_clkdm_save_context(9)

👑 _clkdm_save_context(9) — like, the Kernel API Manual, but make it make sense

okay so bestie, we're in the Kernel API Manual today and the star of the show is _clkdm_save_context(9). it's a tiny little function with one job and honestly? it eats. let's get into it 💅

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✨ SYNOPSIS ✨

int _clkdm_save_context (struct clockdomain *clkdm , void *unused );

that's it. that's the whole signature. two params, one int coming back at you 🫶

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🎀 ARGUMENTS 🎀

• clkdm — a struct clockdomain *. and the manpage's official description of this? literally -- undescribed --. no cap, that's what it says. the docs simply did not elaborate 🙈
• unused — a void *. and yeah, you guessed it: also -- undescribed --. it's giving mysterious. it's giving "we'll never know". genuinely iconic behaviour from the documentation team 💀

ngl bestie, if you came here for the tea on what these two actually do, the source is the only place that's spilling it. the manpage is staying zipped.

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🌸 DESCRIPTION 🌸

so here's the situation, and it's lowkey serious: because of a suspend or hibernation operation, the state of the registers controlling this clkdm will be lost. gone. poof. 😭

so we save their context. that's the whole vibe. _clkdm_save_context swoops in pre-nap time and preserves the register state before the power situation gets weird.

it's the "save your progress before the laptop dies" of kernel functions, fr fr ✨

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🦋 SEE ALSO 🦋

all the siblings, cousins, and extended family — they all live in the kernel file ./arch/arm/mach-omap2/clockdomain.c:

_clkdm_register(9), _autodep_lookup(9), _resolve_clkdm_deps(9), _clkdm_add_wkdep(9), _clkdm_del_wkdep(9), _clkdm_add_sleepdep(9), _clkdm_del_sleepdep(9), clkdm_register_platform_funcs(9), clkdm_register_clkdms(9), clkdm_register_autodeps(9), clkdm_complete_init(9), clkdm_lookup(9), clkdm_for_each(9), clkdm_get_pwrdm(9), clkdm_add_wkdep(9), clkdm_del_wkdep(9), clkdm_read_wkdep(9), clkdm_clear_all_wkdeps(9), clkdm_add_sleepdep(9), clkdm_del_sleepdep(9), clkdm_read_sleepdep(9), clkdm_clear_all_sleepdeps(9), clkdm_sleep_nolock(9), clkdm_sleep(9), clkdm_wakeup_nolock(9), clkdm_wakeup(9), clkdm_allow_idle_nolock(9), clkdm_allow_idle(9), clkdm_deny_idle_nolock(9), clkdm_deny_idle(9), clkdm_add_autodeps(9), clkdm_del_autodeps(9), clkdm_clk_enable(9), clkdm_clk_disable(9), clkdm_hwmod_enable(9), clkdm_hwmod_disable(9), _clkdm_restore_context(9), clkdm_save_context(9), clkdm_restore_context(9)

and yes, _clkdm_restore_context(9) and clkdm_restore_context(9) are right there at the end — the save's other half. the way that the save/restore pair just belongs together 🥹💖

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and that's the page bestie!! 🎀 this one shipped from ./arch/arm/mach-omap2 and it's dated October 2026 — so like, mark your calendar, stay hydrated, and go save that context before the suspend hits you. mwah 💋✨🌸