linux-kernel - Re: [PATCH 2/2 v3] drivers/core/of: Add symlink to device-tree from devices with an OF node

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Date:	Tue, 17 Feb 2015 20:57:08 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Jeremy Kerr <jeremy.kerr@....ibm.com>
Subject: Re: [PATCH 2/2 v3] drivers/core/of: Add symlink to device-tree from
 devices with an OF node

On Tue, Feb 17, 2015 at 07:07:14PM -0600, Rob Herring wrote:
> On Tue, Feb 17, 2015 at 6:25 PM, Benjamin Herrenschmidt
> <benh@...nel.crashing.org> wrote:
> > So I've been annoyed lately with having a bunch of devices such as i2c
> > eeproms (for use by VPDs, server world !) and other bits and pieces that
> > I want to be able to identify from userspace, and possibly provide
> > additional data about from FW.
> >
> > Basically, it boils down to correlating the sysfs device with the OF
> > tree device node, so that user space can use device-tree info such as
> > additional "location" or "label" (or whatever else we can come up with)
> > propreties to identify a given device, or get some attributes of use
> > about it, etc...
> >
> > Now, so far, we've done that in some subsystem in a fairly ad-hoc basis
> > using "devspec" properties. For example, PCI creates them if it can
> > correlate the probed device with a DT node. Some powerpc specific busses
> > do that too.
> >
> > However, i2c doesn't and it would be nice to have something more generic
> > since technically any device can have a corresponding device tree node.
> >
> > This patch adds an "of_node" symlink to devices that have a non-NULL
> > dev->of_node pointer, the patch is pretty trivial and seems to work just
> > fine for me.
> >
> > Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> Acked-by: Rob Herring <robh@...nel.org>

Thanks, I'll queue these up after 3.20-rc1 is out.

greg k-h
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