dt-bindings: nds32 CPU Bindings

This patch adds nds32 CPU binding documents.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Reviewed-by: Rob Herring <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/nds32/cpus.txt b/Documentation/devicetree/bindings/nds32/cpus.txt
new file mode 100644 (file)
index 0000000..6f9e311
--- /dev/null
+++ b/Documentation/devicetree/bindings/nds32/cpus.txt
@@ -0,0 +1,38 @@
+* Andestech Processor Binding
+
+This binding specifies what properties must be available in the device tree
+representation of a Andestech Processor Core, which is the root node in the
+tree.
+
+Required properties:
+
+       - compatible:
+               Usage: required
+               Value type: <string>
+               Definition: Should be "andestech,<core_name>", "andestech,nds32v3" as fallback.
+               Must contain "andestech,nds32v3" as the most generic value, in addition to
+               one of the following identifiers for a particular CPU core:
+               "andestech,n13"
+               "andestech,n15"
+               "andestech,d15"
+               "andestech,n10"
+               "andestech,d10"
+       - device_type
+               Usage: required
+               Value type: <string>
+               Definition: must be "cpu"
+       - reg: Contains CPU index.
+       - clock-frequency: Contains the clock frequency for CPU, in Hz.
+
+* Examples
+
+/ {
+       cpus {
+               cpu@0 {
+                       device_type = "cpu";
+                       compatible = "andestech,n13", "andestech,nds32v3";
+                       reg = <0x0>;
+                       clock-frequency = <60000000>
+               };
+       };
+};