Documentation: DT bindings: add doc for Altera's SoCFPGA platform

Document "altr,socfpga-cyclone5", "altr,socfpga-arria5", and
"altr,socfpga-arria10".

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/altera.txt b/Documentation/devicetree/bindings/arm/altera.txt
new file mode 100644
index 000000000000..558735aacca8
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/altera.txt
@@ -0,0 +1,14 @@
+Altera's SoCFPGA platform device tree bindings
+---------------------------------------------
+
+Boards with Cyclone 5 SoC:
+Required root node properties:
+compatible = "altr,socfpga-cyclone5", "altr,socfpga";
+
+Boards with Arria 5 SoC:
+Required root node properties:
+compatible = "altr,socfpga-arria5", "altr,socfpga";
+
+Boards with Arria 10 SoC:
+Required root node properties:
+compatible = "altr,socfpga-arria10", "altr,socfpga";