STRUCT MCHP_COREI2C_DEV(9)

💖 struct mchp_corei2c_dev(9) 💖

okay so bestie, this is a page from the Kernel API Manual — yes, the actual kernel docs — and it's about struct mchp_corei2c_dev, which is literally the Microchip CoreI2C device private data. it's giving "the lil struct that holds the whole vibe together" and i'm obsessed 🎀

Let me walk you through it, no cap. ✨

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🌸 NAME 🌸

struct mchp_corei2c_dev — Microchip CoreI2C device private data

like, it's the private-data holder for the Microchip CoreI2C driver. that's the whole name. that's the whole job. iconic 🫶

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🦋 SYNOPSIS 🦋

struct mchp_corei2c_dev {
    void __iomem *base;
    struct device *dev;
    struct clk *i2c_clk;
    struct i2c_msg *msg_queue;
    u8 *buf;
    struct completion msg_complete;
    struct i2c_adapter adapter;
    int msg_err;
    int total_num;
    int current_num;
    u32 bus_clk_rate;
    u32 isr_status;
    u16 msg_len;
    u8 addr;
    bool restart_needed;
 };

that's the struct, character for character, don't touch it, she's perfect 💅

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🧚 Members 🧚

okay so this is the part where we meet every single field one by one. no skipping, we're doing a full roll call 👑

• base — pointer to register struct. like, where the registers live. the map, the coordinates, the address of the whole situation 📍
• dev — device reference. your friendly neighborhood struct device, holding it down 🫶
• i2c_clk — clock reference for i2c input clock. the literal heartbeat ⏰
• msg_queue — pointer to the messages requiring sending. the to-do list of messages, lined up and waiting 🎀
• buf — pointer to msg buffer for easier use. a buffer pointer, kept around because it makes life easier. thoughtful queen ✨
• msg_complete — xfer completion object. it's a struct completion and it's literally the "we're done here" signal, the finish line of the transfer 🏁
• adapter — core i2c abstraction. the big-sister abstraction layer that makes this whole thing i2c-shaped 🦋
• msg_err — error code for completed message. if the message fumbled, this is where the receipts live 😭
• total_num — total number of messages to be sent/received. the full count, the whole squad 🌈
• current_num — index of the current message being sent/received. the "who's up right now" counter — main character energy for exactly one message at a time 👑
• bus_clk_rate — current i2c bus clock rate. how fast we're vibing on the bus, as a u32 ⚡
• isr_status — cached copy of local ISR status. a little keep-sake copy of the ISR status, stashed for later 💾
• msg_len — number of bytes transferred in msg. a u16, counting the bytes that actually made it 🍓
• addr — address of the current slave. a u8, i.e. who we're currently talking to 📮
• restart_needed — whether or not a repeated start is required after current message. a bool, and it literally just says "do we need a repeated start after this message, yes or no" 🔁

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/i2c/busses/i2c-microchip-corei2c.c

like yes, go read the actual source, she's right there, it's the whole file, slay 🔥

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k that's the page!! 💜 it came from the ./drivers/i2c/busses directory, the source/version says October 2026, and the page is titled struct mchp_corei2c_dev(9) — so there you go, all caught up, go forth and i2c, bestie 🎀✨💖