Documentation: bindings: add doc for zynq USB

Document the binding for the zynq specific chipidea UDC binding.

Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index d71ef07bca5d1a3505ecab53f0b84bc8e5d12fc1..a057b75ba4b5f2d39b51f55c85b814b95f165820 100644 (file)
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -6,6 +6,7 @@ Required properties:
        "lsi,zevio-usb"
        "qcom,ci-hdrc"
        "chipidea,usb2"
+       "xlnx,zynq-usb-2.20a"
 - reg: base address and length of the registers
 - interrupts: interrupt for the USB controller