arm64: dts: ti: k3-{j784s4-j742s2/j721s2}-mcu-wakeup: Add HSM M4F node

The TI K3 J721S2, J784S4 and J742S2 SoCs have a HSM (High Security
Module) M4F core in the Wakeup Voltage Domain which could be used to run
secure services like Authentication. Add Device Tree Node definitions
for the HSM core in the respective SoC wakeup dtsi files.

The HSM node is reserved to be loaded and booted by the early-stage
bootloader. The firmware-name property is defined at the SoC level
since the HSM is not a general-purpose remote core and boards are
unlikely to use separate firmware. If needed in exceptional cases,
board-specific device trees can override this property.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Link: https://patch.msgid.link/20260114173551.2545088-2-b-padhi@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

Author: 3V3RYONE

arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi

@@ -766,4 +766,21 @@
 		/* reserved for MCU_R5F0_1 */
 		status = "reserved";
 	};
+
+	hsm: remoteproc@43c00000 {
+		compatible = "ti,hsm-m4fss";
+		/* contiguous regions but instantiated separately in HW */
+		reg = <0x00 0x43c00000 0x00 0x20000>,
+		      <0x00 0x43c20000 0x00 0x10000>,
+		      <0x00 0x43c30000 0x00 0x10000>;
+		reg-names = "sram0_0", "sram0_1", "sram1";
+		resets = <&k3_reset 304 1>;
+		firmware-name = "j721s2-hsm-m4f-fw";
+		bootph-pre-ram;
+		ti,sci = <&sms>;
+		ti,sci-dev-id = <304>;
+		ti,sci-proc-ids = <0x80 0xff>;
+		/* reserved for early-stage bootloader */
+		status = "reserved";
+	};
 };

arch/arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi

@@ -15,3 +15,7 @@
 &mcu_r5fss0_core1 {
 	firmware-name = "j742s2-mcu-r5f0_1-fw";
 };
+
+&hsm {
+	firmware-name = "j742s2-hsm-m4f-fw";
+};

arch/arm64/boot/dts/ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi

@@ -762,4 +762,21 @@
 		/* reserved for MCU_R5F0_1 */
 		status = "reserved";
 	};
+
+	hsm: remoteproc@43c00000 {
+		compatible = "ti,hsm-m4fss";
+		/* contiguous regions but instantiated separately in HW */
+		reg = <0x00 0x43c00000 0x00 0x20000>,
+		      <0x00 0x43c20000 0x00 0x10000>,
+		      <0x00 0x43c30000 0x00 0x10000>;
+		reg-names = "sram0_0", "sram0_1", "sram1";
+		resets = <&k3_reset 371 1>;
+		firmware-name = "j784s4-hsm-m4f-fw";
+		bootph-pre-ram;
+		ti,sci = <&sms>;
+		ti,sci-dev-id = <371>;
+		ti,sci-proc-ids = <0x80 0xff>;
+		/* reserved for early-stage bootloader */
+		status = "reserved";
+	};
 };