Rockchip cpu avs device tree bindings
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Under the same frequency, the operating voltage tends to decrease with
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increasing leakage. so it is necessary to adjust opp's voltage according
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to leakage for power.
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Required properties:
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- cluster-id: At runtime, the platform can find a cpu's cluster_id
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according to it's cpu_id and match cluster-id property.
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- min-volt: The minimum voltage in uV. Even though opp's voltage will be
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adjusted, it must be bigger than or equal to the minimum.
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- min-freq: The minimum frequency in KHz. If an opp's frequency is bigger
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than or equal to the minimum, its volatge will be adjusted.
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- leakage-adjust-volt: The property is an array of 3-tuples items, and
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each item consists of leakage and voltage like
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<min-leakage-mA max-leakage-mA volt-uV>.
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min-leakage: minimum leakage in mA, ranges from 0 to 254.
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max-leakage: maximum leakage in mA, ranges from 0 to 254.
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volt: voltage offset in uV to apply to the opp table entries.
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- nvmem-cells: A phandle to the leakage data provided by efuse.
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- nvmem-cell-names: Should be "cpu_leakage".
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Example:
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cpu_avs: cpu-avs {
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cluster0-avs {
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cluster-id = <0>;
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min-volt = <800000>; /* uV */
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min-freq = <408000>; /* KHz */
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leakage-adjust-volt = <
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/* mA mA uV */
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0 254 0
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>;
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nvmem-cells = <&cpul_leakage>;
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nvmem-cell-names = "cpu_leakage";
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};
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cluster1-avs {
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cluster-id = <1>;
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min-volt = <800000>; /* uV */
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min-freq = <408000>; /* KHz */
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leakage-adjust-volt = <
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/* mA mA uV */
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0 254 0
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>;
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nvmem-cells = <&cpub_leakage>;
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nvmem-cell-names = "cpu_leakage";
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};
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};
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