usb_phy_write_readback(9)

💖 usb_phy_write_readback(9) 💖

okay so this is a page straight out of the Kernel API Manual, and honestly? it's a little icon of a function 🎀 — it writes to a register and then reads the masked value back to confirm the write actually landed. like, it double-checks itself. we love a self-aware king 👑

✨ NAME ✨

usb_phy_write_readback — writes a register and reads back the masked value to confirm it is written 💅 (yes bestie, it verifies. it's giving trust issues but make it functional.)

🌸 SYNOPSIS 🌸

void usb_phy_write_readback (struct usb_phy *phy_dwc3 , u32 offset ,
const u32 mask , u32 val );

returns nothing (void), takes four args, no cap 🫶

🦋 ARGUMENTS 🦋

• phy_dwc3 — the QCOM DWC3 phy context 🧚 (your lil' phy world, all wrapped up)
• offset — the register offset 📍 (where in the register map we're hanging out)
• mask — the register bitmask that says exactly what should be updated 🎀 (only these bits get touched, the rest are safe, periodt)
• val — the value to write ✍️ (the thing actually getting written)

⭐ SEE ALSO ⭐

• Kernel file ./drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c 📂 — go read the source, iykyk
• usb_ss_write_phycreg(9) 🔥
• usb_ss_read_phycreg(9) 💀 — the read half of the duo, they're a matching set bestie

lowkey obsessed with how this whole thing lives in ./drivers/phy/qualcomm — that's the neighborhood 🏡

okay that's the tea 💖 this page comes courtesy of the Kernel API Manual, dated October 2026, filed under ./drivers/phy/qualcomm 🌈 and honestly? iconic. stay verifying, besties 🫶✨🎀