_clktrctrl_write(9)

💅 _clktrctrl_write(9) — like, the Kernel API Manual, bestie 🎀

okay so this is a page from the Kernel API Manual, section 9, and the star of the show is _clktrctrl_write. Buckle up, it's a tiny function with a big job 💖

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✨ NAME ✨

_clktrctrl_write — write @c to a CM_CLKSTCTRL.CLKTRCTRL register bitfield 🌸

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🦋 SYNOPSIS 🦋

void _clktrctrl_write (u8 c , u8 part , u16 inst , u16 cdoffs );

that's the whole signature, no cap — returns nothing (void), takes four little args 🫶

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🎀 ARGUMENTS 🎀

• c — the CLKTRCTRL register bitfield, and listen: it's the LSB = bit 0, i.e., unshifted value. like, do NOT pre-shift it, she handles that herself 💅
• part — the PRCM partition ID that the CM_CLKSTCTRL register lives in 🏠
• inst — the CM instance register offset (that's the *_INST macro) ⭐
• cdoffs — the clockdomain register offset (that's the *_CDOFFS macro) 🦋

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💜 DESCRIPTION 💜

so c must be the unshifted value for CLKTRCTRL — like, genuinely unshifted — because this function will handle the shift itself. she's got it, bestie, don't do her job for her 🙈✨

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🌈 SEE ALSO 🌈

the whole friend group 🫶 also peep the kernel file ./arch/arm/mach-omap2/cminst44xx.c:

• omap_cm_base_init(9)
• _clkctrl_idlest(9)
• _is_module_ready(9)
• omap4_cminst_is_clkdm_in_hwsup(9)
• omap4_cminst_clkdm_enable_hwsup(9)
• omap4_cminst_clkdm_disable_hwsup(9)
• omap4_cminst_clkdm_force_wakeup(9)
• omap4_cminst_wait_module_ready(9)
• omap4_cminst_wait_module_idle(9)
• omap4_cminst_module_enable(9)
• omap4_cminst_module_disable(9)
• omap4_clkdm_save_context(9)
• omap4_clkdm_restore_context(9)

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main character energy only: unshifted c in, correct bitfield out 💀 no pre-shifting, iykyk

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and that's the vibe check, bestie 👑 this iconic lil page came from ./arch/arm/mach-omap2 and is dated October 2026 — periodt, slay, go write some registers 💖🔥