linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8250: add a link between DWC3 and QMP PHY

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Date: Fri, 22 Mar 2024 19:17:55 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...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@...r.kernel.org,
 Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8250: add a link between DWC3 and
 QMP PHY

On 22.03.2024 14:19, Dmitry Baryshkov wrote:
> On Fri, 22 Mar 2024 at 14:11, Bryan O'Donoghue
> <bryan.odonoghue@...aro.org> wrote:
>>
>> On 22/03/2024 11:58, Dmitry Baryshkov wrote:
>>> The SuperSpeed signals originate from the DWC3 host controller and then
>>> are routed through the Combo QMP PHY, where they are multiplexed with
>>> the DisplayPort signals. Add corresponding OF graph link.
>>>
>>> Reported-by: Luca Weiss <luca.weiss@...rphone.com>
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> ---
>>>   arch/arm64/boot/dts/qcom/sm8250.dtsi | 24 ++++++++++++++++++++++--
>>>   1 file changed, 22 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
>>> index d57039a4c3aa..e551e733ab94 100644
>>> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
>>> @@ -3917,6 +3917,10 @@ port@0 {
>>>
>>>                               port@1 {
>>>                                       reg = <1>;
>>> +
>>> +                                     usb_1_qmpphy_usb_ss_in: endpoint {
>>> +                                             remote-endpoint = <&usb_1_dwc3_ss_out>;
>>> +                                     };
>>>                               };
>>>
>>>                               port@2 {
>>> @@ -4195,8 +4199,24 @@ usb_1_dwc3: usb@...0000 {
>>>                               phys = <&usb_1_hsphy>, <&usb_1_qmpphy QMP_USB43DP_USB3_PHY>;
>>>                               phy-names = "usb2-phy", "usb3-phy";
>>>
>>> -                             port {
>>> -                                     usb_1_dwc3_hs_out: endpoint {};
>>> +                             ports {
>>> +                                     #address-cells = <1>;
>>> +                                     #size-cells = <0>;
>>> +
>>> +                                     port@0 {
>>> +                                             reg = <0>;
>>> +
>>> +                                             usb_1_dwc3_hs_out: endpoint {
>>> +                                             };
>>> +                                     };
>>> +
>>> +                                     port@1 {
>>> +                                             reg = <1>;
>>> +
>>> +                                             usb_1_dwc3_ss_out: endpoint {
>>> +                                                     remote-endpoint = <&usb_1_qmpphy_usb_ss_in>;
>>> +                                             };
>>> +                                     };
>>>                               };
>>>                       };
>>>               };
>>>
>>
>> I think these should go into platform definitions, there's nothing at
>> the SoC level that imposes the port constraint.
> 
> The link between DWC3 and QMP PHY is fixed in the SoC, if I remember correctly.

Yes, I believe so too

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>