gpmc_calc_wa...ring_divider(9)

💅 gpmc_calc_waitmonitoring_divider(9) — yes bestie, that's the Kernel API Manual 🎀

okay so first thing: the header up top lowkey truncates the name (gpmc_calc_wa...ring_divider(9)) but the full name is gpmc_calc_waitmonitoring_divider, and this whole page lives in the Kernel API Manual. she's a kernel function, she's from ./drivers/memory, and she's about to explain dividers to you. strap in 🦋

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✨ NAME ✨

gpmc_calc_waitmonitoring_divider — calculate the proper GPMCFCLKDIVIDER based on WAITMONITORINGTIME 💖

and the vibe check on WAITMONITORINGTIME? it will be _at least_ as long as desired, i.e.:

• read → don't sample the bus too early 🙈
• write → the data is longer on the bus ✍️

that's it, that's the whole energy. no cap.

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🌸 SYNOPSIS 🌸

int gpmc_calc_waitmonitoring_divider (unsigned int wait_monitoring );

literally one argument, one int back. she's lowkey low maintenance 💅

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🎀 ARGUMENTS 🎀

• wait_monitoring — the WAITMONITORINGTIME, measured in ns ⏱️ (nanoseconds, bestie, not vibes)

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🧚 DESCRIPTION 🧚

okay so here's the formula, and yes it's nested ceils, don't panic, we got this:

gpmc_clk_div + 1 = ceil(ceil(waitmonitoringtime_ns / gpmc_fclk_ns) / waitmonitoring_ticks)

that's the whole calculation, character for character, no notes 👑

and the edge case? if WAITMONITORINGTIME ends up resulting in 0 or 1 tick with div = 1, those get caught by the div <= 0 check. so nobody's out here dividing by zero on my watch, periodt 💀

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🔥 RETURN 🔥

• -1 on failure to scale 😭 (it tried, it really did)
• else the proper divider, > 0 ✨ slay

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🦋 SEE ALSO 🦋

kernel file ./drivers/memory/omap-gpmc.c — the whole friend group lives here:

• gpmc_get_clk_period(9)
• get_gpmc_timing_reg(9)
• set_gpmc_timing_reg(9)
• gpmc_calc_divider(9)
• gpmc_cs_set_timings(9)
• gpmc_configure(9)
• gpmc_omap_get_nand_ops(9)
• gpmc_cs_program_settings(9)
• gpmc_cs_remap(9)
• gpmc_read_settings_dt(9)
• gpmc_probe_generic_child(9)

go read them, iykyk 🌈

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okay that's the page!! this lil diva ships from ./drivers/memory, dated October 2026, in the Kernel API Manual (the (9) girlies 🫶). mwah, go calculate some dividers responsibly 💖✨🎀