stmmac_mdio_read_c45(9)

📦 version 7.3.1, in nixpkgs unstable

💅 stmmac_mdio_read_c45(9) ✨

okay so bestie, welcome to the Kernel API Manual — yes, that's the manual name, and yes, it's lowkey iconic that you're here reading about Ethernet PHY stuff rn 🫶

🌸 NAME 🌸

stmmac_mdio_read_c45 — (the manpage literally gives you no description here, so. it's giving mysterious main character energy. the name is the whole personality 💀)

✨ SYNOPSIS ✨

int stmmac_mdio_read_c45 (struct mii_bus *bus , int phyaddr , int devad
, int phyreg );

that's the whole signature, no cap. it returns an int. periodt 🎀

🦋 ARGUMENTS 🦋

  • bus — points to the mii_bus structure 💖 like, that's the bus, that's the whole thing it's pointing at.
  • phyaddr — the MII addr 👑
  • devad — the device address to read 🔥 this is the one you're reading from, bestie.
  • phyreg — the MII reg 🌸 your register. your destination. your moment.

💜 DESCRIPTION 💜

so what does it do?? it reads data from the MII register from within the phy device. that's it, that's the job, and it ate 💅

but here's the tea: for the 7111 GMAC, we must set the bit 0 in the MII address register while accessing the PHY registers. literally have to, no way around it 🙈

and fortunately — and this is the good part — it seems this has no drawback for the 7109 MAC. so the 7109 is just chilling, unbothered, thriving ✨

🌈 SEE ALSO 🌈

Kernel file ./drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c — go read the source, bestie, iykyk 📖

like, the whole stmmac mdio friend group fr fr 💖🦋✨

mwah 💋 that's the page! source/version: ./drivers/net/ethernet/stmicro... and the date on this one is October 2026 — so like, future vibes, we love to see it. and remember: stmmac_mdio_read_c45(9) is the title, it's the name, it's the moment. slay 🎀

📦 where this page comes from