Common Clock Framework: How to use it
summary
Common Clock Framework is part of mainline since kernel 3.4 and is now the required clock API for new ARM SoCs; the talk shows how to register hardware clocks (use clk_register), wire parent/child trees, and export clocks to device tree consumers with of_clk_add_provider. It walks the core call flow for clock_set_rate (global mutex, walk to topmost change, notify, call hw ops), details the five base clocks and prepare/enable/disable semantics, and demos real ARM SoC examples.
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chapters (4)
- 0:00Start
- 8:12Implementation of the CCF Core
- 24:09Hardware clock operations device tree
- 35:48How device drivers use the CCF
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