phy_write_mmd(9)

📦 version 7.3.1, in nixpkgs unstable

💅 phy_write_mmd(9) — the Kernel API Manual, bestie edition 🎀

okay so you're in the kernel API manual (section 9, the fancy one ✨) and you found phy_write_mmd — congrats, you're about to write a register on an MMD on a given PHY. Iconic behaviour honestly 💖

🌸 NAME 🌸

phy_write_mmd — the convenience function for writing a register on an MMD on a given PHY. that's it, that's the whole vibe 🫶

✨ SYNOPSIS ✨

int phy_write_mmd (struct phy_device *phydev , int devad , u32 regnum ,
       u16 val );

look at that signature. main character energy, no cap 👑

🦋 ARGUMENTS 🦋

  • phydev — the phy_device struct. your PHY, your moment 💫
  • devad — the MMD to read from 👀 (yes the original says "read from", we're keeping it fr fr)
  • regnum — the register on the MMD to read 📖
  • val — value to write to regnum. this is the whole point bestie ✍️

🌈 DESCRIPTION 🌈

same rules as for phy_write. that's literally the whole description and honestly? we stan a concise queen 💅

ngl it's giving "read the phy_write page too" — so go read it, iykyk 😭

🎀 SEE ALSO 🎀

kernel file ./drivers/net/phy/phy-core.c and like, an entire friend group of functions:

all of them slay in their own way, go say hi 🫶✨

and that's the page!! sign-off time: this one lives in the source/version corner ./drivers/net/phy, dated October 2026 — so like, future-coded but make it kernel 🕰️💜 bye bestie, go write that register 💅🔥

📦 where this page comes from