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

["Kumar, Udit" <u-kumar1@ti.com>]

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@ti.com>
>> ---
>> [..]