STRUCT KOMEDA_COMPONENT(9)

👑 struct komeda_component — a Kernel API Manual moment 💅

okay bestie, welcome to the struct komeda_component(9) page 💖 this is from the Kernel API Manual, and it's genuinely one of those structs that's giving main character energy in the Arm display driver. it's a struct, it's a private obj, it's everything. let's get into it ✨

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🌸 SYNOPSIS 🌸

struct komeda_component {
    struct drm_private_obj obj;
    struct komeda_pipeline *pipeline;
    char name[32];
    u32 __iomem *reg;
    u32 id;
    u32 hw_id;
    u8 max_active_inputs;
    u8 max_active_outputs;
    u32 supported_inputs;
    u32 supported_outputs;
    const struct komeda_component_funcs *funcs;
 };

like, look at her. eleven members, zero notes. slay 🎀

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🦋 Members 🦋

• obj — treat the component as a private obj, that's literally the whole vibe 🔥
• pipeline — the komeda pipeline this component belongs to, i.e. which family she's in 💜
• name — the component name, cute little char name[32], 32 chars of pure identity 🎀
• reg — the component register base, which is initialized by chip and used by chip only. so like, not your business, that's chip's business 🙈
• id — the component id 🆔
• hw_id — the component hw id, which is initialized by chip and used by chip only. again: chip-only zone, we don't touch 💅
• max_active_inputs, max_active_outputs — okay so this is the group-chat part, they share a description:

the maximum number of inputs/outputs that can be active at the same time 🫶

Note: the number isn't the bit number of supported_inputs or supported_outputs, but may be less than it, since the component may not support enabling all supported_inputs/supported_outputs at the same time. no cap, read that twice 👀

• max_active_outputs — maximum number of outputs ✨
• supported_inputs, supported_outputs — these two are also sharing, besties fr fr:

bitmask of BIT(component->id) for the supported inputs/outputs, and it describes the possibilities of how a component is linked into a pipeline 🌈

• supported_outputs — bitmask of supported output componenet ids 🔥 (yes, "componenet" — we keep the spelling exactly as it is, that's canon now, iykyk 😭)
• funcs — the chip functions to access HW, const struct komeda_component_funcs *, don't lose the const bestie 👑

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✨ Description ✨

struct komeda_component describes the data flow capabilities for how to link a component into the display pipeline 🌸 and here's the iconic part: all specified components are subclass of this structure. like, every single one. no exceptions, periodt 💀

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🔍 SEE ALSO 🔍

• Kernel file ./drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h 📁
• struct komeda_component_output(9)
• struct komeda_component_state(9)
• struct komeda_pipeline(9)
• struct komeda_pipeline_state(9)

go read those too, they're literally the supporting cast and they ate 🫶

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and that's the page!! source/version is ./drivers/gpu/drm/arm/display/... and the date on this one is October 2026 — so yeah, she's from the future, iconic behavior ⭐ bye bestie, go link some components 💖🧚