linux-kernel - Re: [PATCH] arm64: dts: imx8mp-evk: add dual-role usb port1 support

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Message-ID: <20230503153824.57clwmz7lw5g4aif@pengutronix.de>
Date:   Wed, 3 May 2023 17:38:24 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andreas Henriksson <andreas@...al.se>, Jun Li <jun.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        dl-linux-imx <linux-imx@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Xu Yang <xu.yang_2@....com>
Subject: Re: [PATCH] arm64: dts: imx8mp-evk: add dual-role usb port1 support

Hi Andreas, Shawn,

On 23-04-05, Shawn Guo wrote:
> On Mon, Apr 03, 2023 at 11:38:12AM +0200, Andreas Henriksson wrote:
> > Hello Marco Felsch,
> > 
> > On Thu, Mar 30, 2023 at 04:38:13PM +0200, Marco Felsch wrote:
> > > Hi,
> > > 
> > > On 23-03-27, Andreas Henriksson wrote:
> > [...]
> > > > / {
> > > >     gpio-sbu-mux {
> > > >         compatible = "gpio-sbu-mux";
> > [...]
> > > I didn't tested it but at the moment I don't see the problem with my
> > > patch. 
> > 
> > As Jun Li helpfully explained my patch is not correct, so don't bother.
> > 
> > I don't have a problem with your patch, was just trying to share
> > what I had done.

Thanks for sharing :)

> > I've since learned that the board I'll be working on will not even have
> > SS, so I will not pursue SBU. I'll most likely use your patches instead
> > as they seem simpler than what I did and should fully meet my needs for
> > an usb port that works in both host and device mode.
> > 
> > Not that it matters, but +1 from me on applying your patches.
> > (If people are hesitant to do it because of lack of SS, then maybe
> > that could be adressed by adding a comment setting the expectations?)
> 
> Marco,
> 
> Could you update the patch to mention a bit about Super-Speed support
> as discussed here?

Yes I will update the patch accordingly.

Regards,
  Marco