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

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Message-ID: <cover.1765791463.git.u.kleine-koenig@baylibre.com>
Date: Mon, 15 Dec 2025 15:16:30 +0100
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Jens Wiklander <jens.wiklander@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	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>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Rafał Miłecki <zajec5@...il.com>,
	Michael Chan <michael.chan@...adcom.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.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-doc@...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,
	linux-mips@...r.kernel.org,
	netdev@...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 v2 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 These were superseded by bus methods in 2006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.)

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