linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: x1-el2: Add the APSS watchdog

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Message-ID: <vlo2zqrlh6uhjxwt7wvzerh7qgii2mbgnsnykfg2obq7avgysy@q6v7msawgrn2>
Date: Fri, 19 Dec 2025 00:11:39 +0200
From: Abel Vesa <abel.vesa@....qualcomm.com>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: 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>, linux-arm-msm@...r.kernel.org,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: x1-el2: Add the APSS watchdog

On 25-12-18 11:06:08, Stephan Gerhold wrote:
> On Sun, Dec 14, 2025 at 10:49:59PM +0200, Abel Vesa wrote:
> > 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 in the EL2
> > overlay.
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@....qualcomm.com>
> > ---
> >  arch/arm64/boot/dts/qcom/x1-el2.dtso | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/x1-el2.dtso b/arch/arm64/boot/dts/qcom/x1-el2.dtso
> > index 2d1c9151cf1b..404174a15659 100644
> > --- a/arch/arm64/boot/dts/qcom/x1-el2.dtso
> > +++ b/arch/arm64/boot/dts/qcom/x1-el2.dtso
> > @@ -7,6 +7,8 @@
> >  /dts-v1/;
> >  /plugin/;
> >  
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> >  /* We can't and don't need to use zap shader in EL2 as linux can zap the gpu on it's own. */
> >  &gpu_zap_shader {
> >  	status = "disabled";
> > @@ -55,3 +57,17 @@ &pcie_smmu {
> >  &sbsa_watchdog {
> >  	status = "disabled";
> >  };
> > +
> > +&soc {
> > +	#address-cells = <2>;
> > +	#size-cells = <2>;
> > +
> > +	/* The APSS watchdog is only accessible in EL2 */
> > +	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>;
> > +		interrupt-parent = <&intc>;
> > +	};
> 
> For consistency with &pcie_smmu, I think it would be cleaner to put this
> into hamoa.dtsi, mark it as status = "reserved"; and then enable it here
> in the overlay. That way, we have a full hardware description in
> hamoa.dtsi.

Sounds like a good idea. Will do that in v2.

> 
> You should also be able to drop the interrupt-parent if you move it
> there.

Yes. It will not be needed.

Thanks for reviewing,
Abel