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

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Message-ID: <febd6ziruli5qqk3vk5v44agpiorqb65miinsc53xomoqtynih@l4kk4xpmen4i>
Date: Tue, 23 Dec 2025 21:09:41 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Yijie Yang <yijie.yang@....qualcomm.com>, 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 Tue, Dec 23, 2025 at 06:27:05PM +0100, 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

Nah, I pointed out that the letter is incorrect. It's not just a
different firmware for the _same_ GPU. It's a different GPU revision.

-- 
With best wishes
Dmitry