spi_take_timestamp_post(9)

📦 version 7.3.1, in nixpkgs unstable

💅 spi_take_timestamp_post — Kernel API Manual ✨

okay bestie, so this one's a helper function living in the Kernel API Manual, and it's basically the "you're done, let's stamp it" friend for your SPI driver. no cap. 🎀

🌸 SYNOPSIS 🌸

void spi_take_timestamp_post (struct spi_controller *ctlr , struct
spi_transfer *xfer , size_t progress , bool irqs_off );

that's the whole vibe — void, so it gives nothing back, it just does the thing. 🫶

✨ ARGUMENTS ✨

  • ctlr — pointer to the spi_controller structure of your driver. like, the controller it all belongs to, y'know? 👑
  • xfer — pointer to the transfer that's getting timestamped. the one being stamped. ⭐
  • progress — how many words have been transferred so far. words, not bytes, bestie, the manpage is literally yelling this at us 💀
  • irqs_off — if true, it will re-enable IRQs and preemption for the local CPU. yes, "re-enable" — that's the direction it goes. 🧚

🦋 DESCRIPTION 🦋

So this is a helper for drivers that want to collect the end of the TX timestamp for the requested byte from the SPI transfer. it's giving "final stamp, closing shift" energy. 💅

the iconic part is you can call it with an arbitrary frequency — go off, call it as much as you want — because only the first call where tx exceeds or is equal to the requested word will actually be timestamped. everything after that is just background noise, main character only. 😭✨

🌈 SEE ALSO 🌈

the kernel file ./drivers/spi/spi.c is the mothership, and here's the whole group chat of friends and neighbours:

lowkey the spi_take_timestamp_pre(9) one right there in the middle is this function's sibling — pre and post, the timestamp duo, iykyk 🫶

and that's the whole page, bestie, you ate ✨ this cutie came out of ./drivers/spi and it's dated October 2026 — so like, go forth and timestamp responsibly 💖🎀🍓

📦 where this page comes from