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

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Message-Id: <20250708-imem-v2-2-692eb92b228e@oss.qualcomm.com>
Date: Tue, 08 Jul 2025 11:09:12 +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 v2 2/6] 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 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";
+			reg = <0x08600000 0x6000>;
+			ranges = <0 0x08600000 0x6000>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		usb_0: usb@...8800 {
 			compatible = "qcom,ipq8074-dwc3", "qcom,dwc3";
 			reg = <0x08af8800 0x400>;

-- 
2.34.1