rtc_irq_set_freq(9)

📦 version 7.3.1, in nixpkgs unstable

✨ rtc_irq_set_freq(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's a lil function called rtc_irq_set_freq — think of it as the DJ deck for your real-time clock's periodic interrupt. it sets the frequency, and we're gonna get into it 🎀

🦋 SYNOPSIS 🦋

int rtc_irq_set_freq (struct rtc_device *rtc , int freq );

like yes, that's the whole vibe: you hand it a device, you hand it a number, it returns an int. slay ✨

🌸 ARGUMENTS 🌸

  • rtc — the rtc device 💅 your main character, the actual real-time clock you're messing with.
  • freq — a positive frequency ⭐ ngl the "positive" part is doing a lot of work here, keep it in mind.

🫶 CONTEXT 🫶

any 🔥 literally any context, no restrictions, go off queen.

💜 DESCRIPTION 💜

so here's the thing bestie, and it's lowkey important: this function sets the 2^N Hz periodic IRQ frequency for the IRQ 👑 that's the whole job. it's giving very niche, very specific, very iconic.

but the footnote!!! 📌 rtc_irq_set_state is the one you use to enable or disable the periodic IRQs. so like — setting the frequency and turning the thing on/off are two different functions, don't get it twisted 😭 this one sets the freq, that one flips the switch.

🚨 vibe check: this page doesn't tell you what happens with a bad freq, so don't come for me — all it says is positive frequency and 2^N Hz. periodt.

🌈 SEE ALSO 🌈

Kernel file ./drivers/rtc/interface.c — and the whole friend group 💖:

🧚 sign-off 🧚

this lil masterpiece lives in ./drivers/rtc, dated October 2026 🍓 that's the source/version and the date, all cute and accounted for. bye bestie, go set some frequencies 💅✨🌸

📦 where this page comes from