STRUCT RZV2H_PLL_LIMITS(9)

✨ struct rzv2h_pll_limits(9) ✨

okay so bestie, welcome to the Kernel API Manual page for struct rzv2h_pll_limits — aka the lil' rulebook that says what numbers a PLL is actually allowed to do 💅 it's literally the PLL parameter constraints struct, and honestly? iconic.

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🌸 SYNOPSIS 🌸

here's the whole thing verbatim, do not touch, do not breathe on it:

struct rzv2h_pll_limits {
    u32 input_fref;
    struct {
      u32 min;
      u32 max;
    } fout;
    struct {
      u32 min;
      u32 max;
    } fvco;
    struct {
      u16 min;
      u16 max;
    } m;
    struct {
      u8 min;
      u8 max;
    } p;
    struct {
      u8 min;
      u8 max;
    } s;
    struct {
      s16 min;
      s16 max;
    } k;
 };

like look at those nested structs. the way that they're all min/max pairs… it's giving boundaries, it's giving self-respect 🎀

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🦋 Members 🦋

okay so here's the cast of characters, one by one:

• input_fref — the reference input frequency going into the PLL, measured in Hz. and here's the plot twist: if you set it to 0, it just defaults to 24MHz. queen behavior honestly ✨
• fout — the output frequency range, in MHz. yes MHz, not Hz, keep up bestie 😭
  • fout.min — the minimum output frequency you're allowed to ask for
  • fout.max — the maximum output frequency you're allowed to ask for
• fvco — the PLL oscillation frequency range, also in MHz
  • fvco.min — minimum allowed VCO frequency
  • fvco.max — maximum allowed VCO frequency
• m — the main-divider range
  • m.min — minimum main-divider value
  • m.max — maximum main-divider value
• p — the pre-divider range
  • p.min — minimum pre-divider value
  • p.max — maximum pre-divider value
• s — the divider range
  • s.min — minimum divider value
  • s.max — maximum divider value
• k — the delta-sigma modulator range, and ngl the key detail here: it's signed 🙈
  • k.min — minimum delta-sigma value
  • k.max — maximum delta-sigma value

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💖 Description 💖

so what is this thing for? literally just: this structure defines the minimum and maximum allowed values for the various parameters you use to configure a PLL. that's it, that's the whole vibe.

the point of these limits is to keep the PLL operating inside valid and stable ranges — so like, no sending it off into chaos territory 🔥 the constraints are the vibe check, and the PLL must pass it.

bestie please respect the min/max values. that's not a suggestion, that's the whole stable-operation situation 😌

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👑 SEE ALSO 👑

go read these next, they're in the group chat too:

• Kernel file ./include/linux/clk/renesas.h struct rzv2h_pll_pars(9)
• struct rzv2h_pll_div_pars(9)

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that's the whole page, no cap 🫶 this came straight out of the source file at ./include/linux/clk, dated October 2026, and it's filed under struct rzv2h_pll_limits(9) — slay, go configure your PLL responsibly 💜