[RFC PATCH v2 2/4] Documentation: arm64/arm: dt bindings for numa.

DT bindings for numa map for memory, cores to node and
proximity distance matrix of nodes to each other.

Signed-off-by: Ganapatrao Kulkarni <redacted>
---
 Documentation/devicetree/bindings/arm/numa.txt | 103 +++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/numa.txt

diff --git a/Documentation/devicetree/bindings/arm/numa.txt b/Documentation/devicetree/bindings/arm/numa.txt
new file mode 100644
index 0000000..ec6bf2d
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/numa.txt

@@ -0,0 +1,103 @@
+==============================================================================
+NUMA binding description.
+==============================================================================
+
+==============================================================================
+1 - Introduction
+==============================================================================
+
+Systems employing a Non Uniform Memory Access (NUMA) architecture contain
+collections of hardware resources including processors, memory, and I/O buses,
+that comprise what is commonly known as a ??UMA node?? Processor
+accesses to memory within the local NUMA node is
+generally faster than processor accesses to memory outside of the local
+NUMA node. DT defines interfaces that allow the platform to convey NUMA node
+topology information to OS.
+
+==============================================================================
+2 - numa-map node
+==============================================================================
+
+DT Binding for NUMA can be defined for memory and CPUs to map them to
+respective NUMA nodes.
+
+The DT binding can defined using numa-map node.
+The numa-map will have following properties to define NUMA topology.
+
+- mem-map:	This property defines the association between a range of
+		memory and the proximity domain/numa node to which it belongs.
+
+note: memory range address is passed using either memory node of
+DT or UEFI system table and should match to the address defined in mem-map.
+
+- cpu-map:	This property defines the association of range of processors
+		(range of cpu ids) and the proximity domain to which
+		the processor belongs.
+
+- node-matrix:	This table provides a matrix that describes the relative
+		distance (memory latency) between all System Localities.
+		The value of each Entry[i j distance] in node-matrix table,
+		where i represents a row of a matrix and j represents a
+		column of a matrix, indicates the relative distances
+		from Proximity Domain/Numa node i to every other
+		node j in the system (including itself).
+
+The numa-map node must contain the appropriate #address-cells,
+#size-cells and #node-count properties.
+
+
+==============================================================================
+4 - Example dts
+==============================================================================
+
+Example 1: 2 Node system each having 8 CPUs and a Memory.
+
+	numa-map {
+		#address-cells = <2>;
+		#size-cells = <1>;
+		#node-count = <2>;
+		mem-map =  <0x0 0x00000000 0>,
+		           <0x100 0x00000000 1>;
+
+		cpu-map = <0 7 0>,
+			  <8 15 1>;