__phy_set_bits_mmd(9)

hey bestie 💖 welcome to the Kernel API Manual! today’s main character is __phy_set_bits_mmd(9) — yes, the double-underscore one, iykyk ✨

💖 NAME 💖

okay so the NAME tea is: this is a convenience function for setting bits in a register on MMD. that’s the whole vibe, no cap 💅

✨ SYNOPSIS ✨

here’s the signature, bestie — copy it exactly, do not freestyle the commas:

int __phy_set_bits_mmd (struct phy_device *phydev , int devad , u32
       regnum , u16 val );

🎀 ARGUMENTS 🎀

the cast of characters 🫶:

• phydev — the phy_device struct. that’s the device bestie, periodt.
• devad — the MMD containing register to modify. yes, this one.
• regnum — register number to modify. the exact register we’re poking.
• val — bits to set. the bits themselves, iconic.

🦋 DESCRIPTION 🦋

🚨 lock check, bestie: the caller must have taken the MDIO bus lock. like, this is the whole description, no cap. the caller must have taken the MDIO bus lock. 🙈

🌈 SEE ALSO 🌈

the whole friend group, in order, no skips 🫶:

• Kernel file ./include/linux/phy.h
• enum phy_interface_t(9)
• phy_modes(9)
• rgmii_clock(9)
• struct mdio_bus_stats(9)
• struct mii_bus(9)
• mdiobus_alloc(9)
• enum phy_state(9)
• struct phy_c45_device_ids(9)
• struct phy_oatc14_sqi_capability(9)
• struct phy_device(9)
• struct phy_tdr_config(9)
• enum link_inband_signalling(9)
• struct phy_plca_cfg(9)
• struct phy_plca_status(9)
• struct phy_led(9)
• struct phy_mse_capability(9)
• struct phy_mse_snapshot(9)
• struct phy_driver(9)
• phy_id_compare(9)
• phy_id_compare_vendor(9)
• phy_id_compare_model(9)
• phydev_id_compare(9)
• phy_is_started(9)
• phy_driver_is_genphy(9)
• phy_disable_eee_mode(9)
• phy_can_wakeup(9)
• phy_may_wakeup(9)
• phy_read(9)
• __phy_read(9)
• phy_write(9)
• __phy_write(9)
• __phy_modify_changed(9)
• phy_read_mmd_poll_timeout(9)
• __phy_set_bits(9)
• __phy_clear_bits(9)
• phy_set_bits(9)
• phy_clear_bits(9)
• __phy_clear_bits_mmd(9)
• phy_set_bits_mmd(9)
• phy_clear_bits_mmd(9)
• phy_interrupt_is_valid(9)
• phy_polling_mode(9)
• phy_has_hwtstamp(9)
• phy_has_rxtstamp(9)
• phy_has_tsinfo(9)
• phy_has_txtstamp(9)
• phy_is_default_hwtstamp(9)
• phy_on_sfp(9)
• phy_interface_mode_is_rgmii(9)
• phy_interface_mode_is_8023z(9)
• phy_interface_is_rgmii(9)
• phy_is_pseudo_fixed_link(9)
• phy_module_driver(9)

okay that’s the page, bestie 💋 source: ./include/linux; date/version tea: October 2026; and the page label is __phy_set_bits_mmd(9). mwah 🫶✨