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

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Message-Id: <20250624-ipq5424_hsuart-v2-1-6566dabfe4a6@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 14:30:26 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: 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,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
Subject: [PATCH v2] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

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.

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";
+			};
+
 			uart1: serial@...4000 {
 				compatible = "qcom,geni-debug-uart";
 				reg = <0 0x01a84000 0 0x4000>;

---
base-commit: f817b6dd2b62d921a6cdc0a3ac599cd1851f343c
change-id: 20250624-ipq5424_hsuart-8b136b39ca18

Best regards,
-- 
Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>