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

[Kathiravan Thirumoorthy]

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@xxxxxxxxxxxxxxxx>
> > ---
> >   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