STRUCT PWM_DEVICE(9)

💖 struct pwm_device(9) 💖

okay bestie, welcome to the Kernel API Manual ✨ — this one's about struct pwm_device, and it's literally the glow-up era of PWM channel objects. it's giving "one struct to rule your PWM channel." 🎀

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🌸 NAME 🌸

struct pwm_device — the PWM channel object. that's it, that's the whole vibe. 👑

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✨ SYNOPSIS ✨

okay so here's the whole glow-up, copy-pasted exactly because we do not mess with the source of truth:

struct pwm_device {
    const char *label;
    unsigned long flags;
    unsigned int hwpwm;
    struct pwm_chip *chip;
    struct pwm_args args;
    struct pwm_state state;
    struct pwm_state last;
 };

it's cute, it's compact, it's six-ish fields of pure main-character energy 🦋

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🫶 Members 🫶

let's do a lil member-by-member vibe check, iykyk:

• label — the name of the PWM device. its government name, basically. 💅
• flags — the flags associated with the PWM device. lil stickers on its locker. 🌈
• hwpwm — the per-chip relative index of the PWM device. so like, its seat number within its chip. not global, bestie, relative. 🪑
• chip — the PWM chip providing this PWM device. its parent, its home base, its ride-or-die. 🏠
• args — the PWM arguments. the receipts. 🧾
• state — the last applied state. what actually got shipped. 🚀
• last — the last implemented state (for PWM_DEBUG). the "what really happened" copy, kept around specifically for debugging. 🔍

lowkey important: last is tagged for PWM_DEBUG — so it's the debug-time reference copy of the last implemented state, no cap. don't act surprised when you see it hanging around in debug builds. 💀

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👀 SEE ALSO 👀

now go be nosy, bestie — the whole friend group is tagged below 🫶

• Kernel file ./include/linux/pwm.h
• enum pwm_polarity(9)
• struct pwm_args(9)
• struct pwm_waveform(9)
• pwm_get_state(9)
• pwm_init_state(9)
• pwm_get_relative_duty_cycle(9)
• pwm_set_relative_duty_cycle(9)
• struct pwm_capture(9)
• struct pwm_ops(9)
• struct pwm_chip(9)
• pwmchip_supports_waveform(9)
• pwm_config(9)
• pwm_enable(9)
• pwm_disable(9)
• pwm_might_sleep(9)

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and that's the page, bestie! 💖

sign-off szn 🎀 — this lore came straight out of ./include/linux and it's dated October 2026, so go forth and PWM responsibly, icon. periodt. ✨💅🦋