linux-kernel - Re: [PATCH 05/11] drivers: bus: add the stm32 debug bus driver

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Message-ID: <8b3b6cb6-31d0-425e-9894-bf33f2ea3dda@foss.st.com>
Date: Tue, 13 Jan 2026 17:09:31 +0100
From: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
To: 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>,
        Linus Walleij <linusw@...nel.org>,
        "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>
Subject: Re: [PATCH 05/11] drivers: bus: add the stm32 debug bus driver



On 1/13/26 15:45, Jens Wiklander wrote:
> Hi,
> 
> On Fri, Jan 9, 2026 at 11:57 AM Gatien Chevallier
> <gatien.chevallier@...s.st.com> wrote:
>>
>> Add the stm32 debug bus driver that is responsible of checking the
>> debug subsystem accessibility before probing the related peripheral
>> drivers.
>>
>> This driver is OP-TEE dependent and relies on the STM32 debug access
>> PTA.
>>
>> Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
>> ---
>>   MAINTAINERS                 |   1 +
>>   drivers/bus/Kconfig         |  10 ++
>>   drivers/bus/Makefile        |   1 +
>>   drivers/bus/stm32_dbg_bus.c | 285 ++++++++++++++++++++++++++++++++++++++++++++
>>   4 files changed, 297 insertions(+)
>>
> 
> [snip]
> 
>> +
>> +static const struct tee_client_device_id optee_dbg_bus_id_table[] = {
>> +       {UUID_INIT(0xdd05bc8b, 0x9f3b, 0x49f0,
>> +                  0xb6, 0x49, 0x01, 0xaa, 0x10, 0xc1, 0xc2, 0x10)},
>> +       {}
>> +};
>> +
>> +static struct tee_client_driver stm32_optee_dbg_bus_driver = {
>> +       .id_table = optee_dbg_bus_id_table,
>> +       .driver = {
>> +               .name = "optee_dbg_bus",
>> +               .bus = &tee_bus_type,
>> +               .probe = stm32_dbg_bus_probe,
>> +               .remove = stm32_dbg_bus_remove,
>> +       },
>> +};
> 
> Just a heads up. With
> https://lore.kernel.org/op-tee/cover.1765791463.git.u.kleine-koenig@baylibre.com/
> we're switching to use bus methods instead of device_driver callbacks.
> That plan is to merge that patch set in the next merge window.
> 
> Cheers,
> Jens
> 

Hello Jens,

Thank you for the link!
Is it fine if I push on top on your "next" branch for the review along
with the appropriate changes? I'm open to suggestions.

Thanks,
Gatien

>> +
>> +static int __init optee_dbg_bus_mod_init(void)
>> +{
>> +       int ret;
>> +
>> +       ret = driver_register(&stm32_optee_dbg_bus_driver.driver);
>> +       if (ret)
>> +               return ret;
>> +
>> +       ret = platform_driver_register(&stm32_dbg_bus_driver);
>> +       if (ret)
>> +               driver_unregister(&stm32_optee_dbg_bus_driver.driver);
>> +
>> +       return ret;
>> +}
>> +
>> +static void __exit optee_dbg_bus_mod_exit(void)
>> +{
>> +       platform_driver_unregister(&stm32_dbg_bus_driver);
>> +       driver_unregister(&stm32_optee_dbg_bus_driver.driver);
>> +}
>> +
>> +module_init(optee_dbg_bus_mod_init);
>> +module_exit(optee_dbg_bus_mod_exit);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Gatien Chevallier <gatien.chevallier@...s.st.com>");
>> +MODULE_DESCRIPTION("OP-TEE based STM32 debug access bus driver");
>>
>> --
>> 2.43.0
>>
>>