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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>
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@ -28,8 +28,13 @@ Optional properties:
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parent's address space
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- extcon : external connector for vbus and idpin changes detection, needed
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when supports dual-role mode.
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it's considered valid for compatibility reasons, not allowed for
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new bindings, and use "usb-role-switch" property instead.
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- vbus-supply : reference to the VBUS regulator, needed when supports
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dual-role mode.
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it's considered valid for compatibility reasons, not allowed for
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new bindings, and put into a usb-connector node.
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see connector/usb-connector.txt.
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- pinctrl-names : a pinctrl state named "default" is optional, and need be
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defined if auto drd switch is enabled, that means the property dr_mode
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is set as "otg", and meanwhile the property "mediatek,enable-manual-drd"
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@ -39,6 +44,8 @@ Optional properties:
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- maximum-speed : valid arguments are "super-speed", "high-speed" and
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"full-speed"; refer to usb/generic.txt
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- usb-role-switch : use USB Role Switch to support dual-role switch, but
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not extcon; see usb/generic.txt.
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- enable-manual-drd : supports manual dual-role switch via debugfs; usually
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used when receptacle is TYPE-A and also wants to support dual-role
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mode.
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@ -61,6 +68,9 @@ The xhci should be added as subnode to mtu3 as shown in the following example
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if host mode is enabled. The DT binding details of xhci can be found in:
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Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
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The port would be added as subnode if use "usb-role-switch" property.
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see graph.txt
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Example:
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ssusb: usb@11271000 {
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compatible = "mediatek,mt8173-mtu3";
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