Here is the promised refactoring of the reset core. The main goal of the
series is to make the reset subsystem fwnode-agnostic - meaning it can
work with all kinds of firmware nodes instead of being OF-centric - but
there are some other related changes in here as well. I'm sending it all
out for review to give Phillipp a better picture of the end result but
individual pieces can be picked up earlier if accepted.
The series is logically split into several parts:
Patches 1-5: Several reset-gpio improvements. Most are not very
controversial but I included a reworked version of the patch adding a
firmware device link between the auxiliary reset device and its
consumers.
Patches 6-7: Just general improvements.
Patch 8: Before we support all firmware nodes (even software nodes for
which no devlinks are created) we need to make sure reset drivers can
survive a sudden unbinding of the supplier with consumers still holding
references to the controller. This patch addresses it using SRCU.
Patches 9,10: Rework locking in reset core. Make locking fine-grained
instead of using a single global lock for everything.
Patches 11-14: Make reset core use fwnode as primary source of
device properties and references. Convert reset-gpio to becoming the
first fwnode-agnostic driver.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
Changes in v2:
- fix lock guard usage
- tweak commit messages
- fix potential NULL-pointer dereference
- drop unneeded patch (squash it into another one)
- collect tags
- rebase on top of v7.0-rc1
- Link to v1: https://lore.kernel.org/r/20260105-reset-core-refactor-v1-0-ac443103498d@oss.qualcomm.com
---
Bartosz Golaszewski (14):
reset: gpio: remove unneeded OF-node put
reset: gpio: add a devlink between reset-gpio and its consumer
reset: gpio: simplify fallback device matching
reset: gpio: remove unneeded auxiliary_set_drvdata()
reset: warn on reset-gpio release
reset: fold ida_alloc() into reset_create_gpio_aux_device()
reset: use lock guards in reset core
reset: handle removing supplier before consumers
reset: protect struct reset_controller_dev with its own mutex
reset: protect struct reset_control with its own mutex
reset: convert of_reset_control_get_count() to using firmware nodes
reset: convert the core API to using firmware nodes
reset: convert reset core to using firmware nodes
reset: gpio: make the driver fwnode-agnostic
drivers/reset/core.c | 477 +++++++++++++++++++++++++--------------
drivers/reset/reset-gpio.c | 27 +--
include/linux/reset-controller.h | 21 +-
include/linux/reset.h | 43 ++--
4 files changed, 359 insertions(+), 209 deletions(-)
---
base-commit: c7c0b164c6629319df9172556b97795b591411f6
change-id: 20251222-reset-core-refactor-5fad7197cbcf
Best regards,
--
Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>