linux-kernel - Re: [PATCH v6 09/10] usb: roles: add USB Type-B GPIO connector driver

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Date:   Thu, 6 Jun 2019 10:53:51 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Li Jun <jun.li@....com>,
        "Badhri Jagan Sridharan" <badhri@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Min Guo <min.guo@...iatek.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Biju Das <biju.das@...renesas.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Yu Chen" <chenyu56@...wei.com>
Subject: Re: [PATCH v6 09/10] usb: roles: add USB Type-B GPIO connector
 driver

On Wed, 2019-06-05 at 11:45 +0300, Andy Shevchenko wrote:
> On Wed, May 29, 2019 at 10:44 AM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
> >
> > Due to the requirement of usb-connector.txt binding, the old way
> > using extcon to support USB Dual-Role switch is now deprecated
> > when use Type-B connector.
> > This patch introduces a driver of Type-B connector which typically
> > uses an input GPIO to detect USB ID pin, and try to replace the
> > function provided by extcon-usb-gpio driver
> 
> > +static SIMPLE_DEV_PM_OPS(usb_conn_pm_ops,
> > +                        usb_conn_suspend, usb_conn_resume);
> > +
> > +#define DEV_PMS_OPS (IS_ENABLED(CONFIG_PM_SLEEP) ? &usb_conn_pm_ops : NULL)
> 
> Why this macro is needed?
Want to set .pm as NULL when CONFIG_PM_SLEEP is not enabled.

Thanks
>