[PATCH v2 00/17] tee: Use bus callbacks instead of driver callbacks

[PATCH v2 00/17] tee: Use bus callbacks instead of driver callbacks

[Uwe Kleine-König]

Hello,

the objective of this series is to make tee driver stop using callbacks
in struct device_driver. These were superseded by bus methods in 2006
(commit 594c8281f905 ("[PATCH] Add bus_type probe, remove, shutdown
methods.")) but nobody cared to convert all subsystems accordingly.

Here the tee drivers are converted. The first commit is somewhat
unrelated, but simplifies the conversion (and the drivers). It
introduces driver registration helpers that care about setting the bus
and owner. (The latter is missing in all drivers, so by using these
helpers the drivers become more correct.)

v1 of this series is available at
https://lore.kernel.org/all/cover.1765472125.git.u.kleine-koenig@baylibre.com

Changes since v1:

 - rebase to v6.19-rc1 (no conflicts)
 - add tags received so far
 - fix whitespace issues pointed out by Sumit Garg
 - fix shutdown callback to shutdown and not remove

As already noted in v1's cover letter, this series should go in during a
single merge window as there are runtime warnings when the series is
only applied partially. Sumit Garg suggested to apply the whole series
via Jens Wiklander's tree.
If this is done the dependencies in this series are honored, in case the
plan changes: Patches #4 - #17 depend on the first two.

Note this series is only build tested.

Uwe Kleine-König (17):
  tee: Add some helpers to reduce boilerplate for tee client drivers
  tee: Add probe, remove and shutdown bus callbacks to tee_client_driver
  tee: Adapt documentation to cover recent additions
  hwrng: optee - Make use of module_tee_client_driver()
  hwrng: optee - Make use of tee bus methods
  rtc: optee: Migrate to use tee specific driver registration function
  rtc: optee: Make use of tee bus methods
  efi: stmm: Make use of module_tee_client_driver()
  efi: stmm: Make use of tee bus methods
  firmware: arm_scmi: optee: Make use of module_tee_client_driver()
  firmware: arm_scmi: Make use of tee bus methods
  firmware: tee_bnxt: Make use of module_tee_client_driver()
  firmware: tee_bnxt: Make use of tee bus methods
  KEYS: trusted: Migrate to use tee specific driver registration
    function
  KEYS: trusted: Make use of tee bus methods
  tpm/tpm_ftpm_tee: Make use of tee specific driver registration
  tpm/tpm_ftpm_tee: Make use of tee bus methods

 Documentation/driver-api/tee.rst             | 18 +----
 drivers/char/hw_random/optee-rng.c           | 26 ++----
 drivers/char/tpm/tpm_ftpm_tee.c              | 31 +++++---
 drivers/firmware/arm_scmi/transports/optee.c | 32 +++-----
 drivers/firmware/broadcom/tee_bnxt_fw.c      | 30 ++-----
 drivers/firmware/efi/stmm/tee_stmm_efi.c     | 25 ++----
 drivers/rtc/rtc-optee.c                      | 27 ++-----
 drivers/tee/tee_core.c                       | 84 ++++++++++++++++++++
 include/linux/tee_drv.h                      | 12 +++
 security/keys/trusted-keys/trusted_tee.c     | 17 ++--
 10 files changed, 164 insertions(+), 138 deletions(-)

base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
-- 
2.47.3

[PATCH v2 08/17] efi: stmm: Make use of module_tee_client_driver()

[Uwe Kleine-König]

Reduce boilerplate by using the newly introduced module_tee_client_driver().
That takes care of assigning the driver's bus, so the explicit assigning
in this driver can be dropped.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/firmware/efi/stmm/tee_stmm_efi.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/firmware/efi/stmm/tee_stmm_efi.c b/drivers/firmware/efi/stmm/tee_stmm_efi.c
index 65c0fe1ba275..5903811858b6 100644
--- a/drivers/firmware/efi/stmm/tee_stmm_efi.c
+++ b/drivers/firmware/efi/stmm/tee_stmm_efi.c
@@ -584,24 +584,12 @@ static struct tee_client_driver tee_stmm_efi_driver = {
 	.id_table	= tee_stmm_efi_id_table,
 	.driver		= {
 		.name		= "tee-stmm-efi",
-		.bus		= &tee_bus_type,
 		.probe		= tee_stmm_efi_probe,
 		.remove		= tee_stmm_efi_remove,
 	},
 };
 
