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

[Kumar, Udit]

Hello Andrew,

On 8/15/2025 9:18 PM, Andrew Davis wrote:
> On 8/14/25 5:38 PM, 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.
> >
> > 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.
>
> What a user prefers and other configuration like that does not belong
> in devicetree, which should only describe the hardware.
>
> Configuration should be done using the normal methods, like kernel
> cmdline, module params, ioctls, etc.. Maybe we can even set the mode
> based on some signal in the firmware itself, like in the resource table.
Agreed configuration part ,

but as default, what this CPU should be lock-step or cluster-mode


> Andrew
>
> > Signed-off-by: Beleswar Padhi <b-padhi@xxxxxx>
> > ---
> > [..]