of_mdio_find_bus(9)

💖 of_mdio_find_bus(9) 💖

okay so bestie, welcome to the Kernel API Manual page for of_mdio_find_bus. this is the one where you hand over an mii_bus node and she finds the mii_bus for you. slay. ✨

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🎀 NAME 🎀

of_mdio_find_bus — Given an mii_bus node, find the mii_bus.

🌸 SYNOPSIS 🌸

struct mii_bus * of_mdio_find_bus (struct device_node *mdio_bus_np );

🦋 ARGUMENTS 🦋

• mdio_bus_np — Pointer to the mii_bus. that's it, that's the argument. 💅

⭐ RETURN ⭐

a reference to the mii_bus, or NULL if none found. The embedded struct device will have its reference count incremented, and this must be put once the bus is finished with.

🫶 real talk: that reference count bump is not decorative — you gotta put it when you're done with the bus. periodt.

🔥 DESCRIPTION 🔥

Because the association of a device_node and mii_bus is made via of_mdiobus_register, the mii_bus cannot be found before it is registered with of_mdiobus_register.

like, she doesn't exist to this lookup until of_mdiobus_register has made the association. so don't come looking early — the vibe check will fail. 😭

🧚 SEE ALSO 🧚

Kernel file ./drivers/net/phy/mdio_bus_provider.c — and the whole bestie lineup:

• mdiobus_release(9)
• mdio_bus_match(9)
• mdiobus_alloc_size(9)
• mdiobus_scan_c22(9)
• mdiobus_scan_c45(9)
• __mdiobus_register(9)
• mdiobus_free(9)
• mdio_find_bus(9)

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source/version: ./drivers/net/phy • date: October 2026 • page: of_mdio_find_bus(9) — mwah, bye bestie! 💋💖✨