linux-kernel - [PATCH v3 1/2] arm64: dts: ti: k3-{j784s4-j742s2/j721s2}-mcu-wakeup: Add HSM M4F node

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Message-ID: <20260114173551.2545088-2-b-padhi@ti.com>
Date: Wed, 14 Jan 2026 23:05:50 +0530
From: Beleswar Padhi <b-padhi@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <afd@...com>, <u-kumar1@...com>, <hnagalla@...com>, <b-padhi@...com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v3 1/2] 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@...com>
---
v3: Changelog:
[Nishanth]:
 1. Use generic node name 'remoteproc'
 2. Use label 'hsm' instead of 'hsm_m4fss'
 3. Add a comment for separate SRAMs
 4. Update firmware-name property to match existing naming conventions
 5. Change status to 'reserved' and add a commment
 6. Re-order bootph-pre-ram property before vendor properties
 7. Update commit msg adding rationale for firmware-name in SoC.dtsi

Link to v2:
https://lore.kernel.org/all/20260106104755.948086-3-b-padhi@ti.com/

v2: Changelog:
1. None

Link to v1:
https://lore.kernel.org/all/20251231165102.950644-3-b-padhi@ti.com/

 .../arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi | 17 +++++++++++++++++
 .../arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi |  4 ++++
 .../ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi  | 17 +++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
index fd01437726ab4..32ee8031cfcb6 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
@@ -766,4 +766,21 @@ mcu_watchdog1: watchdog@...10000 {
 		/* reserved for MCU_R5F0_1 */
 		status = "reserved";
 	};
+
+	hsm: remoteproc@...00000 {
+		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";
+	};
 };
diff --git a/arch/arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi
index 61db2348d6a47..2f40afcfa67c4 100644
--- a/arch/arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j742s2-mcu-wakeup.dtsi
@@ -15,3 +15,7 @@ &mcu_r5fss0_core0 {
 &mcu_r5fss0_core1 {
 	firmware-name = "j742s2-mcu-r5f0_1-fw";
 };
+
+&hsm {
+	firmware-name = "j742s2-hsm-m4f-fw";
+};
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi
index cc22bfb5f5996..df37902c963ff 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-mcu-wakeup-common.dtsi
@@ -762,4 +762,21 @@ mcu_watchdog1: watchdog@...10000 {
 		/* reserved for MCU_R5F0_1 */
 		status = "reserved";
 	};
+
+	hsm: remoteproc@...00000 {
+		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";
+	};
 };
-- 
2.34.1