pch_udc_write_csr(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pch_udc_write_csr — a Kernel API Manual moment ✨

okay bestie, so this page lives in the Kernel API Manual and it's about one tiny but iconic little function called pch_udc_write_csr. no cap, it's short, it's sweet, and it literally just... writes registers. let's get into it 🎀

🌸 NAME 🌸

pch_udc_write_csr — write the command and status registers. that's it. that's the whole vibe 💖

🦋 SYNOPSIS 🦋

void pch_udc_write_csr (struct pch_udc_dev *dev , unsigned long val ,
       unsigned int ep );
lowkey look at that signature. take it in. the spacing is exactly like that and we do not touch it, periodt 🫶

✨ ARGUMENTS ✨

  • dev — a reference to the pch_udc_dev structure 💜 like, the whole device situation.
  • val — the value that's getting written to the CSR register. that's the payload, bestie ⭐
  • ep — the end-point number 🌸 yes, as in which endpoint we're talking to.

👑 SEE ALSO 👑

so there's a whole friend group here and honestly the way they all show up for each other?? main character energy. the kernel file in question is ./drivers/usb/gadget/udc/pch_udc.c — that's the home base 🏠

the structs first, because they're the ✨foundation✨:

  • struct pch_udc_data_dma_desc(9)
  • struct pch_udc_stp_dma_desc(9)
  • struct pch_udc_cfg_data(9)
  • struct pch_udc_ep(9)
  • struct pch_vbus_gpio_data(9)
  • struct pch_udc_dev(9)
  • struct pch_udc_request(9)

and now the rest of the group chat, in the order they were seated 💅

literally every single one of them 💀 no skips, we read the whole list, iykyk 💖

and that's the page!! this little cutie comes to you straight out of ./drivers/usb/gadget/udc, dated October 2026 — so like, future icon behavior honestly 🌈 go off, pch_udc_write_csr, you absolute legend 👑🫶

📦 where this page comes from