Merge tag 'stm32-bus-firewall-for-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel...

STM32 Firewall bus for v7.1, round 1

Highlights:
----------
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.

Plus some fixes.

* tag 'stm32-bus-firewall-for-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32:
  pinctrl: stm32: add firewall checks before probing the HDP driver
  drivers: bus: add the stm32 debug bus driver
  bus: stm32_firewall: add stm32_firewall_get_grant_all_access() API
  bus: stm32_firewall: allow check on different firewall controllers
  dt-bindings: bus: document the stm32 debug bus
  dt-bindings: pinctrl: document access-controllers property for stm32 HDP
  dt-bindings: document access-controllers property for coresight peripherals
  bus: rifsc: fix RIF configuration check for peripherals
  bus: rifsc: Replace snprintf("%s") with strscpy
  bus: stm32_firewall: Simplify with scoped for each OF child loop
  bus: firewall: move stm32_firewall header file in include folder

Signed-off-by: Arnd Bergmann <arnd@arndb.de>