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Date:   Tue, 22 Jan 2019 08:33:48 -0600
From:   Bin Liu <b-liu@ti.com>
To:     Min Guo <min.guo@mediatek.com>
CC:     Rob Herring <robh@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
        <devicetree@vger.kernel.org>, <hdegoede@redhat.com>,
        <tony@atomide.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        <chunfeng.yun@mediatek.com>, <linux-mediatek@lists.infradead.org>,
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek
 musb controller
Message-ID: <20190122143348.GF30080@uda0271908>
Mail-Followup-To: Bin Liu <b-liu@ti.com>, Min Guo <min.guo@mediatek.com>,
        Rob Herring <robh@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org, hdegoede@redhat.com, tony@atomide.com,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>, chunfeng.yun@mediatek.com,
        linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
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Hi Min,

On Tue, Jan 22, 2019 at 05:36:13PM +0800, Min Guo wrote:
> Hi Bin,
> 
> Sorry to bother you again, I encounter a problem about the extcon
> property.
> 
> I don't find a common driver describing the usb-connector. Is
> there any driver that I can refer to, specially the way to switch MUSB
> controller between host and device mode? 
> If it needs to implement by myself, is it possible to emulate an
> usb-connector driver by extcon-usb-gpio, and also use the notifier
> mechanism or can you give me some advices?

I am afraid I am unable to help you on this. I wasn't really pay
attention when usb-connector was introduced and not sure how it can
replace extcon. Now after read usb-connector.txt, it seems the binding
only defines a/b/c-connector, but not ab-connector, and there is no
enough information (at least for me) explaining how VBUS and ID fix into
this usb-connector binding.

Maybe Rob can provide some hint.

Regards,
-Bin.