linux-kernel - Re: [PATCH v4 8/9] dt-bindings: usb: generic: Add role-switch-default-host binding

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Message-ID: <CALAqxLUcvJ6K-ysOLJj0ddiGyoHGkaJBBiw6RShmWRD8h+wWrQ@mail.gmail.com>
Date:   Tue, 29 Oct 2019 11:26:01 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        ShuFan Lee <shufan_lee@...htek.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Yu Chen <chenyu56@...wei.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jun Li <lijun.kernel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Jack Pham <jackp@...eaurora.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 8/9] dt-bindings: usb: generic: Add role-switch-default-host
 binding

On Tue, Oct 29, 2019 at 2:23 AM Felipe Balbi <balbi@...nel.org> wrote:
> John Stultz <john.stultz@...aro.org> writes:
>
> > Add binding to configure the default role the controller
> > assumes is host mode when the usb role is USB_ROLE_NONE.
> >
...
> > + - role-switch-default-host: boolean, indicating if usb-role-switch is enabled
> > +                     the device default operation mode of controller while
> > +                     usb role is USB_ROLE_NONE is host mode. If this is not
> > +                     set or false, it will be assumed the default is device
> > +                     mode.
>
> Do we also need a role-switch-default-peripheral? Would it be better to
> have a single role-switch-default property which accepts "host" or
> "peripheral" arguments?

I guess the standard default is peripheral, so this differentiated
from that, but I agree it might be more forward thinking to let it
specify a type argument in case there is another option in the future.

I'll rework this.

Thanks again for the review and feedback!
-john