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

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Message-ID: <CAJKOXPffEz9Qn1FsGhKKHZqPo79J5svAhNSSHrHwsLjjgWkbNA@mail.gmail.com>
Date:   Tue, 15 May 2018 09:31:59 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        "open list:DESIGNWARE USB3 DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        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>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-kernel@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 1/2] USB: dwc3: get extcon device by OF graph bindings

On Tue, May 15, 2018 at 9:26 AM, Felipe Balbi <balbi@...nel.org> wrote:
> 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:

The DTS patch will go through arm-soc tree, I'll take it. The DTS
patches are independent from drivers and shall not usually go through
regular trees.

Best regards,
Krzysztof