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

[Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>]

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@oss.qualcomm.com>
>> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
>> ---
>>   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
>>