linux-kernel - Re: [PATCH v2 3/3] PM / DEVFREQ: add sysfs interface (including user tickling)

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Date:	Wed, 18 May 2011 09:43:08 +0900
From:	MyungJoo Ham <myungjoo.ham@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Greg KH <gregkh@...e.de>, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...ena.org.uk>,
	Jiejing Zhang <kzjeef@...il.com>, Pavel Machek <pavel@....cz>,
	Colin Cross <ccross@...gle.com>, Nishanth Menon <nm@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH v2 3/3] PM / DEVFREQ: add sysfs interface (including user tickling)

On Wed, May 18, 2011 at 7:41 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Tuesday, May 17, 2011, MyungJoo Ham wrote:
>> On Thu, May 12, 2011 at 7:55 AM, Greg KH <gregkh@...e.de> wrote:
>> > On Wed, May 11, 2011 at 04:58:43PM +0900, MyungJoo Ham wrote:
>> >> 1. System-wide sysfs interface
>> >> - tickle_all  R: number of tickle_all execution
>> >>               W: tickle all devfreq devices
>> >> - min_interval        R: devfreq monitoring base interval in ms
>> >> - monitoring  R: shows whether devfreq monitoring is active or
>> >>   not.
>> >>
>> >> 2. Device specific sysfs interface
>> >> - tickle      R: number of tickle execution for the device
>> >>               W: tickle the device
>> >
>> > Any sysfs file change/addition/removal needs to have a
>> > Documentation/ABI/ entry as well.  Please add that to this patch instead
>> > of burying it in the changelog entry, where no one will be able to find
>> > it in the future.
>> >
>> > thanks,
>> >
>> > greg k-h
>> >
>>
>> Sure, I'll add Documentation/ABI/testing/* entries.
>>
>> However, would it be appropriate for "1. System-wide sysfs interface"
>> to be in "sysfs-class-power" and for "2. Device specific sysfs
>> interface" to be in "sysfs-devices-devfreq"?
>>
>> System-wide sysfs interface is in /sys/class/power/devfreq/* and
>
> Hmm.  Why not to use /sys/power/ that's already there?

Ah.. that was my mistake. I'd put it at /sys/power/devfreq/*.

Thank you for cleaning that up.

>
>> Device specific sysfs interface is in /sys/...DEVICE.../devfreq/* .
>
> Thanks,
> Rafael
>

Cheers!
- MyungJoo
-- 
MyungJoo Ham, Ph.D.
Mobile Software Platform Lab,
Digital Media and Communications (DMC) Business
Samsung Electronics
cell: 82-10-6714-2858
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