Doc: usb: ci-hdrc-usb2: add itc-setting at binding doc

It is used to configure the ITC (in register USBCMD) value
for kinds of applications.

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 553e2fae3a76f5be43b6fa2bfc00b18756892b44..4159c8cf78e3cc6697ab91d86337a8463a55a6cf 100644 (file)
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -30,6 +30,8 @@ Optional properties:
   argument that indicate usb controller index
 - disable-over-current: (FSL only) disable over current detect
 - external-vbus-divider: (FSL only) enables off-chip resistor divider for Vbus
+- itc-setting: interrupt threshold control register control, the setting
+  should be aligned with ITC bits at register USBCMD.
 
 Example:
 
@@ -41,4 +43,5 @@ Example:
                phys = <&usb_phy0>;
                phy-names = "usb-phy";
                vbus-supply = <&reg_usb0_vbus>;
+               gadget-itc-setting = <0x4>; /* 4 micro-frames */
        };