Re: [PATCH v2 2/3] arm64: dts: qcom: hamoa: Add the APSS watchdog
From: Konrad Dybcio <hidden>
Date: 2025-12-19 12:15:05
Also in:
linux-arm-msm, linux-watchdog, lkml
On 12/19/25 11:00 AM, Abel Vesa wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- 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 a17900eacb20..b65dfad71c2f 100644 --- a/arch/arm64/boot/dts/qcom/hamoa.dtsi +++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi@@ -8302,6 +8302,14 @@ gic_its: msi-controller@17040000 { }; }; + apss_watchdog: watchdog@17410000 { + 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"; /* Accessible in EL2 only */
This is technically incorrect - it's not accessible if Gunyah is present, which is only somewhat related - if you run a different hypervisor which doesn't explicitly block access to this region, you can still access it even though Linux may be running at EL1 Konrad