality of your clock ngl
• parent — a pointer to the parent device of that new clock 🎀 iykyk, it's the clock's parent device, no cap

✨ RETURN ✨

so here's the vibe check on what comes back:

• a valid pointer on success 🔥
• or PTR_ERR on failure 💀

⚠️ but wait — there's a plot twist: if PHC support is missing at the configuration level, this function returns NULL, and drivers are expected to gracefully handle that case separately. like, not me having to write a whole separate branch for it 😭 handle it gracefully, bestie, it's giving main character energy for your error path.

✨ SEE ALSO ✨

okay this list is LONG and every single one of these is iconic in its own right, so buckle in 🦋

• Kernel file ./include/linux/ptp_clock_kernel.h — yes, that's the file, go look at it 🔍
• struct ptp_clock_request(9)
• struct ptp_system_timestamp(9)
• struct ptp_clock_info(9)
• struct ptp_clock_event(9)
• scaled_ppm_to_ppb(9)
• diff_by_scaled_ppm(9)
• adjust_by_scaled_ppm(9)
• ptp_clock_unregister(9)
• ptp_clock_event(9)
• ptp_clock_index(9)
• ptp_clock_index_by_of_node(9)
• ptp_clock_index_by_dev(9)
• ptp_find_pin(9)
• ptp_find_pin_unlocked(9)
• ptp_schedule_worker(9)
• ptp_cancel_worker_sync(9)
• ptp_get_vclocks_index(9)
• ptp_convert_timestamp(9)

like, go read all of them. seriously. the whole friend group ate 💅✨

---

and that's the page!! this one lives out of ./include/linux in the October 2026 edition of the manual, so if you ever forget where it came from: that's the source, that's the date, no cap 🎀🫶 bye bestie, go register some clocks ⭐🌈