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Commit 3be3f8f3 authored by Punit Agrawal's avatar Punit Agrawal Committed by Rafael J. Wysocki
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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: default avatarPunit Agrawal <punit.agrawal@arm.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 2dd3e724

Documentation/devicetree/bindings/arm/cpus.txt

+17 −0
Original line number Diff line number Diff line
@@ -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 {