STRUCT DPLL_DEVICE(9)

💖 struct dpll_device — the kernel API glow-up you didn't know you needed 💖

okay so bestie, this is a page from the kernel API manual (that's the 9 section vibe, iykyk ✨) and it's literally all about struct dpll_device — the lil' data home where a DPLL device keeps its internal stuff. no cap, it's giving "backstage pass to the DPLL subsystem" energy 🎀

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✨ NAME ✨

struct dpll_device — the struct that stores DPLL device internal data 🫶

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🌸 SYNOPSIS 🌸

here's the whole struct, and yes you're gonna want to read it exactly as written, character for character, because kernel code does not do "close enough" 💅

struct dpll_device {
    u32 id;
    u32 device_idx;
    u64 clock_id;
    struct module *module;
    enum dpll_type type;
    struct xarray pin_refs;
    refcount_t refcount;
    struct ref_tracker_dir refcnt_tracker;
    struct list_head registration_list;
 };

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🦋 Members 🦋

okay so let's go member by member, because every single one of these is iconic in its own way ⭐

• id — the unique id number for this device, and it's handed out by the dpll subsystem itself 👑
• device_idx — the id that the dev driver gave it 🎀
• clock_id — the unique identifier (clock_id) of a dpll 🕰️
• module — the module of the creator 🌈
• type — the type of a dpll 🔥
• pin_refs — this one stores the pins registered within a dpll 📌
• refcount — literally the refcount, that's it, that's the member 💀
• refcnt_tracker — the ref_tracker directory used for debugging reference leaks 🙈 (yes bestie, it's a whole debugging situation)
• registration_list — the list of registered ops and priv data of dpll owners 🫶

lowkey a serve that refcnt_tracker exists purely to catch reference leaks — do not sleep on it, leaks are the villain of this story 😭

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💜 SEE ALSO 💜

• Kernel file ./drivers/dpll/dpll_core.h struct dpll_pin(9), struct dpll_pin_ref(9)

go read those too, the whole dpll family is honestly a vibe 🧚

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and that's the page, bestie!! this one lives in ./drivers/dpll, it's dated October 2026, and it's filed under struct dpll_device(9) in the Kernel API Manual — periodt 💅✨🍓