clkdm_read_sleepdep(9)

💤 clkdm_read_sleepdep — a Kernel API Manual moment 💤

okay so bestie, buckle in, because we're reading a sleep dependency straight out of the clockdomain machinery, and it's honestly giving "quiet little function that knows everything about who's allowed to nap" ✨

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🌸 NAME 🌸

clkdm_read_sleepdep — read the sleep dependency state from clkdm2 to clkdm1, no cap 💅

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🎀 SYNOPSIS 🎀

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

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🦋 ARGUMENTS 🦋

• clkdm1 — this struct clockdomain * is the dependent one, i.e. the one we're asking "hey, are you prevented from sleeping?" about 🥺
• clkdm2 — this struct clockdomain * is the source, the one whose activity is the whole reason clkdm1 might have to stay awake 👑

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💖 DESCRIPTION 💖

So this is the vibe check between two clockdomains. It returns:

• 1 — slay, a hardware sleep dependency does exist, meaning clkdm1 will not be allowed to automatically go inactive while clkdm2 is active 🔥
• 0 — clkdm1's automatic power state inactivity transition is completely independent of clkdm2's, they're living their own lives, no strings attached 🦋
• -EINVAL — either clockdomain pointer is invalid, or you called this on a machine that doesn't support software-configurable hardware sleep dependencies 😭
• -ENOENT — the hardware itself is just incapable, it's not you, it's the silicon 💀

REVISIT: rn this function only represents software-controllable sleep dependencies. Sleep dependencies that are fixed in hardware are not yet handled here — so don't come for her about stuff she hasn't implemented yet 🙈

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🌈 SEE ALSO 🌈

Kernel file ./arch/arm/mach-omap2/clockdomain.c plus the whole friend group:

_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_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)

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okay that's the whole page, mwah 💋 this one lives over in ./arch/arm/mach-omap2 and the version/date stamp on it is October 2026 — signed, sealed, and delivered in the Kernel API Manual, periodt 🫶✨🎀