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

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Message-ID: <cjp7sppitjxu4utsag3dqn4k3hvfsczcnv3h32uwjotwidklin@xmxbe3jqmovs>
Date: Tue, 13 Jan 2026 19:50:50 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: YijieYang <yijie.yang@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....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 v3 3/4] arm64: dts: qcom: Add PURWA-IOT-SOM platform

On Tue, Jan 13, 2026 at 12:29:43PM +0100, Konrad Dybcio wrote:
> 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

=> commit message, please.

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

-- 
With best wishes
Dmitry