of_devfreq_...gister_power(9)

💅 of_devfreq_cooling_register_power — a Kernel API Manual moment ✨

okay so bestie, welcome to the Kernel API Manual entry for of_devfreq_cooling_register_power(9) and honestly? it's giving "thermal management but make it OF-aware and power-literate" 🫶 lock in, this one's actually so useful.

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🌸 NAME 🌸

of_devfreq_cooling_register_power — registers a devfreq cooling device, with OF and power information. that's it, that's the whole vibe 💖

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✨ SYNOPSIS ✨

struct thermal_cooling_device * of_devfreq_cooling_register_power
(struct device_node *np , struct devfreq *df , struct
devfreq_cooling_power *dfc_power );

like, it hands you back a struct thermal_cooling_device * and takes three pointers. iconic signature tbh 👑

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🎀 ARGUMENTS 🎀

• np — pointer to the OF device_node. the device-tree representation, the whole "where do i live in the tree" situation 🌳
• df — pointer to the devfreq device. this is your actual devfreq buddy that's getting cooled 📉
• dfc_power — pointer to a devfreq_cooling_power. the power-info plug, if you're plugging one in 🔌

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🔥 DESCRIPTION 🔥

so the whole point: this registers a devfreq cooling device. that's the main character energy right there ✨

⚠️ heads up bestie: the available OPPs must be registered on the device. like, non-negotiable. no OPPs registered = no vibes.

now, if dfc_power is provided (like, you actually passed something in), the cooling device gets registered with the power extensions 💪 cute. but — and this is the part you cannot skip —

for the power extensions to work correctly, devfreq should use the simple_ondemand governor. other governors are not currently supported. periodt. don't come crying to me when you swap governors and it acts up 😭

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🦋 SEE ALSO 🦋

lowkey go read these too, they're the friend group 🫶

• Kernel file ./drivers/thermal/devfreq_cooling.c
• struct devfreq_cooling_device(9)
• get_perf_idx(9)
• devfreq_cooling_gen_tables(9)
• of_devfreq_cooling_register(9)
• devfreq_cooling_register(9)
• devfreq_cooling_em_register(9)
• devfreq_cooling_unregister(9)

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aaaand that's the page!! 💜 this one lives under ./drivers/thermal, dated October 2026, and it's part of the Kernel API Manual — of course it is 💅 mwah, go register some cooling devices responsibly, ily, bye 🎀🌈⭐