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dt-bindings: usb: mtu3: add properties about USB Role Switch 

Now the USB Role Switch is supported, so add properties about it,
and modify some description related.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1567070558-29417-5-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2019-08-29 17:22:31 +08:00 committed by Greg Kroah-Hartman
parent f651c73e71
commit 3ef8685f84
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
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@ -28,8 +28,13 @@ Optional properties:
parent's address space
- extcon : external connector for vbus and idpin changes detection, needed
when supports dual-role mode.
it's considered valid for compatibility reasons, not allowed for
new bindings, and use "usb-role-switch" property instead.
- vbus-supply : reference to the VBUS regulator, needed when supports
dual-role mode.
it's considered valid for compatibility reasons, not allowed for
new bindings, and put into a usb-connector node.
see connector/usb-connector.txt.
- pinctrl-names : a pinctrl state named "default" is optional, and need be
defined if auto drd switch is enabled, that means the property dr_mode
is set as "otg", and meanwhile the property "mediatek,enable-manual-drd"
@ -39,6 +44,8 @@ Optional properties:
- maximum-speed : valid arguments are "super-speed", "high-speed" and
"full-speed"; refer to usb/generic.txt
- usb-role-switch : use USB Role Switch to support dual-role switch, but
not extcon; see usb/generic.txt.
- enable-manual-drd : supports manual dual-role switch via debugfs; usually
used when receptacle is TYPE-A and also wants to support dual-role
mode.
@ -61,6 +68,9 @@ 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 port would be added as subnode if use "usb-role-switch" property.
see graph.txt
Example:
ssusb: usb@11271000 {
compatible = "mediatek,mt8173-mtu3";