STRUCT STM32F7_I2C_DEV(9)

💅 struct stm32f7_i2c_dev(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're digging around in the Kernel API Manual (that's the manual name, don't @ me) and you bump into struct stm32f7_i2c_dev — literally the private data of the controller. it's giving backstage pass energy. every field in here is a little piece of the I2C controller's whole personality, and we're gonna meet all of them, no skipping, fr fr 💖

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✨ NAME ✨

struct stm32f7_i2c_dev — private data of the controller 🫶

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🌸 SYNOPSIS 🌸

struct stm32f7_i2c_dev {
    struct i2c_adapter adap;
    struct device *dev;
    void __iomem *base;
    struct completion complete;
    struct clk *clk;
    unsigned int bus_rate;
    struct i2c_msg *msg;
    unsigned int msg_num;
    unsigned int msg_id;
    struct stm32f7_i2c_msg f7_msg;
    struct stm32f7_i2c_setup setup;
    struct stm32f7_i2c_timings timing;
    struct i2c_client *slave[STM32F7_I2C_MAX_SLAVE];
    struct i2c_client *slave_running;
    struct stm32f7_i2c_regs backup_regs;
    u32 slave_dir;
    bool master_mode;
    struct stm32_i2c_dma *dma;
    bool use_dma;
    struct regmap *regmap;
    u32 fmp_sreg;
    u32 fmp_creg;
    u32 fmp_mask;
    bool wakeup_src;
    bool smbus_mode;
    struct i2c_client *host_notify_client;
    bool analog_filter;
    u32 dnf_dt;
    u32 dnf;
    struct stm32f7_i2c_alert *alert;
    bool atomic;
 };

look at that struct. 30 fields. main character energy, honestly 👑 copy it exactly, every semicolon is sacred 😤

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🦋 Members 🦋

okay bestie, field-by-field tour, no cap:

• adap — I2C adapter for this controller 💫
• dev — device for this controller
• base — virtual memory area
• complete — completion of I2C message (the "we're done here" moment ✨)
• clk — hw i2c clock
• bus_rate — I2C clock frequency of the controller
• msg — Pointer to data to be written
• msg_num — number of I2C messages to be executed
• msg_id — message identifiant (yes, that's spelled that way in the original, i'm not touching it 🙈)
• f7_msg — customized i2c msg for driver usage
• setup — I2C timing input setup
• timing — I2C computed timings
• slave — list of slave devices registered on the I2C bus
• slave_running — slave device currently used (the one on aux rn 🎧)
• backup_regs — backup of i2c controller registers (for suspend/resume)
• slave_dir — transfer direction for the current slave device
• master_mode — boolean to know in which mode the I2C is running (master or slave)
• dma — dma data
• use_dma — boolean to know if dma is used in the current transfer
• regmap — holds SYSCFG phandle for Fast Mode Plus bits
• fmp_sreg — register address for setting Fast Mode Plus bits
• fmp_creg — register address for clearing Fast Mode Plus bits
• fmp_mask — mask for Fast Mode Plus bits in set register
• wakeup_src — boolean to know if the device is a wakeup source ⏰
• smbus_mode — states that the controller is configured in SMBus mode
• host_notify_client — SMBus host-notify client
• analog_filter — boolean to indicate enabling of the analog filter
• dnf_dt — value of digital filter requested via dt
• dnf — value of digital filter to apply
• alert — SMBus alert specific data 🚨
• atomic — boolean indicating that current transfer is atomic

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👀 SEE ALSO 👀

go read the kernel file ./drivers/i2c/busses/i2c-stm32f7.c struct, plus these iconic siblings:

• struct stm32f7_i2c_regs(9)
• struct stm32f7_i2c_spec(9)
• struct stm32f7_i2c_setup(9)
• struct stm32f7_i2c_timings(9)
• struct stm32f7_i2c_msg(9)
• struct stm32f7_i2c_alert(9)

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lowkey a whole family reunion in the i2c-stm32f7 driver 💀 read them all, iykyk

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and that's the page bestie, you ate that 💅✨ sign-off time: this one lives in ./drivers/i2c/busses, dated October 2026, and it's titled struct stm32f7_i2c_dev(9). periodt 🌈💖