linux-kernel - [PATCH 0/2] devfreq: Add sysfs node for representing frequency transition information.

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Date:	Thu, 16 Aug 2012 15:49:25 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Mike Turquette <mturquette@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Xiaoguang Chen <chenxg@...vell.com>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>
Subject: [PATCH 0/2] devfreq: Add sysfs node for representing frequency
 transition information.

This patchset adds sysfs node to devfreq's frame work to measure trasition of frequency on runtime.
It will be created under '/sys/class/devfreq/<device name>/' as the name of 'trans_state'.
It contains transition table which represents total number of transition of each frerquency state to
others and also time spent the state.

--- example for device having 3 frequency levels ----------------------------------------------------
			 <freq level #1>        <freq level #2>       <freq level #3>	   time_spent
* <freq level #1>		              # of freq1 to freq2    # of freq1 to freq3       t1
  <freq level #2>       # of freq2 to freq1			     # of freq2 to freq3       t2
  <freq level #3>       # of freq3 to freq1   # of freq3 to freq2			       t3
 total transition : N
-----------------------------------------------------------------------------------------------------
('*' represents last frequency changed at the time you inspect the node.)

Patch 1: Make sysfs node to DEVFREQ frame work.
Patch 2: Initialize freq_table and max_state in exynos4 devfreq driver to be
	 used for frequency trnasition measurement.

Jonghwa Lee (2):
  devfreq: Add sysfs node for representing frequency transition
    information.
  devfreq: exynos4: Support initialization of freq_table and max_state
    of devfreq's profile.

 drivers/devfreq/devfreq.c     |   89 +++++++++++++++++++++++++++++++++++++++++
 drivers/devfreq/exynos4_bus.c |   30 +++++++++++++-
 include/linux/devfreq.h       |    9 ++++
 3 files changed, 127 insertions(+), 1 deletions(-)

-- 
1.7.4.1

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