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

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Message-ID: <0593cc2e-0114-404f-929a-0860d60afefb@oss.qualcomm.com>
Date: Tue, 23 Dec 2025 18:27:05 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Yijie Yang <yijie.yang@....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 12/23/25 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

Konrad

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