dt: Add phandle fixup helpers

When there is a new device tree that needs to be added to
the main dt of the opal (ex, IMC catalog dtb loaded from
pnor partition), we need to check for the phandle values
in the new incoming device tree before attaching it.
Reason is that, incoming device tree could already have
phandle values initialized for its nodes. Now, if we attach
this new device tree to the main opal DT, we could
potentially hit phandle duplicate error (since the
phandles value usually start with 1).

To avoid this, a new helper function dt_adjust_subtree_phandle()
is added to scan the incoming device tree and update
node "phandle" accordingly based on the opal
"last_phandle" value.

Add to this, helper function also supports updates of
"properties" with in a node which may refer the
"phandle" value in the incoming device tree. Helper
function will also fix the "properties" field accordingly.

Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

0 files changed, 0 insertions, 0 deletions