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

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Message-ID: <e7ad63b7-523d-4193-97b8-d33601de78f6@kernel.org>
Date: Tue, 8 Jul 2025 08:47:08 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....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 2/6] arm64: dts: qcom: ipq8074: Add the IMEM node

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.

Best regards,
Krzysztof