STRUCT PWMCHIP_WAVEFORM(9)

👑 struct pwmchip_waveform(9) — like, the whole vibe ✨

okay so bestie, welcome to the Kernel API Manual entry for struct pwmchip_waveform, and no cap, this one is literally the blueprint for describing a PWM waveform on a pwm_chip's PWM channel. every field is about to eat, so let's go 💅

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✨ NAME ✨

struct pwmchip_waveform — describes a PWM waveform for a pwm_chip's PWM channel 🎀

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🌸 SYNOPSIS 🌸

struct pwmchip_waveform {
    __u32 hwpwm;
    __u32 __pad;
    __u64 period_length_ns;
    __u64 duty_length_ns;
    __u64 duty_offset_ns;
 };

like, that's the whole struct. she's cute, she's tidy, she's iconic 🦋

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💖 MEMBERS 💖

girlies, meet the fields — every single one matters, so pay attention 🙈

• hwpwm — the per-chip relative index of the PWM device. think of it as her little ID number inside the chip 👑
• __pad — padding, and it must be zero. no negotiations, no exceptions, fr fr 💀
• period_length_ns — the duration of the repeating period. and listen: a value of 0 represents a disabled PWM, so don't be out here acting surprised 🌙
• duty_length_ns — the duration of the active part in each period. that's the "on" chunk of the wave, the main character energy of the whole thing ⚡
• duty_offset_ns — the offset of the rising edge from a period's start. where the wave gets up and starts living 🌅

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🌈 SEE ALSO 🌈

kernel file ./include/uapi/linux/pwm.h — go read it, iykyk 📖

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lowkey reminder bestie: __pad stays zero and period_length_ns = 0 means the PWM is off. that's the whole mood, don't forget it 💜

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and that's the page!! sourced from ./include/uapi/linux, dated October 2026, and yes the header up top said struct pwmchip_waveform(9) like the queen she is 🫶 slay, bye 💅✨