linux-kernel - [PATCH v3 2/3] arm64: dts: qcom: hamoa: Add the APSS watchdog

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Message-Id: <20251224-arm64-dts-qcom-x1e80100-el2-add-apss-wdt-v3-2-1801c55d2883@oss.qualcomm.com>
Date: Wed, 24 Dec 2025 12:45:21 +0200
From: Abel Vesa <abel.vesa@....qualcomm.com>
To: Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Stephan Gerhold <stephan.gerhold@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Abel Vesa <abel.vesa@....qualcomm.com>
Subject: [PATCH v3 2/3] arm64: dts: qcom: hamoa: Add the APSS watchdog

The watchdog support in EL1 is SBSA compliant, handled by Gunyah
hypervisor, but in EL2. the watchdog is an instance of the APSS WDT HW
block, same as older platforms. So describe the APSS WDT node and mark
it as reserved, as it will only be enabled in EL2 overlay.

Signed-off-by: Abel Vesa <abel.vesa@....qualcomm.com>
---
 arch/arm64/boot/dts/qcom/hamoa.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/hamoa.dtsi b/arch/arm64/boot/dts/qcom/hamoa.dtsi
index bb7c14d473c9..7a1f7e6860df 100644
--- a/arch/arm64/boot/dts/qcom/hamoa.dtsi
+++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi
@@ -8328,6 +8328,14 @@ gic_its: msi-controller@...40000 {
 			};
 		};
 
+		apss_watchdog: watchdog@...10000 {
+			compatible = "qcom,apss-wdt-x1e80100", "qcom,kpss-wdt";
+			reg = <0x0 0x17410000 0x0 0x1000>;
+			clocks = <&sleep_clk>;
+			interrupts = <GIC_SPI 0 IRQ_TYPE_EDGE_RISING>;
+			status = "reserved"; /* Reserved by Gunyah */
+		};
+
 		cpucp_mbox: mailbox@...30000 {
 			compatible = "qcom,x1e80100-cpucp-mbox";
 			reg = <0 0x17430000 0 0x10000>, <0 0x18830000 0 0x10000>;

-- 
2.48.1