axienet_mdio_read(9)

✨ NAME ✨

okay so bestie, welcome to axienet_mdio_read(9) from the Kernel API Manual — the MDIO interface read function. It’s giving “tiny function, big hardware energy” and honestly? Obsessed. 💖

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🌸 SYNOPSIS 🌸

int axienet_mdio_read (struct mii_bus *bus , int phy_id , int reg );

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🎀 ARGUMENTS 🎀

• bus — pointer to the mii bus structure. Your bus bestie. 🚌
• phy_id — address of the PHY device. Where the PHY lives, basically. 📍
• reg — PHY register to read. The exact little register you’re here for. 🎯

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💅 RETURN 💅

The register contents on success, -ETIMEDOUT on a timeout. That’s the whole return tea. ✨

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🦋 DESCRIPTION 🦋

Reads the contents of the requested register from the requested PHY address. The way it does this is kinda iconic: first it writes the details into the MCR register. After a while, the register MRD is read to obtain the PHY register content. Literally read-a-register pipeline behavior. 🫶

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c
• axienet_mdio_wait_until_ready(9)
• axienet_mdio_mdc_enable(9)
• axienet_mdio_mdc_disable(9)
• axienet_mdio_write(9)
• axienet_mdio_enable(9)
• axienet_mdio_setup(9)
• axienet_mdio_teardown(9)

Go read the whole friend group, bestie. It’s giving kernel networking lore. 💀💖

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mwah 💋 this page’s source/version is ./drivers/net/ethernet/xilinx, dated October 2026 — axienet_mdio_read(9), signing off. 🫶✨