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    SubjectRe: [PATCH v2 0/2] STM32 Extended TrustZone Protection driver
    On Thu, Mar 01, 2018 at 02:58:04PM +0100, Benjamin Gaignard wrote:
    > On early boot stages STM32MP1 platform is able to dedicate some hardware blocks
    > to a secure OS running in TrustZone.
    > We need to avoid using those hardware blocks on non-secure context (i.e. kernel)
    > because read/write accesses could generate illegale access exceptions.
    >
    > Extended TrustZone Protection driver make sure that device is disabled if
    > non-secure world can't acces to it.
    >
    > version 2:
    > - do not use notifier anymore
    > - change status property value in device-tree if needed
    > - use a list of phandle instead of hard coded array

    As mentioned on v1, I don't think this should be done in Linux at all.

    If you wish to handle this dynamically, please fixup the DT *before*
    entering Linux.

    If you want a sane default in the dts file, put status = "disabled" on
    all nodes which the secure world might take ownership of.

    Thanks,
    Mark.

    > NOTE: Those patches should be applied only on
    > git://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git stm32-next
    > until this patch: https://lkml.org/lkml/2018/2/26/386
    > find it way to mainline because KBuild will complain about them.
    >
    > Benjamin Gaignard (2):
    > dt-bindings: stm32: Add bindings for Extended TrustZone Protection
    > ARM: mach-stm32: Add Extended TrustZone Protection driver
    >
    > .../bindings/arm/stm32/st,stm32mp1-etzpc.txt | 25 +++++
    > arch/arm/mach-stm32/Kconfig | 7 ++
    > arch/arm/mach-stm32/Makefile | 1 +
    > arch/arm/mach-stm32/stm32-etzpc.c | 116 +++++++++++++++++++++
    > 4 files changed, 149 insertions(+)
    > create mode 100644 Documentation/devicetree/bindings/arm/stm32/st,stm32mp1-etzpc.txt
    > create mode 100644 arch/arm/mach-stm32/stm32-etzpc.c
    >
    > --
    > 2.15.0
    >

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