usb: chipidea: add imx platform driver

This patch supports only the host-mode functionality so far.

Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Peter Chen <peter.chen@freescale.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Felipe Balbi <balbi@ti.com>
Tested-by: Subodh Nijsure <snijsure@grid-net.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/ci13xxx-imx.txt

@@ -0,0 +1,18 @@
+* Freescale i.MX ci13xxx usb controllers
+
+Required properties:
+- compatible: Should be "fsl,imx27-usb"
+- reg: Should contain registers location and length
+- interrupts: Should contain controller interrupt
+
+Optional properties:
+- fsl,usbphy: phandler of usb phy that connects to the only one port
+- vbus-supply: regulator for vbus
+
+Examples:
+usb@02184000 { /* USB OTG */
+	compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
+	reg = <0x02184000 0x200>;
+	interrupts = <0 43 0x04>;
+	fsl,usbphy = <&usbphy1>;
+};