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

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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.

Change-Id: Ib208ff2f83ee45911e846f940952d765ae8c974e
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>
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
(cherry picked from commit 3be3f8f36e)
This commit is contained in:
Punit Agrawal 2015-11-17 12:06:21 +00:00 • committed by Gerrit Code Review
commit a772af0b70
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17
Documentation/devicetree/bindings/arm/cpus.txt
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@ -243,6 +243,23 @@ 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 {