Patch for Cross-Reference Phandles

Nathan Whitehorn nwhitehorn at
Thu Sep 12 15:07:22 UTC 2013

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.

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