linux-kernel - Re: [PATCH v2 4/6] usb: roles: add API to get usb_role

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Date:   Fri, 15 Mar 2019 17:32:59 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "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@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 4/6] usb: roles: add API to get usb_role_switch by
 node

Hi,
On Fri, 2019-03-15 at 11:26 +0200, Heikki Krogerus wrote:
> Hi Chunfeng,
> 
> On Fri, Mar 15, 2019 at 05:13:24PM +0800, Chunfeng Yun wrote:
> > I encounter a build error when CONFIG_USB_ROLE_SWITCH is not enabled,
> > 
> > drivers/usb/mtu3/mtu3_dr.o: In function `ssusb_role_sw_register':
> > ./drivers/usb/mtu3/mtu3_dr.c:460: undefined reference to
> > `usb_role_switch_register'
> > drivers/usb/mtu3/mtu3_dr.o: In function `ssusb_otg_switch_exit':
> > ./drivers/usb/mtu3/mtu3_dr.c:491: undefined reference to
> > `usb_role_switch_unregister'
> 
> So you need to add dependency on USB_ROLE_SWITCH, right?
Yes

> 
> --- a/drivers/usb/mtu3/Kconfig
> +++ b/drivers/usb/mtu3/Kconfig
> @@ -43,6 +43,7 @@ config USB_MTU3_DUAL_ROLE
>         bool "Dual Role mode"
>         depends on ((USB=y || USB=USB_MTU3) && (USB_GADGET=y || USB_GADGET=USB_MTU3))
>         depends on (EXTCON=y || EXTCON=USB_MTU3)
> +       depends on USB_ROLE_SWITCH
>         help
>           This is the default mode of working of MTU3 controller where
>           both host and gadget features are enabled.
> 
> > the following patch has fixed the issue, but seems not get into kernel,
> > [v3,08/12] usb: roles: Add usb role switch notifier.
> > https://patchwork.kernel.org/patch/10836525/
> 
> I don't understand how that fixes the problem? That patch will in any
> case be targeting v5.2. We are in the middle of merge window, so
> nothing is happening until v5.1-rc1 is tagged.
It provides some dummy inline functions when USB_ROLE_SWITCH is not
enabled, this will avoid build error

> 
> 
> thanks,
>