ENUM ATCPHY_MODE(9)

💅 enum atcphy_mode — NAME

okay so bestie, gather round: enum atcphy_mode is literally the Operating modes of the PHY ✨ that's it, that's the whole vibe. this is straight out of the Kernel API Manual, section 9, and it's giving "tiny enum, big main character energy" 👑

🦋 SYNOPSIS

enum atcphy_mode {
    APPLE_ATCPHY_MODE_OFF ,
    APPLE_ATCPHY_MODE_USB2 ,
    APPLE_ATCPHY_MODE_USB3 ,
    APPLE_ATCPHY_MODE_USB3_DP ,
    APPLE_ATCPHY_MODE_TBT ,
    APPLE_ATCPHY_MODE_USB4 ,
    APPLE_ATCPHY_MODE_DP

};

like, that's the whole cast of characters 🎀 seven icons, zero filler.

🌸 Constants

these are the members, and ngl each one is a whole personality:

• APPLE_ATCPHY_MODE_OFF — all PHYs powered off 😴 everyone's asleep, lights out, do not disturb.
• APPLE_ATCPHY_MODE_USB2 — Nothing on the four SS lanes (i.e. USB2 only on D-/+). so the SuperSpeed lanes are just sitting there empty 💀 USB2 is carrying the whole group chat on D-/+ alone.
• APPLE_ATCPHY_MODE_USB3 — USB3 on two lanes, nothing on the other two. half the lanes are booked and busy, the other half are on read receipts 🙈
• APPLE_ATCPHY_MODE_USB3_DP — USB3 on two lanes and DisplayPort on the other two. a collab!! 🤝 two lanes each, everyone eats.
• APPLE_ATCPHY_MODE_TBT — Thunderbolt on all lanes ⚡ full send, no lane left behind, that's the slay.
• APPLE_ATCPHY_MODE_USB4 — USB4 on all lanes 🔥 same all-lanes energy, USB4 flavored.
• APPLE_ATCPHY_MODE_DP — DisplayPort on all lanes 🌈 all four lanes doing exactly one job and doing it gorgeously.

lowkey noticing a pattern here: it's always four lanes, and the enum is basically "who's allowed on the lanes today" 🧚

🫶 SEE ALSO

• the Kernel file ./drivers/phy/apple/atc.c
• enum atcphy_pipehandler_state(9)
• struct apple_atcphy(9)

go read those too, they're the supporting cast and honestly they understood the assignment 💜

and that's the page!! fr fr thanks for reading bestie, this one lives in ./drivers/phy/apple and it's dated October 2026 — so like, future iconic behavior ⭐ periodt 💖