STRUCT RK3X_I2C(9)

💅 struct rk3x_i2c(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct rk3x_i2c, and we're about to get so into it. no cap, this struct is the main character of the Rockchip I2C controller world 👑

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🌸 NAME 🌸

struct rk3x_i2c — literally just the private data of the controller 🫶 that's it, that's the whole vibe check.

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🎀 SYNOPSIS 🎀

here's the whole glow-up, exactly as it lives in the kernel:

struct rk3x_i2c {
    struct i2c_adapter adap;
    struct device *dev;
    const struct rk3x_i2c_soc_data *soc_data;
    void __iomem *regs;
    struct clk *clk;
    struct clk *pclk;
    struct notifier_block clk_rate_nb;
    int irq;
    struct i2c_timings t;
    spinlock_t lock;
    wait_queue_head_t wait;
    bool busy;
    struct i2c_msg *msg;
    u8 addr;
    unsigned int mode;
    bool is_last_msg;
    enum rk3x_i2c_state state;
    unsigned int processed;
    int error;
 };

like, look at her. so organized. so structured. we stan 💜

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🦋 MEMBERS 🦋

every single field, one by one, no skips, no cuts, we're doing the full tour bestie 💖

• adap — the corresponding I2C adapter 🌈
• dev — device for this controller
• soc_data — related soc data struct (chain of structs, iykyk)
• regs — virtual memory area 🧚
• clk — function clk for rk3399 or function & Bus clks for others
• pclk — Bus clk for rk3399 (only for rk3399, not everybody gets one 💅)
• clk_rate_nb — i2c clk rate change notify 📣
• irq — irq number
• t — I2C known timing information ⭐
• lock — spinlock for the i2c bus 🔒
• wait — the waitqueue to wait for i2c transfer ⏳
• busy — the condition for the event to wait for
• msg — current i2c message 💌
• addr — addr of i2c target device
• mode — mode of i2c transfer
• is_last_msg — flag determines whether it is the last msg in this transfer 🏁
• state — state of i2c transfer
• processed — byte length which has been send or received (yes, "send" — we don't touch the original wording, periodt)
• error — error code for i2c transfer 😭

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👑 SEE ALSO 👑

go read the Kernel file ./drivers/i2c/busses/i2c-rk3x.c — that's the mothership 🛸 and then these icons too, fr fr:

• struct i2c_spec_values(9)
• struct rk3x_i2c_calced_timings(9)
• struct rk3x_i2c_soc_data(9)
• rk3x_i2c_start(9)
• rk3x_i2c_stop(9)
• rk3x_i2c_prepare_read(9)
• rk3x_i2c_fill_transmit_buf(9)
• rk3x_i2c_get_spec(9)
• rk3x_i2c_v0_calc_timings(9)
• rk3x_i2c_v1_calc_timings(9)
• rk3x_i2c_clk_notifier_cb(9)
• rk3x_i2c_setup(9)

like, the whole friend group 💜 go say hi.

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💀 reminder that this page is a snapshot from ./drivers/i2c/busses, dated October 2026 — so if the kernel's moved on since then, that's a you problem bestie, check the source 🙈

and that's the page!! mwah 💋 go forth and I2C 🦋✨