This patch adds device tree bindings documentation for Synopsys
USB device controller platform driver.

Signed-off-by: Raviteja Garimella <raviteja.garime...@broadcom.com>
---
 .../devicetree/bindings/usb/snps,dw-ahb-udc.txt    | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/snps,dw-ahb-udc.txt

diff --git a/Documentation/devicetree/bindings/usb/snps,dw-ahb-udc.txt 
b/Documentation/devicetree/bindings/usb/snps,dw-ahb-udc.txt
new file mode 100644
index 0000000..0c18327
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/snps,dw-ahb-udc.txt
@@ -0,0 +1,27 @@
+Synopsys USB Device controller.
+
+The device node is used for Synopsys Designware Cores AHB
+Subsystem Device Controller (UDC).
+
+This device node is used by UDCs integrated it Broadcom's
+Northstar2 and Cygnus SoC's.
+
+Required properties:
+ - compatible: should be "snps,dw-ahb-udc"
+ - reg: Offset and length of UDC register set
+ - interrupts: description of interrupt line
+ - phys: phandle to phy node.
+ - extcon: phandle to the extcon device. This is optional and
+   not required for those that don't require extcon support.
+   Extcon support will be required if the UDC is connected to
+   a Dual Role Device Phy that supports both Host and Device
+   mode based on the external cable.
+
+Example:
+       udc_dwc: usb@664e0000 {
+               compatible = "snps,dw-ahb-udc";
+               reg = <0x664e0000 0x2000>;
+               interrupts = <GIC_SPI 424 IRQ_TYPE_LEVEL_HIGH>;
+               phys = <&usbdrd_phy>;
+               extcon = <&usbdrd_phy>";
+       };
-- 
2.1.0

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