linux-kernel - Re: [PATCH 3/3] gpiolib: use chip->names for symlinks, always use gpioN for device names

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Message-Id: <1260508357.12048.217.camel@ben-desktop>
Date:	Fri, 11 Dec 2009 16:12:37 +1100
From:	Ben Nizette <bn@...sdigital.com>
To:	Greg KH <gregkh@...e.de>
Cc:	David Brownell <david-b@...bell.net>,
	Jani Nikula <ext-jani.1.nikula@...ia.com>,
	dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
	dsilvers@...tec.co.uk, ben@...tec.co.uk,
	Artem.Bityutskiy@...ia.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/3] gpiolib: use chip->names for symlinks, always use
 gpioN for device names

On Thu, 2009-12-10 at 19:47 -0800, Greg KH wrote:
> On Thu, Dec 10, 2009 at 07:39:30PM -0800, David Brownell wrote:
> > On Wednesday 09 December 2009, Jani Nikula wrote:
> > > While the device names are now unique again, collisions in chip->names
> > > will still prevent duplicates from being exported to sysfs.
> > 
> > That's why I was never a real fan of chip->names...

Yea, poor idea indeed.

> > 
> > IMO a "good" solution in this space needs to accept that
> > those names are not going to be globally unique ... but
> > that they'll be unique within some context, of necessity.
> > 
> > If Greg doesn't want to see those names under classes,
> > so be it ... but where should they then appear?
> 
> As a sysfs file within the device directory called 'name'?  Then just
> grep through the tree to find the right device, that also handles
> duplicates just fine, right?

Well it bunts the handling of duplicates to who ever is grepping but
yea, sounds good.  The user script can sanity-check it's results against
the controlling gpio-chip if need be.  In fact, maybe symlink from
gpioN/chip back to gpio-chipY could be useful?  A bit redundant though,
as you can check using the number ranges..

In fact I thought I had a patch to create /sys/class/gpio/gpioN/name at
some stage..  Can't find it though, oh well.

	--Ben.


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