STRUCT CDNS2_USB_REGS(9)

💅 struct cdns2_usb_regs(9) — the USB controller registers, bestie

okay so this is a page from the Kernel API Manual, section 9, and it's literally all about struct cdns2_usb_regs — aka the USB controller registers 🎀. ngl it's a glorified treasure map of memory offsets where every field is either a real register or a big ol' pile of reserved padding (we respect the padding, she's doing her job 💀).

✨ SYNOPSIS ✨

here's the whole struct, character for character, no cap:

struct cdns2_usb_regs {
    __u8 reserved[4];
    __u16 lpmctrl;
    __u8 lpmclock;
    __u8 reserved2[411];
    __u8 endprst;
    __u8 usbcs;
    __le16 frmnr;
    __u8 fnaddr;
    __u8 clkgate;
    __u8 fifoctrl;
    __u8 speedctrl;
    __u8 sleep_clkgate;
    __u8 reserved3[533];
    __u8 cpuctrl;
 };

like… look at her. the gaps are structural, she's not messy, she's intentional 🫶.

🌸 Members 🌸 (the field-by-field vibe check)

• reserved — reserved. that's it, that's the whole personality. hands off 🙈
• lpmctrl — LPM control register 🔥
• lpmclock — LPM clock register ⏰
• reserved2 — reserved. a whole 411 bytes of "please don't touch" energy 💀
• endprst — endpoint reset register 🧹
• usbcs — USB control and status register 👑
• frmnr — USB frame counter register (she's __le16, so little-endian, mwah) 💖
• fnaddr — function Address register 📮
• clkgate — clock gate register 🚪
• fifoctrl — FIFO control register 🍓
• speedctrl — speed Control register 🏎️
• sleep_clkgate — sleep Clock Gate register 😴
• reserved3 — reserved. and this one is 533 bytes, she's long, we stan a padding queen 💅
• cpuctrl — microprocessor control register 🧠

🦋 SEE ALSO 🦋

the whole friend group lives in the kernel file ./drivers/usb/gadget/udc/cdns2/cdns2-gadget.h, so go say hi to:

• struct cdns2_ep0_regs(9)
• struct cdns2_epx_base(9)
• struct cdns2_epx_regs(9)
• struct cdns2_interrupt_regs(9)
• struct cdns2_adma_regs(9)
• struct cdns2_trb(9)
• struct cdns2_ring(9)
• struct cdns2_endpoint(9)
• struct cdns2_request(9)
• struct cdns2_device(9)

bestie warning: these are all cross-references to other structs, not extra fields — don't go looking for them inside this one 🙈

🎀 the cute sign-off 🎀

this masterpiece ships from ./drivers/usb/gadget/udc/cdns2 and it's dated October 2026 — yeah, time traveler behavior ✨🦋 she's iconic, she's struct cdns2_usb_regs(9), and she ate. periodt. 💜