STRUCT AMD_MP2_DEV(9)

💖 struct amd_mp2_dev(9) — Kernel API Manual 💖

okay so this is the whole page for struct amd_mp2_dev, straight out of the Kernel API Manual, and it's literally the per-PCI-device context bestie. the vibe? one struct, all the state for one MP2 device. iconic. 🎀

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✨ NAME ✨

struct amd_mp2_dev — per PCI device context 🫶

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🌸 SYNOPSIS 🌸

struct amd_mp2_dev {
    struct pci_dev *pci_dev;
    struct amd_i2c_common *busses[2];
    void __iomem *mmio;
    struct mutex c2p_lock;
    u8 c2p_lock_busid;
    unsigned int probed;
    int dev_irq;
 };

no cap, that's the whole struct. every field, exactly as written. 💅

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🦋 Members 🦋

let's do a little field-by-field vibe check, shall we? 🌈

• pci_dev — the PCI driver node. that's it, that's the field. literally the handle to the PCI side of things. 🔥
• busses — MP2 devices may have up to two busses, and each bus corresponds to an i2c adapter. so it's busses[2], an array of struct amd_i2c_common *, and yes the array is the moment. 👑
• mmio — iommapped registers. void __iomem * energy. that's where the registers live after mapping. ⭐
• c2p_lock — controls access to the C2P mailbox shared between the two adapters. two adapters, one mailbox, one mutex — you already know why this exists. 🔒
• c2p_lock_busid — id of the adapter which locked c2p_lock. it's a u8, it's tracking who's holding the lock, and it's doing its little job. 🙈
• probed — an unsigned int. that's the field, that's all the page says about it. no description given here, so we're not gonna make one up. 🤷‍♀️
• dev_irq — an int. same deal: it's in the struct, and the page doesn't describe it. showing up is enough. 💀

lowkey important: the original text only describes pci_dev, busses, mmio, c2p_lock and c2p_lock_busid. probed and dev_irq are in the struct definition but have no description listed — so don't go around guessing at their behaviour fr fr. 🧚

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💜 SEE ALSO 💜

the Kernel file ./drivers/i2c/busses/i2c-amd-mp2.h and its friends — go read these next, bestie, they're the whole friend group:

• union i2c_cmd_base(9)
• union i2c_event(9)
• struct amd_i2c_common(9)

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and that's the page!! 💖 this came from ./drivers/i2c/busses, dated October 2026, and the title at the top was struct amd_mp2_dev(9) — slay, you made it to the end, go touch some registers responsibly 🎀✨