linux-kernel - Re: [PATCH v2 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board

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Message-ID: <36d3ead4-69c3-4bb5-b29f-25e9b7182618@oss.qualcomm.com>
Date: Mon, 12 Jan 2026 11:54:37 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Yijie Yang <yijie.yang@....qualcomm.com>
Cc: 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,
        krzysztof.kozlowski@....qualcomm.com
Subject: Re: [PATCH v2 4/4] arm64: dts: qcom: Add base PURWA-IOT-EVK board

On 1/12/26 7:01 AM, Dmitry Baryshkov wrote:
> On Mon, 12 Jan 2026 at 07:51, Yijie Yang <yijie.yang@....qualcomm.com> wrote:
>>
>>
>>
>> On 1/12/2026 1:00 PM, Dmitry Baryshkov wrote:
>>> On Mon, Jan 12, 2026 at 11:12:09AM +0800, Yijie Yang wrote:
>>>>
>>>>
>>>> On 1/9/2026 7:29 PM, Konrad Dybcio wrote:
>>>>> On 1/9/26 8:59 AM, 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.
>>>>>
>>>>> [...]
>>>>>
>>>>>> -  backlight: backlight {
>>>>>> -          compatible = "pwm-backlight";
>>>>>> -          pwms = <&pmk8550_pwm 0 5000000>;
>>>>>> -          enable-gpios = <&pmc8380_3_gpios 4 GPIO_ACTIVE_HIGH>;
>>>>>> -          power-supply = <&vreg_edp_bl>;
>>>>>> -
>>>>>> -          pinctrl-0 = <&edp_bl_en>, <&edp_bl_pwm>;
>>>>>> -          pinctrl-names = "default";
>>>>>> -  };
>>>>>
>>>>> Is the backlight infra different on the Purwa IoT EVK?
>>>>
>>>> As you can see, this Purwa file was copied from the latest
>>>> hamoa-iot-evk.dts. However, not all nodes have been verified on Purwa.
>>>> Therefore, I need to retain only the functions that work correctly and keep
>>>> them aligned with the nodes from my initial version. The deleted nodes will
>>>> be updated later by the respective authors from different technical areas.
>>>
>>> Please, only delete nodes which are not present on the Purwa IoT EVK.
>>
>> This isn’t a deletion—it’s just not ready yet. Why do we need to include
>> all the nodes like a mature Hamoa platform in the initial push?
> 
> Purwa seems to be mature enough. What exactly can't be enabled at this moment?

Right, I'm in the same camp. Since you already have the board at your
disposal (because I trust you tested this patchset on hardware), why
not spend the extra 5-10 minutes verifying that e.g. the display lights
up and you can control its brightness?

Konrad