linux-kernel - Re: [PATCH 29/29] arm64: dts: qcom: Harmonize DWC USB3 DT nodes name

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Message-ID: <YO773RXaezcLNREX@yoga>
Date:   Wed, 14 Jul 2021 09:59:41 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     John Stultz <john.stultz@...aro.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH 29/29] arm64: dts: qcom: Harmonize DWC USB3 DT nodes name

On Wed 14 Jul 07:48 CDT 2021, Serge Semin wrote:
[..]
> As Krzysztof said in
> https://lore.kernel.org/lkml/20201221210423.GA2504@kozik-lap/
> and Bjorn noted in his response to your email, the only way to solve
> the problem is to fix the user-land app so one would be able to deal
> with both old and new DT-nodes name.

How do you suggest this to be done? The userspace ABI in question is
used to bind a USB gadgets to the particular USB controller, using the
device name of the USB controller.

> Alternatively you can just
> replace the dts with older one, where the name still have
> the "dwc3"-prefix.
> 

This is exactly what Linus has mind when he tells us not to break
user space.

Regards,
Bjorn