linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: Use consistent naming for dwc3 usb nodes for sm8150

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Date:   Sat, 26 Jun 2021 23:56:02 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, bhupesh.linux@...il.com,
        balbi@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH 1/2] arm64: dts: qcom: Use consistent naming for dwc3 usb
 nodes for sm8150

Hi Bjorn,

On Sat, 26 Jun 2021 at 04:05, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Fri 25 Jun 17:03 CDT 2021, Bhupesh Sharma wrote:
>
> > The dwc3 usb nodes in sm8150.dtsi are currently named differently,
> > leading to some confusion when one sees the entries in sysfs or
> > dmesg:
> > [    1.943482] dwc3 a600000.usb: Adding to iommu group 1
> > [    2.266127] dwc3 a800000.dwc3: Adding to iommu group 2
> >
> > Name both the nodes as dwc3@<addr> for consistency.
> >
> > While at it also arrange the two usb controller, hs-phy and
> > ss-phy nodes closer in the dts for better readability.
> >
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sm8150.dtsi | 30 ++++++++++++++--------------
> >  1 file changed, 15 insertions(+), 15 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > index 612dda0fef43..3be6d093a99b 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > @@ -2205,6 +2205,20 @@ glink-edge {
> >                       };
> >               };
> >
> > +             dc_noc: interconnect@...0000 {
> > +                     compatible = "qcom,sm8150-dc-noc";
> > +                     reg = <0 0x09160000 0 0x3200>;
> > +                     #interconnect-cells = <1>;
> > +                     qcom,bcm-voters = <&apps_bcm_voter>;
> > +             };
> > +
> > +             gem_noc: interconnect@...0000 {
> > +                     compatible = "qcom,sm8150-gem-noc";
> > +                     reg = <0 0x09680000 0 0x3e200>;
> > +                     #interconnect-cells = <1>;
> > +                     qcom,bcm-voters = <&apps_bcm_voter>;
> > +             };
> > +
> >               usb_1_hsphy: phy@...2000 {
> >                       compatible = "qcom,sm8150-usb-hs-phy",
> >                                    "qcom,usb-snps-hs-7nm-phy";
> > @@ -2266,20 +2280,6 @@ usb_1_ssphy: lanes@...9200 {
> >                       };
> >               };
> >
> > -             dc_noc: interconnect@...0000 {
> > -                     compatible = "qcom,sm8150-dc-noc";
> > -                     reg = <0 0x09160000 0 0x3200>;
> > -                     #interconnect-cells = <1>;
> > -                     qcom,bcm-voters = <&apps_bcm_voter>;
> > -             };
> > -
> > -             gem_noc: interconnect@...0000 {
> > -                     compatible = "qcom,sm8150-gem-noc";
> > -                     reg = <0 0x09680000 0 0x3e200>;
> > -                     #interconnect-cells = <1>;
> > -                     qcom,bcm-voters = <&apps_bcm_voter>;
> > -             };
> > -
> >               usb_2_qmpphy: phy@...b000 {
> >                       compatible = "qcom,sm8150-qmp-usb3-uni-phy";
> >                       reg = <0 0x088eb000 0 0x200>;
> > @@ -2344,7 +2344,7 @@ usb_1: usb@...8800 {
> >
> >                       resets = <&gcc GCC_USB30_PRIM_BCR>;
> >
> > -                     usb_1_dwc3: usb@...0000 {
> > +                     usb_1_dwc3: dwc3@...0000 {
>
> "usb@" is actually the right one, per the rather recent standardization
> across the dwc3 bindings.

Ok, yes that makes more sense.
Although a grep for the keyword 'dwc3@', does lead up to quite a few
qcom dts files which use 'dwc3@ 'instead of 'usb@', which seem
inconsistent as per the bindings doc (see [1]).

Maybe I can fix those in v2 as well.

[1]. Documentation/devicetree/bindings/usb/qcom,dwc3.yaml

Thanks,
Bhupesh
>
> >                               compatible = "snps,dwc3";
> >                               reg = <0 0x0a600000 0 0xcd00>;
> >                               interrupts = <GIC_SPI 133 IRQ_TYPE_LEVEL_HIGH>;
> > --
> > 2.31.1
> >