rtl83xx_setup_user_mdio(9)

💅 rtl83xx_setup_user_mdio — a page from the Kernel API Manual ✨

okay bestie, buckle up, because this is the little function that gets your built-in Ethernet PHYs talking 🫶

---

🌸 NAME 🌸

rtl83xx_setup_user_mdio — the one that registers the user mii bus driver 👑

---

🎀 SYNOPSIS 🎀

int rtl83xx_setup_user_mdio (struct dsa_switch *ds );

---

💖 ARGUMENTS 💖

• ds — the DSA switch that's literally associated with this user_mii_bus 💫

---

🦋 DESCRIPTION 🦋

So what it does is: it registers the MDIO bus for the built-in Ethernet PHYs, and then it associates that bus with the mandatory 'mdio' child OF node of the switch. like, mandatory mandatory — no cap, that node has to be there 🔥

---

⭐ CONTEXT ⭐

Can sleep 😴 (so yes, treat it accordingly, it's not an atomic-context girlie)

---

💜 RETURN 💜

• 0 on success 🎉
• a negative value for failure 😭

---

🌈 SEE ALSO 🌈

Kernel file ./drivers/net/dsa/realtek/rtl83xx.c plus the whole friend group:

• rtl83xx_lock(9)
• rtl83xx_unlock(9)
• rtl83xx_probe(9)
• rtl83xx_register_switch(9)
• rtl83xx_unregister_switch(9)
• rtl83xx_shutdown(9)
• rtl83xx_remove(9)
• rtl83xx_port_bridge_join(9)
• rtl83xx_port_bridge_leave(9)
• rtl83xx_port_fast_age(9)
• rtl83xx_port_fdb_add(9)
• rtl83xx_port_fdb_del(9)
• rtl83xx_port_fdb_dump(9)
• rtl83xx_port_mdb_add(9)
• rtl83xx_port_mdb_del(9)
• rtl83xx_port_bridge_flags(9)
• rtl83xx_setup_port_flood_control(9)

---

mwah 💋 this lil page lives at ./drivers/net/dsa/realtek, dated October 2026, and it's filed under rtl83xx_setup_user_mdio(9) ✨ slay ✨