stmmac_mdio_setup(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 stmmac_mdio_setup(9) 🌸

okay bestie, welcome to the Kernel API Manual ✨ today's main character is stmmac_mdio_setup(9), and it's literally the function that populates platform related MDIO structures so your ethernet driver can find its PHY. it's giving matchmaker-for-hardware and honestly? iconic 💅

✨ NAME ✨

stmmac_mdio_setup — Populate platform related MDIO structures. (yep, that's the whole job, and it ate)

🌈 SYNOPSIS 🌈

int stmmac_mdio_setup (struct plat_stmmacenet_data *plat , struct device_node *np , struct device *dev );

🎀 ARGUMENTS 🎀

  • plat — the driver data platform structure, aka your platform data bestie
  • np — the devicetree node, iykyk 🌳
  • dev — the device pointer, the device in question

💖 DESCRIPTION 💖

so here's the tea: this one searches for MDIO information from the devicetree 🔍 If an MDIO node is found, it's assigned to plat->mdio_node and plat->mdio_bus_data is allocated. If no connection can be determined, then just plat->mdio_bus_data is allocated, to indicate a bus should be created and scanned for a phy. And if it's determined that there's no MDIO bus needed? both are left NULL. periodt. 💀

⚠️ heads-up bestie: this expects that plat->phy_node has already been searched for. so like, do that first, don't skip steps 🙈

💫 RETURN 💫

0 on success, errno otherwise. that's it, that's the vibe ✨

🦋 SEE ALSO 🦋

Kernel file: ./drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

and the whole friend group, fr fr:

and that's the whole page bestie 💖 it came from ./drivers/net/ethernet/stmicro..., dated October 2026, and it's stmmac_mdio_setup(9) — go off and set up those MDIO structures, you've absolutely got this 🫶🌸

📦 where this page comes from