linux-kernel - Re: [RFC/PATCH] usb: misc: Add a driver for TC7USB40MU

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Message-ID: <20160917002055.GA10392@b29397-desktop>
Date:   Sat, 17 Sep 2016 08:20:55 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Stephen Boyd <stephen.boyd@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, robh+dt@...nel.org,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        devicetree@...r.kernel.org
Subject: Re: [RFC/PATCH] usb: misc: Add a driver for TC7USB40MU

On Thu, Sep 15, 2016 at 06:16:38PM -0700, Stephen Boyd wrote:
> 
> > For #3, it is not the
> > use case for this design. #3 is usually used for the single port which
> > needs to support switching role on the fly without disconnection.
> > So, you may only need to consider #2, you can't use extcon-usb-gpio.c
> > directly since you need to set one gpio to mux the dp/dm, Baolu Lu had
> > USB MUX patch set before which may satisfy your requirement. [1]
> 
> Ok. Did the usb mux patches go anywhere? It seemed to get tangled up in
> DRD framework and I haven't been following along. I'll look into these
> patches more.

DRD framework is denied by Felipe due to only one user can be benefit
from it (chipidea OTG), I don't know the further status of USB MUX,
maybe you can ask for it.

-- 

Best Regards,
Peter Chen