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

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Date:   Mon, 3 Apr 2023 11:38:12 +0200
From:   Andreas Henriksson <andreas@...al.se>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Jun Li <jun.li@....com>, "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.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

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.

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?)

> Sure the ID pin is not connected but if I understood it correctly
> (please correct me) the tcpc will handle the orientation. I can set the
> mode to device from user-space which worked. I didn't verified the
> SuperSpeed mode nor the host mode since I don't have a USB-C flash
> drive.
> 
> Without the patch the port is just unused albeit the port is really
> useful for bootloaders like barebox to provide a usbgadget/fastboot
> device to flash the system.
> 
> Regards,
>   Marco

Regards,
Andreas Henriksson