Re: [PATCH v11 3/3] arm64: dts: qcom: ipq5424: add support to get watchdog bootstatus from IMEM

[Kathiravan Thirumoorthy]

On 7/27/2026 9:50 PM, Mukesh Ojha wrote:
> On Mon, Jul 27, 2026 at 09:17:37PM +0530, Kathiravan Thirumoorthy wrote:
> > Add the "sram" property to the watchdog device node to enable
> > retrieval of the system restart reason from IMEM, populated by XBL.
> Just checking if it's XBL and not TZ? who writes into IMEM.
>
> As when unsure, mentioning boot firmware is a better choice.

XBL consolidates the various SS reason codes and populates the final 
reason via IMEM, which is consumed by the watchdog driver.

> > Parse this information in the watchdog driver and update the bootstatus
> > sysFS if the restart was triggered by a watchdog timeout.
> >
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
> > Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@xxxxxxxxxxxxxxxx>
> > ---
> >   arch/arm64/boot/dts/qcom/ipq5424.dtsi | 5 +++++
> >   1 file changed, 5 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> > index ed61db0749f8..23f851e9241f 100644
> > --- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
> > @@ -624,6 +624,7 @@ watchdog@f410000 {
> >   			reg = <0 0x0f410000 0 0x1000>;
> >   			interrupts = <GIC_SPI 0 IRQ_TYPE_EDGE_RISING>;
> >   			clocks = <&sleep_clk>;
> > +			sram = <&restart_reason>;
> >   		};
> >   
> >   		qusb_phy_1: phy@71000 {
> > @@ -739,6 +740,10 @@ sram@8600000 {
> >   
> >   			#address-cells = <1>;
> >   			#size-cells = <1>;
> > +
> > +			restart_reason: restartreason-sram@7b0 {
> > +				reg = <0x7b0 0x4>;
> > +			};
> >   		};
> >   
> >   		usb3: usb3@8af8800 {
> >
> > --
> > 2.34.1