mmc_regulator_set_vqmmc2(9)

📦 version 7.3.1, in nixpkgs unstable

✨ mmc_regulator_set_vqmmc2(9) ✨

okay so bestie, welcome to the Kernel API Manual for mmc_regulator_set_vqmmc2(9) — yes the whole manual name is a vibe, we love her, she's iconic, let's get into it 🎀

💅 NAME 💅

mmc_regulator_set_vqmmc2 — sets vqmmc2 as per the ios->vqmmc2_voltage, no cap 🫶

🦋 SYNOPSIS 🦋

int mmc_regulator_set_vqmmc2 (struct mmc_host *mmc , struct mmc_ios *ios
);

literally that's the whole thing. short and slay. ✨

🌸 ARGUMENTS 🌸

  • mmc — the mmc host to regulate, she's the main character here 👑
  • ios — the io bus settings, aka where the voltage tea gets spilled 🍵

🧚 DESCRIPTION 🧚

So what does she actually do? She sets a new voltage level for the vqmmc2 regulator — which, iykyk, may correspond to the vdd2 regulator for an SD UHS-II interface. This function is expected to be called by mmc host drivers, so like… driver besties only, this is your moment 💖

Now for the return value, listen up because this is the important part:

  • Returns a negative error code on failure 😭 (it's giving flop, but like, handled)
  • Returns zero if the voltage level was changed successfully ✅ slay
  • Returns a positive value if the level didn't need to change 💀 — like, she was already at that voltage, no edits needed, the vibe check passed
ngl, that positive-means-no-change thing is lowkey the trap, so don't go treating "nonzero" as "error" bestie, the positive value is fine fr fr 🫶

🌈 SEE ALSO 🌈

Kernel file ./drivers/mmc/core/regulator.c — home of all these iconic siblings:

all of them, no skipping, we don't gatekeep the family 💜

and that's the page!! 🎀 this lil manual lives in ./drivers/mmc/core, dated October 2026, and she's part of the Kernel API Manual — go forth and regulate, bestie, you got this 💅✨🦋

📦 where this page comes from