STRUCT IRQ_FWSPEC(9)

💅 struct irq_fwspec(9)

okay bestie, welcome to the Kernel API Manual ✨ — we're doing a whole deep-dive on one little struct today and honestly? she's iconic. no cap.

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🌸 NAME 🌸

struct irq_fwspec — the generic IRQ specifier structure 🎀

like, it's literally the standard-issue little bundle you use to describe an interrupt. periodt.

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✨ SYNOPSIS ✨

struct irq_fwspec {
    struct fwnode_handle    *fwnode;
    int param_count;
    u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
 };

look at her. three fields. absolutely ate. 🔥 (yes, the brace indentation is exactly like that, i don't make the rules 🫶)

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🦋 Members 🦋

• fwnode — a pointer to a firmware-specific descriptor. it's giving "here's where the firmware lives", yk? 👑
• param_count — the number of device-specific parameters. basically the vibe check on how many params are actually real. 💯
• param — the device-specific parameters themselves. the main characters of the whole struct, honestly. 🌟

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💜 Description 💜

so here's the tea ☕ — this structure is directly modeled after of_phandle_args, and its whole job is to pass along a device-specific description of an interrupt. that's it, that's the function. ngl it's simple but she's doing it flawlessly 💅

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/irqdomain.h 📁
• struct irq_fwspec_info(9)
• struct irq_domain_ops(9)
• struct irq_domain(9)
• struct irq_domain_info(9)
• irq_domain_create_linear(9)
• irq_create_mapping(9)
• irq_resolve_mapping(9)
• irq_find_mapping(9)
• irq_domain_create_hierarchy(9)
• irq_domain_alloc_irqs(9)

the whole friend group fr fr 🫂 go read all of them, i'll wait 💖

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🌸 ok that's the whole page bestie, you're officially an irq_fwspec girlie now. no notes. 🦋

big slay sign-off: this little masterpiece lives in ./include/linux 💫, and it was dated October 2026 🎀 — mwah, struct irq_fwspec(9), ily, bye 💅✨