-static int __init tee_stmm_efi_mod_init(void)
-{
-	return driver_register(&tee_stmm_efi_driver.driver);
-}
-
-static void __exit tee_stmm_efi_mod_exit(void)
-{
-	driver_unregister(&tee_stmm_efi_driver.driver);
-}
-
-module_init(tee_stmm_efi_mod_init);
-module_exit(tee_stmm_efi_mod_exit);
+module_tee_client_driver(tee_stmm_efi_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Ilias Apalodimas <ilias.apalodimas@linaro.org>");
-- 
2.47.3

Re: [PATCH v2 08/17] efi: stmm: Make use of module_tee_client_driver()

[Ilias Apalodimas]

On Mon, 15 Dec 2025 at 16:17, Uwe Kleine-König
<u.kleine-koenig@baylibre.com> wrote:
>
> Reduce boilerplate by using the newly introduced module_tee_client_driver().
> That takes care of assigning the driver's bus, so the explicit assigning
> in this driver can be dropped.
>
> Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
> ---

Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

>  drivers/firmware/efi/stmm/tee_stmm_efi.c | 14 +-------------
>  1 file changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/drivers/firmware/efi/stmm/tee_stmm_efi.c b/drivers/firmware/efi/stmm/tee_stmm_efi.c
> index 65c0fe1ba275..5903811858b6 100644
> --- a/drivers/firmware/efi/stmm/tee_stmm_efi.c
> +++ b/drivers/firmware/efi/stmm/tee_stmm_efi.c
> @@ -584,24 +584,12 @@ static struct tee_client_driver tee_stmm_efi_driver = {
>         .id_table       = tee_stmm_efi_id_table,
>         .driver         = {
>                 .name           = "tee-stmm-efi",
> -               .bus            = &tee_bus_type,
>                 .probe          = tee_stmm_efi_probe,
>                 .remove         = tee_stmm_efi_remove,
>         },
>  };
>
> -static int __init tee_stmm_efi_mod_init(void)
> -{
> -       return driver_register(&tee_stmm_efi_driver.driver);
> -}
> -
> -static void __exit tee_stmm_efi_mod_exit(void)
> -{
> -       driver_unregister(&tee_stmm_efi_driver.driver);
> -}
> -
> -module_init(tee_stmm_efi_mod_init);
> -module_exit(tee_stmm_efi_mod_exit);
> +module_tee_client_driver(tee_stmm_efi_driver);
>
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Ilias Apalodimas <ilias.apalodimas@linaro.org>");
> --
> 2.47.3
>

[PATCH v2 09/17] efi: stmm: Make use of tee bus methods

[Uwe Kleine-König]

The tee bus got dedicated callbacks for probe and remove.
Make use of these. This fixes a runtime warning about the driver needing
to be converted to the bus methods.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/firmware/efi/stmm/tee_stmm_efi.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/efi/stmm/tee_stmm_efi.c b/drivers/firmware/efi/stmm/tee_stmm_efi.c
index 5903811858b6..7b04dd649629 100644
--- a/drivers/firmware/efi/stmm/tee_stmm_efi.c
+++ b/drivers/firmware/efi/stmm/tee_stmm_efi.c
@@ -520,8 +520,9 @@ static void tee_stmm_restore_efivars_generic_ops(void)
 	efivars_generic_ops_register();
 }
 
-static int tee_stmm_efi_probe(struct device *dev)
+static int tee_stmm_efi_probe(struct tee_client_device *tee_dev)
 {
+	struct device *dev = &tee_dev->dev;
 	struct tee_ioctl_open_session_arg sess_arg;
 	efi_status_t ret;
 	int rc;
@@ -571,21 +572,19 @@ static int tee_stmm_efi_probe(struct device *dev)
 	return 0;
 }
 
