phy_modify(9)

💅 phy_modify(9) 💅

okay so bestie, welcome to the Kernel API Manual — this one is literally phy_modify(9), and it's giving "tiny convenience function with main character energy." Let's get into it. 🎀

---

✨ NAME ✨

• phy_modify — convenience function for modifying a given PHY register 💖

---

🌸 SYNOPSIS 🌸

int phy_modify (struct phy_device *phydev , u32 regnum , u16 mask , u16
set );

---

🦋 ARGUMENTS 🦋

• phydev — the phy_device struct 👑
• regnum — register number to write ✍️
• mask — bit mask of bits to clear 🧹
• set — new value of bits set in mask to write to regnum 💫

---

💀 NOTE 💀

MUST NOT be called from interrupt context, bestie. Like, MUST NOT. 😭 Because the bus read/write functions may wait for an interrupt to conclude the operation. So yeah — not the vibe for interrupt context, fr fr. 🙈

---

🌈 SEE ALSO 🌈

Kernel file ./drivers/net/phy/phy-core.c — and literally all of these icons:

• phy_speed_to_str(9)
• phy_duplex_to_str(9)
• phy_rate_matching_to_str(9)
• phy_fix_phy_mode_for_mac_delays(9)
• phy_interface_num_ports(9)
• phy_set_max_speed(9)
• of_set_phy_timing_role(9)
• phy_resolve_aneg_pause(9)
• phy_resolve_aneg_linkmode(9)
• phy_check_downshift(9)
• __phy_read_mmd(9)
• phy_read_mmd(9)
• __phy_write_mmd(9)
• phy_write_mmd(9)
• phy_modify_changed(9)
• __phy_modify(9)
• __phy_modify_mmd_changed(9)
• phy_modify_mmd_changed(9)
• __phy_modify_mmd(9)
• phy_modify_mmd(9)
• phy_save_page(9)
• phy_select_page(9)
• phy_restore_page(9)
• phy_read_paged(9)
• phy_write_paged(9)
• phy_modify_paged_changed(9)
• phy_modify_paged(9)

---

mwah 💋 this page lives under ./drivers/net/phy, dated October 2026, and it's literally phy_modify(9) signing off. slay. 🫶✨