[PATCH 3/5] arm: stm32mp: Implement support for TZC 400 controller

[Simon Glass]

Hi Alexandru,

On Thu, 4 Feb 2021 at 12:56, Alexandru Gagniuc <mr.nuke.me at gmail.com> wrote:
>
> The purpose of this change is to allow configuring TrustZone (TZC)
> memory permissions. For example, OP-TEE expects TZC regions to be
> configured in a very particular way. The API presented here is
> intended to allow exactly that.
>
> UCLASS support is not implemented, because it would not be too useful.
> Changing TZC permissions needs to be done with care, so as not to cut
> off access to memory we are currently using. One place where we can
> use this is at the end of SPL, right before jumping to OP-TEE.
>
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
> ---
>  arch/arm/mach-stm32mp/Makefile           |   1 +
>  arch/arm/mach-stm32mp/include/mach/tzc.h |  33 ++++++
>  arch/arm/mach-stm32mp/tzc400.c           | 135 +++++++++++++++++++++++
>  3 files changed, 169 insertions(+)
>  create mode 100644 arch/arm/mach-stm32mp/include/mach/tzc.h
>  create mode 100644 arch/arm/mach-stm32mp/tzc400.c

If this is an API you should add comments to the header file structs
and functions.

Is this API specific to just this chip?

Regards,
Simon