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PM / OPP: improve introductory documentation

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Make Operating Performance Points (OPP) library introductory chapter
a little more reader-friendly. Split the chapter into two sections,
highlight the definition with an example and minor rewording to be
verbose.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nishanth Menon 2013-02-26 23:53:02 +00:00 committed by Rafael J. Wysocki
parent e5dde92cb2
commit 4b87581036
1 changed files with 20 additions and 5 deletions
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Documentation/power/opp.txt
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@ -1,6 +1,5 @@
*=============*
* OPP Library *
*=============*
Operating Performance Points (OPP) Library
==========================================
(C) 2009-2010 Nishanth Menon <nm@ti.com>, Texas Instruments Incorporated
@ -16,15 +15,31 @@ Contents
1. Introduction
===============
1.1 What is an Operating Performance Point (OPP)?
Complex SoCs of today consists of a multiple sub-modules working in conjunction.
In an operational system executing varied use cases, not all modules in the SoC
need to function at their highest performing frequency all the time. To
facilitate this, sub-modules in a SoC are grouped into domains, allowing some
domains to run at lower voltage and frequency while other domains are loaded
more. The set of discrete tuples consisting of frequency and voltage pairs that
domains to run at lower voltage and frequency while other domains run at
voltage/frequency pairs that are higher.
The set of discrete tuples consisting of frequency and voltage pairs that
the device will support per domain are called Operating Performance Points or
OPPs.
As an example:
Let us consider an MPU device which supports the following:
{300MHz at minimum voltage of 1V}, {800MHz at minimum voltage of 1.2V},
{1GHz at minimum voltage of 1.3V}
We can represent these as three OPPs as the following {Hz, uV} tuples:
{300000000, 1000000}
{800000000, 1200000}
{1000000000, 1300000}
1.2 Operating Performance Points Library
OPP library provides a set of helper functions to organize and query the OPP
information. The library is located in drivers/base/power/opp.c and the header
is located in include/linux/opp.h. OPP library can be enabled by enabling