Message-Id: <176822994422.7758.4716561827275702939.robh@kernel.org>
Date: Mon, 12 Jan 2026 09:17:31 -0600
From: Rob Herring <robh@...nel.org>
To: Gatien Chevallier <gatien.chevallier@...s.st.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Mathieu Poirier <mathieu.poirier@...aro.org>, 
 Clément Le Goffic <legoffic.clement@...il.com>, 
 James Clark <james.clark@...aro.org>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, linux-gpio@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com, coresight@...ts.linaro.org, 
 Conor Dooley <conor+dt@...nel.org>, Mike Leach <mike.leach@...aro.org>, 
 Antonio Borneo <antonio.borneo@...s.st.com>, linux-kernel@...r.kernel.org, 
 Linus Walleij <linusw@...nel.org>, Leo Yan <leo.yan@...ux.dev>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [PATCH 00/11] bus: add stm32 debug bus and coresight support
 for stm32mp1x platforms


On Fri, 09 Jan 2026 11:55:00 +0100, Gatien Chevallier 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@...s.st.com>
> ---
> Gatien Chevallier (11):
>       dt-bindings: document access-controllers property for coresight peripherals
>       dt-bindings: pinctrl: document access-controllers property for stm32 HDP
>       dt-bindings: bus: document the stm32 debug bus
>       bus: stm32_firewall: allow check on different firewall controllers
>       drivers: bus: add the stm32 debug bus driver
>       arm: dts: stm32: introduce the debug bus for stm32mp1x platforms
>       arm: dts: stm32: enable the debug bus on stm32mp1x boards
>       arm: dts: stm32: enable CoreSight on stm32mp15xx-dkx boards
>       arm: dts: stm32: enable CoreSight on the stm32mp157c-ev1 board
>       arm: dts: stm32: enable CoreSight on the stm32mp135f-dk board
>       pinctrl: stm32: add firewall checks before probing the HDP driver
> 
>  .../devicetree/bindings/arm/arm,coresight-cti.yaml |   3 +
>  .../devicetree/bindings/arm/arm,coresight-etm.yaml |   3 +
>  .../devicetree/bindings/arm/arm,coresight-tmc.yaml |   3 +
>  .../bindings/arm/arm,coresight-tpiu.yaml           |   3 +
>  .../bindings/bus/st,stm32mp131-dbg-bus.yaml        |  86 +++++++
>  .../devicetree/bindings/pinctrl/st,stm32-hdp.yaml  |   4 +
>  MAINTAINERS                                        |   1 +
>  arch/arm/boot/dts/st/stm32mp131.dtsi               | 119 +++++++++
>  arch/arm/boot/dts/st/stm32mp135f-dk.dts            |  24 ++
>  arch/arm/boot/dts/st/stm32mp151.dtsi               | 173 +++++++++++++
>  arch/arm/boot/dts/st/stm32mp153.dtsi               |  68 +++++
>  arch/arm/boot/dts/st/stm32mp157c-ev1.dts           |  40 +++
>  arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi          |  40 +++
>  drivers/bus/Kconfig                                |  10 +
>  drivers/bus/Makefile                               |   1 +
>  drivers/bus/stm32_dbg_bus.c                        | 285 +++++++++++++++++++++
>  drivers/bus/stm32_firewall.c                       |   2 +-
>  drivers/pinctrl/stm32/pinctrl-stm32-hdp.c          |  41 +++
>  18 files changed, 905 insertions(+), 1 deletion(-)
> ---
> base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb
> change-id: 20260108-debug_bus-392666c7a3aa
> 
> Best regards,
> --
> Gatien Chevallier <gatien.chevallier@...s.st.com>
> 
> 
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


This patch series was applied (using b4) to base:
 Base: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb (use --merge-base to override)

If this is not the correct base, please add 'base-commit' tag
(or use b4 which does this automatically)

New warnings running 'make CHECK_DTBS=y for arch/arm/boot/dts/st/' for 20260109-debug_bus-v1-0-8f2142b5a738@...s.st.com:

arch/arm/boot/dts/st/stm32mp157c-dk2.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157c-ev1.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157c-dk2.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157c-ev1.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157a-dk1-scmi.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157a-dk1-scmi.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157a-dk1.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157a-dk1.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157f-dk2.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157f-dk2.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157c-ev1-scmi.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157c-ev1-scmi.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml
arch/arm/boot/dts/st/stm32mp157a-iot-box.dtb: serial@...10000 (st,stm32h7-uart): False schema does not allow [[44, 15, 1]]
	from schema $id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml
arch/arm/boot/dts/st/stm32mp157a-iot-box.dtb: serial@...10000 (st,stm32h7-uart): False schema does not allow [[45, 0, 1]]
	from schema $id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml
arch/arm/boot/dts/st/stm32mp157a-iot-box.dtb: serial@...10000 (st,stm32h7-uart): False schema does not allow [[44, 15, 1]]
	from schema $id: http://devicetree.org/schemas/serial/serial.yaml
arch/arm/boot/dts/st/stm32mp157a-iot-box.dtb: serial@...10000 (st,stm32h7-uart): False schema does not allow [[45, 0, 1]]
	from schema $id: http://devicetree.org/schemas/serial/serial.yaml
arch/arm/boot/dts/st/stm32mp157c-dk2-scmi.dtb: funnel@...91000 (arm,coresight-dynamic-funnel): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-dynamic-funnel.yaml
arch/arm/boot/dts/st/stm32mp157c-dk2-scmi.dtb: stm@...a0000 (arm,coresight-stm): Unevaluated properties are not allowed ('access-controllers' was unexpected)
	from schema $id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml

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