linux.git/include/linux/reset-controller.h, branch v7.1-rc3

reset: convert reset core to using firmware nodes

2026-03-09T09:20:04+00:00

With everything else now in place, we can convert the remaining parts of
the reset subsystem to becoming fwnode-agnostic - meaning it will work
with all kinds of firmware nodes, not only devicetree.

To that end: extend struct reset_controller_dev with fields taking
information relevant for using firmware nodes (which mirrors what we
already do for OF-nodes) and limit using of_ APIs only to where it's
absolutely necessary (mostly around the of_xlate callback).

For backward compatibility of existing drivers we still support OF-nodes
but firmware nodes become the preferred method.

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Philipp Zabel 
Signed-off-by: Philipp Zabel

reset: protect struct reset_controller_dev with its own mutex

2026-03-09T09:20:04+00:00

Currently we use a single, global mutex - misleadingly names
reset_list_mutex - to protect the global list of reset devices,
per-controller list of reset control handles and also internal fields of
struct reset_control. Locking can be made a lot more fine-grained if we
use a separate mutex for serializing operations on the list AND
accessing the reset controller device.

Signed-off-by: Bartosz Golaszewski 
Reviewed-by: Philipp Zabel 
Signed-off-by: Philipp Zabel

reset: gpio: simplify fallback device matching

2026-03-09T09:17:50+00:00

The of_args field of struct reset_controller_dev was introduced to allow
the reset-gpio driver to pass the phandle arguments back to reset core.
The thing is: it doesn't even have to do it. The core sets the platform
data of the auxiliary device *AND* has access to it later on during the
lookup. This means the field is unneeded and all can happen entirely in
reset core.

Remove the field from the public header and don't set it in
reset-gpio.c. Retrieve the platform data in reset core when needed
instead.

Reviewed-by: Philipp Zabel 
Signed-off-by: Bartosz Golaszewski 
Signed-off-by: Philipp Zabel

reset: remove legacy reset lookup code

2025-11-18T16:52:54+00:00

There are no more users of this code. Let's remove the exported symbols
and the implementation from reset core.

Reviewed-by: Philipp Zabel 
Signed-off-by: Bartosz Golaszewski 
[p.zabel@pengutronix.de: folded in 8e6ec20e-8965-4b42-99fc-0462269ff2f1@paulmck-laptop]
Signed-off-by: Philipp Zabel

reset: Instantiate reset GPIO controller for shared reset-gpios

2024-02-21T10:53:25+00:00

Devices sharing a reset GPIO could use the reset framework for
coordinated handling of that shared GPIO line.  We have several cases of
such needs, at least for Devicetree-based platforms.

If Devicetree-based device requests a reset line, while "resets"
Devicetree property is missing but there is a "reset-gpios" one,
instantiate a new "reset-gpio" platform device which will handle such
reset line.  This allows seamless handling of such shared reset-gpios
without need of changing Devicetree binding [1].

To avoid creating multiple "reset-gpio" platform devices, store the
Devicetree "reset-gpios" GPIO specifiers used for new devices on a
linked list.  Later such Devicetree GPIO specifier (phandle to GPIO
controller, GPIO number and GPIO flags) is used to check if reset
controller for given GPIO was already registered.

If two devices have conflicting "reset-gpios" property, e.g. with
different ACTIVE_xxx flags, this would allow to spawn two separate
"reset-gpio" devices, where the second would fail probing on busy GPIO
request.

Link: https://lore.kernel.org/all/YXi5CUCEi7YmNxXM@robh.at.kernel.org/ [1]
Cc: Bartosz Golaszewski 
Cc: Chris Packham 
Cc: Sean Anderson 
Reviewed-by: Philipp Zabel 
Signed-off-by: Krzysztof Kozlowski 
Acked-by: Bartosz Golaszewski 
Acked-by: Linus Walleij 
Link: https://lore.kernel.org/r/20240129115216.96479-5-krzysztof.kozlowski@linaro.org
Signed-off-by: Philipp Zabel

reset: Add compile-test stubs

2021-06-09T11:37:16+00:00

Add stubs for the reset controller registration functions to allow
building reset controller provider drivers with the COMPILE_TEST
Kconfig option enabled.

Reported-by: Krzysztof Kozlowski 
Suggested-by: Dmitry Osipenko 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20210609112806.3565057-3-thierry.reding@gmail.com
Signed-off-by: Philipp Zabel

Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

2019-12-05T19:43:31+00:00

Pull ARM SoC driver updates from Olof Johansson:
 "Various driver updates for platforms:

   - A larger set of work on Tegra 2/3 around memory controller and
     regulator features, some fuse cleanups, etc..

   - MMP platform drivers, in particular for USB PHY, and other smaller
     additions.

   - Samsung Exynos 5422 driver for DMC (dynamic memory configuration),
     and ASV (adaptive voltage), allowing the platform to run at more
     optimal operating points.

   - Misc refactorings and support for RZ/G2N and R8A774B1 from Renesas

   - Clock/reset control driver for TI/OMAP

   - Meson-A1 reset controller support

   - Qualcomm sdm845 and sda845 SoC IDs for socinfo"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (150 commits)
  firmware: arm_scmi: Fix doorbell ring logic for !CONFIG_64BIT
  soc: fsl: add RCPM driver
  dt-bindings: fsl: rcpm: Add 'little-endian' and update Chassis definition
  memory: tegra: Consolidate registers definition into common header
  memory: tegra: Ensure timing control debug features are disabled
  memory: tegra: Introduce Tegra30 EMC driver
  memory: tegra: Do not handle error from wait_for_completion_timeout()
  memory: tegra: Increase handshake timeout on Tegra20
  memory: tegra: Print a brief info message about EMC timings
  memory: tegra: Pre-configure debug register on Tegra20
  memory: tegra: Include io.h instead of iopoll.h
  memory: tegra: Adapt for Tegra20 clock driver changes
  memory: tegra: Don't set EMC rate to maximum on probe for Tegra20
  memory: tegra: Add gr2d and gr3d to DRM IOMMU group
  memory: tegra: Set DMA mask based on supported address bits
  soc: at91: Add Atmel SFR SN (Serial Number) support
  memory: atmel-ebi: switch to SPDX license identifiers
  memory: atmel-ebi: move NUM_CS definition inside EBI driver
  soc: mediatek: Refactor bus protection control
  soc: mediatek: Refactor sram control
  ...

reset: fix reset_control_ops kerneldoc comment

2019-10-28T11:18:23+00:00

Add a missing short description to the reset_control_ops documentation.

Signed-off-by: Randy Dunlap 
[p.zabel@pengutronix.de: rebased and updated commit message]
Signed-off-by: Philipp Zabel

reset: improve of_xlate documentation

2019-10-24T08:50:25+00:00

Mention of_reset_simple_xlate as the default if of_xlate is not set.

Signed-off-by: Philipp Zabel

reset: fix reset_control_lookup kerneldoc comment

2019-10-24T08:26:33+00:00

Add a missing colon to fix a documentation build warning:

  ./include/linux/reset-controller.h:45: warning: Function parameter or member 'con_id' not described in 'reset_control_lookup'

Fixes: 6691dffab0ab ("reset: add support for non-DT systems")
Signed-off-by: Philipp Zabel