linux-kernel - Re: [PATCH 0/4] Initial patch set for PURWA-IOT-EVK

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Message-ID: <d15c68bf-1a34-4024-b508-dc3f2676cdea@oss.qualcomm.com>
Date: Wed, 24 Dec 2025 10:02:47 +0800
From: Yijie Yang <yijie.yang@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....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 0/4] Initial patch set for PURWA-IOT-EVK



On 12/24/2025 1:27 AM, Konrad Dybcio wrote:
> On 12/23/25 3:12 AM, Yijie Yang wrote:
>>
>>
>> On 12/22/2025 5:18 PM, Dmitry Baryshkov wrote:
>>> On Mon, Dec 22, 2025 at 02:03:25PM +0800, YijieYang wrote:
>>>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>>>
>>>> Introduce the device tree, DT bindings, and driver modifications required
>>>> to bring up the PURWA-IOT-EVK evaluation board.
>>>>
>>>> Purwa and Hamoa are IoT variants of x1p42100 and x1e80100, both based on
>>>> the IQ-X SoC series. Consequently, the two common files in this series are
>>>> prefixed with 'iq-x-iot' to reflect this relationship.
>>>>
>>>> PURWA-IOT-EVK shares almost the same hardware design with HAMOA-IOT-EVK,
>>>> except for differences in the BOM. As a result, most of the DTS can be
>>>> shared between them.
>>>>
>>>> The changes focus on two key hardware components: the PURWA-IOT-SOM and
>>>> the PURWA-IOT-EVK carrier board.
>>>>
>>>> Hardware delta between Hamoa and Purwa:
>>>> - Display: Purwa’s display uses a different number of clocks, and its
>>>>     frequency differs from Hamoa.
>>>> - GPU: Purwa requires a separate firmware compared to Hamoa.
>>>
>>> Is it just a separate firmware, or does it use a different _GPU_?
>>
>> It uses a different GPU.
> 
> I think it would be useful to call this paragraph "Hardware delta between
> Hamoa-IoT-SoM/EVK and Purwa-IoT-whatever - because now Dmitry is asking
> about differences between Hamoa-the-SoC and Purwa-the-SoC which we
> expressed in purwa.dtsi

I want to provide readers with a comprehensive comparison of the two 
boards, Hamoa-IoT-EVK and Purwa-IoT-EVK, covering all differences in 
both the SOM and the carrier board.

> 
> Konrad
> 
>>
>>>
>>>> - USB0: Purwa uses a PS8833 retimer, while Hamoa uses an FSUSB42 as the
>>>>     SBU switch.
>>>>
>>>
>>

-- 
Best Regards,
Yijie