[PATCH v7 2/5] arm64: dts: qcom: ipq5424: Add the IMEM node
From: Kathiravan Thirumoorthy
Date: Wed Feb 25 2026 - 01:46:25 EST
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 112KB but only initial 4KB is
accessible by all masters in the SoC.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@xxxxxxxxxxxxxxxx>
---
Changes in v7:
- added the flag 'no-memory-wc'
- Picked up the R-b tag
Changes in v6:
- move to mmio-sram and drop the Konrad's R-b tag
Changes in v5:
- No changes
Changes in v4:
- No changes
Changes in v3:
- Picked up the R-b tag
Changes in v2:
- Describe the entire IMEM region in the node
- Explicitly call out that initial 4K only accessible by all
masters in the commit message
---
arch/arm64/boot/dts/qcom/ipq5424.dtsi | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
index eb393f3fd728f0b2fc8cd93c849f8c170d76e312..491bc3b00494c47c5524df069e9d65bb4654e863 100644
--- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
@@ -697,6 +697,17 @@ ssphy_0: phy@7d000 {
status = "disabled";
};
+ sram@8600000 {
+ compatible = "qcom,ipq5424-imem", "mmio-sram";
+ reg = <0 0x08600000 0 0x1c000>;
+ ranges = <0 0 0x08600000 0x1c000>;
+
+ no-memory-wc;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ };
+
usb3: usb3@8a00000 {
compatible = "qcom,ipq5424-dwc3", "qcom,dwc3";
reg = <0 0x08af8800 0 0x400>;
--
2.34.1