linux-kernel - Re: [PATCH 3/3] ARM: dts: colibri-imx7: add usb dual-role switch capability

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Date:   Mon, 13 Jul 2020 18:52:20 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Philippe Schenker <philippe.schenker@...adex.com>,
        devicetree@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] ARM: dts: colibri-imx7: add usb dual-role switch
 capability

On Mon, Jul 13, 2020 at 11:46:04AM +0200, Ahmad Fatoum wrote:
> Hello Philippe,
> 
> On 7/10/20 3:24 PM, Philippe Schenker wrote:
> > Since the runtime-pm wakeup bug was fixed in
> > drivers/usb/chipidea/core.c usb dual-role host/device switching is
> > working. So make use of it.
> > 
> > Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> > 
> > ---
> > 
> >  arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi | 9 +++++++++
> >  arch/arm/boot/dts/imx7-colibri.dtsi         | 4 ++--
> >  2 files changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi b/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > index 97601375f264..db56a532a34a 100644
> > --- a/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > +++ b/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > @@ -20,6 +20,14 @@ clk16m: clk16m {
> >  		clock-frequency = <16000000>;
> >  	};
> >  
> > +	extcon_usbc_det: usbc_det {
> > +		compatible = "linux,extcon-usb-gpio";
> 
> According to 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver"):
> "the old way using extcon to support USB Dual-Role switch is now deprecated
>  when use Type-B connector."
> 
> Have you considered using a compatible = "gpio-usb-b-connector" child node instead?

I dropped patch #2 and #3 for now.

Shawn