mbox series

[v4,00/15] hwspinlock: move device alloc into core and refactor includes

Message ID 20260310075539.11701-1-wsa+renesas@sang-engineering.com (mailing list archive)
Headers
Series hwspinlock: move device alloc into core and refactor includes |

Message

Wolfram Sang March 10, 2026, 7:55 a.m. UTC 
Changes since v3:

* removed useless __iomem annotations (Thanks, sparse + buildbots)
  So, the newly introduced callback only operates on void* and doesn't
  use __iomem annotations now. Note that most of the drivers will still
  trigger a sparse warning because they use an __iomem pointer in
  .con_priv. But they also did so before this series, so it keeps
  current behaviour. Fixing these sparse warnings should be done
  independently IMO.
* rebased to 7.0-rc3
* added tags (Thanks!)

My ultimate goal is to allow hwspinlock provider drivers outside of the
subsystem directory. It turned out that a simple split of the headers
files into a public provider and a public consumer header file is not
enough because core internal structures need to stay hidden. Even more,
their opaqueness could and should even be increased. That would also
allow the core to handle the de-/allocation of the hwspinlock device
itself.

This series does all that. Patches 1-2 remove the meanwhile unused
platform_data to ease further refactoring. Patches 3-9 abstract access
to internal structures away using helpers. Patch 10 then moves
hwspinlock device handling to the core, simplifying drivers. The
remaining patches refactor the headers until the internal one is gone
and the public ones are divided into provider and consumer parts. More
details are given in the patch descriptions.

One note about using a callback to initialize hwspinlock priv: I also
experimented with a dedicated 'set_priv' helper function. It felt a bit
clumsy to me. Drivers would need to save the 'bank' pointer again and
iterate over it. Because most drivers will only have a simple callback
anyhow, it looked leaner to me.

This series has been tested on a Renesas SparrowHawk board (R-Car V4H)
with a yet-to-be-upstreamed hwspinlock driver for the MFIS IP core. A
branch can be found here (without the MFIS driver currently):

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/hwspinlock/refactor-alloc-buildtest

Happy hacking,

   Wolfram


Wolfram Sang (15):
  hwspinlock: u8500: delete driver
  hwspinlock: remove now unused pdata from header file
  hwspinlock: add helpers to retrieve core data
  hwspinlock: add callback to fill private data of a hwspinlock
  hwspinlock: omap: use new callback to initialize hwspinlock priv
  hwspinlock: qcom: use new callback to initialize hwspinlock priv
  hwspinlock: sprd: use new callback to initialize hwspinlock priv
  hwspinlock: stm32: use new callback to initialize hwspinlock priv
  hwspinlock: sun6i: use new callback to initialize hwspinlock priv
  hwspinlock: handle hwspinlock device allocation in the core
  hwspinlock: move entries from internal to public header
  hwspinlock: remove internal header
  hwspinlock: sort include and update copyright
  hwspinlock: refactor provider.h from public header
  hwspinlock/treewide: refactor consumer.h from public header

 Documentation/locking/hwspinlock.rst          |   2 +-
 MAINTAINERS                                   |   3 +-
 drivers/base/regmap/regmap.c                  |   2 +-
 drivers/hwspinlock/Kconfig                    |  10 --
 drivers/hwspinlock/Makefile                   |   1 -
 drivers/hwspinlock/hwspinlock_core.c          | 129 +++++++++++----
 drivers/hwspinlock/hwspinlock_internal.h      |  72 --------
 drivers/hwspinlock/omap_hwspinlock.c          |  27 ++-
 drivers/hwspinlock/qcom_hwspinlock.c          |  69 ++++----
 drivers/hwspinlock/sprd_hwspinlock.c          |  39 ++---
 drivers/hwspinlock/stm32_hwspinlock.c         |  26 +--
 drivers/hwspinlock/sun6i_hwspinlock.c         |  36 ++--
 drivers/hwspinlock/u8500_hsem.c               | 155 ------------------
 drivers/iio/adc/sc27xx_adc.c                  |   2 +-
 drivers/irqchip/irq-stm32mp-exti.c            |   2 +-
 drivers/mfd/syscon.c                          |   2 +-
 drivers/nvmem/sc27xx-efuse.c                  |   2 +-
 drivers/nvmem/sprd-efuse.c                    |   2 +-
 drivers/pinctrl/stm32/pinctrl-stm32.c         |   2 +-
 drivers/soc/qcom/smem.c                       |   2 +-
 drivers/spi/spi-sprd-adi.c                    |   2 +-
 .../{hwspinlock.h => hwspinlock/consumer.h}   |  57 +------
 include/linux/hwspinlock/provider.h           |  60 +++++++
 23 files changed, 260 insertions(+), 444 deletions(-)
 delete mode 100644 drivers/hwspinlock/hwspinlock_internal.h
 delete mode 100644 drivers/hwspinlock/u8500_hsem.c
 rename include/linux/{hwspinlock.h => hwspinlock/consumer.h} (87%)
 create mode 100644 include/linux/hwspinlock/provider.h