t3_mdio_change_bits(9)

📦 version 7.3.1, in nixpkgs unstable

💅 t3_mdio_change_bits — Kernel API Manual, bestie edition 🎀

Okay so this one lives in the kernel API manual (section 9, for the uninitiated), and it's literally called t3_mdio_change_bits. Bestie. It changes bits. In a PHY register. It's giving "small function, big purpose" and honestly? We stan. ✨

🌸 NAME 🌸

t3_mdio_change_bits — modify the value of a PHY register 🦋

✨ SYNOPSIS ✨

int t3_mdio_change_bits (struct cphy *phy , int mmd , int reg , unsigned
int clear , unsigned int set );

Not me dropping the whole signature like it's a fit pic 😭 — copy it exactly, no edits, that's the vibe.

💖 ARGUMENTS 💖

  • phy — the PHY to operate on 🧚 (yes, the PHY, the main character)
  • mmd — the device address
  • reg — the register address
  • clear — what part of the register value to mask off 🫶
  • set — what part of the register value to set 💅

👑 DESCRIPTION 👑

So here's the tea: it changes the value of a PHY register by applying a mask to its current value and ORing the result with a new value. That's it, that's the whole flex. Read, mask, OR, slay. 🌈

Lowkey iconic how much it does with so few words, ngl.

🔥 SEE ALSO 🔥

Kernel file ./drivers/net/ethernet/chelsio/cxgb3/t3_hw.c — that's the home base, iykyk 💜

And then the whole friend group, fr fr:

Every single one, no skips, we don't do that here 💀✨

Heads up bestie: this page comes from ./drivers/net/ethernet/chelsio... and it's dated October 2026 — and yes, the page itself is literally named t3_mdio_change_bits(9) at the bottom too. Cute of it. 🎀

Okay that's the whole page, go forth and mask-and-OR your little hearts out 🫶💖🌸 — signed, your resident Unix girlie who is lowkey obsessed with PHY registers now, no cap. 💅⭐

📦 where this page comes from