[PATCH v4 0/2] irq/irq_sim: try to improve the API

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

The interrupt simulator API exposes a lot of custom data structures and
functions and doesn't reuse the interfaces already exposed by the irq
subsystem. This series tries to address it.

First, we make irq_domain_reset_irq_data() available to non-V2 domain API
users - that'll be used in the subsequent patch. Next we overhaul the
public interfaces - we hide all specific data structures and instead
rely on the irq_domain struct and virtual interrupt numberspace.

The end effect is that we limit the interrupt simulator API to three
functions (plus one device managed variant) and zero new structures.

v1: https://lkml.org/lkml/2019/8/12/558

v1 -> v2:
- instead of just making the new data structures opaque for users, remove
  them entirely in favor of irq_domain
- call irq_set_handler() & irq_domain_reset_irq_data() when unmapping
  the simulated interrupt
- fix a memory leak in error path
- make it possible to use irq_find_matching_fwnode() with the simulator
  domain
- correctly use irq_create_mapping() and irq_find_mapping(): only use the
  former at init-time and the latter at interrupt-time

v2 -> v3:
- drop the controverial changes to irq_domain code and only leave the
  changes to irq_sim and its users with the plan to revisit the former
  at a later time

v3 -> v4:
- add the Ack from Jonathan
- remove redundant parts of patch 1/2

Bartosz Golaszewski (2):
  irq: make irq_domain_reset_irq_data() available even for non-V2 users
  irq/irq_sim: simplify the API

 drivers/gpio/gpio-mockup.c          |  47 ++++--
 drivers/iio/dummy/iio_dummy_evgen.c |  32 ++--
 include/linux/irq_sim.h             |  34 ++---
 include/linux/irqdomain.h           |   2 +-
 kernel/irq/Kconfig                  |   1 +
 kernel/irq/irq_sim.c                | 225 +++++++++++++++++-----------
 kernel/irq/irqdomain.c              |  24 +--
 7 files changed, 215 insertions(+), 150 deletions(-)

-- 
2.25.0