hw_write_id_reg(9)

💅 hw_write_id_reg(9) — like, the Kernel API Manual page, bestie ✨

okay so real talk, this is from the Kernel API Manual (section 9, kernel internals, iykyk) and it's about writing into an identification register. short page, but it eats, so let's go 🎀

---

✨ NAME ✨

hw_write_id_reg — literally writes to a identification register. that's the whole vibe. no cap 💖

---

🦋 SYNOPSIS 🦋

void hw_write_id_reg (struct ci_hdrc *ci , u32 offset , u32 mask , u32 data );

note that it returns void — it does the thing, it doesn't come back with receipts 👑

---

🌸 ARGUMENTS 🌸

• ci — the controller. your main character struct, the whole reason we're here 🫶
• offset — offset from the beginning of identification registers region. yes, from the beginning, measure twice write once bestie 📏
• mask — bitfield mask. it's giving selective attention ✨
• data — new value. the glow-up you're applying 💅

---

💜 SEE ALSO 💜

lowkey a whole friend group, honestly:

• Kernel file ./drivers/usb/chipidea/ci.h
• struct ci_hw_ep(9)
• struct ci_role_driver(9)
• struct hw_bank(9)
• struct ci_hdrc(9)
• hw_read_id_reg(9) — the read girlie, sister function fr fr 🌈
• hw_read(9)
• hw_write(9)
• hw_test_and_clear(9)
• hw_test_and_write(9)
• ci_otg_is_fsm_mode(9)

---

ngl bestie, keep the offset and mask correct — it's an identification register and it's not here to be messed with 😭 the page doesn't promise you anything about what happens if you get it wrong, so don't test it 🙈

---

okay that's the whole page, it's short and iconic and we love her for it 💖 this came out of ./drivers/usb/chipidea in October 2026 — mwah, thanks for reading, ily, go write some registers responsibly 🧚‍♀️💅🍓