linux-kernel - Re: [PATCH v2 3/6] arm64: dts: qcom: ipq6018: Add the IMEM node

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Message-ID: <dd2fab47-d451-43d2-b2d5-36d957c5aa46@oss.qualcomm.com>
Date: Wed, 9 Jul 2025 09:58:30 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: ipq6018: Add the IMEM node


On 7/8/2025 7:49 PM, Konrad Dybcio wrote:
> On 7/8/25 7:39 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.
>>
>> As described, overall IMEM region is 32KB but only initial 4KB is
>> accessible by all masters in the SoC.
>>
>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
>> ---
>> Changes in v2:
>> - Rounded off the size to 0x8000 (Konrad)
>> - Represent the reg's address space in hexadecimal format (Krzysztof)
>> ---
>> In 'ranges' property 0 is used instead of 0x0 to align with the existing
>> format.
>> ---
>>   arch/arm64/boot/dts/qcom/ipq6018.dtsi | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> index bfe59b0208415902c69fd0c0c7565d97997d4207..3b9e40045906b26b94e2d2510b0570d3eaf084ce 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> @@ -659,6 +659,15 @@ qpic_nand: nand-controller@...0000 {
>>   			status = "disabled";
>>   		};
>>   
>> +		sram@...0000 {
>> +			compatible = "qcom,ipq6018-imem", "syscon", "simple-mfd";
>> +			reg = <0x0 0x08600000 0x0 0x8000>;
>> +			ranges = <0 0 0x08600000 0x8000>;
>> +
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +		};
> On this platform, shouldn't it be 0x6860_0000?

Actually, that's from the RPM perspective. From the ARM side, the 
address is 0x0860_0000. The hardware docs show the RPM view by default, 
so please switch to the ARM view.

>
> Konrad