linux-kernel - Re: [PATCH v3 3/4] arm64: dts: qcom: Add PURWA-IOT-SOM platform

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Message-ID: <7050d5e6-ddcc-4ccf-99b6-0888318c5d7f@oss.qualcomm.com>
Date: Tue, 13 Jan 2026 12:29:43 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        YijieYang <yijie.yang@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....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
Subject: Re: [PATCH v3 3/4] arm64: dts: qcom: Add PURWA-IOT-SOM platform

On 1/13/26 11:47 AM, Dmitry Baryshkov wrote:
> On Tue, Jan 13, 2026 at 06:28:15PM +0800, YijieYang wrote:
>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>
>> The PURWA-IOT-SOM is a compact computing module that integrates a System
>> on Chip (SoC) — specifically the x1p42100 — along with essential
>> components optimized for IoT applications. It is designed to be mounted on
>> carrier boards, enabling the development of complete embedded systems.
>>
>> Make the following peripherals on the SOM enabled:
>> - Regulators on the SOM
>> - Reserved memory regions
>> - PCIe3, PCIe4, PCIe5, PCIe6a
>> - USB0 through USB6 and their PHYs
>> - ADSP, CDSP
>> - Graphic
>>
>> Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
>> ---
>>  .../qcom/{hamoa-iot-som.dtsi => purwa-iot-som.dtsi}   | 11 +++++------
>>  1 file changed, 5 insertions(+), 6 deletions(-)
>>  copy arch/arm64/boot/dts/qcom/{hamoa-iot-som.dtsi => purwa-iot-som.dtsi} (99%)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi b/arch/arm64/boot/dts/qcom/purwa-iot-som.dtsi
>> similarity index 99%
>> copy from arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi
>> copy to arch/arm64/boot/dts/qcom/purwa-iot-som.dtsi
>> index b8e3e04a6fbd..fb90beb1096f 100644
>> --- a/arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/purwa-iot-som.dtsi
>> @@ -3,11 +3,14 @@
>>   * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
>>   */
>>  
>> -#include "hamoa.dtsi"
>> +#include "purwa.dtsi"
>>  #include "hamoa-pmics.dtsi"
>>  #include <dt-bindings/gpio/gpio.h>
>>  #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
>>  
>> +/delete-node/ &pmc8380_6;
>> +/delete-node/ &pmc8380_6_thermal;
>> +
>>  / {
>>  	reserved-memory {
>>  		linux,cma {
>> @@ -378,16 +381,12 @@ vreg_l3j_0p8: ldo3 {
>>  	};
>>  };
>>  
>> -&iris {
>> -	status = "okay";
>> -};
> 
> Why?

Purwa has a slightly different Iris hw version (8.1.2 on Hamoa, 8.1.11 on Purwa)
which I would assume is slighly weaker, plus there's probably a freqtbl change

Let's take this as-is and enable it later

+Vikash, Dikshita this seems like a really low-hanging fruit, could you take
a look at Purwa support in Iris?

Konrad