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OPAL_GET_DEVICE_TREE
====================
Get device sub-tree.
Parameters: ::
uint32_t phandle: root device node phandle of the device sub-tree
uint64_t buf: FDT blob buffer or NULL
uint64_t len: length of the FDT blob buffer
Calling:
Retrieve device sub-tree. The root node's phandle is identified by @phandle.
The typical use is for the kernel to update its device tree following a change
in hardware (e.g. PCI hotplug).
Return Codes:
FDT blob size
returned FDT blob buffer size when ``buf`` is NULL
OPAL_SUCCESS
FDT blob is created successfully
OPAL_PARAMETER
invalid argument @phandle or @len
OPAL_INTERNAL_ERROR
failure creating FDT blob when calculating its size
OPAL_NO_MEM
not enough room in buffer for device sub-tree
OPAL_EMPTY
failure creating FDT blob
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