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

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Message-ID: <36aadb47-7cea-47cc-8952-6eab14c925e8@foss.st.com>
Date: Mon, 12 Jan 2026 16:56:45 +0100
From: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
To: Linus Walleij <linusw@...nel.org>,
        Jens Wiklander
	<jens.wiklander@...aro.org>
CC: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan
	<leo.yan@...ux.dev>,
        Clément Le Goffic
	<legoffic.clement@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Antonio Borneo <antonio.borneo@...s.st.com>
Subject: Re: [PATCH 00/11] bus: add stm32 debug bus and coresight support for
 stm32mp1x platforms



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@...s.st.com> 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>
> 
> 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