-static int tee_stmm_efi_remove(struct device *dev)
+static void tee_stmm_efi_remove(struct tee_client_device *dev)
 {
 	tee_stmm_restore_efivars_generic_ops();
-
-	return 0;
 }
 
 MODULE_DEVICE_TABLE(tee, tee_stmm_efi_id_table);
 
 static struct tee_client_driver tee_stmm_efi_driver = {
 	.id_table	= tee_stmm_efi_id_table,
+	.probe		= tee_stmm_efi_probe,
+	.remove		= tee_stmm_efi_remove,
 	.driver		= {
 		.name		= "tee-stmm-efi",
-		.probe		= tee_stmm_efi_probe,
-		.remove		= tee_stmm_efi_remove,
 	},
 };
 
-- 
2.47.3

Re: [PATCH v2 09/17] efi: stmm: Make use of tee bus methods

[Ilias Apalodimas]

On Mon, 15 Dec 2025 at 16:17, Uwe Kleine-König
<u.kleine-koenig@baylibre.com> wrote:
>
> The tee bus got dedicated callbacks for probe and remove.
> Make use of these. This fixes a runtime warning about the driver needing
> to be converted to the bus methods.
>
> Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
> ---

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

>  drivers/firmware/efi/stmm/tee_stmm_efi.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/firmware/efi/stmm/tee_stmm_efi.c b/drivers/firmware/efi/stmm/tee_stmm_efi.c
> index 5903811858b6..7b04dd649629 100644
> --- a/drivers/firmware/efi/stmm/tee_stmm_efi.c
> +++ b/drivers/firmware/efi/stmm/tee_stmm_efi.c
> @@ -520,8 +520,9 @@ static void tee_stmm_restore_efivars_generic_ops(void)
>         efivars_generic_ops_register();
>  }
>
> -static int tee_stmm_efi_probe(struct device *dev)
> +static int tee_stmm_efi_probe(struct tee_client_device *tee_dev)
>  {
> +       struct device *dev = &tee_dev->dev;
>         struct tee_ioctl_open_session_arg sess_arg;
>         efi_status_t ret;
>         int rc;
> @@ -571,21 +572,19 @@ static int tee_stmm_efi_probe(struct device *dev)
>         return 0;
>  }
>
> -static int tee_stmm_efi_remove(struct device *dev)
> +static void tee_stmm_efi_remove(struct tee_client_device *dev)
>  {
>         tee_stmm_restore_efivars_generic_ops();
> -
> -       return 0;
>  }
>
>  MODULE_DEVICE_TABLE(tee, tee_stmm_efi_id_table);
>
>  static struct tee_client_driver tee_stmm_efi_driver = {
>         .id_table       = tee_stmm_efi_id_table,
> +       .probe          = tee_stmm_efi_probe,
> +       .remove         = tee_stmm_efi_remove,
>         .driver         = {
>                 .name           = "tee-stmm-efi",
> -               .probe          = tee_stmm_efi_probe,
> -               .remove         = tee_stmm_efi_remove,
>         },
>  };
>
> --
> 2.47.3
>

[PATCH v2 10/17] firmware: arm_scmi: optee: Make use of module_tee_client_driver()

[Uwe Kleine-König]

Reduce boilerplate by using the newly introduced module_tee_client_driver().
That takes care of assigning the driver's bus, so the explicit assigning
in this driver can be dropped.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/firmware/arm_scmi/transports/optee.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/firmware/arm_scmi/transports/optee.c b/drivers/firmware/arm_scmi/transports/optee.c
index dc0f46340153..8fdb80d3fabd 100644
--- a/drivers/firmware/arm_scmi/transports/optee.c
+++ b/drivers/firmware/arm_scmi/transports/optee.c
@@ -612,23 +612,12 @@ static struct tee_client_driver scmi_optee_service_driver = {
 	.id_table	= scmi_optee_service_id,
 	.driver		= {
 		.name = "scmi-optee",
-		.bus = &tee_bus_type,
 		.probe = scmi_optee_service_probe,
 		.remove = scmi_optee_service_remove,
 	},
 };
 
