[PATCH v4 10/11] arm64: dts: Add ELE firmware node and common include

From: Frieder Schrempf <[email protected]>

Add the firmware node to SoC dtsi and to make it easier for boards to
configure the EdgeLock Secure Enclave on i.MX93, add a common include
file that contains sane defaults. It specifies the memory node,
enables the ELE firmware node and adds a reference to NVMEM OCOTP
driver.

The 1MB memory area required for the firmware is placed in the first
256MB of the DDR. Boards that require a more specific alignment can
override this accordingly.

Signed-off-by: Frieder Schrempf <[email protected]>
---
 arch/arm64/boot/dts/freescale/imx91_93_common.dtsi |  9 +++++++
 arch/arm64/boot/dts/freescale/imx93-firmware.dtsi  | 28 ++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91_93_common.dtsi b/arch/arm64/boot/dts/freescale/imx91_93_common.dtsi
index a1a7e6a0571b..60798b216438 100644
--- a/arch/arm64/boot/dts/freescale/imx91_93_common.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx91_93_common.dtsi
@@ -46,6 +46,15 @@ A55_0: cpu@0 {
 		};
 	};
 
+	firmware {
+		hsm0: secure-enclave {
+			compatible = "fsl,imx93-se-ele-hsm";
+			mbox-names = "tx", "rx";
+			mboxes = <&s4muap 0 0>, <&s4muap 1 0>;
+			status = "disabled";
+		};
+	};
+
 	osc_32k: clock-osc-32k {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
diff --git a/arch/arm64/boot/dts/freescale/imx93-firmware.dtsi b/arch/arm64/boot/dts/freescale/imx93-firmware.dtsi
new file mode 100644
index 000000000000..58614158ef90
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx93-firmware.dtsi
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2026 Kontron Electronics GmbH
+ */
+
+/{
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		ele_memory: ele-memory {
+			compatible = "shared-dma-pool";
+			alloc-ranges = <0 0x80000000 0 0x10000000>;
+			size = <0 0x100000>;
+			no-map;
+		};
+	};
+};
+
+&hsm0 {
+	status = "okay";
+	memory-region = <&ele_memory>;
+};
+
+&ocotp {
+	secure-enclave = <&hsm0>;
+};

-- 
2.55.0