OPAL_GET_DEVICE_TREE

#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
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