[RFC PATCH] dt:numa: adding numa node mapping for memory nodes.

[Ganapatrao Kulkarni]

From: Ganapatrao Kulkarni <ganapatrao.kulkarni at cavium.com>

This patch adds property "nid" to memory node to provide the memory range to
numa node id mapping.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni at cavium.com>

---
 Documentation/devicetree/bindings/numa.txt | 58 ++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/numa.txt

diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
new file mode 100644
index 0000000..c4a94f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/numa.txt
@@ -0,0 +1,58 @@
+======================================================
+numa id binding description
+======================================================
+
+======================================================
+1 - Introduction
+======================================================
+The device node  property "nid(numa node id)" can be added to memory
+device node to map the range of memory addresses as defined in property "reg".
+The property "nid" maps the memory range to the numa node id, which is used to
+find the local and remory pages on numa aware systems.
+
+======================================================
+2 - nid property
+======================================================
+Numa node id, "nid" is required property of memory device node for 
+numa enabled platforms.
+
+|------------------------------------------------------|
+|Property Type  | Usage | Value Type | Definition      |
+|------------------------------------------------------|
+|  nid          |  R    |    <u32>   | Numa Node id    |
+|               |       |            | for this memory |
+|------------------------------------------------------|
+
+========================================================
+4 - Example memory nodes with numa node id mapping
+========================================================
+
+Example 1 (2 memory nodes, each mapped to a numa node.):
+
+	memory at 00000000 {
+		device_type = "memory";
+		reg = <0x0 0x00000000 0x0 0x80000000>;
+		nid = <0x0>;
+	};
+
+	memory at 10000000000 {
+		device_type = "memory";
+		reg = <0x100 0x00000000 0x0 0x80000000>;
+		nid = <0x1>;
+	};
+
+Example 2 (multiple memory ranges in each memory node and mapped to numa node):
+
+	memory at 00000000 {
+		device_type = "memory";
+		reg = <0x0 0x00000000 0x0 0x80000000>,
+		      <0x0 0x80000000 0x0 0x80000000>;
+		nid = <0x0>;
+	};
+
+	memory at 10000000000 {
+		device_type = "memory";
+		reg = <0x100 0x00000000 0x0 0x80000000>,
+		      <0x100 0x80000000 0x0 0x80000000>;
+		nid = <0x1>;
+	};
-- 
1.8.1.4