linux-kernel - [PATCH v1 00/17] tee: Use bus callbacks instead of driver callbacks

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Message-ID: <cover.1765472125.git.u.kleine-koenig@baylibre.com>
Date: Thu, 11 Dec 2025 18:14:54 +0100
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Jens Wiklander <jens.wiklander@...aro.org>,
	Sumit Garg <sumit.garg@...nel.org>,
	Olivia Mackall <olivia@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Clément Léger <clement.leger@...tlin.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Sumit Garg <sumit.garg@....qualcomm.com>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Michael Chan <michael.chan@...adcom.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Rafał Miłecki <zajec5@...il.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Mimi Zohar <zohar@...ux.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Peter Huewe <peterhuewe@....de>
Cc: op-tee@...ts.trustedfirmware.org,
	linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	linux-rtc@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	Cristian Marussi <cristian.marussi@....com>,
	arm-scmi@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-integrity@...r.kernel.org,
	keyrings@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH v1 00/17] tee: Use bus callbacks instead of driver callbacks

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 These were superseded by bus methods in 2006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.)

The patches #4 - #17 depend on the first two, so if they should be
applied to their respective subsystem trees these must contain the first
two patches first.

Note that after patch #2 is applied, unconverted drivers provoke a
warning in driver_register(), so it would be good for the user
experience if the whole series goes in during a single merge window. So
I guess an immutable branch containing the frist three patches that can
be merged into the other subsystem trees would be sensible.

After all patches are applied, tee_bus_type can be made private to
drivers/tee as it's not used in other places any more.

Best regards
Uwe

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: 7d0a66e4bb9081d75c82ec4957c50034cb0ea449
-- 
2.47.3