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SubjectRe: [PATCH 1/2] USB: dwc3: get extcon device by OF graph bindings
Andrzej Hajda <> writes:

> extcon device is used to detect host/device connection. Since extcon
> OF property is deprecated, alternative method should be added.
> This method uses OF graph bindings to locate extcon.
> Signed-off-by: Andrzej Hajda <>
> ---
> Hi all,
> This patch implements alternative method to get extcon from DWC3.
> The code works but is hacky, as DWC3 must traverse different DT nodes
> to get extcon, in case of TM2 it is USB-PHY and MUIC, but other
> platforms can have different paths.
> I would be glad if it can be merged as is for now, but additional work
> must be done to make it generic.
> I guess on DT binding side it is OK. So the problem should be addressed
> in the code.
> My rough idea is to implement kind of extcon aliases/forwarder mechanism,
> ie. USB-PHY will expect on its output remote port extcon, and it should register
> extcon-forwarder pointing to this extcon. This way DWC3 can look for the extcon
> on its PHY phandle, and it will receive via forwarding mechanism extcon
> exposed by MUIC.
> As I said this is rough idea for discussion, other propositions are welcome.
> Regards
> Andrzej

I need someone from devicetree to review and ack patch2 before I can
apply them. Either way, this doesn't apply:

checking file drivers/usb/dwc3/drd.c
Hunk #1 FAILED at 8.
Hunk #2 FAILED at 38.
2 out of 2 hunks FAILED

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