RFC: API to change CPU frequency #93526
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Introduce a simple framework to select a CPU frequency at runtime. CPU frequency is selected in one of two methods: by ID or by load. The ID corresponds to an entry in the DTS' cpu-freq property. The load thresholds and corresponding frequencies are also defined in the cpu-freq property. CPU frequency selection can be applied to one or more CPUs via a bitmask. If selection is done by load (the calculation of which is beyond the scope of this), it searches the DTS defined frequency-threshold pairs for the first one that has a threshold less than the specified load. Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
A simple set of tests to demo how to use the propsed CPU frequency selection model. Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
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Hey @peter-mitsis wondering what the relationship between this PR and #93461 is. I think there may be some overlap. |
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@seankyer - I've been tinkering on this for a little while before your RFC. There is definitely some overlap, but I think your approach is cleaner. |
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I know that there have been a few proposals going around recently about controlling CPU clock frequency at runtime.
This is a proposal for a very simple interface.
General gist:
The DTS can define sets of CPU frequency and load threshold pairs. At runtime a selection of CPUs can have their CPU frequency set either manually (by specifying an ID that corresponds to a DTS entry), or by load. (The calculation of the load is outside the scope of this). When done by load, it picks the first frequency whose threshold is less than the supplied 'load'.