linux-kernel - Re: [RFC][PATCH 2/3] usb: roles: Add usb role switch notifier.

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Message-ID: <CALAqxLWHbhst5KXAGCswKVp7ztzFHxdb6nskfze+Jk+xWo2Ssw@mail.gmail.com>
Date:   Fri, 18 Oct 2019 11:39:06 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     lkml <linux-kernel@...r.kernel.org>, Yu Chen <chenyu56@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Felipe Balbi <balbi@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jun Li <lijun.kernel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/3] usb: roles: Add usb role switch notifier.

On Fri, Oct 18, 2019 at 1:06 AM Hans de Goede <hdegoede@...hat.com> wrote:
> On 18-10-2019 07:55, John Stultz wrote:
> > On Wed, Oct 16, 2019 at 12:27 AM Hans de Goede <hdegoede@...hat.com> wrote:
> >> Look at the tcpm_set_vbus implementation in drivers/usb/typec/tcpm/fusb302.c
> >> you need to do something similar in your Type-C controller driver and
> >> export the GPIO as as a gpio-controlled regulator and tie the regulator to
> >> the connector.
> >
> > Thanks for the suggestion, I really appreciate it! One more question
> > though, since I'm using the tcpci_rt1711h driver, which re-uses the
> > somewhat sparse tcpci.c implementation, would you recommend trying to
> > add generic regulator support to the tcpci code or trying to extend
> > the implementation somehow allow the tcpci_rt1711h driver replace just
> > the set_vbus function?
>
> I have the feeling that this is more of a question for Heikki.
>
> My first instinct is: if you are using tcpci can't you put all
> the hacks you need for the usb connection shared between hub
> and type-c in your firmware ?

I appreciate the suggestion, but I'm not aware of any USB firmware for
the board, nor do I think I have any such source.  :(

thanks
-john