linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7280-herobrine: Don't enable the USB 2.0 port

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Date:   Fri, 26 Aug 2022 09:16:27 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7280-herobrine: Don't enable the USB
 2.0 port

 Hi,

On Fri, Aug 26, 2022 at 8:48 AM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> The USB 2.0 port of sc7280 is currently not used by any herobrine
> board. Delete the device tree entries that enable it.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> I was also told that the 2.0 port is for the Embedded USB Debugger
> (EUD) only, but I'm not sure if that's true. From the Linux side
> it looks like a regular dwc3 controller.
>
>  arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 12 ------------
>  1 file changed, 12 deletions(-)

I can confirm it's not hooked up anywhere on herobrine-class boards.
Disabling looks good to me. If we later have a herobrine variant where
this is enabled we can enable it just for that variant.

Reviewed-by: Douglas Anderson <dianders@...omium.org>