Now the USB Role Switch is supported, so add properties about it

Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
 .../devicetree/bindings/usb/mediatek,mtu3.txt          | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt 
b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
index 3382b5cb471d..97239913a7bd 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
@@ -27,7 +27,9 @@ Optional properties:
  - ranges : allows valid 1:1 translation between child's address space and
        parent's address space
  - extcon : external connector for vbus and idpin changes detection, needed
-       when supports dual-role mode.
+       when supports dual-role mode; it's consiedered valid for compatibility
+       reasons, and not allowed for new bindings, use the property
+       usb-role-switch instead.
  - vbus-supply : reference to the VBUS regulator, needed when supports
        dual-role mode.
  - pinctrl-names : a pinctrl state named "default" is optional, and need be
@@ -36,7 +38,8 @@ Optional properties:
        is not set.
  - pinctrl-0 : pin control group
        See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-
+ - usb-role-switch : use USB Role Switch to support dual-role siwtch, but
+       not extcon
  - maximum-speed : valid arguments are "super-speed", "high-speed" and
        "full-speed"; refer to usb/generic.txt
  - enable-manual-drd : supports manual dual-role switch via debugfs; usually
@@ -61,6 +64,9 @@ The xhci should be added as subnode to mtu3 as shown in the 
following example
 if host mode is enabled. The DT binding details of xhci can be found in:
 Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
 
+The connector would be added as subnode if receptacle is Micro, see
+connector/usb-connector.txt
+
 Example:
 ssusb: usb@11271000 {
        compatible = "mediatek,mt8173-mtu3";
-- 
2.20.1

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