dfll_calculate_rate_request(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dfll_calculate_rate_request(9) — the dfll_calculate_rate_request kernel API manual, bestie edition

okay so picture this: you're deep in the Linux kernel, specifically the dfll_calculate_rate_request(9) page from the Kernel API Manual, and you need DFLL parameters for a rate. that's the whole vibe. let's get into it 🫶

✨ NAME ✨

dfll_calculate_rate_request — literally calculates DFLL parameters for a given rate. that's it, that's the function 💖

🌸 SYNOPSIS 🌸

int dfll_calculate_rate_request (struct tegra_dfll *td , struct
dfll_rate_req *req , unsigned long rate );

🎀 ARGUMENTS 🎀

  • td — your DFLL instance, the main character of this whole situation 👑
  • req — the DFLL-rate-request structure bestie, this is what we're filling in
  • rate — the desired DFLL rate, aka the goal, the dream, the target ✨

🦋 DESCRIPTION 🦋

so what this does is it populates the DFLL-rate-request record req's fields — specifically the scale_bits and mult_bits fields — based on the target input rate. no cap, that's the whole job.

returns 0 upon success 💚 … or -EINVAL if the requested rate in req->rate is too high or too low for the DFLL to generate 😭 like it's giving "girl that rate is not happening" energy. too much, too little, either way, invalid.

fr fr: if you're getting -EINVAL back, check that req->rate is actually in range for the DFLL before you start blaming the driver 🙈

🌈 SEE ALSO 🌈

the whole friend group, in order, and yes we're listing every single one because we don't do "etc." around here 💅

Kernel file ./drivers/clk/tegra/clk-dfll.c, plus:

okay that's the page!! mwah 💋 this came out of ./drivers/clk/tegra with a date of October 2026, and the page itself is dfll_calculate_rate_request(9) — go forth and calculate those rate requests, bestie, you're gonna slay 🧚‍♀️⭐

📦 where this page comes from