STRUCT CDNS3_USB_REGS(9)

okay so welcome to struct cdns3_usb_regs(9), bestie — this is the Kernel API Manual entry for the device controller registers, and we are about to get into every single field 💖

🎀 NAME 🎀

struct cdns3_usb_regs — device controller registers. That's the whole name, no extra lore: it's the register crew for the device controller, and every field gets its moment below, periodt.

✨ SYNOPSIS ✨

Here's the struct in all its layout glory — exact field names, exact types, no edits from me:

struct cdns3_usb_regs {
    __le32 usb_conf;
    __le32 usb_sts;
    __le32 usb_cmd;
    __le32 usb_itpn;
    __le32 usb_lpm;
    __le32 usb_ien;
    __le32 usb_ists;
    __le32 ep_sel;
    __le32 ep_traddr;
    __le32 ep_cfg;
    __le32 ep_cmd;
    __le32 ep_sts;
    __le32 ep_sts_sid;
    __le32 ep_sts_en;
    __le32 drbl;
    __le32 ep_ien;
    __le32 ep_ists;
    __le32 usb_pwr;
    __le32 usb_conf2;
    __le32 usb_cap1;
    __le32 usb_cap2;
    __le32 usb_cap3;
    __le32 usb_cap4;
    __le32 usb_cap5;
    __le32 usb_cap6;
    __le32 usb_cpkt1;
    __le32 usb_cpkt2;
    __le32 usb_cpkt3;
    __le32 ep_dma_ext_addr;
    __le32 buf_addr;
    __le32 buf_data;
    __le32 buf_ctrl;
    __le32 dtrans;
    __le32 tdl_from_trb;
    __le32 tdl_beh;
    __le32 ep_tdl;
    __le32 tdl_beh2;
    __le32 dma_adv_td;
    __le32 reserved1[26];
    __le32 cfg_reg1;
    __le32 dbg_link1;
    __le32 dbg_link2;
    __le32 cfg_regs[74];
    __le32 reserved2[51];
    __le32 dma_axi_ctrl;
    __le32 dma_axi_id;
    __le32 dma_axi_cap;
    __le32 dma_axi_ctrl0;
    __le32 dma_axi_ctrl1;
};

Peep the array sizes and the extra layout fields up there: reserved1[26], cfg_reg1, dbg_link1, dbg_link2, cfg_regs[74], and reserved2[51] are all part of the struct in the synopsis. The Members list below keeps the same order as the original, fr fr.

🧚 Members 🧚

okay bestie, field-by-field tour. Names and meanings stay exact, the vibe is just cuter 🫶

• usb_conf — Global Configuration. Big config energy.
• usb_sts — Global Status. Status check, main character style.
• usb_cmd — Global Command. Command-core.
• usb_itpn — ITP/SOF number. The number, literally as written.
• usb_lpm — Global Command. Yep, that's what it says here too — no fixing, no cap.
• usb_ien — USB Interrupt Enable. Enable energy for USB interrupts.
• usb_ists — USB Interrupt Status. Status but for USB interrupts.
• ep_sel — Endpoint Select. Pick your endpoint, periodt.
• ep_traddr — Endpoint Transfer Ring Address. Address for the endpoint transfer ring, exactly what it says.
• ep_cfg — Endpoint Configuration. Endpoint config moment.
• ep_cmd — Endpoint Command. Endpoint command core.
• ep_sts — Endpoint Status. Endpoint status vibes.
• ep_sts_sid — Endpoint Status. Same words as ep_sts, but a different field — keeping it exact.
• ep_sts_en — Endpoint Status Enable. Enable-core for endpoint status.
• drbl — Doorbell. Ding dong, bestie.
• ep_ien — EP Interrupt Enable. Enable energy for EP interrupts.
• ep_ists — EP Interrupt Status. EP interrupt status, slay.
• usb_pwr — Global Power Configuration. Power config with global reach.
• usb_conf2 — Global Configuration 2. The sequel config.
• usb_cap1 — Capability 1. Capability number one, iconic.
• usb_cap2 — Capability 2. Capability number two, still iconic.
• usb_cap3 — Capability 3. Capability number three, we love a trio.
• usb_cap4 — Capability 4. Capability number four, no skips.
• usb_cap5 — Capability 5. Capability number five, highkey essential.
• usb_cap6 — Capability 6. Capability number six, closing the cap run.
• usb_cpkt1 — Custom Packet 1. Custom packet number one.
• usb_cpkt2 — Custom Packet 2. Custom packet number two.
• usb_cpkt3 — Custom Packet 3. Custom packet number three.
• ep_dma_ext_addr — Upper address for DMA operations. Upper address detail, exactly as listed.
• buf_addr — Address for On-chip Buffer operations. Address for on-chip buffer operations, periodt.
• buf_data — Data for On-chip Buffer operations. Data for on-chip buffer operations.
• buf_ctrl — On-chip Buffer Access Control. Access control for the on-chip buffer.
• dtrans — DMA Transfer Mode. Transfer mode but make it DMA.
• tdl_from_trb — Source of TD Configuration. Source-of-TD-configuration energy.
• tdl_beh — TDL Behavior Configuration. TDL behavior config, noted.
• ep_tdl — Endpoint TDL. Endpoint TDL, simple and exact.
• tdl_beh2 — TDL Behavior 2 Configuration. TDL behavior sequel config.
• dma_adv_td — DMA Advance TD Configuration. DMA advance TD config, we see you.
• reserved1 — Reserved. Just reserved, bestie. Respect the reserve.
• cfg_regs — Configuration. Config regs doing their config thing.
• reserved2 — Reserved. Another reserved moment, no notes.
• dma_axi_ctrl — AXI Control. AXI control, slay.
• dma_axi_id — AXI ID register. AXI ID register, exactly as written.
• dma_axi_cap — AXI Capability. AXI capability, iconic.
• dma_axi_ctrl0 — AXI Control 0. AXI control zero.
• dma_axi_ctrl1 — AXI Control 1. AXI control one, closing it out.

🦋 SEE ALSO 🦋

Kernel file ./drivers/usb/cdns3/cdns3-gadget.h is the plug — it points at this whole squad:

• struct cdns3_trb(9)
• struct cdns3_endpoint(9)
• struct cdns3_aligned_buf(9)
• struct cdns3_request(9)
• struct cdns3_device(9)

Signed, sealed, and delivered from ./drivers/usb/cdns3, dated October 2026, for struct cdns3_usb_regs(9) — bye bestie, go read some registers 💅✨