On Mon, Nov 16, 2015 at 07:30:23PM +0000, Punit Agrawal wrote:
> 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@xxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> Documentation/devicetree/bindings/arm/cpus.txt | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> index 3a07a87..6aca64f 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 {
> --
> 2.6.2
>
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