__phy_write_mmd(9)

📦 version 7.3.1, in nixpkgs unstable

💅 __phy_write_mmd(9) — from the Kernel API Manual, bestie

okay so listen up, because this one is lowkey a little shortcut function and it's giving "I do one thing and I do it well" energy ✨

🌸 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 );

she takes four things and hands you back an int, periodt 💅

🍓 ARGUMENTS

  • phydev — the phy_device struct. your main character, the PHY herself 🫶
  • devad — the MMD to read from. yes, that's what the manpage says, we're just relaying it 🧚
  • regnum — the register on the MMD to read. again, verbatim, don't come for me 😭
  • val — the value to write to regnum. the actual payload, the reason we're all here 🔥

👑 DESCRIPTION

Same rules as for __phy_write — that's it, that's the description. no cap. if you know __phy_write, you already know this one; they share the same rules, so go read that one for the deets, iykyk 💖

ngl, the original page is short and she's staying short. the facts are the facts, bestie 💀

🌈 SEE ALSO

Kernel file ./drivers/net/phy/phy-core.c and honestly a whole friend group of functions, all of them iconic, all of them linked here so you can go say hi 👑

and that's the whole page, bestie 🎀 huge shoutout to the ./drivers/net/phy directory for hosting all this excellence, and to the October 2026 edition of the Kernel API Manual for shipping it — slay, ate, no crumbs 💜🦋✨

📦 where this page comes from