linux-kernel - Re: [PATCH v2 2/6] arm64: dts: qcom: ipq8074: Add the IMEM node

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Message-ID: <c22172c5-7794-4f88-931a-c578c906d91c@oss.qualcomm.com>
Date: Tue, 8 Jul 2025 15:49:15 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 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 2/6] arm64: dts: qcom: ipq8074: Add the IMEM node


On 7/8/2025 12:17 PM, Krzysztof Kozlowski wrote:
> On 08/07/2025 07:39, 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 24KB 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 0x6000 (Konrad)
>> ---
>>   arch/arm64/boot/dts/qcom/ipq8074.dtsi | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq8074.dtsi b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> index fffb47ec244899cf45984adbe8c4f9820bef5c5f..2ba07a02c222958b924c5bc178ac67f955088f7a 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> @@ -625,6 +625,15 @@ qpic_nand: nand-controller@...0000 {
>>   			status = "disabled";
>>   		};
>>   
>> +		sram@...0000 {
>> +			compatible = "qcom,ipq8074-imem", "syscon", "simple-mfd";
>
> It is still not simple-mfd. You should post complete node with children
> or do not make it a simple-mfd.


Sure. Based on the outcome of the series[1], will update it.

[1] 
https://lore.kernel.org/linux-arm-msm/073480a2-0b6f-4dc0-b7eb-eec500b3106e@oss.qualcomm.com/


>
> Best regards,
> Krzysztof