linux-kernel - Re: [PATCH v3 2/2] arm64: dts: ti: k3-am62p-j722s-common-main: Add HSM M4F node

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Message-ID: <f4319457-6c2e-42b6-a57e-6f326c93fdcd@ti.com>
Date: Thu, 15 Jan 2026 10:06:01 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Beleswar Padhi <b-padhi@...com>, <nm@...com>, <vigneshr@...com>,
	<kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>
CC: <afd@...com>, <hnagalla@...com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<u-kumar1@...com>
Subject: Re: [PATCH v3 2/2] arm64: dts: ti: k3-am62p-j722s-common-main: Add
 HSM M4F node

Hi Beleswar,

On 1/14/2026 11:05 PM, Beleswar Padhi wrote:
> The TI K3 AM62P and J722S SoCs have a HSM (High Security Module) M4F
> core in the MAIN 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 common main dtsi file.
>
> 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.
>
> The corresponding reg ranges of HSM node has also been added to its
> parent node's (cbass_main bus) ranges 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/20260106104755.948086-4-b-padhi@ti.com/
>
> v2: Changelog:
> 1. None
>
> Link to v1:
> https://lore.kernel.org/all/20251231165102.950644-4-b-padhi@ti.com/
>
>   .../boot/dts/ti/k3-am62p-j722s-common-main.dtsi | 17 +++++++++++++++++
>   arch/arm64/boot/dts/ti/k3-am62p.dtsi            |  1 +
>   arch/arm64/boot/dts/ti/k3-j722s-main.dtsi       |  5 +++++
>   arch/arm64/boot/dts/ti/k3-j722s.dtsi            |  1 +
>   4 files changed, 24 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
> index 3cf7c2b3ce2dd..0e1af2a69ca2e 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
> @@ -1117,4 +1117,21 @@ vpu: video-codec@...10000 {
>   		clocks = <&k3_clks 204 2>;
>   		power-domains = <&k3_pds 204 TI_SCI_PD_EXCLUSIVE>;
>   	};
> +
> +	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 225 1>;
> +		firmware-name = "am62p-hsm-m4f-fw";

you don't need clock and power-domain for this ?


> +		bootph-pre-ram;
> +		ti,sci = <&dmsc>;
> +		ti,sci-dev-id = <225>;
> +		ti,sci-proc-ids = <0x80 0xff>;
> +		/* reserved for early-stage bootloader */
> +		status = "reserved";
> +	};
>   };
> diff --git a/arch/arm64/boot/dts/ti/k3-am62p.dtsi b/arch/arm64/boot/dts/ti/k3-am62p.dtsi
> index e2c01328eb298..9d6266d6ddb82 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62p.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62p.dtsi
> @@ -96,6 +96,7 @@ cbass_main: bus@...00 {
>   			 <0x00 0x31100000 0x00 0x31100000 0x00 0x00050000>, /* USB1 DWC3 Core window */
>   			 <0x00 0x40900000 0x00 0x40900000 0x00 0x00030000>, /* SA3UL */
> [..]