linux-kernel - Re: [PATCH v2] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

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Message-ID: <bdf7e3e4-f1d1-4f3f-aebe-ded7b8091884@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 16:38:24 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

On 6/24/25 11:00 AM, 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.

Do you mean fw loading support?

> 
> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....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.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> index 66bd2261eb25d79051adddef604c55f5b01e6e8b..2b8499422a8a9a2f63e1af9ae8c189bafe690514 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> @@ -417,6 +417,15 @@ qupv3: geniqup@...0000 {
>  			#address-cells = <2>;
>  			#size-cells = <2>;
>  
> +			uart0: serial@...0000 {
> +				compatible = "qcom,geni-uart";
> +				reg = <0 0x01a80000 0 0x4000>;
> +				clocks = <&gcc GCC_QUPV3_UART0_CLK>;
> +				clock-names = "se";
> +				interrupts = <GIC_SPI 339 IRQ_TYPE_LEVEL_HIGH>;
> +				status = "disabled";
> +			};

I'd normally expect to see a pin configuration here as well,
especially since you mention the bootloader doesn't configure
the interface

Konrad