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.. _OPAL_GET_DEVICE_TREE:
OPAL_GET_DEVICE_TREE
====================
.. code-block:: c
#define OPAL_GET_DEVICE_TREE 118
int64_t opal_get_device_tree(uint32_t phandle, uint64_t buf, uint64_t len);
Get device sub-tree.
``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
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
:ref:`OPAL_SUCCESS`
FDT blob is created successfully
:ref:`OPAL_PARAMETER`
invalid argument @phandle or @len
:ref:`OPAL_INTERNAL_ERROR`
failure creating FDT blob when calculating its size
:ref:`OPAL_NO_MEM`
not enough room in buffer for device sub-tree
:ref:`OPAL_EMPTY`
failure creating FDT blob
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