cdns_spi_detect_fifo_depth(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cdns_spi_detect_fifo_depth — a Kernel API Manual moment

okay bestie, welcome to the Kernel API Manual entry for cdns_spi_detect_fifo_depth(9). yes that's a whole mouthful, no i will not be shortening it, it's iconic.

✨ NAME ✨

cdns_spi_detect_fifo_depth — literally just detects the FIFO depth of the hardware 🕵️‍♀️✨

🎀 SYNOPSIS 🎀

void cdns_spi_detect_fifo_depth (struct cdns_spi *xspi );

that's it. that's the whole vibe. she takes one pointer and returns nothing (void), because she's a doer, not a returner. periodt.

🦋 ARGUMENTS 🦋

  • xspi — Pointer to the cdns_spi structure. that's your girl, the whole context, the main character of this function 🫶

🌸 DESCRIPTION 🌸

okay so here's the tea, and it's giving hardware lore ☕✨

The depth of the TX FIFO is a synthesis configuration parameter of the SPI IP. read that again. synthesis configuration parameter. it's baked in at build time, so you can't just ask the hardware nicely what it is — rude, honestly.

but!! (and this is the clever part, the way that the designers ate 💅) the FIFO threshold register is sized so that its maximum value can be the FIFO size - 1. which means — plot twist — that's exactly how you detect the size of the FIFO. iconic behavior. no cap. 🔥

👑 SEE ALSO 👑

that's the whole squad, go say hi to all of them 💜

🧚 quick reminder bestie: this page lives under ./drivers/spi, dated October 2026. screenshot it, frame it, whatever — it's yours now 🌈

and that's the page!! mwah 💋 source: ./drivers/spi, version vibes: October 2026 — catch you in the kernel tree, bestie, stay slaying 👑💖🎀

📦 where this page comes from