-static int __init scmi_transport_optee_init(void)
-{
-	return driver_register(&scmi_optee_service_driver.driver);
-}
-module_init(scmi_transport_optee_init);
-
-static void __exit scmi_transport_optee_exit(void)
-{
-	driver_unregister(&scmi_optee_service_driver.driver);
-}
-module_exit(scmi_transport_optee_exit);
+module_tee_client_driver(scmi_optee_service_driver);
 
 MODULE_AUTHOR("Etienne Carriere <etienne.carriere@foss.st.com>");
 MODULE_DESCRIPTION("SCMI OPTEE Transport driver");
-- 
2.47.3

[PATCH v2 11/17] firmware: arm_scmi: Make use of tee bus methods

[Uwe Kleine-König]

The tee bus got dedicated callbacks for probe and remove.
Make use of these. This fixes a runtime warning about the driver needing
to be converted to the bus methods. Note that the return value of .remove()
was already ignored before, so there is no problem introduced by dropping
the error returns.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/firmware/arm_scmi/transports/optee.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/firmware/arm_scmi/transports/optee.c b/drivers/firmware/arm_scmi/transports/optee.c
index 8fdb80d3fabd..07ae18d5279d 100644
--- a/drivers/firmware/arm_scmi/transports/optee.c
+++ b/drivers/firmware/arm_scmi/transports/optee.c
@@ -529,8 +529,9 @@ static const struct of_device_id scmi_of_match[] = {
 DEFINE_SCMI_TRANSPORT_DRIVER(scmi_optee, scmi_optee_driver, scmi_optee_desc,
 			     scmi_of_match, core);
 
-static int scmi_optee_service_probe(struct device *dev)
+static int scmi_optee_service_probe(struct tee_client_device *scmi_pta)
 {
+	struct device *dev = &scmi_pta->dev;
 	struct scmi_optee_agent *agent;
 	struct tee_context *tee_ctx;
 	int ret;
@@ -578,24 +579,22 @@ static int scmi_optee_service_probe(struct device *dev)
 	return ret;
 }
 
-static int scmi_optee_service_remove(struct device *dev)
+static void scmi_optee_service_remove(struct tee_client_device *scmi_pta)
 {
 	struct scmi_optee_agent *agent = scmi_optee_private;
 
 	if (!scmi_optee_private)
-		return -EINVAL;
+		return;
 
 	platform_driver_unregister(&scmi_optee_driver);
 
 	if (!list_empty(&scmi_optee_private->channel_list))
-		return -EBUSY;
+		return;
 
 	/* Ensure cleared reference is visible before resources are released */
 	smp_store_mb(scmi_optee_private, NULL);
 
 	tee_client_close_context(agent->tee_ctx);
-
-	return 0;
 }
 
 static const struct tee_client_device_id scmi_optee_service_id[] = {
@@ -609,11 +608,11 @@ static const struct tee_client_device_id scmi_optee_service_id[] = {
 MODULE_DEVICE_TABLE(tee, scmi_optee_service_id);
 
 static struct tee_client_driver scmi_optee_service_driver = {
-	.id_table	= scmi_optee_service_id,
-	.driver		= {
+	.probe = scmi_optee_service_probe,
+	.remove = scmi_optee_service_remove,
+	.id_table = scmi_optee_service_id,
+	.driver = {
 		.name = "scmi-optee",
-		.probe = scmi_optee_service_probe,
-		.remove = scmi_optee_service_remove,
 	},
 };
 
-- 
2.47.3

Re: [PATCH v2 00/17] tee: Use bus callbacks instead of driver callbacks

[Jens Wiklander]

