linux-kernel - RE: [PATCH resend] usb: chipidea: Don't select EXTCON

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Date:   Wed, 25 Apr 2018 01:47:42 +0000
From:   Peter Chen <peter.chen@....com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        "yossim@...eaurora.org" <yossim@...eaurora.org>,
        Stephen Boyd <sboyd@...eaurora.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH resend] usb: chipidea: Don't select EXTCON

 
> > >
> > > The patch doesn't remove extcon support from chipidea driver.
> > > I just want to not select EXTCON unconditionally, but let the users
> > > choose. If the users need extcon, they could enable EXTCON
> > > themselves
> > >
> > > I just searched all the dts in arch/arm/boot/dts and
> > > arch/arm64/boot/dts only the four dts give extcon phandle to chipidea host, other
> users don't make use of it:
> > >
> > > arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> > >
> > > arch/arm/boot/dts/qcom-apq8074-dragonboard.dts
> > >
> > > arch/arm/boot/dts/qcom-msm8974-fairphone-fp2.dts
> > >
> > > arch/arm/boot/dts/qcom-msm8974-sony-xperia-castor.dts
> > >
> >
> > I see, but I do not want to break msm platforms. You may try to create
> > Glue driver Kconfig entry for chipidea like dwc3, and let msm depends on EXTCON.
> 
> Got your points. Since multi_v7_defconfig has selected EXTCON, and
> EXTCON_USB_GPIO(which depends on EXTCON) is enabled in arm64 defconfig,
> so what about:
> 
> enable EXTCON explicitly in arm64 defconfig?
> then add this patch?
> 

I am not sure if Qualcomm platforms use these, add Qualcomm guys to confirm it.

Peter