spapr: Support ibm,dynamic-memory-v2 property

The new property ibm,dynamic-memory-v2 allows memory to be represented
in a more compact manner in device tree.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 19 insertions, 0 deletions

diff --git a/docs/specs/ppc-spapr-hotplug.txt b/docs/specs/ppc-spapr-hotplug.txt
index f57e2a0..cc78331 100644
--- a/docs/specs/ppc-spapr-hotplug.txt
+++ b/docs/specs/ppc-spapr-hotplug.txt
@@ -387,4 +387,23 @@ Each LMB list entry consists of the following elements:
 - A 32bit flags word. The bit at bit position 0x00000008 defines whether
   the LMB is assigned to the the partition as of boot time.
 
+ibm,dynamic-memory-v2
+
+This property describes the dynamically reconfigurable memory. This is
+an alternate and newer way to describe dyanamically reconfigurable memory.
+It is a property encoded array that has an integer N (the number of
+LMB set entries) followed by N LMB set entries. There is an LMB set entry
+for each sequential group of LMBs that share common attributes.
+
+Each LMB set entry consists of the following elements:
+
+- Number of sequential LMBs in the entry represented by a 32bit integer.
+- Logical address of the first LMB in the set encoded as a 64bit integer.
+- DRC index of the first LMB in the set.
+- Associativity list index that is used as an index into
+  ibm,associativity-lookup-arrays property described earlier. This
+  is used to retrieve the right associativity list to be used for all
+  the LMBs in this set.
+- A 32bit flags word that applies to all the LMBs in the set.
+
 [1] http://thread.gmane.org/gmane.linux.ports.ppc.embedded/75350/focus=106867