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

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Message-ID: <016e9b47-35b4-2110-bbef-ddfd0abc6a8d@linaro.org>
Date:   Mon, 2 Jan 2023 22:24:31 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org
Cc:     quic_schowdhu@...cinc.com, agross@...nel.org, andersson@...nel.org,
        linux-kernel@...r.kernel.org, bhupesh.linux@...il.com,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sm6115: Add EUD dt node and dwc3
 connector


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@...cinc.com>
>> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
>> ---
>> - 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@linaro.org/
>> - 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@linaro.org/
>>
>>   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@...0000 {
>>   			#power-domain-cells = <1>;
>>   		};
>>   
>> +		eud: eud@...0000 {
>> +			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@...3000 {
>>   			compatible = "qcom,sm6115-qusb2-phy";
>>   			reg = <0x01613000 0x180>;
>> @@ -1064,6 +1095,12 @@ usb_dwc3: usb@...0000 {
>>   				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

> 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,
Bhupesh

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