Hi,

On Mon, Dec 15, 2025 at 3:17 PM Uwe Kleine-König
<u.kleine-koenig@baylibre.com> wrote:
>
> Hello,
>
> the objective of this series is to make tee driver stop using callbacks
> in struct device_driver. These were superseded by bus methods in 2006
> (commit 594c8281f905 ("[PATCH] Add bus_type probe, remove, shutdown
> methods.")) but nobody cared to convert all subsystems accordingly.
>
> Here the tee drivers are converted. The first commit is somewhat
> unrelated, but simplifies the conversion (and the drivers). It
> introduces driver registration helpers that care about setting the bus
> and owner. (The latter is missing in all drivers, so by using these
> helpers the drivers become more correct.)
>
> v1 of this series is available at
> https://lore.kernel.org/all/cover.1765472125.git.u.kleine-koenig@baylibre.com
>
> Changes since v1:
>
>  - rebase to v6.19-rc1 (no conflicts)
>  - add tags received so far
>  - fix whitespace issues pointed out by Sumit Garg
>  - fix shutdown callback to shutdown and not remove
>
> As already noted in v1's cover letter, this series should go in during a
> single merge window as there are runtime warnings when the series is
> only applied partially. Sumit Garg suggested to apply the whole series
> via Jens Wiklander's tree.
> If this is done the dependencies in this series are honored, in case the
> plan changes: Patches #4 - #17 depend on the first two.
>
> Note this series is only build tested.
>
> Uwe Kleine-König (17):
>   tee: Add some helpers to reduce boilerplate for tee client drivers
>   tee: Add probe, remove and shutdown bus callbacks to tee_client_driver
>   tee: Adapt documentation to cover recent additions
>   hwrng: optee - Make use of module_tee_client_driver()
>   hwrng: optee - Make use of tee bus methods
>   rtc: optee: Migrate to use tee specific driver registration function
>   rtc: optee: Make use of tee bus methods
>   efi: stmm: Make use of module_tee_client_driver()
>   efi: stmm: Make use of tee bus methods
>   firmware: arm_scmi: optee: Make use of module_tee_client_driver()
>   firmware: arm_scmi: Make use of tee bus methods
>   firmware: tee_bnxt: Make use of module_tee_client_driver()
>   firmware: tee_bnxt: Make use of tee bus methods
>   KEYS: trusted: Migrate to use tee specific driver registration
>     function
>   KEYS: trusted: Make use of tee bus methods
>   tpm/tpm_ftpm_tee: Make use of tee specific driver registration
>   tpm/tpm_ftpm_tee: Make use of tee bus methods
>
>  Documentation/driver-api/tee.rst             | 18 +----
>  drivers/char/hw_random/optee-rng.c           | 26 ++----
>  drivers/char/tpm/tpm_ftpm_tee.c              | 31 +++++---
>  drivers/firmware/arm_scmi/transports/optee.c | 32 +++-----
>  drivers/firmware/broadcom/tee_bnxt_fw.c      | 30 ++-----
>  drivers/firmware/efi/stmm/tee_stmm_efi.c     | 25 ++----
>  drivers/rtc/rtc-optee.c                      | 27 ++-----
>  drivers/tee/tee_core.c                       | 84 ++++++++++++++++++++
>  include/linux/tee_drv.h                      | 12 +++
>  security/keys/trusted-keys/trusted_tee.c     | 17 ++--
>  10 files changed, 164 insertions(+), 138 deletions(-)
>
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> --
> 2.47.3
>

Thank you for the nice cleanup, Uwe.

I've applied patch 1-3 to the branch tee_bus_callback_for_6.20 in my
tree at https://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git/

The branch is based on v6.19-rc1, and I'll try to keep it stable for
others to depend on, if needed. Let's see if we can agree on taking
the remaining patches via that branch.

Cheers,
Jens

Re: [PATCH v2 00/17] tee: Use bus callbacks instead of driver callbacks

[Alexandre Belloni]

