[PATCH 00/23] driver core: count references of the platform device's fwnode, not OF node

[Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>]

I'd like to first apologize for the long, treewide series and an
extensive Cc list but I think it's important to show the big picture and
the end result of this rework.

Platform device core provides helper interfaces for dealing with
dynamically created platform devices. Most users should use
platform_device_register_full() which encapsulates most of the
operations but some modules will want to use the split approach of
calling platform_device_alloc() + platform_device_add() separately for
various reasons.

With many platform devices now using dynamic software nodes as their
primary firmware nodes and with the platform device interface being
extended to also better cover the use-cases of secondary software nodes,
I believe it makes sense to switch to counting the references of all
kinds of firmware nodes.

To that end, I identified all users of platform_device_alloc() that also
assign dev.of_node or dev.fwnode manually. I noticed five cases where
the references are not increased as they should (patches 1-5 fix these
users) and provided three new functions in platform_device.h that now
become the preferred interfaces for assigning firmware nodes to dynamic
platform devices (in line with platform_device_add_data(),
platform_device_add_resources(), etc.). The bulk of the patches in this
series are small driver conversions to port all users to going through
the new functions that now encapsulate the refcount logic. With that
done, the final patch seamlessly switches to counting the references of
all firmware node types.

This effort is prerequisite of removing platform_device_release_full()
and unifying the release path for dynamic platform devices using
unmanaged software nodes.

Merging strategy: First tree patches should go directly into individual
maintainers' trees and land in v7.1 and stable as bug fixes. The
remaining patches touch lots of drivers but the changes are minimal and
unlikely to cause any conflicts. I believe they should be queued in the
driver core tree for v7.2 (possibly on an immutable branch for others to
merge into their trees). If the subsystem maintainers object, the
alternative is to queue the three new helpers for platform devices via
the driver core tree. After v7.2-rc1, I'd resend individual driver
patches to appropriate maintainers and once they're upstream, we can
apply the final platform device change. However this would take three
cycles to complete so my preference is the former solution.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
Bartosz Golaszewski (23):
      mfd: tps6586x: fix OF node refcount
      net: mv643xx: fix OF node refcount
      slimbus: qcom-ngd-ctrl: fix OF node refcount
      pmdomain: imx: fix OF node refcount
      powerpc/powermac: fix OF node refcount
      driver core: platform: provide platform_device_set_of_node()
      driver core: platform: provide platform_device_set_fwnode()
      driver core: platform: provide platform_device_set_of_node_from_dev()
      of: platform: use platform_device_set_of_node()
      powerpc/powermac: use platform_device_set_of_node()
      i2c: pxa-pci: use platform_device_set_of_node()
      iommu/fsl: use platform_device_set_of_node()
      net: bcmgenet: use platform_device_set_of_node()
      pmdomain: imx: use platform_device_set_of_node()
      mfd: tps6586: use platform_device_set_of_node()
      slimbus: qcom-ngd-ctrl: use platform_device_set_of_node()
      net: mv643xx: use platform_device_set_of_node()
      drm/xe/i2c: use platform_device_set_fwnode()
      platform/surface: gpe: use platform_device_set_fwnode()
      usb: chipidea: use platform_device_set_of_node_from_dev()
      usb: musb: use platform_device_set_of_node_from_dev()
      reset: rzg2l: use platform_device_set_of_node_from_dev()
      driver core: platform: count references to all kinds of firmware nodes

 arch/powerpc/platforms/powermac/low_i2c.c    |  2 +-
 drivers/base/platform.c                      | 56 ++++++++++++++++++++++++++--
 drivers/gpu/drm/xe/xe_i2c.c                  |  2 +-
 drivers/i2c/busses/i2c-pxa-pci.c             |  3 +-
 drivers/iommu/fsl_pamu.c                     |  7 ++--
 drivers/mfd/tps6586x.c                       |  2 +-
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 10 +++--
 drivers/net/ethernet/marvell/mv643xx_eth.c   |  2 +-
 drivers/of/platform.c                        |  2 +-
 drivers/platform/surface/surface_gpe.c       |  2 +-
 drivers/pmdomain/imx/gpc.c                   |  3 +-
 drivers/reset/reset-rzg2l-usbphy-ctrl.c      |  2 +-
 drivers/slimbus/qcom-ngd-ctrl.c              |  2 +-
 drivers/usb/chipidea/core.c                  |  2 +-
 drivers/usb/musb/jz4740.c                    |  2 +-
 include/linux/platform_device.h              |  8 ++++
 16 files changed, 84 insertions(+), 23 deletions(-)
---
base-commit: 687da68900cd1a46549f7d9430c7d40346cb86a0
change-id: 20260520-pdev-fwnode-ref-d867836971eb

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>