linux-kernel - Re: [PATCH 1/2] USB: dwc3: get extcon device by OF graph bindings

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Date:   Tue, 15 May 2018 10:26:44 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        "open list\:DESIGNWARE USB3 DRD IP DRIVER" 
        <linux-usb@...r.kernel.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "open list\:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Inki Dae <inki.dae@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 1/2] USB: dwc3: get extcon device by OF graph bindings

Andrzej Hajda <a.hajda@...sung.com> 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 <a.hajda@...sung.com>
> ---
> 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

-- 
balbi

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