On 18/12/2025 08:21:27+0100, Jens Wiklander wrote:
> Hi,
> 
> On Mon, Dec 15, 2025 at 3:17 PM Uwe Kleine-König
> <u.kleine-koenig@baylibre.com> wrote:
> >
> > Hello,
> >
> > the objective of this series is to make tee driver stop using callbacks
> > in struct device_driver. These were superseded by bus methods in 2006
> > (commit 594c8281f905 ("[PATCH] Add bus_type probe, remove, shutdown
> > methods.")) but nobody cared to convert all subsystems accordingly.
> >
> > Here the tee drivers are converted. The first commit is somewhat
> > unrelated, but simplifies the conversion (and the drivers). It
> > introduces driver registration helpers that care about setting the bus
> > and owner. (The latter is missing in all drivers, so by using these
> > helpers the drivers become more correct.)
> >
> > v1 of this series is available at
> > https://lore.kernel.org/all/cover.1765472125.git.u.kleine-koenig@baylibre.com
> >
> > Changes since v1:
> >
> >  - rebase to v6.19-rc1 (no conflicts)
> >  - add tags received so far
> >  - fix whitespace issues pointed out by Sumit Garg
> >  - fix shutdown callback to shutdown and not remove
> >
> > As already noted in v1's cover letter, this series should go in during a
> > single merge window as there are runtime warnings when the series is
> > only applied partially. Sumit Garg suggested to apply the whole series
> > via Jens Wiklander's tree.
> > If this is done the dependencies in this series are honored, in case the
> > plan changes: Patches #4 - #17 depend on the first two.
> >
> > Note this series is only build tested.
> >
> > Uwe Kleine-König (17):
> >   tee: Add some helpers to reduce boilerplate for tee client drivers
> >   tee: Add probe, remove and shutdown bus callbacks to tee_client_driver
> >   tee: Adapt documentation to cover recent additions
> >   hwrng: optee - Make use of module_tee_client_driver()
> >   hwrng: optee - Make use of tee bus methods
> >   rtc: optee: Migrate to use tee specific driver registration function
> >   rtc: optee: Make use of tee bus methods
> >   efi: stmm: Make use of module_tee_client_driver()
> >   efi: stmm: Make use of tee bus methods
> >   firmware: arm_scmi: optee: Make use of module_tee_client_driver()
> >   firmware: arm_scmi: Make use of tee bus methods
> >   firmware: tee_bnxt: Make use of module_tee_client_driver()
> >   firmware: tee_bnxt: Make use of tee bus methods
> >   KEYS: trusted: Migrate to use tee specific driver registration
> >     function
> >   KEYS: trusted: Make use of tee bus methods
> >   tpm/tpm_ftpm_tee: Make use of tee specific driver registration
> >   tpm/tpm_ftpm_tee: Make use of tee bus methods
> >
> >  Documentation/driver-api/tee.rst             | 18 +----
> >  drivers/char/hw_random/optee-rng.c           | 26 ++----
> >  drivers/char/tpm/tpm_ftpm_tee.c              | 31 +++++---
> >  drivers/firmware/arm_scmi/transports/optee.c | 32 +++-----
> >  drivers/firmware/broadcom/tee_bnxt_fw.c      | 30 ++-----
> >  drivers/firmware/efi/stmm/tee_stmm_efi.c     | 25 ++----
> >  drivers/rtc/rtc-optee.c                      | 27 ++-----
> >  drivers/tee/tee_core.c                       | 84 ++++++++++++++++++++
> >  include/linux/tee_drv.h                      | 12 +++
> >  security/keys/trusted-keys/trusted_tee.c     | 17 ++--
> >  10 files changed, 164 insertions(+), 138 deletions(-)
> >
> > base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> > --
> > 2.47.3
> >
> 
> Thank you for the nice cleanup, Uwe.
> 
> I've applied patch 1-3 to the branch tee_bus_callback_for_6.20 in my
> tree at https://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git/
> 
> The branch is based on v6.19-rc1, and I'll try to keep it stable for
> others to depend on, if needed. Let's see if we can agree on taking
> the remaining patches via that branch.

6 and 7 can go through your branch.

