linux-kernel - [PATCH 2/7] arm64: dts: qcom: ipq8074: Add the IMEM node

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Message-Id: <20250702-imem-v1-2-12d49b1ceff0@oss.qualcomm.com>
Date: Wed, 02 Jul 2025 15:47:34 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: 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,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
Subject: [PATCH 2/7] arm64: dts: qcom: ipq8074: Add the IMEM node

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 approximately 24KB but only initial
4KB is accessible by all masters in the SoC.

Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
---
 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..93dd11c394589132f3d5ecda32bcaecad2509029 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";
+			reg = <0x08600000 0x5fff>;
+			ranges = <0 0x08600000 0x5fff>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		usb_0: usb@...8800 {
 			compatible = "qcom,ipq8074-dwc3", "qcom,dwc3";
 			reg = <0x08af8800 0x400>;

-- 
2.34.1