STRUCT I2C_MUX_REG_PLATFORM_DATA(9)

✨ struct i2c_mux_reg_platform_data — the Kernel API Manual tea 💅

okay bestie, so this page is literally called struct i2c_m...latform_data(9) in the Kernel API Manual (yes the header truncates it like that, she's shy), and it's all about one struct. grab a strawberry drink 🍓 and let's go.

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💖 NAME 💖

struct i2c_mux_reg_platform_data — platform-dependent data for i2c-mux-reg. that's it, that's the whole vibe. it's the little bundle of info that tells the register-based i2c mux driver how to behave 🎀

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🌸 SYNOPSIS 🌸

struct i2c_mux_reg_platform_data {
    int parent;
    int base_nr;
    const unsigned int *values;
    int n_values;
    bool little_endian;
    bool write_only;
    u32 idle;
    bool idle_in_use;
    void __iomem *reg;
    resource_size_t reg_size;
 };

like, that's her. that's the struct. no cap, that's the whole shape of it 🦋

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👑 Members 👑

hii so here's every single field, one by one, no skipping, we don't do that here 💅

• parent — the parent I2C bus adapter number. i.e. which bus this mux is hanging off of 🫶
• base_nr — base I2C bus number to number the adapters from, or zero for dynamic numbering. so you either pick a starting number or you let the kernel do its little thing ✨
• values — array of value for each channel. one value per channel, matching outfits basically 🌈
• n_values — number of multiplexer channels. how many channels we got, periodt 💀
• little_endian — indicating if the register is in little endian. byte order check, we love a flag that's honest 🎀
• write_only — reading the register is not allowed by hardware. so don't try to read it, the hardware said no 🙈
• idle — value to write to the mux when idle. the mux's little rest state 😴
• idle_in_use — indicate if idle value is in use. is the idle value actually doing something or is it just sitting there 🔥
• reg — virtual address of the register to switch channel. this is the register, the main character ⭐
• reg_size — register size in bytes. how chunky the register is 🧚

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🦋 SEE ALSO 🦋

• Kernel file ./include/linux/platform_data/i2c-mux-reg.h — go look at the header bestie, iykyk

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and that's the whole page, we ate and left no crumbs 👑

💜 cute lil sign-off: this one lives under ./include/linux/platform_data, and it's dated October 2026. screenshot it, frame it, whatever. bye bestie! 🎀✨