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v2 00/17] tee: Use bus callbacks instead of driver callbacks

[Jens Wiklander]

On Thu, Dec 18, 2025 at 2:53 PM Alexandre Belloni
<alexandre.belloni@bootlin.com> wrote:
>
> On 18/12/2025 08:21:27+0100, Jens Wiklander wrote:
> > Hi,
> >
> > On Mon, Dec 15, 2025 at 3:17 PM Uwe Kleine-König
> > <u.kleine-koenig@baylibre.com> wrote:
> > >
> > > Hello,
> > >
> > > the objective of this series is to make tee driver stop using callbacks
> > > in struct device_driver. These were superseded by bus methods in 2006
> > > (commit 594c8281f905 ("[PATCH] Add bus_type probe, remove, shutdown
> > > methods.")) but nobody cared to convert all subsystems accordingly.
> > >
> > > Here the tee drivers are converted. The first commit is somewhat
> > > unrelated, but simplifies the conversion (and the drivers). It
> > > introduces driver registration helpers that care about setting the bus
> > > and owner. (The latter is missing in all drivers, so by using these
> > > helpers the drivers become more correct.)
> > >
> > > v1 of this series is available at
> > > https://lore.kernel.org/all/cover.1765472125.git.u.kleine-koenig@baylibre.com
> > >
> > > Changes since v1:
> > >
> > >  - rebase to v6.19-rc1 (no conflicts)
> > >  - add tags received so far
> > >  - fix whitespace issues pointed out by Sumit Garg
> > >  - fix shutdown callback to shutdown and not remove
> > >
> > > As already noted in v1's cover letter, this series should go in during a
> > > single merge window as there are runtime warnings when the series is
> > > only applied partially. Sumit Garg suggested to apply the whole series
> > > via Jens Wiklander's tree.
> > > If this is done the dependencies in this series are honored, in case the
> > > plan changes: Patches #4 - #17 depend on the first two.
> > >
> > > Note this series is only build tested.
> > >
> > > Uwe Kleine-König (17):
> > >   tee: Add some helpers to reduce boilerplate for tee client drivers
> > >   tee: Add probe, remove and shutdown bus callbacks to tee_client_driver
> > >   tee: Adapt documentation to cover recent additions
> > >   hwrng: optee - Make use of module_tee_client_driver()
> > >   hwrng: optee - Make use of tee bus methods
> > >   rtc: optee: Migrate to use tee specific driver registration function
> > >   rtc: optee: Make use of tee bus methods
> > >   efi: stmm: Make use of module_tee_client_driver()
> > >   efi: stmm: Make use of tee bus methods
> > >   firmware: arm_scmi: optee: Make use of module_tee_client_driver()
> > >   firmware: arm_scmi: Make use of tee bus methods
> > >   firmware: tee_bnxt: Make use of module_tee_client_driver()
> > >   firmware: tee_bnxt: Make use of tee bus methods
> > >   KEYS: trusted: Migrate to use tee specific driver registration
> > >     function
> > >   KEYS: trusted: Make use of tee bus methods
> > >   tpm/tpm_ftpm_tee: Make use of tee specific driver registration
> > >   tpm/tpm_ftpm_tee: Make use of tee bus methods
> > >
> > >  Documentation/driver-api/tee.rst             | 18 +----
> > >  drivers/char/hw_random/optee-rng.c           | 26 ++----
> > >  drivers/char/tpm/tpm_ftpm_tee.c              | 31 +++++---
> > >  drivers/firmware/arm_scmi/transports/optee.c | 32 +++-----
> > >  drivers/firmware/broadcom/tee_bnxt_fw.c      | 30 ++-----
> > >  drivers/firmware/efi/stmm/tee_stmm_efi.c     | 25 ++----
> > >  drivers/rtc/rtc-optee.c                      | 27 ++-----
> > >  drivers/tee/tee_core.c                       | 84 ++++++++++++++++++++
> > >  include/linux/tee_drv.h                      | 12 +++
> > >  security/keys/trusted-keys/trusted_tee.c     | 17 ++--
> > >  10 files changed, 164 insertions(+), 138 deletions(-)
> > >
> > > base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> > > --
> > > 2.47.3
> > >
> >
> > Thank you for the nice cleanup, Uwe.
> >
> > I've applied patch 1-3 to the branch tee_bus_callback_for_6.20 in my
> > tree at https://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git/
> >
> > The branch is based on v6.19-rc1, and I'll try to keep it stable for
> > others to depend on, if needed. Let's see if we can agree on taking
> > the remaining patches via that branch.
>
> 6 and 7 can go through your branch.

Good, I've added them to my branch now.

Thanks,
Jens