February 20, 2013 San Francisco, California The Linux Foundation Embedded Linux Conference 2013 Common Clock Framework: How to use it By Gregory Clement The common clock framework, which was included in the 3.4 kernel in the beginning of 2012, is now mandatory to support all new ARM SoCs. It is also part of the "one zImage to run them all" big plan of the ARM architecture in the Linux kernel. After an introduction on why we needed this framework and on the problems it solves, we will go through the implementation details of this framework. Then, with real examples, we will focus on how to use this framework to add clock support to a new ARM SoC. We will also show how the device tree is used in this process. The last part of the talk will review how device drivers use this framework, using examples taken from various parts of the kernel.