linux-kernel - Re: [PATCH v3] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

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Message-ID: <807d50c4-5ee7-43d6-beab-7ce220911d41@oss.qualcomm.com>
Date: Thu, 24 Jul 2025 19:47:33 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: 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
Subject: Re: [PATCH v3] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE


On 7/23/2025 5:00 PM, Dmitry Baryshkov wrote:
> On Mon, Jun 30, 2025 at 02:20:15PM +0530, Kathiravan Thirumoorthy wrote:
>> QUPv3 in IPQ5424 consists of six Serial Engines (SEs). Describe the
>> first SE, which supports a 4-wire UART configuration suitable for
>> applications such as HS-UART.
>>
>> Note that the required initialization for this SE is not handled by the
>> bootloader. Therefore, add the SE node in the device tree but keep it
>> disabled. Enable it once Linux gains support for configuring the SE,
>> allowing to use in relevant RDPs.
> What about documenting it as status = "reserved" + comment and then
> enabling it once QUP patches land?


Sure. Let me update it in the next spin.