_set_clockactivity(9)

📦 version 7.3.1, in nixpkgs unstable

💅 _set_clockactivity — Kernel API Manual

okay so bestie, we're in section 9 of the Kernel API Manual today and the star of the show is _set_clockactivity. yes it's a kernel-internals page, no you don't have to be scared, i got you 🫶

🌸 NAME 🌸

_set_clockactivity — set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v

like literally that's the whole job. she sets bits. she does not write them anywhere. we'll get there.

✨ SYNOPSIS ✨

int _set_clockactivity (struct omap_hwmod *oh , u8 clockact , u32 *v );

three things in, one little int out. the vibe is very "small function, big responsibility" 💅

🎀 ARGUMENTS 🎀

  • oh — a struct omap_hwmod *, the hwmod we're doing all this for. main character energy honestly.
  • clockact — the CLOCKACTIVITY field bits. u8, so keep it smol and well-behaved.
  • v — pointer to the register contents you want to modify. this is what actually gets touched, not the hardware. big distinction, remember it 🦋

🌈 DESCRIPTION 🌈

so what she does: she updates the clockactivity mode bits inside v so they become clockact, and she does it for the oh hwmod. that's it, that's the whole arc of the story ✨

it's used for additional powersaving on some modules — lowkey a little eco-warrior move 🌱♻️

⚠️ important one bestie: she does not write to the hardware. _set_clockactivity only massages the register contents you handed her in v. if you were expecting a hardware write you're in the wrong function, no cap 💀

return value check: she returns -EINVAL upon error, or 0 upon success. so like, zero means slay, negative means something went sideways 🙈

🧚 SEE ALSO 🧚

the whole extended friend group, in the exact order she rolls with them — no one gets left out, i would never 😭🫶

periodt, that's the page 💖 go set some clockactivity bits, bestie, you've got this 👑

🎀 source spot: ./arch/arm/mach-omap2 · dated October 2026 · and she lives in the manual as _set_clockactivity(9) — that's the whole footer, mwah 🌸
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