linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8450: Add IMEM and PIL info region

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Date:   Mon, 6 Feb 2023 13:04:55 -0800
From:   Bjorn Andersson <andersson@...nel.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>, agross@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8450: Add IMEM and PIL info
 region

On Mon, Feb 06, 2023 at 08:06:13PM +0530, Mukesh Ojha wrote:
> 
> 
> On 2/4/2023 3:07 AM, Konrad Dybcio wrote:
> > 
> > 
> > On 3.02.2023 18:04, Mukesh Ojha wrote:
> > > Add a simple-mfd representing IMEM on SM8450 and define the PIL
> > > relocation info region, so that post mortem tools will be able
> > > to locate the loaded remoteprocs.
> > > 
> > > Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> > > ---
> >  From XBL:
> > 
> > 0x14680000, 0x0002A000, "IMEM Base"
> > 
> > Is there anything in that wider address range that would interest
> > us? I recall Alex once dug into that when diving into IPA, but
> > I can not recall the conclusion..
> Spec-wise, yes IPA do own these 0x146A8000 - 0x146AA000 .
> But, not sure what they use it for.
> 

The DT should not reflect the organization structure. Let's see if Alex
have any input on this.

Thanks,
Bjorn

> -Mukesh
> > 
> > Konrad
> > >   arch/arm64/boot/dts/qcom/sm8450.dtsi | 15 +++++++++++++++
> > >   1 file changed, 15 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> > > index 5704750..474ea1b 100644
> > > --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> > > @@ -3536,6 +3536,21 @@
> > >   			};
> > >   		};
> > > +		sram@...aa000 {
> > > +			compatible = "qcom,sm8450-imem", "syscon", "simple-mfd";
> > > +			reg = <0 0x146aa000 0 0x1000>;
> > > +
> > > +			#address-cells = <1>;
> > > +			#size-cells = <1>;
> > > +
> > > +			ranges = <0 0 0x146aa000 0x1000>;
> > > +
> > > +			pil-reloc@94c {
> > > +				compatible = "qcom,pil-reloc-info";
> > > +				reg = <0x94c 0xc8>;
> > > +			};
> > > +		};
> > > +
> > >   		apps_rsc: rsc@...00000 {
> > >   			label = "apps_rsc";
> > >   			compatible = "qcom,rpmh-rsc";