STRUCT CLK_REF(9)

💅 struct clk_ref(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and honestly? it's a little cutie. let's get into it ✨

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🌸 NAME 🌸

struct clk_ref — the mxs reference clock 👑

✨ SYNOPSIS ✨

like, here's the whole vibe of the struct, no cap:

struct clk_ref {
    struct clk_hw hw;
    void __iomem *reg;
    u8 idx;
 };

🎀 Members 🎀

• hw — the clk_hw for the reference clock. that's her main character energy fr 💖
• reg — the register address 📍
• idx — the index of the reference clock within the same register. lowkey the way she tells the others apart 🫶

🦋 Description 🦋

k so the mxs reference clock sources from pll. and here's the tea: every 4 reference clocks share one register space, and idx is literally what's used to identify them 💅

each reference clock has a gate control and a fractional * divider — yes bestie, both, she's doing the most ✨

and the rate? calculated as pll rate * (18 / FRAC), where FRAC = 18 ~ 35. that's it, that's the math 🧮🔥

ngl the * in "fractional * divider" is just sitting there being iconic, iykyk. we don't question it, we respect it 🙈

🌈 SEE ALSO 🌈

• Kernel file ./drivers/clk/mxs/clk-ref.c 🍓

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and that's the whole page, bestie 🧚💜 hope the vibe check passed — go read the source, it's giving iconic 👑

source/version: ./drivers/clk/mxs · dated: October 2026 · struct clk_ref(9) — ok bye ily, slay the kernel 🫶✨💖