[PATCH v14 3/6] arm64: dts: imx8ulp-evk: add nxp secure enclave firmware

[Pankaj Gupta <pankaj.gupta@xxxxxxx>]

Add support for NXP secure enclave called EdgeLock Enclave
firmware (se-fw) for imx8ulp-evk.

EdgeLock Enclave has a hardware limitation of restricted access to DDR
address: 0x80000000 to 0xafffffff, so reserve 1MB of DDR memory region
from 0x80000000.

Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
---
changes from v13 to v14
- added the blank line.
- removed the lines: #address-cells = <1>; , #size-cells = <0>;
- moved the ele-reserved under the parent node "reserved-memory".
- rename the node name "ele-reserved" to general name "memory".
---
 arch/arm64/boot/dts/freescale/imx8ulp-evk.dts | 12 +++++++++++-
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi    | 11 +++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
index 290a49bea2f7..10aaf02f8ea7 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
- * Copyright 2021 NXP
+ * Copyright 2021, 2025 NXP
  */
 
 /dts-v1/;
@@ -37,6 +37,12 @@ linux,cma {
 			linux,cma-default;
 		};
 
+		ele_reserved: memory@90000000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x90000000 0 0x100000>;
+			no-map;
+		};
+
 		m33_reserved: noncacheable-section@a8600000 {
 			reg = <0 0xa8600000 0 0x1000000>;
 			no-map;
@@ -259,6 +265,10 @@ &usdhc0 {
 	status = "okay";
 };
 
+&hsm0 {
+	memory-region = <&ele_reserved>;
+};
+
 &fec {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&pinctrl_enet>;
diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
index 2562a35286c2..05db47668b7e 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
- * Copyright 2021 NXP
+ * Copyright 2021, 2025 NXP
  */
 
 #include <dt-bindings/clock/imx8ulp-clock.h>
@@ -154,7 +154,7 @@ sosc: clock-sosc {
 		#clock-cells = <0>;
 	};
 
-	sram@2201f000 {
+	sram0: sram@2201f000 {
 		compatible = "mmio-sram";
 		reg = <0x0 0x2201f000 0x0 0x1000>;
 
@@ -186,6 +186,13 @@ scmi_sensor: protocol@15 {
 				#thermal-sensor-cells = <1>;
 			};
 		};
+
+		hsm0: secure-enclave {
+			 compatible = "fsl,imx8ulp-se-ele-hsm";
+			 mbox-names = "tx", "rx";
+			 mboxes = <&s4muap 0 0>, <&s4muap 1 0>;
+			 sram = <&sram0>;
+		 };
 	};
 
 	cm33: remoteproc-cm33 {

-- 
2.43.0