phy_set_bits_mmd(9)

okay bestie, welcome to the phy_set_bits_mmd(9) page from the Kernel API Manual 💖✨ this one is short and sweet, and it’s giving “convenience function” in the best way.

🌸 NAME 🌸

phy_set_bits_mmd — a convenience function for setting bits in a register on MMD. That’s the whole vibe: register on MMD, bits get set, iconic behavior, no cap 💅

✨ SYNOPSIS ✨

the signature, preserved exactly because we do not play with code around here:

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

🎀 ARGUMENTS 🎀

• phydev — the phy_device struct, aka the main character data structure in question 🫶
• devad — the MMD containing the register you’re about to modify
• regnum — the register number to modify
• val — the bits to set ✨

🦋 SEE ALSO 🦋

the kernel file ./include/linux/phy.h is the home base, and the related lore is all here — every single one, fr fr:

• 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_set_bits_mmd(9), __phy_clear_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)

that’s a wrap, bestie 🫶 this page is sourced from ./include/linux, dated October 2026, and signed off with maximum sparkle 💅🎀✨