ARM: dts: Add device tree bindings for dwc3-exynos

Document device tree binding information as required by the
Samsung' USB 3.0 controller.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt b/Documentation/devicetree/bindings/usb/exynos-usb.txt
index b3abde7..d967ba1 100644 (file)
--- a/Documentation/devicetree/bindings/usb/exynos-usb.txt
+++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt
@@ -48,3 +48,37 @@ Example:
                clocks = <&clock 285>;
                clock-names = "usbhost";
        };
+
+DWC3
+Required properties:
+ - compatible: should be "samsung,exynos5250-dwusb3" for USB 3.0 DWC3
+              controller.
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+                                with 'reg' property.
+ - ranges: allows valid 1:1 translation between child's address space and
+          parent's address space
+ - clocks: Clock IDs array as required by the controller.
+ - clock-names: names of clocks correseponding to IDs in the clock property
+
+Sub-nodes:
+The dwc3 core should be added as subnode to Exynos dwc3 glue.
+- dwc3 :
+   The binding details of dwc3 can be found in:
+   Documentation/devicetree/bindings/usb/dwc3.txt
+
+Example:
+       usb@12000000 {
+               compatible = "samsung,exynos5250-dwusb3";
+               clocks = <&clock 286>;
+               clock-names = "usbdrd30";
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               dwc3 {
+                       compatible = "synopsys,dwc3";
+                       reg = <0x12000000 0x10000>;
+                       interrupts = <0 72 0>;
+                       usb-phy = <&usb2_phy &usb3_phy>;
+               };
+       };