stmmac_mdio_read_c22(9)

📦 version 7.3.1, in nixpkgs unstable

🦋 stmmac_mdio_read_c22(9) — kernel API manual, but make it fashion

okay so bestie, this is a page straight out of the Kernel API Manual — the function is stmmac_mdio_read_c22 and yes the manual name is literally just "Kernel API Manual", no extra lore, we move 💅

✨ NAME ✨

stmmac_mdio_read_c22 — and that's it. The original page leaves the description side blank (just a lonely little -), so we are not out here inventing lore, periodt 🎀

🌸 SYNOPSIS 🌸

int stmmac_mdio_read_c22 (struct mii_bus *bus , int phyaddr , int phyreg
);

that's the whole vibe check, bestie — it returns an int, and it takes three things 👑

🎀 ARGUMENTS 🎀

  • bus — this one points to the mii_bus structure. she's the main character of the whole operation fr fr 🦋
  • phyaddr — the MII addr. literally what it says on the tin ✨
  • phyreg — the MII reg. also literally what it says on the tin 💖

💜 DESCRIPTION 💜

okay so the tea: this bad boy reads data from the MII register, and it does it from within the phy device itself. iconic behavior, no notes 🌈

now the important bit — for the 7111 GMAC, you must set bit 0 in the MII address register while you're accessing the PHY registers. not optional, not a suggestion, it's a whole requirement 👑

and the lucky little plot twist? it seems this has no drawback for the 7109 MAC. so the 7109 is out here unbothered, living her best life, slay 😌✨

bestie pls don't skip the bit-0 thing on the 7111, it's not decorative 💀

🔥 SEE ALSO 🔥

the kernel file herself, in all her glory:

./drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

and the whole friend group 🫶:

like, the c45 siblings, the write twins, the reset, the clock, the register/unregister duo — the entire ensemble cast is here, ate and left no crumbs 👑💅

🌸 and that's the page!! huge shoutout to the source, ./drivers/net/ethernet/stmicro/..., dated October 2026 — read responsibly bestie, mwah 💖🧚‍♀️🍓

📦 where this page comes from