STRUCT MHUV2(9)

🌸 NAME 🌸

struct mhuv2 — the MHUv2 mailbox controller data bestie, like literally the struct that holds all the deets 💅

ok so this page lives in the Kernel API Manual, section 9 (iykyk, that's the kernel API girlies) ✨

✨ SYNOPSIS ✨

Here's the whole vibe, every single line, no cap:

struct mhuv2 {
    struct mbox_controller mbox;
    union {
      struct mhu2_send_frame_reg __iomem *send;
      struct mhu2_recv_frame_reg __iomem *recv;
    };
    enum mhuv2_frame frame;
    unsigned int irq;
    unsigned int windows;
    unsigned int minor;
    unsigned int length;
    u32 *protocols;
    spinlock_t doorbell_pending_lock;
 };

🎀 Members 🎀

ok so now let's go through every member one by one, because they all matter and we're not skipping a single one 🫶

• mbox — the mailbox controller that belongs to the MHU frame. it's giving main character energy tbh 👑
• {unnamed_union} — an anonymous union. yeah she has no name. mysterious. iconic. 💜
• send — base address of the register mapping region 🔥
• recv — also the base address of the register mapping region. (yes, same description as send — they live in that same anonymous union, so it's one address, two looks 😭)
• frame — the frame type, and it's either RECEIVER_FRAME or SENDER_FRAME — pick your fighter 🦋
• irq — the interrupt. that's it. that's the whole member. ⭐
• windows — the channel windows that the platform implements 🪟✨
• minor — minor version of the controller, little baby version number 🍓
• length — length of the protocols array, measured in bytes 📏
• protocols — raw protocol information, derived from the device tree 🌈
• doorbell_pending_lock — a spinlock that is required for correct operation of the Tx interrupt for doorbells. not optional, bestie, don't be out here removing it 💀

🌸 SEE ALSO 🌸

• the kernel file ./drivers/mailbox/arm_mhuv2.c 👀
• struct mhuv2_protocol_ops(9) — go read her next, she's the sequel 💖

and that's the whole page!! mwah 💋 this one came from ./drivers/mailbox, dated October 2026 — slay, go read the source, ily, bye 🧚‍♀️💜