omap4_prmins...rt_hardreset(9)

💅 omap4_prmins...rt_hardreset(9)

okay bestie so this is from the Kernel API Manual (yes, the truncated-looking name in the header is literally how it ships — omap4_prmins...rt_hardreset(9), the ellipsis is the kernel docs being extra, not me 💀). Anyway. It does one job and it does it slayfully. Let's go 🫶

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✨ NAME ✨

omap4_prminst_assert_hardreset — assert the HW reset line of a submodule 🔥

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✨ SYNOPSIS ✨

int omap4_prminst_assert_hardreset (u8 shift , u8 part , s16 inst , u16
rstctrl_offs );

like, it takes four args and gives you back an int. that's the whole vibe ✨

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🌸 ARGUMENTS 🌸

• shift — register bit shift corresponding to the reset line you're asserting. this is the one arg the manpage actually bothered to describe 😭
• part — -- undescribed -- 💀 the docs literally say nothing. ngl, iconic of them.
• inst — -- undescribed -- 🙈 also a mystery. the manpage is gatekeeping.
• rstctrl_offs — -- undescribed -- 🎀 again: no description. not me defending this, i'm just the messenger fr fr.

lowkey important: those three -- undescribed -- entries are NOT me being lazy. that's genuinely what the manual says. do not come for me 💅

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🦋 DESCRIPTION 🦋

so some IPs — think dsp, ipu, or iva — contain processors that need an HW reset line asserted / deasserted in order to fully enable the IP. like, the whole module doesn't wake up properly until you do the little reset dance 🧚

these modules may have multiple hard-reset lines, and each one resets a different 'submodule' inside the IP block. so you're not resetting the whole thing, just the one piece you point at 👑

this function will place the submodule into reset. that's the entire assignment, and it eats.

it returns 0 upon success 💖 or -EINVAL upon an argument error 😭 — so if you get -EINVAL back, check your args, bestie, because something you passed did not pass the vibe check.

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🌈 SEE ALSO 🌈

• Kernel file ./arch/arm/mach-omap2/prminst44xx.c
• omap_prm_base_init(9)
• omap4_prminst_is_hardreset_asserted(9)
• omap4_prminst_deassert_hardreset(9)

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and that's the whole page, periodt 💜

sign-off time: this icon was served up from ./arch/arm/mach-omap2, dated October 2026, under the name omap4_prmins...rt_hardreset(9). go assert some reset lines, bestie — you got this 🎀✨