linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8550: Add missing interconnect path to USB HC

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Message-ID: <ZHh3pyQprqKDn+TS@linaro.org>
Date:   Thu, 1 Jun 2023 13:49:11 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sm8550: Add missing interconnect path
 to USB HC

On 23-06-01 12:42:22, Konrad Dybcio wrote:
> 
> 
> On 1.06.2023 12:38, Abel Vesa wrote:
> > The USB HC node is missing the interconnect paths, so add them.
> > 
> > Fixes: 7f7e5c1b037f ("arm64: dts: qcom: sm8550: Add USB PHYs and controller nodes")
> For context, it's a fix in the context of "we should prooobably have
> this if we want to fix the icc driver to include sync state".

Fair enough...

> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> 
> 
> 
> sidenote:
> 
> on recent SoCs there's also an USB-IPA path:
> 
> aggre1_noc MASTER_USB3_0 <-> &config_noc SLAVE_IPA_CFG

AFAIK, support for IPA on SM8550 is not added yet.

We can worry about this 3rd path when IPA support for this platform is
upstreamed.

> 
> I don't think we really make use of that upstream today or whether it
> would make enabling IPA necessary (to enable the clocks and reach the
> IPA hardware), but it's something to think about.
> 
> Konrad
> >  arch/arm64/boot/dts/qcom/sm8550.dtsi | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> > index 75cd374943eb..4991b2e962d1 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> > @@ -2793,6 +2793,10 @@ usb_1: usb@...8800 {
> >  
> >  			resets = <&gcc GCC_USB30_PRIM_BCR>;
> >  
> > +			interconnects = <&aggre1_noc MASTER_USB3_0 0 &mc_virt SLAVE_EBI1 0>,
> > +					<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_USB3_0 0>;
> > +			interconnect-names = "usb-ddr", "apps-usb";
> > +
> >  			status = "disabled";
> >  
> >  			usb_1_dwc3: usb@...0000 {