linux-kernel - Re: [PATCH v4] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

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Message-ID: <bspec62r6lewqxzq33zbkghun57g3omcllxacieojzakdykcqn@ffixkagm3owu>
Date: Tue, 12 Aug 2025 14:02:27 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....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 v4] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

On Tue, Aug 12, 2025 at 04:02:41PM +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
> reserved. Enable it once Linux gains support for configuring the SE,
> allowing to use in relevant RDPs.
> 
> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
> ---
> Changes in v4:
> - Keep the device in "reserved" state (Dmitry)
> - Link to v3:
>   https://lore.kernel.org/linux-arm-msm/20250630-ipq5424_hsuart-v3-1-fa0866b12cbc@oss.qualcomm.com/
> Changes in v3:
> - Add the pinctrl configuration for the SE (Konrad)
> - Link to v2:
>   https://lore.kernel.org/linux-arm-msm/20250624-ipq5424_hsuart-v2-1-6566dabfe4a6@oss.qualcomm.com/
> Changes in v2:
> - Correct the interrupt number
> - Link to v1:
>   https://lore.kernel.org/r/20250624-ipq5424_hsuart-v1-1-a4e71d00fc05@oss.qualcomm.com
> ---
> ---
>  arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts | 18 ++++++++++++++++++
>  arch/arm64/boot/dts/qcom/ipq5424.dtsi       |  9 +++++++++
>  2 files changed, 27 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry