lmk04832_calc_pll2_params(9)

💅 lmk04832_calc_pll2_params — the Kernel API Manual moment 🎀

okay so bestie, this is a page straight out of the Kernel API Manual, and it's literally about getting your PLL2 parameters so the VCO frequency can be set. no cap, it's a whole function. let's get into it ✨

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🌸 NAME 🌸

lmk04832_calc_pll2_params — get the PLL2 parameters that are used to set the VCO frequency. that's it, that's the vibe 🫶

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⭐ SYNOPSIS ⭐

long lmk04832_calc_pll2_params (unsigned long prate , unsigned long rate
, unsigned int *n , unsigned int *p , unsigned int *r );

yep, she returns a long. noted. moving on 💖

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🦋 ARGUMENTS 🦋

• prate — the parent rate feeding into PLL2, usually OSCin. your starting point, bestie ✨
• rate — the desired output rate for the VCO. what you want, the dream 🎯
• n — a reference to PLL2_N. hand over the pointer, get the value 👑
• p — a reference to PLL2_P. same deal 💅
• r — a reference to PLL2_R. third one, iconic trio 🎀

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🔥 DESCRIPTION 🔥

so this function assumes LMK04832_BIT_PLL2_MISC_REF_2X_EN is set — and honestly it should be, because the datasheet recommends it. the way that a higher phase detector frequency makes designing wider loop bandwidth filters possible?? obsessed. that's the whole reason, fr fr 💜

the VCO rate can be calculated using the following expression:

VCO = OSCin * 2 * PLL2_N * PLL2_P / PLL2_R

write it down, screenshot it, tattoo it, idc — it's giving main character math 🌈

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💀 RETURN 💀

the vco rate, or a negative errno if things go sideways. lowkey important to check which one you got 🙈

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/clk/clk-lmk04832.c
• struct lmk04832_device_info(9)
• struct lmk04832(9)
• lmk04832_check_vco_ranges(9)

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💖 that's the whole page bestie. all the facts, none of the boring. slay.

and finally, a cute little sign-off for the footer: this one lives under ./drivers/clk, dated October 2026, and it's titled lmk04832_calc_pll2_params(9) — periodt 👑💅