Re: [PATCH 00/11] bus: add stm32 debug bus and coresight support for stm32mp1x platforms

[Gatien CHEVALLIER]

On 1/10/26 00:10, Linus Walleij wrote:
> Hi Gatien,
>
> thanks for your patch series!
>
> On Fri, Jan 9, 2026 at 11:56 AM Gatien Chevallier
> <gatien.chevallier@xxxxxxxxxxx> wrote:
>
> > Stm32 SoCs embed debug peripherals such as Coresight. These peripherals
> > can monitor the activity of the cores. Because of that, they can be
> > used only if some features in the debug configuration are enabled.
> > Else, errors or firewall exceptions can be observed. Similarly to
> > the ETZPC(on stm32mp1x platforms) or the RIFSC(on stm32mp2x platforms),
> > debug-related peripherals access can be assessed at bus level to
> > prevent these issues from happening.
> >
> > The debug configuration can only be accessed by the secure world.
> > That means that a service must be implemented in the secure world for
> > the kernel to check the firewall configuration. On OpenSTLinux, it is
> > done through a Debug access PTA in OP-TEE [1].
> > To represent the debug peripherals present on a dedicated debug bus,
> > create a debug bus node in the device tree and the associated driver
> > that will interact with this PTA.
> >
> > [1]: https://github.com/OP-TEE/optee_os/pull/7673
> >
> > Signed-off-by: Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
>
> I think Jens Wiklander wants to have a look at this partch
> series, so added him to the To:.
>
> Yours,
> Linus Walleij

Hi Linus,

Sure, I'll keep the To. addition for V2, thank you.

Best regards,
Gatien