linux-kernel - Re: [PATCH v11 3/4] arm64: dts: qcom: Add HAMOA-IOT-SOM platform

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Message-ID: <aMfT1_uyZETUEBYk@linaro.org>
Date: Mon, 15 Sep 2025 10:52:39 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Yijie Yang <yijie.yang@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v11 3/4] arm64: dts: qcom: Add HAMOA-IOT-SOM platform

On Mon, Sep 15, 2025 at 10:12:15AM +0800, Yijie Yang wrote:
> 
> 
> On 2025-09-12 16:48, Stephan Gerhold wrote:
> > On Wed, Sep 10, 2025 at 05:02:11PM +0800, Yijie Yang wrote:
> > > The HAMOA-IOT-SOM is a compact computing module that integrates a System
> > > on Chip (SoC) — specifically the x1e80100 — 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
> > > - PCIe6a and its PHY
> > > - PCIe4 and its PHY
> > > - USB0 through USB6 and their PHYs
> > > - ADSP, CDSP
> > > - Graphic
> > > - Video
> > > 
> > > Written in collaboration with Yingying Tang (PCIe4)
> > > <quic_yintang@...cinc.com> and Wangao Wang (Video)
> > > <quic_wangaow@...cinc.com>.
> > 
> > This looks like you should have Co-developed-by: tags together with
> > their Signed-off-by: tags.
> 
> We’ve agreed on this as the preferred method for marking collaboration, as
> discussed earlier in this thread.
> 

I can't say I agree with Bjorn there, but ok, he's the maintainer. :-)

> > 
> > > 
> > > Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> > > Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi | 621 ++++++++++++++++++++++++++++
> > >   1 file changed, 621 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi b/arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi
> > > new file mode 100644
> > > index 000000000000..c7c3a167eb6a
> > > --- /dev/null
> > > +++ b/arch/arm64/boot/dts/qcom/hamoa-iot-som.dtsi
> > > @@ -0,0 +1,621 @@
> > > +// SPDX-License-Identifier: BSD-3-Clause
> > > +/*
> > > + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> > > + */
> > > +
> > > +#include "x1e80100.dtsi"
> > > +#include "x1e80100-pmics.dtsi"
> > > +#include <dt-bindings/gpio/gpio.h>
> > > +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
> > > +
> > > +/ {
> > > +	compatible = "hamoa-iot-som", "qcom,x1e80100";
> > 
> > Undocumented compatible (without "qcom," prefix). I think you can just
> > drop this?
> 
> This compatible string was also discussed previously and is the preferred
> choice. I’ll add the missing 'qcom,' prefix.
> 

Even compatible = "qcom,hamoa-iot-som", "qcom,x1e80100"; is not
documented. And it doesn't make much sense to document it either, each
of the boards using the SoM should have a more specific compatible and
therefore needs to override this property. I think you can really just
drop this line.

Thanks,
Stephan