Patch for Cross-Reference Phandles

Marius Strobl marius at
Sat Sep 14 13:32:04 UTC 2013

On Thu, Sep 12, 2013 at 10:07:18AM -0500, Nathan Whitehorn wrote:
> On 09/08/13 13:54, Nathan Whitehorn wrote:
> > Open Firmware has three namespaces for handles:
> > 1. Instance handles, for open devices
> > 2. Package handles for the client interface
> > 3. Package handles for device tree cross references
> >
> > On Powermac hardware, we assume that (2) and (3) are identical and 
> > call both phandles. On embedded FDT systems, you can't open devices 
> > and so we abuse ihandle_t for (3). IBM pSeries hardware, however, has 
> > all three things. With that in mind, I'd like to start separating 
> > them. The patch at 
> > adds a new 
> > function (OF_child_xref_phandle) that takes a phandle of type (3) and 
> > turns into one of type (2) by searching for entries named "phandle", 
> > "ibm,phandle", or "linux,phandle" in the tree. This should work for 
> > FDT as well, but is not connected in the patch to anything actually 
> > FDT related.
> >
> > Comments would be appreciated. I'd like to get to get this as in as 
> > soon as possible (given the HEAD freeze) otherwise.
> > -Nathan
> Since I haven't heard anything, it shouldn't affect any existing 
> platforms or code, and it would be nice to have this interface available 
> in the 10.x series, I plan to ask re@ for commit approval tomorrow. 
> Please let me know if there are any objections.

Technically that patch is fine. It would be nice if you could fix the
style bugs before committing, though. In OF_child_xref_phandle(), the
variables should go above the comment and you don't need to initialize
the static global one in ofw_pcibus.c to zero explicitly. If you do
nevertheless, spaces should go before and after the '='.


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