linux-kernel - RE: [PATCH 4/8] Thermal: Add Thermal

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Date:	Thu, 20 Dec 2012 07:52:03 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"Zhang, Rui" <rui.zhang@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hongbo.zhang@...aro.org" <hongbo.zhang@...aro.org>,
	"wni@...dia.com" <wni@...dia.com>
Subject: RE: [PATCH 4/8] Thermal: Add Thermal_trip sysfs node

Hi Greg,

Thank you for looking at this.

> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Thursday, December 20, 2012 11:12 AM
> To: R, Durgadoss
> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> hongbo.zhang@...aro.org; wni@...dia.com
> Subject: Re: [PATCH 4/8] Thermal: Add Thermal_trip sysfs node
> 
> On Tue, Dec 18, 2012 at 02:59:33PM +0530, Durgadoss R wrote:
> > This patch adds a thermal_trip directory under
> > /sys/class/thermal/zoneX. This directory contains
> > the trip point values for sensors bound to this
> > zone.
> 
> Eeek, you just broke userspace tools that now can no longer see these
> entries :(
> 
> Why do you need to create a subdirectory?  As you found out, doing so
> isn't the easiest, right?  That is on purpose.

Yes, I observed the complexity.

> 
> I really wouldn't recommend doing this at all, please stick within the
> 'struct device' framework here, don't create new kobjects and hang sysfs
> files off of them.

But, we cannot put all _trip directly under ZoneX directory. We can remove the
thermal_trip directory, and put sensorY_trip under /sys/class/thermal/zoneX/.
But this sensorY_trip needs to be a directory which has four sysfs nodes named,
active, passive, crit, hot.

Rui, What do you think about this ?

The only other way I see, is directly put sensorY_trip_[active/passive/hot/crit]
which will create way too many nodes, under /sys/class/thermal/zoneX/.

Thanks,
Durga

> 
> thanks,
> 
> greg k-h
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