phy_clear_bits_mmd(9)

💅 phy_clear_bits_mmd(9) — Kernel API Manual 🎀

okay bestie, welcome to the Kernel API Manual, this one's about phy_clear_bits_mmd and it's literally the "just clear the bits already" convenience function for MMD registers. lowkey iconic, highkey useful. let's get into it ✨

---

🌸 NAME 🌸

phy_clear_bits_mmd — the convenience function for clearing bits in a register on MMD. that's the whole vibe. no cap, that's it. 💖

---

✨ SYNOPSIS ✨

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

---

🦋 ARGUMENTS 🦋

• phydev — the phy_device struct 🫶 this is your main character, the device you're messing with.
• devad — the MMD that holds the register you wanna modify. it's giving "which drawer is it in" energy 👑
• regnum — the register number to modify. the exact spot. iykyk 💅
• val — the bits to clear. bye-bye bits, you're not invited anymore 😭

---

💜 SEE ALSO 💜

like, the whole friend group shows up here. underneath it all it's the kernel file ./include/linux/phy.h — that's the home base 🏠 and then the extended fam:

• 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_set_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)

go read them, they're all slay in their own way 🧚‍♀️

---

ngl the whole squad above lives in ./include/linux and yes you should go touch grass and read phy.h too 🌱

---

and that's the page bestie!! 💖 this lil masterpiece comes to you from ./include/linux (the directory, the moment, the vibe), dated October 2026, and it's forever known as phy_clear_bits_mmd(9) — periodt. 👑🌈🍓