Multifunction Device Drivers(多功能设备Linux下驱动开发）
先来一个英文简介：
Multifunction devices embed several functions (e.g. GPIOs, touchscreens, keyboards, current regulators, power management chips, etc...) in one single integrated circuit. They usually talk to the main CPU through one or more IRQ lines and low speed data busses (SPI, I2C, etc..). They appear as one single device to the main system through the data bus and the MFD framework allows for sub devices (a.k.a. functions) to appear as discrete platform devices. MFDs are typically found on embedded platforms.
| Multifunction devices embed several functions (e.g. GPIOs, touchscreens, keyboards, current regulators, power management chips, etc...) in one single integrated circuit. They usually talk to the main CPU through one or more IRQ lines and low speed data busses (SPI, I2C, etc..). They appear as one single device to the main system through the data bus and the MFD framework allows for sub devices (a.k.a. functions) to appear as discrete platform devices. MFDs are typically found on embedded platforms. | 多功能设备中嵌入了一些功能（如个GPIO，触摸屏，键盘，电流调节器，电源管理芯片等。）在一个单片集成电路。他们通常会谈论到主CPU通过一个或多个的IRQ线和低速数据总线（SPI，I2C，等等）。它们显示为一个单一的设备，主系统通过数据总线，和MFD框架允许出现的独立平台设备的子设备（又名功能）。通常只有在嵌入式平台上的MFD。 |
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英文简介转自：http://blog.micro-studios.com/?p=309
精简Android-kernel时出查找：
知其功能，但仍不知如何取舍。。。
