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Devfreq CPUfreq governor
devfreq-cpufreq is a parent device that contains one or more child devices.
Each child device provides CPU frequency to device frequency mapping for a
specific device. Examples of devices that could use this are: DDR, cache and
CCI.
Parent device name shall be "devfreq-cpufreq".
Required child device properties:
- cpu-to-dev-map, or cpu-to-dev-map-<X>:
A list of tuples where each tuple consists of a
CPU frequency (KHz) and the corresponding device
frequency. CPU frequencies not listed in the table
will use the device frequency that corresponds to the
next rounded up CPU frequency.
Use "cpu-to-dev-map" if all CPUs in the system should
share same mapping.
Use cpu-to-dev-map-<cpuid> to describe different
mappings for different CPUs. The property should be
listed only for the first CPU if multiple CPUs are
synchronous.
- target-dev: Phandle to device that this mapping applies to.
Example:
devfreq-cpufreq {
cpubw-cpufreq {
target-dev = <&cpubw>;
cpu-to-dev-map =
< 300000 1144 >,
< 422400 2288 >,
< 652800 3051 >,
< 883200 5996 >,
< 1190400 8056 >,
< 1497600 10101 >,
< 1728000 12145 >,
< 2649600 16250 >;
};
cache-cpufreq {
target-dev = <&cache>;
cpu-to-dev-map =
< 300000 300000 >,
< 422400 422400 >,
< 652800 499200 >,
< 883200 576000 >,
< 960000 960000 >,
< 1497600 1036800 >,
< 1574400 1574400 >,
< 1728000 1651200 >,
< 2649600 1728000 >;
};
};
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