__phy_clear_bits_mmd(9)

💅 __phy_clear_bits_mmd — the Kernel API Manual tea 🫶

okay bestie grab a boba, because we're diving into __phy_clear_bits_mmd(9) from the Kernel API Manual and honestly? it's giving "small but mighty" 💖

---

✨ NAME ✨

__phy_clear_bits_mmd — the convenience function for clearing bits in a register on MMD 🎀 like, it exists purely so you don't have to hand-roll the whole dance yourself, and we stan a helpful queen

---

🌸 SYNOPSIS 🌸

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

---

🦋 ARGUMENTS 🦋

• phydev — the phy_device struct, i.e. the whole vibe of your PHY device 👑 this is the main character you're operating on
• devad — the MMD containing register to modify 💫 (this is where the register lives, so like, know your address bestie)
• regnum — register number to modify 🎯 the exact spot you're poking
• val — bits to clear 🧹 these are the ones getting yeeted out of existence. not me clearing bits. couldn't be me

---

💀 DESCRIPTION 💀

The caller must have taken the MDIO bus lock. 🔒

fr fr, that's the whole description and it is not a suggestion. no lock, no vibes. don't skip it, bestie 😭 that's the one rule.

---

🌈 SEE ALSO 🌈

the extended universe, in all its glory ✨:

• Kernel file ./include/linux/phy.h — the source file, the mothership 🌸
• 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) 🫶 (yes, the one from your args)
• 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_set_bits_mmd(9)
• phy_clear_bits_mmd(9) (that's the non-underscore sibling, go say hi 🫶)
• 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)

literally a whole friend group, iykyk 💜

---

that's the page bestie, no cap ✨ written out of ./include/linux, dated October 2026, and signed off with 💖 __phy_clear_bits_mmd(9) forever and always 🎀