linux-kernel - Re: [PATCH v5 0/3] Initial support for Qualcomm Hamoa IOT EVK board

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Message-ID: <63ecde5c-8234-4630-97e8-5806b9ff3eea@kernel.org>
Date: Thu, 14 Aug 2025 11:05:53 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yijie Yang <yijie.yang@....qualcomm.com>,
 Dmitry Baryshkov <dmitry.baryshkov@....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,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Yingying Tang <quic_yintang@...cinc.com>,
 Shuai Zhang <quic_shuaz@...cinc.com>, Yongxing Mou <quic_yongmou@...cinc.com>
Subject: Re: [PATCH v5 0/3] Initial support for Qualcomm Hamoa IOT EVK board

On 14/08/2025 10:54, Yijie Yang wrote:
> 
> 
> On 2025-08-14 16:24, Dmitry Baryshkov wrote:
>> On Thu, Aug 14, 2025 at 03:27:27PM +0800, Yijie Yang wrote:
>>> Introduce the device tree, DT bindings, and driver modifications required
>>> to bring up the HAMOA-IOT-EVK evaluation board—based on the X1E80100 SoC—to
>>> a UART shell.
>>> This patch set focuses on two key hardware components: the HAMOA-IOT-SOM
>>> and the HAMOA-IOT-EVK carrier board.
>>> The HAMOA-IOT-SOM is a compact System on Module that integrates the SoC,
>>> GPIOs, and PMICs. It is designed to be modular and can be paired with
>>> various carrier boards to support different use cases.
>>> The HAMOA-IOT-EVK is one such carrier board, designed for IoT scenarios.
>>> It provides essential peripherals such as UART, on-board PMICs, and
>>> USB-related components.
>>> Together, these components form a flexible and scalable platform, and this
>>> patch set enables their initial bring-up through proper device tree
>>> configuration and driver support.
>>>
>>> Qualcomm SoCs often have multiple product variants, each identified by a
>>> different SoC ID. For instance, the x1e80100 SoC has closely related
>>> variants such as x1e78100 and x1e001de. This diversity in SoC identifiers
>>> can lead to confusion and unnecessary maintenance complexity in the device
>>> tree and related subsystems.
>>> To address this, code names offer a more consistent and project-agnostic
>>> way to represent SoC families. They tend to remain stable across
>>> development efforts.
>>> This patch series introduces "hamoa" as the codename for the x1e80100 SoC.
>>> Going forward, all x1e80100-related variants—including x1e81000 and others
>>> in the same family—will be represented under the "hamoa" designation in the
>>> device tree.
>>> This improves readability, streamlines future maintenance, and aligns with
>>> common naming practices across Qualcomm-based platforms.
>>>
>>> Features added and enabled:
>>> - UART
>>> - On-board regulators
>>> - Regulators on the SOM
>>> - PMIC GLINK
>>> - USB0 through USB6 and their PHYs
>>> - Embedded USB (eUSB) repeaters
>>> - USB Type-C mux
>>> - PCIe6a and its PHY
>>> - PCIe4 and its PHY
>>> - Reserved memory regions
>>> - Pinctrl
>>> - NVMe
>>> - ADSP, CDSP
>>> - WLAN, Bluetooth (M.2 interface)
>>> - USB DisplayPort
>>>
>>> DTS Dependency:
>>> https://lore.kernel.org/all/20250724-move-edp-endpoints-v1-3-6ca569812838@oss.qualcomm.com/
>>>
>>> Signed-off-by: Yijie Yang <yijie.yang@....qualcomm.com>
>>> ---
>>> To: Bjorn Andersson <andersson@...nel.org>
>>> To: Konrad Dybcio <konradybcio@...nel.org>
>>> To: Rob Herring <robh@...nel.org>
>>> To: Krzysztof Kozlowski <krzk+dt@...nel.org>
>>> To: Conor Dooley <conor+dt@...nel.org>
>>> Cc: linux-arm-msm@...r.kernel.org
>>> Cc: devicetree@...r.kernel.org
>>> Cc: linux-kernel@...r.kernel.org
>>>
>>> ---
>>> Changes in v5:
>>> - Update base commit.
>>> - Drop an already merged patch:
>>> https://lore.kernel.org/all/20250804-hamoa_initial-v4-2-19edbb28677b@oss.qualcomm.com/
>>> - Link to v4: https://lore.kernel.org/r/20250804-hamoa_initial-v4-0-19edbb28677b@oss.qualcomm.com
>>
>> Please keep full changelog rather than trimming previous iterations.
> 
> Sure, I will restore them.
> 
>>
>> Also, is there a reason why you didn't pick up audio and display chunks
>> as it was requested on the corresponding reviews?
> 
> Display-related changes have been merged into '[PATCH v5 3/3] arm64: 
> dts: qcom: Add base HAMOA-IOT-EVK board' and are already present there.
> 
> Audio support is still under debugging due to unresolved issues, and 
> it's unclear when it will be ready. Would it be acceptable to proceed 
> without it for now?
Audio was sent to the lists, so this is confusing. What was the point of
that posting? It clearly said:

"Basic test is good in Hamoa-IOT-EVK board."

So was that true or not?

Best regards,
Krzysztof