linux-kernel - [PATCH 4/7] arm64: dts: qcom: ipq5018: Add the IMEM node

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Message-Id: <20250702-imem-v1-4-12d49b1ceff0@oss.qualcomm.com>
Date: Wed, 02 Jul 2025 15:47:36 +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 4/7] arm64: dts: qcom: ipq5018: 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 80KB 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/ipq5018.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq5018.dtsi b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
index 130360014c5e14c778e348d37e601f60325b0b14..c57d855e373b7cb26a3533f4651df078c1188fd0 100644
--- a/arch/arm64/boot/dts/qcom/ipq5018.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
@@ -278,6 +278,15 @@ blsp1_spi1: spi@...5000 {
 			status = "disabled";
 		};
 
+		sram@...0000 {
+			compatible = "qcom,ipq5018-imem", "syscon", "simple-mfd";
+			reg = <0x08600000 0x14000>;
+			ranges = <0 0x08600000 0x14000>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		usb: usb@...8800 {
 			compatible = "qcom,ipq5018-dwc3", "qcom,dwc3";
 			reg = <0x08af8800 0x400>;

-- 
2.34.1