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