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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: The entire series should go through the driver core tree, possibly with an immutable branch provided to solve any potential conflicts though these are rather unlikely. Signed-off-by: Bartosz Golaszewski --- Changes in v3: - Use device_set_node() where applicable - Use __free(device_node) in fsl iommu driver - Don't use __free() where not really required - Add a patch updating the kerneldoc for platform_device_alloc() - Collect more tags - Link to v2: https://patch.msgid.link/20260629-pdev-fwnode-ref-v2-0-8abe2513f96e@oss.qualcomm.com Changes in v2: - Rebased on top of v7.2-rc1, dropped applied patches, collected tags - Link to v1: https://patch.msgid.link/20260521-pdev-fwnode-ref-v1-0-88c324a1b8d2@oss.qualcomm.com --- Bartosz Golaszewski (20): 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() driver core: update kerneldoc for platform_device_alloc() 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 | 61 ++++++++++++++++++++++++++-- drivers/gpu/drm/xe/xe_i2c.c | 2 +- drivers/i2c/busses/i2c-pxa-pci.c | 3 +- drivers/iommu/fsl_pamu.c | 16 +++----- drivers/mfd/tps6586x.c | 2 +- drivers/net/ethernet/broadcom/genet/bcmmii.c | 3 +- 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 | 9 ++++ 16 files changed, 88 insertions(+), 27 deletions(-) --- base-commit: 8cdeaa50eae8dad34885515f62559ee83e7e8dda change-id: 20260520-pdev-fwnode-ref-d867836971eb Best regards, -- Bartosz Golaszewski