cdns_spi_chipselect(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 cdns_spi_chipselect 💅

okay so this is a page from the Kernel API Manual bestie, and it's about one (1) tiny function that does one (1) tiny thing, but like… it's the thing that makes your SPI chip actually listen, so show some respect ✨

✨ NAME ✨

cdns_spi_chipselect — literally just selects or deselects the chip select line 🎀 that's it. that's the whole job. iconic minimalism.

🦋 SYNOPSIS 🦋

void cdns_spi_chipselect (struct spi_device *spi , bool is_high );

no cap, that's the signature. returns nothing (void), takes two things, and then goes and does its little chip-select moment 💖

🌸 ARGUMENTS 🌸

  • spi — a pointer to the spi_device structure 🫶 like, the device we're talking to. it's giving "here's my friend's number" energy.
  • is_high — a bool that tells us whether we're selecting or deselecting the chip select line: Select is 0 and deselect is 1 👑 yes i know, the naming is a whole vibe check situation (it's named after the line level, not the action, iykyk), but that's the deal — 0 = select, 1 = deselect. write it on your hand. periodt.

💜 SEE ALSO 💜

the whole friend group 💅 all in the kernel file ./drivers/spi/spi-cadence.c, and they're all sitting here in the SEE ALSO section looking cute:

go read them all, they're literally all in ./drivers/spi and they all ate 🔥

real talk though: this function only handles the chip select line itself — everything else about your transfer lives in those other functions above, so don't come for this one when your FIFO is acting up 🙈

and that's the page!! 🎀 brought to you by the fine folks over in ./drivers/spi, dated October 2026, all about cdns_spi_chipselect(9) — go select a chip, bestie, slay 💖✨🦋

📦 where this page comes from