Message-ID: <e577c093-0851-48b8-abdb-0aee0479c1e3@oss.qualcomm.com>
Date: Wed, 4 Feb 2026 09:42:04 +0800
From: Yijie Yang <yijie.yang@....qualcomm.com>
To: Rob Herring <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
        andersson@...nel.org, krzk+dt@...nel.org, konradybcio@...nel.org,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, conor+dt@...nel.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v5 0/4] Initial patch set for PURWA-IOT-EVK



On 2/4/2026 1:37 AM, Rob Herring wrote:
> 
> On Mon, 02 Feb 2026 15:35:44 +0800, YijieYang wrote:
>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>
>> Introduce the device tree, DT bindings, and driver updates required to enable
>> the bring-up of the PURWA-IOT-EVK evaluation board. Focus is on two key
>> hardware components:
>>
>> PURWA-IOT-SOM — A compact System-on-Module integrating the SoC, GPIOs, and
>> PMICs. Designed for modularity, it can pair with various carrier boards to
>> support diverse use cases.
>>
>> PURWA-IOT-EVK — A carrier board tailored for IoT scenarios, providing
>> essential peripherals such as UART, on-board PMICs, and USB components.
>>
>> Together, these components form a flexible and scalable platform. Initial
>> functionality is achieved through proper device tree configuration and driver
>> support.
>>
>> The PURWA-IOT-EVK/SOM shares most of its hardware design with
>> HAMOA-IOT-EVK/SOM, differing primarily in the BOM. Consequently, the DTS files
>> are largely similar. Both platforms belong to Qualcomm’s IQ-X family. For more
>> details on the IQ-X series, see:
>> https://www.qualcomm.com/internet-of-things/products/iq-x-series
>>
>> Hardware differences between HAMOA-IOT and PURWA-IOT:
>> - Display — PURWA uses a different number of clocks and frequency compared to
>>    HAMOA.
>> - GPU — PURWA integrates a different GPU.
>> - USB0 — PURWA uses a PS8833 retimer, while HAMOA employs an FSUSB42 as the
>>    SBU switch.
>>
>> Features added and enabled:
>> - UART
>> - On-board regulators
>> - Regulators on the SOM
>> - PMIC GLINK
>> - USB0 through USB6 and their PHYs
>> - Embedded USB (eUSB) repeaters
>> - USB Type-C mux
>> - PCIe3, PCIe4, PCIe5, PCIe6a
>> - Reserved memory regions
>> - Pinctrl
>> - NVMe
>> - ADSP, CDSP
>> - WLAN, Bluetooth (M.2 interface)
>> - USB DisplayPort and eDP
>> - Graphics
>> - Audio
>> - TPM
>>
>> Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
>> ---
>> Changes in v2:
>> - Update the GPU firmware path.
>> - Update the description in the cover letter.
>> - Reorder the patches.
>> - Use separate DTS files for Purwa and Hamoa.
>> - Update base commit.
>> - Link to v1: https://lore.kernel.org/all/20251222-purwa-v1-0-14ab9316e5ff@oss.qualcomm.com/
>>
>> Changes in v3:
>> - Delete unused PMIC and thermal nodes.
>> - Add WiFi node.
>> - Add display backlight node.
>> - Add connectors and VBUS regulators for USB3 and USB6.
>> - Enable PCIe3 and PCIe5; add PCIe ports along with reset and wake-up GPIOs.
>> - Link to v2: https://lore.kernel.org/r/20260109-purwa-v2-0-f39ee10684cb@oss.qualcomm.com
>>
>> Changes in v4:
>> - Enable TPM.
>> - Update the descriptions for video and the USB OF graph.
>> - Link to v3: https://lore.kernel.org/all/20260113-purwa-v3-0-16eefacbdce9@oss.qualcomm.com/
>>
>> Changes in v5:
>> - Reorder nodes in purwa-iot-evk.dts.
>> - Update base commit.
>> - The DT binding change that fixes the DT warning for pcie3_phy is located at: https://lore.kernel.org/linux-arm-msm/20260119-topic-purwa_phy_shutup_warning-v1-1-997a692b31c6@oss.qualcomm.com/T/#u
>> - Link to v4: https://lore.kernel.org/r/20260116-purwa-v4-0-89b2adae9f09@oss.qualcomm.com
>>
>> ---
>> Yijie Yang (4):
>>        dt-bindings: arm: qcom: Document PURWA-IOT-EVK board
>>        firmware: qcom: scm: Allow QSEECOM on PURWA-IOT-EVK
>>        arm64: dts: qcom: Add PURWA-IOT-SOM platform
>>        arm64: dts: qcom: Add base PURWA-IOT-EVK board
>>
>>   Documentation/devicetree/bindings/arm/qcom.yaml |    6 +
>>   arch/arm64/boot/dts/qcom/Makefile               |    1 +
>>   arch/arm64/boot/dts/qcom/purwa-iot-evk.dts      | 1549 +++++++++++++++++++++++
>>   arch/arm64/boot/dts/qcom/purwa-iot-som.dtsi     |  685 ++++++++++
>>   drivers/firmware/qcom/qcom_scm.c                |    1 +
>>   5 files changed, 2242 insertions(+)
>> ---
>> base-commit: 6267b2da1b2d04847a1a8f441e138bc4a89435ee
>> change-id: 20251113-purwa-907ec75b4959
>>
>> Best regards,
>> --
>> Yijie Yang <yijie.yang@....qualcomm.com>
>>
>>
>>
> 
> 
> My bot found DTB warnings on the .dts/.dtsi files added or changed in
> this series.
> 
> Some warnings may be existing warnings. Consider fixing existing
> warnings before adding new features.
> 
> Perhaps the warnings are fixed by another series. If that is the case,
> please set the base commit and any dependencies for the series using
> "b4".
> 
> Ultimately, it is up to the platform maintainer whether these warnings
> are acceptable or not.
> 
> If you already ran DT checks and didn't see these error(s), then
> make sure dt-schema is up to date:
> 
>    pip3 install dtschema --upgrade
> 
> 
> This patch series was applied (using b4) to base:
>   Base: 6267b2da1b2d04847a1a8f441e138bc4a89435ee (use --merge-base to override)
> 
> If this is not the correct base, please add 'base-commit' tag
> (or use b4 which does this automatically)
> 
> 
> New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/qcom/' for 20260202-purwa-v5-0-1f5a93578802@....qualcomm.com:
> 
> arch/arm64/boot/dts/qcom/purwa-iot-evk.dtb: phy@...4000 (qcom,x1p42100-qmp-gen4x4-pcie-phy): 'qcom,4ln-config-sel' is a required property
> 	from schema $id: http://devicetree.org/schemas/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> 

I have already listed the fix in the cover letter:
https://lore.kernel.org/linux-arm-msm/20260119-topic-purwa_phy_shutup_warning-v1-1-997a692b31c6@oss.qualcomm.com/T/#u
It is not recommended to list it as a dependency in the latest version.


> 
> 
> 

-- 
Best Regards,
Yijie

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