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doc: usb: ci-hdrc-usb2: Add property "mux-controls"

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The chipidea usb controller may be connected, in some platforms,
to an external mux to toggle between different usb ports for
different roles (host and device).

The mux-controller property, if set, binds the chipidea usb
controller with a mux for this use.

Signed-off-by: Yossi Mansharoff <yossim@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yossi Mansharoff 2018-04-17 16:53:25 +03:00 committed by Greg Kroah-Hartman
parent 6e01827ed9
commit 7eced58dbf
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
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@ -76,6 +76,10 @@ Optional properties:
needs to make sure it does not send more than 90%
maximum_periodic_data_per_frame. The use case is multiple transactions, but
less frame rate.
- mux-controls: The mux control for toggling host/device output of this
controller. It's expected that a mux state of 0 indicates device mode and a
mux state of 1 indicates host mode.
- mux-control-names: Shall be "usb_switch" if mux-controls is specified.
i.mx specific properties
- fsl,usbmisc: phandler of non-core register device, with one
@ -102,4 +106,6 @@ Example:
rx-burst-size-dword = <0x10>;
extcon = <0>, <&usb_id>;
phy-clkgate-delay-us = <400>;
mux-controls = <&usb_switch>;
mux-control-names = "usb_switch";
};