linux-kernel - Re: [PATCH v4 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board

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Message-ID: <110b87e9-4f74-4a81-bc98-a1f965e03c66@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 14:47:05 +0800
From: Yijie Yang <yijie.yang@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board



On 1/19/2026 9:31 PM, Konrad Dybcio wrote:
> On 1/19/26 10:46 AM, Dmitry Baryshkov wrote:
>> On Mon, Jan 19, 2026 at 04:48:20PM +0800, Yijie Yang wrote:
>>>
>>>
>>> On 1/19/2026 2:33 PM, Dmitry Baryshkov wrote:
>>>> On Mon, Jan 19, 2026 at 11:13:29AM +0800, Yijie Yang wrote:
>>>>>
>>>>>
>>>>> On 1/17/2026 12:19 AM, Krzysztof Kozlowski wrote:
>>>>>> On 16/01/2026 11:41, YijieYang wrote:
>>>>>>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>>>>>>
>>>>>>> The PURWA-IOT-EVK is an evaluation platform for IoT products, composed of
>>>>>>> the Purwa IoT SoM and a carrier board. Together, they form a complete
>>>>>>> embedded system capable of booting to UART.
>>>>>>>
>>>>>>> PURWA-IOT-EVK uses the PS8833 as a retimer for USB0, unlike HAMOA-IOT-EVK.
>>>>>>> Meanwhile, USB0 bypasses the SBU selector FSUSB42.
>>>>>>>
>>>>>>
>>>>>> NAK.
>>>>>>
>>>>>> Warnings were reported at v3. Did you address them? No, you completely
>>>>>> ignored them, so warnings are reported again at v4.
>>>>>>
>>>>>> What do you think these emails are for?
>>>>>
>>>>> This warning is caused by the pcie3_phy node in purwa.dtsi, which is not
>>>>> introduced by this patch set. Since it does not impact functionality, would
>>>>> it be appropriate to fix it in a separate patch?
>>>>
>>>> Why can't it be fixed as a part of this patchset?
>>>
>>> 'qcom,4ln-config-sel' is a property related to bifurcated PHY support, which
>>> Purwa’s PCIe3 does not provide. Therefore, introducing a new compatible with
>>> a corresponding binding would be more appropriate than simply adding this
>>> property. Is it acceptable to address this within the current patch set?
>>
>> Within this or in the separate patchset, but it needs to be fixed before
>> this patch can go in. Otherwise we are enabling broken PCIe3.
> 
> https://lore.kernel.org/linux-arm-msm/20260119-topic-purwa_phy_shutup_warning-v1-1-997a692b31c6@oss.qualcomm.com/T/#u

Thanks, I can add this as a dependency.

> 
> Konrad

-- 
Best Regards,
Yijie