linux-kernel - Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek musb controller

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Date:   Tue, 22 Jan 2019 08:33:48 -0600
From:   Bin Liu <b-liu@...com>
To:     Min Guo <min.guo@...iatek.com>
CC:     Rob Herring <robh@...nel.org>, Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <hdegoede@...hat.com>,
        <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        <chunfeng.yun@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek
 musb controller

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.