tegra_cvb_add_opp_table(9)

💅 tegra_cvb_add_opp_table(9) — Kernel API Manual, bestie edition ✨

okay so. header check: this is tegra_cvb_add_opp_table(9) from the Kernel API Manual, and yes it's exactly as iconic as it sounds. buckle up 🎀

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✨ NAME ✨

tegra_cvb_add_opp_table — literally builds an OPP table from the Tegra CVB tables 🦋

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🌸 SYNOPSIS 🌸

const struct cvb_table * tegra_cvb_add_opp_table (struct device *dev ,
       const struct cvb_table *tables , size_t count , struct rail_alignment
       *align , int process_id , int speedo_id , int speedo_value , unsigned
       long max_freq );

like yes that's a lot of arguments, but we're gonna get through them together, i promise 🫶

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💖 ARGUMENTS 💖

• dev — the struct device * that we're building the OPP table for. it's giving main character energy, honestly 👑
• tables — the array of CVB tables. the whole squad 🌈
• count — the size of that array we just mentioned. gotta know how many besties we're working with ✨
• align — the parameters of the regulator step and offset. fancy regulator math, don't worry about it 💅
• process_id — the process id of the HW module 🔥
• speedo_id — the speedo id of the HW module 🩱 (no cap, that's the actual name)
• speedo_value — the speedo value of the HW module ⭐
• max_freq — the highest safe clock rate. the ceiling, the limit, the "don't push it" 🚫

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🧚 DESCRIPTION 🧚

so, on Tegra, a CVB table encodes the relationship between operating voltage and safe maximal frequency for a given module (e.g. GPU or CPU). iykyk 💜

this function calculates the optimal voltage-frequency operating points for the given arguments and exports them via the OPP library for the given dev. it's literally matchmaking but for voltage and frequency 😭

and what does it give back? it returns a pointer to the struct cvb_table that matched, or an ERR_PTR on failure. so like, either you get your match or you get a vibe check that failed 💀

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👀 SEE ALSO 👀

• Kernel file ./drivers/clk/tegra/cvb.c — go read it, bestie, it's right there 📖

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fr fr: ERR_PTR is not a valid cvb_table pointer, so check that return value before you dereference it. no cap 🚨

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and that's the whole page, periodt 💅 source is ./drivers/clk/tegra, this is the Kernel API Manual, dated October 2026, and the page itself is tegra_cvb_add_opp_table(9) — obsessed with her, honestly 🎀🌸✨