omap4_calc_volt_ramp(9)

✨ omap4_calc_volt_ramp(9) ✨

okay bestie, welcome to the Kernel API Manual — today's main character is omap4_calc_volt_ramp, and she is literally the reason your omap4 doesn't faceplant when the voltage moves. 🦋

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💖 NAME 💖

omap4_calc_volt_ramp — calculates voltage ramping delays on omap4

like, that's her whole job. voltage ramping delays. on omap4. slay. 👑

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🌸 SYNOPSIS 🌸

u32 omap4_calc_volt_ramp (struct voltagedomain *voltdm , u32
voltage_diff );

that's the whole signature, no cap. 🫶

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🎀 ARGUMENTS 🎀

• voltdm — the channel you're calculating values for. like, which voltage domain are we doing math for, bestie? 💅
• voltage_diff — the voltage difference, measured in microvolts. tiny units, big consequences. ⚡

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🧚 DESCRIPTION 🧚

okay so here's the vibe: this function calculates the voltage ramp prescaler + counter values for a voltage difference on omap4. that's it, that's the whole task, and she ate. 🔥

what you get back is a field value that's suitable for writing to the VOLTSETUP register for a channel, and it comes in this exact format:

• bits[8:9] prescaler
• bits[0:5] counter

the original even says "..." between them, so yes, there's a gap in the middle, that's just how it is. 🙈

for the full lore, see the OMAP4 TRM for reference. iykyk. 📚

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💀 SEE ALSO 💀

• Kernel file ./arch/arm/mach-omap2/vc.c
• struct omap_vc_channel_cfg(9)
• omap_vc_config_channel(9)
• omap3_set_i2c_timings(9)
• omap3_set_off_timings(9)
• omap4_usec_to_val_scrm(9)
• omap4_set_timings(9)
• omap4_vc_i2c_timing_init(9)
• omap_vc_i2c_init(9)
• omap_vc_calc_vsel(9)

all of these are her mutuals, fr fr. go read them next. 🌈

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and that's the whole page, bestie! 💜 this lil gift came to you from ./arch/arm/mach-omap2, dated October 2026 — iconic source, iconic date, periodt. 🎀✨