本文探讨了I2C总线系统中主从设备的概念，详细介绍了Linux环境下如何为I2C主控制器和从设备设计驱动程序。主控制器驱动负责向从设备发送指令和数据，而从设备驱动则关注于访问寄存器和数据。文章通过一张图表清晰地展示了客户端（从设备）与适配器（主设备）之间的交互，并指导如何在设备树中添加这些组件。
I2C has Master and Slave.
Master could be SoC I2C controller.
Slave could be EEPROM, LCD, Audio Codec.
So Linux should provide master driver and slave driver.
Master driver: how to send cmd/data to slave device
Slave driver: how to access slave register, data.
borrow a picture from https://blog.youkuaiyun.com/wangpengqi/article/details/17711165
In this picture, Client is slave, adaptor is master. Then everything is easy to understand.
To add Master/adaptor, you need add it in the device tree based on the SoC spec info.
To add Slave/client, you need add it in the device tree as subnode of master/adaptor node.
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