spi_mem_adjust_op_size(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

spi_mem_adjust_op_size — bestie, this one tweaks the data size of a SPI mem operation so it actually fits what the controller can handle ✨

So this is a function in the Kernel API Manual, and it is lowkey the friend who checks the group chat plan against everyone's actual schedule. It looks at your op, looks at the controller's limitations, and adjusts accordingly 🫶

🌸 SYNOPSIS 🌸

int spi_mem_adjust_op_size (struct spi_mem *mem , struct spi_mem_op *op );

That's the whole vibe check: you hand it a mem and an op, it gives you back an int, and we'll get to what that int means in a sec, don't worry 💖

🎀 ARGUMENTS 🎀

  • mem — the SPI memory, literally the whole memory device we're working with 👑
  • op — the operation to adjust, i.e. the one getting its size reworked 💅

🦋 DESCRIPTION 🦋

Okay so here's the tea, bestie ☕ Some controllers have FIFO limitations and must split a data transfer operation into multiple ones. Others? They need a specific alignment for optimized accesses. And like, not every controller is built the same, so they can't all be main character about it 😭

This function is what lets SPI mem drivers split a single operation into multiple sub-operations when required. It's giving "let me break this down into bite-sized pieces for you" energy, and honestly? Iconic 🧚

⭐ RETURN ⭐

It returns a negative error code if the controller can't properly adjust op, and 0 otherwise ❌✅

Heads up bestie: note that op->data.nbytes will be updated if op can't be handled in a single step. So like, the struct changes, that's the whole point, don't @ me 🙈

🌈 SEE ALSO 🌈

Kernel file ./drivers/spi/spi-mem.c — go read it, iykyk 📖

And the whole friend group of related calls, fr fr:

✨ periodt ✨ That's the page, bestie. It lives under ./drivers/spi, and it was written down in October 2026 — so like, mark your calendar or whatever 🗓️💜 Slay, go adjust some op sizes responsibly 🔥

📦 where this page comes from