ax_spi_init_hw(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ax_spi_init_hw(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the ax_spi_init_hw page from the Kernel API Manual — this is the one that wakes the SPI controller up and gives it a whole personality (a very specific, hardware-correct personality, no cap) 💖

✨ NAME ✨

ax_spi_init_hw — literally the function that initializes the hardware and configures the SPI controller 🎀

🦋 SYNOPSIS 🦋

void ax_spi_init_hw (struct ax_spi *xspi );

that's it, that's the whole signature, she's simple and she slays 💅

🌸 ARGUMENTS 🌸

  • xspi — pointer to the ax_spi structure 🫶 that's the whole vibe, just hand her the struct and she'll do her thing

⭐ DESCRIPTION ⭐

okay first, the tea on how the controller shows up out of reset ☕ she's configured to be in host mode, and while she's in host mode:

  • the baud rate divisor is set to 4 🔢
  • the threshold value for the TX FIFO not full interrupt is set to 1 🎯
  • the size of the word to be transferred is set as 8 bit 🧚

that's just the state she's in on reset, iykyk — not something this function is doing, it's what she arrives wearing 💀

now for what this function actually does, and honestly the way that it does all of it in one go is iconic 👑: it initializes the SPI controller to

  • disable and clear all the interrupts 🔕
  • enable manual target select and manual start 🎛️
  • deselect all the chip select lines 🙈
  • enable the SPI controller ✅

so yeah, interrupts off, manual vibes on, every chip select politely left alone, and then she's enabled. main character energy fr fr 🔥

🌈 SEE ALSO 🌈

she does not exist alone, she's part of a whole friend group 💜 the kernel file is ./drivers/spi/spi-axiado.c and the squad is:

go read them too bestie, they're all in their lane and they all ate 💖

and that's the page!! 🎀 it lives in ./drivers/spi, dated October 2026 — so yeah, from the future, obviously 💅 slay responsibly and initialize your hardware ✨🦋💜

📦 where this page comes from