Re: [PATCH] arm64: dts: qcom: sm6115: Add EUD dt node and dwc3 connector

[Bhupesh Sharma]

On 1/2/23 10:33 PM, Konrad Dybcio wrote:
> On 2.01.2023 17:54, Bhupesh Sharma wrote:
> > On 1/2/23 4:16 PM, Konrad Dybcio wrote:
> > > On 31.12.2022 14:19, Bhupesh Sharma wrote:
> > > > Add the Embedded USB Debugger(EUD) device tree node for
> > > > SM6115 / SM4250 SoC.
> > > >
> > > > The node contains EUD base register region and EUD mode
> > > > manager register regions along with the interrupt entry.
> > > >
> > > > Also add the typec connector node for EUD which is attached to
> > > > EUD node via port. EUD is also attached to DWC3 node via port.
> > > >
> > > > Cc: Souradeep Chowdhury <quic_schowdhu@xxxxxxxxxxx>
> > > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx>
> > > > ---
> > > > - This patch is based on my earlier sm6115 usb related changes, which can
> > > >     be seen here:
> > > >     https://lore.kernel.org/linux-arm-msm/20221215094532.589291-1-bhupesh.sharma@xxxxxxxxxx/
> > > > - This patch is also dependent on my sm6115 eud dt-binding and driver changes
> > > >     sent earlier, which can be seen here:
> > > >     https://lore.kernel.org/linux-arm-msm/20221231130743.3285664-1-bhupesh.sharma@xxxxxxxxxx/
> > > >
> > > >    arch/arm64/boot/dts/qcom/sm6115.dtsi | 37 ++++++++++++++++++++++++++++
> > > >    1 file changed, 37 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > > > index 030763187cc3f..c775f7fdb7015 100644
> > > > --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > > > +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > > > @@ -565,6 +565,37 @@ gcc: clock-controller@1400000 {
> > > >                #power-domain-cells = <1>;
> > > >            };
> > > >    +        eud: eud@1610000 {
> > > > +            compatible = "qcom,sm6115-eud","qcom,eud";
> > > Missing space between entries.
> > >
> > > > +            reg = <0x01610000 0x2000>,
> > > > +                  <0x01612000 0x1000>,
> > > > +                  <0x003e5018 0x4>;
> > > > +            interrupts = <GIC_SPI 189 IRQ_TYPE_LEVEL_HIGH>;
> > > > +            ports {
> > > Newline before ports {}.
> > >
> > > Not sure if debugging hardware should be enabled by default..
> > > > +                port@0 {
> > > > +                    eud_ep: endpoint {
> > > > +                        remote-endpoint = <&usb2_role_switch>;
> > > > +                    };
> > > > +                };
> > > Newline between subsequent nodes.
> > >
> > > > +                port@1 {
> > > > +                    eud_con: endpoint {
> > > > +                        remote-endpoint = <&con_eud>;
> > > > +                    };
> > > > +                };
> > > > +            };
> > > > +        };
> > > > +
> > > > +        eud_typec: connector {
> > > Non-MMIO nodes don't belong under /soc.
> > >
> > > > +            compatible = "usb-c-connector";
> > > Newline between properties and subnode.
> > >
> > >
> > > > +            ports {
> > > > +                port@0 {
> > > > +                    con_eud: endpoint {
> > > > +                        remote-endpoint = <&eud_con>;
> > > > +                    };
> > > > +                };
> > > > +            };
> > > > +        };
> > > > +
> > > >            usb_hsphy: phy@1613000 {
> > > >                compatible = "qcom,sm6115-qusb2-phy";
> > > >                reg = <0x01613000 0x180>;
> > > > @@ -1064,6 +1095,12 @@ usb_dwc3: usb@4e00000 {
> > > >                    snps,has-lpm-erratum;
> > > >                    snps,hird-threshold = /bits/ 8 <0x10>;
> > > >                    snps,usb3_lpm_capable;
> > > > +                usb-role-switch;
> > > Same here.
> >
> > For all the above points, the format is same as suggested in [1] and already used in existing dts [2].
> >
> > [1]. https://www.kernel.org/doc/Documentation/devicetree/bindings/soc/qcom/qcom%2Ceud.yaml
> > [2]. https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/sc7280.dtsi#L3587
> The fact that it's landed does not necessarily imply it's 100% correct..
> That one seems to have slipped through review and could use some fixing up.

Fair enough. I will send a v2 with fixes for existing yaml documentation 
and dts files.

> > > On a note, this commit + driver-side changes give me a:
> > >
> > > 1610000.eud     qcom_eud: failed to get role switch
> >
> > You need to set dr_mode = "otg", for 'usb_dwc3' to make the role switch work.
> Thanks, couldn't find that anywhere. This however kicks me into EDL,
> so that's one more reason to disable it by default.

Ok. BTW it works fine on my sm6115 based board, but I agree it can be 
left as disabled by default for now.

Thanks.
> > > > +                port {
> > > > +                    usb2_role_switch: endpoint {
> > > > +                        remote-endpoint = <&eud_ep>;
> > > > +                    };
> > > > +                };
> > > >                };
> > > >            };
> > > >