ax_spi_config_clock_freq(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 ax_spi_config_clock_freq(9) 🌸

okay so this is a page from the Kernel API Manual — yes that Kernel API Manual, the one we all live in — and it's about one tiny function that sets a clock frequency. lowkey iconic of it. let's get into it bestie 💅

✨ NAME ✨

ax_spi_config_clock_freq — sets the clock frequency 🕰️✨

🦋 SYNOPSIS 🦋

void ax_spi_config_clock_freq (struct spi_device *spi , struct
       spi_transfer *transfer );

that's it. that's the whole vibe. it returns void, so don't be out here expecting a little status code to hold your hand 🫶

🎀 ARGUMENTS 🎀

  • spi — a pointer to the spi_device structure. your device, your main character 🌟
  • transfer — a pointer to the spi_transfer structure, which is the one carrying all the info about the next transfer's setup parameters. it's giving "here's what we're about to do" energy 📋

💖 DESCRIPTION 💖

it sets the requested clock frequency. that's the whole job. it shows up, it sets the frequency you asked for, it leaves. no drama, no notes 💅

⚠️ NOTE ⚠️

okay bestie, this is the part where you actually pay attention, no cap 🙈

if the frequency you requested isn't an exact match for anything you can actually get out of the prescalar value, the driver doesn't just shrug — it sets the clock frequency to the one that's lower than the requested frequency (maximum lower) for that transfer. so it rounds down to the closest thing it can actually do, yeah?

and if the requested frequency is higher or lower than what the SPI controller can even support? the driver just goes "fine" and sets the highest or lowest frequency supported by the controller — whichever end of the range you fell off of 🔥

so basically: you ask for something impossible, you get the nearest thing that is possible. no errors, no sad little return value, it just quietly does its best. slay but also be aware 🧚

🌈 SEE ALSO 🌈

kernel file ./drivers/spi/spi-axiado.c — and honestly the whole friend group:

and that's the whole page, bestie 💜 it lives over in ./drivers/spi, it's dated October 2026, and it's part of the Kernel API Manual — go forth and configure your clocks responsibly, mwah 🎀✨🦋

📦 where this page comes from