linux-kernel - [PATCH 5/7] arm64: dts: qcom: ipq9574: Add the IMEM node

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Message-Id: <20250702-imem-v1-5-12d49b1ceff0@oss.qualcomm.com>
Date: Wed, 02 Jul 2025 15:47:37 +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 5/7] arm64: dts: qcom: ipq9574: 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 32KB 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/ipq9574.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
index 815b5f9540b80e91e81e02a97b20c0426f40b003..2a42e8a9c79274f2b983d31e0b7b587ad524b211 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
@@ -741,6 +741,15 @@ usb_0_qmpphy: phy@...00 {
 			status = "disabled";
 		};
 
+		sram@...0000 {
+			compatible = "qcom,ipq9574-imem", "syscon", "simple-mfd";
+			reg = <0x08600000 0x8000>;
+			ranges = <0 0x08600000 0x8000>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		usb3: usb@...8800 {
 			compatible = "qcom,ipq9574-dwc3", "qcom,dwc3";
 			reg = <0x08af8800 0x400>;

-- 
2.34.1