Re: [PATCH 2/5] clk: notifier handler for dynamic voltage scaling

Mike Turquette <mturquette@...> writes:

Dynamic voltage and frequency scaling (dvfs) is a common power saving technique in many of today's modern processors. This patch introduces a common clk rate-change notifier handler which scales voltage appropriately whenever clk_set_rate is called on an affected clock.

For DVFS to be useful, we might need to be notified on "clk_enable" and "clk_disable" since there are cases that driver will disable or enable clock directly but not calling clk_set_rate. Do you agree that notifier in common clock need to be improved?

There are three prerequisites to using this feature:

1. the affected clocks must be using the common clk framework
2. voltage must be scaled using the regulator framework
3. clock frequency and regulator voltage values must be paired via the

OPP library