genpd_prepare(9)

💅 genpd_prepare(9) — the Kernel API Manual page you actually wanna read

okay so bestie, welcome to the Kernel API Manual entry for genpd_prepare. it's a tiny little function with a big job and i'm gonna walk you through it like we're on facetime 🫶

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✨ NAME ✨

genpd_prepare — start the power transition of a device that lives in a PM domain. literally its whole personality 💅

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🌸 SYNOPSIS 🌸

int genpd_prepare (struct device *dev );

yes that's it. one arg. no cap. 🎀

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🦋 ARGUMENTS 🦋

• dev — the device you're starting the transition of. that's the one. hand it over and let genpd do its thing ✨

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🔥 DESCRIPTION 🔥

so here's the tea: genpd_prepare kicks off a power transition of a device — and to be clear, this happens during a system-wide power transition, not just any random tuesday 😌

and it does this under the assumption that the device's pm_domain field points to the domain member of an object of type struct generic_pm_domain — which represents a PM domain consisting of I/O devices. 🧚

bestie pls note: it literally says "under the assumption" — so this function is trusting you to have set things up right. it's not out here double-checking your work. main character energy, but also, be careful 💀

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💜 SEE ALSO 💜

first up, the source of truth — the kernel file itself:

• ./drivers/pmdomain/core.c

and now the whole friend group 😭 (yes, all of them, i'm not skipping a single one):

• dev_pm_genpd_set_performance_state(9), dev_pm_genpd_set_next_wakeup(9), dev_pm_genpd_get_next_hrtimer(9), dev_pm_genpd_set_hwmode(9), dev_pm_genpd_get_hwmode(9)
• dev_pm_genpd_rpm_always_on(9), dev_pm_genpd_is_on(9), pm_genpd_inc_rejected(9)
• genpd_queue_power_off_work(9), genpd_power_off(9), genpd_power_on(9), genpd_power_off_work_fn(9)
• __genpd_runtime_suspend(9), __genpd_runtime_resume(9), genpd_runtime_suspend(9), genpd_runtime_resume(9)
• genpd_power_off_unused(9), genpd_sync_power_off(9), genpd_sync_power_on(9)
• genpd_finish_suspend(9), genpd_suspend_noirq(9), genpd_finish_resume(9), genpd_resume_noirq(9)
• genpd_freeze_noirq(9), genpd_thaw_noirq(9), genpd_poweroff_noirq(9), genpd_restore_noirq(9), genpd_complete(9)
• dev_pm_genpd_suspend(9), dev_pm_genpd_resume(9)
• pm_genpd_add_device(9), pm_genpd_remove_device(9)
• dev_pm_genpd_add_notifier(9), dev_pm_genpd_remove_notifier(9)
• pm_genpd_add_subdomain(9), pm_genpd_remove_subdomain(9)
• pm_genpd_init(9), pm_genpd_remove(9)
• struct of_genpd_provider(9), genpd_xlate_simple(9), genpd_xlate_onecell(9)
• genpd_add_provider(9), of_genpd_add_provider_simple(9), of_genpd_add_provider_onecell(9), of_genpd_del_provider(9), genpd_get_from_provider(9)
• of_genpd_add_child_ids(9), of_genpd_remove_child_ids(9)
• of_genpd_add_device(9), of_genpd_add_subdomain(9), of_genpd_remove_subdomain(9), of_genpd_remove_last(9)
• genpd_dev_pm_detach(9), genpd_dev_pm_attach(9), genpd_dev_pm_attach_by_id(9), genpd_dev_pm_attach_by_name(9)
• of_genpd_parse_idle_states(9), of_genpd_sync_state(9)

like, that is an iconic amount of cross-references and every single one of them ate 💅🔥

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and that's the whole page bestie — go forth and transition those power domains responsibly 🦋✨

this gem comes to you from the ./drivers/pmdomain source tree, dated October 2026 — see you in the next release, mwah 💖