From: "Chen-Yu Tsai (Moxa)" <wens@csie.org>
To: nobuhiro1.iwamatsu@toshiba.co.jp, pavel@denx.de
Cc: Punit Agrawal <punit.agrawal@arm.com>,
cip-dev@lists.cip-project.org, JohnsonCH.Chen@moxa.com,
Rob Herring <robh@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Chen-Yu Tsai <wens@csie.org>
Subject: [cip-dev] [4.4.y-cip 12/15] devicetree: bindings: Add optional dynamic-power-coefficient property
Date: Thu, 4 Jun 2020 11:18:26 +0800 [thread overview]
Message-ID: <20200604031829.3254-13-wens@csie.org> (raw)
In-Reply-To: <20200604031829.3254-1-wens@csie.org>
[-- Attachment #1: Type: text/plain, Size: 2037 bytes --]
From: Punit Agrawal <punit.agrawal@arm.com>
commit 3be3f8f36e7349006f19c8c8f0d686e98462a993 upstream.
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>
Signed-off-by: Chen-Yu Tsai (Moxa) <wens@csie.org>
---
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 9ef9a2089a5e7..6b1d8ebb94b7b 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -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 {
--
2.27.0.rc0
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next prev parent reply other threads:[~2020-06-04 11:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 3:18 [cip-dev] [4.4.y-cip 00/15] PM / OPP v2 & cpufreq backports part 1 Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 01/15] PM / OPP: Add debugfs support Chen-Yu Tsai (Moxa)
2020-06-04 4:47 ` Viresh Kumar
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 02/15] PM / OPP: Add "opp-supported-hw" binding Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 03/15] PM / OPP: Add {opp-microvolt|opp-microamp}-<name> binding Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 04/15] PM / OPP: Remove 'operating-points-names' binding Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 05/15] PM / OPP: Rename OPP nodes as opp@<opp-hz> Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 06/15] PM / OPP: Add missing doc comments Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 07/15] PM / OPP: Parse 'opp-supported-hw' binding Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 08/15] PM / OPP: Parse 'opp-<prop>-<name>' bindings Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 09/15] PM / OPP: Fix parsing of opp-microvolt and opp-microamp properties Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 10/15] PM / OPP: Set cpu_dev->id in cpumask first Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 11/15] PM / OPP: Use snprintf() instead of sprintf() Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` Chen-Yu Tsai (Moxa) [this message]
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 13/15] cpufreq-dt: Supply power coefficient when registering cooling devices Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 14/15] cpufreq-dt: fix handling regulator_get_voltage() result Chen-Yu Tsai (Moxa)
2020-06-04 3:18 ` [cip-dev] [4.4.y-cip 15/15] cpufreq: cpufreq-dt: avoid uninitialized variable warnings: Chen-Yu Tsai (Moxa)
2020-06-04 3:45 ` [cip-dev] [4.4.y-cip 00/15] PM / OPP v2 & cpufreq backports part 1 Chen-Yu Tsai (Moxa)
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