Re: [PATCH 2/2 v3] drivers/core/of: Add symlink to device-tree from devices with an OF node
From: Greg Kroah-Hartman
Date: Tue Feb 17 2015 - 23:57:17 EST
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@xxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxx>
> Acked-by: Rob Herring <robh@xxxxxxxxxx>
Thanks, I'll queue these up after 3.20-rc1 is out.
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