Add binding details regarding nvidia,usb3-port-fake

Signed-off-by: Nagarjuna Kristam <nkris...@nvidia.com>
---
 Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git 
a/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt 
b/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
index 3742c15..21a5541 100644
--- a/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
+++ b/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
@@ -158,6 +158,9 @@ Optional properties:
   is internal. In the absence of this property the port is considered to be
   external.
 - vbus-supply: phandle to a regulator supplying the VBUS voltage.
+- nvidia,usb3-port-fake: A integer property whose presense informs that a
+  fake USB3 port needs to be mapped for corresponding USB2 port. This entry
+  is applicable only for Tegra210 based platforms which has USB2 only ports.
 
 ULPI ports:
 -----------
-- 
2.7.4

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