[PATCH v3 4/5] dt-bindings: arm64 ARCH_THUNDER2 platform documentation

Add documentation for Cavium ThunderX2 CN99XX ARM64 processor family.
The the SoC will use the ID "cavium,thunder-99xx".

Signed-off-by: Jayachandran C <redacted>
---

All marketing material refers to the chip as CN99XX (like CN88XX before)
that is why I have used the wildcard-like 99xx here.

 Documentation/devicetree/bindings/arm/cavium-thunder2.txt | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/cavium-thunder2.txt

diff --git a/Documentation/devicetree/bindings/arm/cavium-thunder2.txt b/Documentation/devicetree/bindings/arm/cavium-thunder2.txt
new file mode 100644
index 0000000..82276a2
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/cavium-thunder2.txt

@@ -0,0 +1,5 @@
+Cavium Thunder2 Family device tree bindings
+-------------------------------------------
+
+Boards with Cavium ThunderX2 CN99XX shall have the root property:
+  compatible = "cavium,thunder-99xx";