usb: chipidea: udc: add maximum-speed = full-speed option

This patch makes it possible to set the chipidea udc into full-speed only mode.
It is set by the oftree property "maximum-speed = full-speed".

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index 8d58c8ce91ca..881901a59604 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
@@ -30,6 +30,7 @@ at imx6 SoC series
 - osc-clkgate-delay: the delay between powering up the xtal 24MHz clock
   and release the clock to the digital logic inside the analog block,
   0 <= osc-clkgate-delay <= 7.
+- maximum-speed: limit the maximum connection speed to "full-speed".
 
 Examples:
 usb@02184000 { /* USB OTG */
@@ -46,4 +47,5 @@ usb@02184000 { /* USB OTG */
         pinctrl-0 = <&pinctrl_usbh2_1>;
         pinctrl-1 = <&pinctrl_usbh2_2>;
         osc-clkgate-delay = <0x3>;
+        maximum-speed = "full-speed";
 };