[RFC PATCH 2/4] arm/arm64:dt:numa: adding numa node mapping for memory nodes.

[Ganapatrao Kulkarni]

Adding Documentation for dt binding for memory to numa node mapping.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni at caviumnetworks.com>
---
 Documentation/devicetree/bindings/arm/numa.txt | 60 ++++++++++++++++++++++++++
 1 file changed, 60 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..1cdc6d3
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/numa.txt
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+========================================================
+ARM 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 remote pages on numa aware systems.
+
+========================================================
+2 - nid property
+========================================================
+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 information
+========================================================
+
+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>,
+		      <0x1 0x00000000 0x0 0x80000000>;
+		nid = <0x0>;
+	};
+
+	memory at 10000000000 {
+		device_type = "memory";
+		reg = <0x100 0x00000000 0x0 0x80000000>;
+		reg = <0x100 0x80000000 0x0 0x80000000>;
+		nid = <0x1>;
+	};
-- 
1.8.1.4