clkdm_add_sleepdep(9)

💤 clkdm_add_sleepdep(9) 💤

ok so this is a page from the Kernel API Manual — yes bestie, the kernel has lore too. today's main character is clkdm_add_sleepdep, and she is literally the reason your clock domain stays awake when her friend is around. no cap.

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✨ NAME ✨

clkdm_add_sleepdep — add a sleep dependency from clkdm2 to clkdm1 🫶

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🌸 SYNOPSIS 🌸

int clkdm_add_sleepdep (struct clockdomain *clkdm1 , struct clockdomain
*clkdm2 );

that's it, that's the whole vibe check 💅

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🎀 ARGUMENTS 🎀

• clkdm1 — the dependent one, aka the clockdomain we're telling "girl, do NOT go to sleep." it's a struct clockdomain * and we're preventing it from sleeping.
• clkdm2 — the source, aka the struct clockdomain * whose activity is the whole reason clkdm1 has to stay up. if she's active, the party continues.

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🦋 DESCRIPTION 🦋

ok so the tea ☕: this function prevents clkdm1 from automatically going inactive — and like, obviously that also means it doesn't sneak off into retention or off — if clkdm2 is active. it's giving "you can't leave until your friend gets picked up" energy. 😭

now for the return values, because the vibes depend on them:

• -EINVAL 💀 — you handed over invalid clockdomain pointers, OR you called this on a machine that does not support software-configurable hardware sleep dependencies. (rude of the machine, honestly.)
• -ENOENT 🙈 — the specified dependency cannot be set in hardware. it's just not happening, bestie.
• 0 👑 — success. slay. iconic. periodt.

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🌈 SEE ALSO 🌈

this list is long long, so buckle up — every single one of these is a real reference to 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_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_save_context(9)
• _clkdm_restore_context(9)
• clkdm_save_context(9)
• clkdm_restore_context(9)

like I said. a whole friend group. 🧚‍♀️

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ngl bestie, if you got -EINVAL from the hardware-not-supported branch, that's not you — that's the machine. don't internalize it. 💜

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and that's the page! this little gem lives in ./arch/arm/mach-omap2, dated October 2026 — the clkdm_add_sleepdep(9) era, and honestly? we were all there for it. 🍓✨ byeee 🎀