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

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Date:   Mon, 2 Jan 2023 22:40:16 +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 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@...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
> 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>;
>>>> +                    };
>>>> +                };
>>>>                };
>>>>            };
>>>>