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| From | Punit Agrawal <punit.agrawal@arm.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 01/10] devicetree: bindings: Add optional dynamic-power-coefficient property |
| Date | Mon, 03 Aug 2015 17:30:01 +0200 |
| Message-ID | <pTpQB-71w-5@gated-at.bofh.it> (permalink) |
| References | <pTpQB-71w-3@gated-at.bofh.it> |
| X-Original-To | linux-pm@vger.kernel.org |
| X-Mailer | git-send-email 2.1.4 |
| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 51 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | Punit Agrawal <punit.agrawal@arm.com>, lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, liviu.dudau@arm.com, viresh.kumar@linaro.org, edubezval@gmail.com, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com> |
| X-Original-Date | Mon, 3 Aug 2015 16:22:49 +0100 |
| X-Original-Message-ID | <1438615378-14241-2-git-send-email-punit.agrawal@arm.com> |
| X-Original-References | <1438615378-14241-1-git-send-email-punit.agrawal@arm.com> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1198942 |
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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 dynamic-power-coefficient property represents an indicative
running time dynamic power coefficient in fundamental 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>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
---
Documentation/devicetree/bindings/arm/cpus.txt | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index d6b794c..c32bfac 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -239,6 +239,21 @@ 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 an indicative
+ running time dynamic power coefficient in
+ fundamental units of mW/MHz/uVolt^2.
+
+ The dynamic energy consumption of the CPU
+ is proportional to the square of the
+ Voltage (V) and the clock frequency (f).
+
+ 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 {
--
2.1.4
--
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[PATCH v2 01/10] devicetree: bindings: Add optional dynamic-power-coefficient property Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200
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