linux-kernel - Re: [PATCH 33/33] arm64: dts: ti: k3-j7*-ti-ipc-firmware: Switch MCU R5F cluster to Split-mode

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Message-ID: <f49bf01b-6704-4a03-9b3d-7f7495e544e0@ti.com>
Date: Fri, 15 Aug 2025 08:11:59 +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>, <jm@...com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 33/33] arm64: dts: ti: k3-j7*-ti-ipc-firmware: Switch MCU
 R5F cluster to Split-mode


On 8/15/2025 4:08 AM, Beleswar Padhi wrote:
> Several TI K3 SoCs like J7200, J721E, J721S2, J784S4 and J742S2 have a
> R5F cluster in the MCU domain which is configured for LockStep mode at
> the moment. The necessary support to use MCU R5F cluster in split mode
> was added in the bootloader. And the TI IPC firmware for the split
> processors is already available public.

It will be better to mention sha id of bootloader with links, may be 
below tear-line


> Therefore, Switch this R5F cluster to Split mode by default in all the
> boards using TI IPC Firmware config (k3-j7*-ti-ipc-firmware). This
> gives out an extra general purpose R5F core free to run any applications
> as required. Lockstep mode remains default in the SoC level dtsi, so
> downstream board dts which do not use TI IPC Firmware config should not
> be impacted by this switch.
>
> Users who prefer to use the fault-tolerant lockstep mode with TI IPC
> firmware config, can do that by setting `ti,cluster-mode` property to 1.

IMO,  you need to change boot-loader as well for this,


>
> Signed-off-by: Beleswar Padhi <b-padhi@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-j7200-ti-ipc-firmware.dtsi             | 1 +
>   arch/arm64/boot/dts/ti/k3-j721e-ti-ipc-firmware.dtsi             | 1 +
>   arch/arm64/boot/dts/ti/k3-j721s2-ti-ipc-firmware.dtsi            | 1 +
>   .../boot/dts/ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi     | 1 +
>   4 files changed, 4 insertions(+)
> [..]