**diff options**

author | Punit Agrawal <punit.agrawal@arm.com> | 2015-11-17 12:06:21 +0000 |
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committer | Guodong Xu <guodong.xu@linaro.org> | 2017-06-06 14:23:37 +0800 |

commit | 983c1807b398f5909bd8fd25ae987dc36e655946 (patch) | |

tree | f6a80e88824f77d40103d532fb890db57a1dce94 | |

parent | ddabc5287edc70da82c75a26bff88a93fcb0e275 (diff) | |

download | arm64-stable-rc-983c1807b398f5909bd8fd25ae987dc36e655946.tar.gz |

devicetree: bindings: Add optional dynamic-power-coefficient property

The dynamic power consumption of a device is proportional to the
square of voltage (V) and the clock frequency (f). It can be expressed as
Pdyn = dynamic-power-coefficient * V^2 * f.
The coefficient represents the running time dynamic power consumption in
units of mw/MHz/uVolt^2 and can be used in the above formula to
calculate the dynamic power in mW.
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

-rw-r--r-- | Documentation/devicetree/bindings/arm/cpus.txt | 17 |

1 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt index 3a07a87fef20..6aca64f289b6 100644 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ b/Documentation/devicetree/bindings/arm/cpus.txt @@ -242,6 +242,23 @@ nodes to be present and contain the properties described below. Definition: Specifies the syscon node controlling the cpu core power domains. + - dynamic-power-coefficient + Usage: optional + Value type: <prop-encoded-array> + Definition: A u32 value that represents the running time dynamic + power coefficient in units of mW/MHz/uVolt^2. The + coefficient can either be calculated from power + measurements or derived by analysis. + + The dynamic power consumption of the CPU is + proportional to the square of the Voltage (V) and + the clock frequency (f). The coefficient is used to + calculate the dynamic power as below - + + Pdyn = dynamic-power-coefficient * V^2 * f + + where voltage is in uV, frequency is in MHz. + Example 1 (dual-cluster big.LITTLE system 32-bit): cpus { |