From: "Chen-Yu Tsai (Moxa)" <wens@csie.org>
To: nobuhiro1.iwamatsu@toshiba.co.jp, pavel@denx.de
Cc: cip-dev@lists.cip-project.org, JohnsonCH.Chen@moxa.com
Subject: [cip-dev] [PATCH 4.4.y-cip v2 12/15] devicetree: bindings: Add optional dynamic-power-coefficient property
Date: Mon, 8 Jun 2020 17:14:29 +0800 [thread overview]
Message-ID: <20200608091432.15366-13-wens@csie.org> (raw)
In-Reply-To: <20200608091432.15366-1-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
[-- Attachment #2: Type: text/plain, Size: 419 bytes --]
-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#4757): https://lists.cip-project.org/g/cip-dev/message/4757
Mute This Topic: https://lists.cip-project.org/mt/74748506/4520388
Group Owner: cip-dev+owner@lists.cip-project.org
Unsubscribe: https://lists.cip-project.org/g/cip-dev/leave/8129055/727948398/xyzzy [cip-dev@archiver.kernel.org]
-=-=-=-=-=-=-=-=-=-=-=-
next prev parent reply other threads:[~2020-06-08 12:01 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 9:14 [cip-dev] [PATCH 4.4.y-cip v2 00/15] PM / OPP v2 & cpufreq backports part 1 Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 01/15] PM / OPP: Add debugfs support Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 02/15] PM / OPP: Add "opp-supported-hw" binding Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 03/15] PM / OPP: Add {opp-microvolt|opp-microamp}-<name> binding Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 04/15] PM / OPP: Remove 'operating-points-names' binding Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 05/15] PM / OPP: Rename OPP nodes as opp@<opp-hz> Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 06/15] PM / OPP: Add missing doc comments Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 07/15] PM / OPP: Parse 'opp-supported-hw' binding Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 08/15] PM / OPP: Parse 'opp-<prop>-<name>' bindings Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 09/15] PM / OPP: Fix parsing of opp-microvolt and opp-microamp properties Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 10/15] PM / OPP: Set cpu_dev->id in cpumask first Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 11/15] PM / OPP: Use snprintf() instead of sprintf() Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` Chen-Yu Tsai (Moxa) [this message]
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 13/15] cpufreq-dt: Supply power coefficient when registering cooling devices Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 14/15] cpufreq-dt: fix handling regulator_get_voltage() result Chen-Yu Tsai (Moxa)
2020-06-08 9:14 ` [cip-dev] [PATCH 4.4.y-cip v2 15/15] cpufreq: cpufreq-dt: avoid uninitialized variable warnings: Chen-Yu Tsai (Moxa)
2020-06-08 9:30 [cip-dev] [PATCH 4.4.y-cip v2 00/15] PM / OPP v2 & cpufreq backports part 1 Chen-Yu Tsai (Moxa)
2020-06-08 9:30 ` [cip-dev] [PATCH 4.4.y-cip v2 12/15] devicetree: bindings: Add optional dynamic-power-coefficient property Chen-Yu Tsai (Moxa)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200608091432.15366-13-wens@csie.org \
--to=wens@csie.org \
--cc=JohnsonCH.Chen@moxa.com \
--cc=cip-dev@lists.cip-project.org \
--cc=nobuhiro1.iwamatsu@toshiba.co.jp \
--cc=pavel@denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.