Re: [PATCH RFC 2/6] arm64: dts: qcom: ipq5424: Add the IMEM node

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

On 4/10/2025 12:11 AM, Konrad Dybcio wrote:
> On 4/8/25 10:49 AM, Kathiravan Thirumoorthy wrote:
>> Add the IMEM node to the device tree to extract debugging information
>> like system restart reason, which is populated via IMEM. Define the
>> IMEM region to enable this functionality. Corresponding DTS and driver
>> changes will be added incrementally.
>>
>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
>> ---
>>   arch/arm64/boot/dts/qcom/ipq5424.dtsi | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> index 5d6ed2172b1bb0a57c593f121f387ec917f42419..a772736f314f46d11c473160c522af4edeb900b7 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> @@ -486,6 +486,15 @@ ssphy_0: phy@7d000 {
>>   			status = "disabled";
>>   		};
>>   
>> +		sram@8600000 {
>> +			compatible = "qcom,ipq5424-imem", "syscon", "simple-mfd";
>> +			reg = <0 0x08600000 0 0x1000>;
>> +			ranges = <0 0 0x08600000 0x1000>;
> It looks like this should be a little longer


Yes. It is 112KB. But only first 4KB is accessible by all masters in the 
system, remaining regions are access protected by TZ. I shall mention 
this in the commit message in the next version.


>
> Konrad