STRUCT I2C_DEV_DESC(9)

💅 struct i2c_dev_desc(9) — the Kernel API Manual, bestie edition 🎀

okay so welcome to the Kernel API Manual, section 9, and today's main character is struct i2c_dev_desc — literally the I2C device descriptor. buckle up, it's short but it's iconic ✨

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🌸 NAME 🌸

struct i2c_dev_desc — I2C device descriptor. that's it, that's the vibe. no cap 💖

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✨ SYNOPSIS ✨

here's the whole thing, bestie, look at her:

struct i2c_dev_desc {
    struct i3c_i2c_dev_desc common;
    struct i2c_client *dev;
    u16 addr;
    u8 lvr;
 };

literally four fields and she's running the whole plot 🫶

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🦋 Members 🦋

okay let's meet the cast, one by one:

• common — the common part of the I2C device descriptor. like, the shared friend group of the descriptor world 💅
• dev — the I2C device object that got registered to the I2C framework. she's official, she's on the list 👑
• addr — the I2C device address. how you find her in the crowd 🎀
• lvr — the LVR (Legacy Virtual Register) that the I3C core needs so it knows about the I2C device's limitations. like a little note that says "hey, this one can't do everything" 😭

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💜 Description 💜

okay so picture this: every single I2C device connected on the bus gets her own i2c_dev_desc. no sharing, no copying, one each, periodt 💀

the core creates this object, and later it gets attached to the controller using struct_i3c_master_controller->ops->attach_i2c_dev. the way it literally just gets handed over 🤝

and struct_i2c_dev_desc is the internal representation of an I2C device that's connected on an I3C bus — like, the behind-the-scenes version, the understudy, the backstage pass 🧚

she also gets passed to all the struct_i3c_master_controller_ops hooks. everyone wants a piece of her, honestly 💖

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🔥 SEE ALSO 🔥

the whole friend group, no one left out, iykyk:

• Kernel file ./include/linux/i3c/master.h struct i3c_i2c_dev_desc(9)
• struct i2c_dev_boardinfo(9)
• struct i3c_ibi_slot(9)
• struct i3c_device_ibi_info(9)
• struct i3c_dev_boardinfo(9)
• struct i3c_dev_desc(9)
• struct i3c_device(9)
• enum i3c_bus_mode(9)
• enum i3c_open_drain_speed(9)
• enum i3c_addr_slot_status(9)
• struct i3c_bus(9)
• struct i3c_master_controller_ops(9)
• struct i3c_master_controller(9)
• i3c_bus_for_each_i2cdev(9)
• i3c_bus_for_each_i3cdev(9)
• struct i3c_dma(9)
• i3c_dev_get_master_data(9)
• i3c_dev_set_master_data(9)
• i2c_dev_get_master_data(9)
• i2c_dev_set_master_data(9)
• i3c_dev_get_master(9)
• i2c_dev_get_master(9)
• i3c_master_get_bus(9)

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bestie reminder: these page refs are exactly as written, don't come for me if you think one looks weird 💅

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🌈 that's the whole page, you ate that honestly. this came to you straight from the source file ./include/linux/i3c, dated October 2026, and it's filed under struct i2c_dev_desc(9). go forth and describe some I2C devices, queen 👑💖