Adding Documentation for dt binding for memory to numa node mapping.
Signed-off-by: Ganapatrao Kulkarni <[email protected]>
---
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
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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@00000000 {
+ device_type = "memory";
+ reg = <0x0 0x00000000 0x0 0x80000000>;
+ nid = <0x0>;
+ };
+
+ memory@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@00000000 {
+ device_type = "memory";
+ reg = <0x0 0x00000000 0x0 0x80000000>,
+ <0x1 0x00000000 0x0 0x80000000>;
+ nid = <0x0>;
+ };
+
+ memory@10000000000 {
+ device_type = "memory";
+ reg = <0x100 0x00000000 0x0 0x80000000>;
+ reg = <0x100 0x80000000 0x0 0x80000000>;
+ nid = <0x1>;
+ };
--
1.8.1.4
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