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authorViresh Kumar <viresh.kumar@linaro.org>2018-10-29 15:13:05 +0530
committerRob Herring <robh@kernel.org>2018-10-30 17:14:36 -0500
commit204c881e96e435606451e8a167cdb5a12fafd32a (patch)
tree51c0bd50d72891b4658e14f6f137f3f9f530f36f /Documentation
parentd061864b89c3234b53d8884027b0cd6f06bd3149 (diff)
downloadlinux-204c881e96e435606451e8a167cdb5a12fafd32a.tar.bz2
dt-bindings: arm: Explain capacities-dmips-mhz calculations in example
The example contains two values for the capacity currently, 446 in text and 578 in code. The numbers are all correct but can confuse some of the readers. This patch tries to explain how the numbers are calculated to avoid same confusion going forward. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/arm/cpu-capacity.txt8
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/arm/cpu-capacity.txt b/Documentation/devicetree/bindings/arm/cpu-capacity.txt
index 9b5685a1d15d..84262cdb8d29 100644
--- a/Documentation/devicetree/bindings/arm/cpu-capacity.txt
+++ b/Documentation/devicetree/bindings/arm/cpu-capacity.txt
@@ -59,9 +59,11 @@ mhz values (normalized w.r.t. the highest value found while parsing the DT).
===========================================
Example 1 (ARM 64-bit, 6-cpu system, two clusters):
-capacities-dmips-mhz are scaled w.r.t. 1024 (cpu@0 and cpu@1)
-supposing cluster0@max-freq=1100 and custer1@max-freq=850,
-final capacities are 1024 for cluster0 and 446 for cluster1
+The capacities-dmips-mhz or DMIPS/MHz values (scaled to 1024)
+are 1024 and 578 for cluster0 and cluster1. Further normalization
+is done by the operating system based on cluster0@max-freq=1100 and
+custer1@max-freq=850, final capacities are 1024 for cluster0 and
+446 for cluster1 (576*850/1100).
cpus {
#address-cells = <2>;