kernel/linux.git/drivers/i3c, branch v7.2-rc1

i3c: mipi-i3c-hci: Use named initializers for platform_device_id's .driver_data

2026-06-16T21:19:45+00:00

The assignment in this driver uses a mixed way to initialize the platform_device_id array. .name is assigned by name and .driver_data by position. Unify that to use named assignment for both struct members. This is needed for a planned change to struct platform_device_id replacing .driver_data by an anonymous union. Signed-off-by: Uwe Kleine-König (The Capable Hub) Reviewed-by: Frank Li Reviewed-by: Adrian Hunter Link: https://patch.msgid.link/7c006616f72748fb4deccd197ca2b6427c006f79.1781620397.git.ukleinek@kernel.org Signed-off-by: Alexandre Belloni

i3c: master: Use unsigned int for dev_nack_retry_count consistently

2026-06-16T21:19:19+00:00

Use unsigned int for dev_nack_retry_count across the core and controller drivers to match the type of master->dev_nack_retry_count. Update the sysfs store path to use kstrtouint() and adjust the ->set_dev_nack_retry() callback prototype and callers accordingly. Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260616113752.196140-4-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni

i3c: master: Add missing runtime PM get in dev_nack_retry_count_store()

2026-06-16T21:19:19+00:00

Ensure the device is runtime resumed while updating the retry configuration to avoid accessing the controller while suspended. Call i3c_master_rpm_get() before accessing the controller in dev_nack_retry_count_store() and release it with i3c_master_rpm_put() afterwards. Fixes: 990c149c61ee4 ("i3c: master: Introduce optional Runtime PM support") Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260616113752.196140-3-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni

i3c: master: Update dev_nack_retry_count under maintenance lock

2026-06-16T21:19:19+00:00

Protect master->dev_nack_retry_count against concurrent sysfs updates by updating it while holding the bus maintenance lock. Consequently, combine adjacent return statements into one. For consistency, read dev_nack_retry_count while holding the bus normaluse lock. Fixes: b58f47eb39268 ("i3c: add sysfs entry and attribute for Device NACK Retry count") Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260616113752.196140-2-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni

i3c: master: Expose the APIs to support I3C hub

2026-06-15T23:27:25+00:00

Change the below internal static functions to APIs to allow new I3C hub driver to use them 1) i3c_dev_enable_ibi_locked() 2) i3c_dev_disable_ibi_locked() 3) i3c_dev_request_ibi_locked() 4) i3c_dev_free_ibi_locked() 5) i3c_master_reattach_i3c_dev_locked() Signed-off-by: Aman Kumar Pandey Signed-off-by: Lakshay Piplani Reviewed-by: Frank Li Link: https://patch.msgid.link/20260612111816.3688240-3-lakshay.piplani@nxp.com Signed-off-by: Alexandre Belloni

i3c: master: rename i3c_master_reattach_i3c_dev() to *_locked

2026-06-15T23:27:24+00:00

Rename i3c_master_reattach_i3c_dev() to *_locked() to make the locking requirement explicit and consistent with other I3C core helpers that require the bus lock to be held by the caller. Signed-off-by: Lakshay Piplani Reviewed-by: Frank Li Link: https://patch.msgid.link/20260612111816.3688240-2-lakshay.piplani@nxp.com Signed-off-by: Alexandre Belloni

i3c: mipi-i3c-hci: add microchip sama7d65 SoC compatible with the required quirk

2026-06-14T20:38:43+00:00

Add support for microchip sama7d65 SoC I3C HCI master only IP with additional clock support to enable bulk clock acquisition and apply the required quirks. Reviewed-by: Adrian Hunter Signed-off-by: Manikandan Muralidharan Reviewed-by: Frank Li Link: https://patch.msgid.link/20260525092405.1514213-4-manikandan.m@microchip.com Signed-off-by: Alexandre Belloni

i3c: Consistently define pci_device_ids using named initializers

2026-06-14T20:25:44+00:00

The .driver_data member of the various struct pci_device_id arrays were initialized by list expressions. This isn't easily readable if you're not into PCI. Using named initializers is more explicit and thus easier to parse. This change doesn't introduce changes to the compiled pci_device_id arrays. Tested on x86 and arm64. Signed-off-by: Uwe Kleine-König (The Capable Hub) Reviewed-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260504143324.2122737-2-u.kleine-koenig@baylibre.com Signed-off-by: Alexandre Belloni

i3c: master: Reconcile dynamic addresses after DAA

2026-06-14T19:49:11+00:00

After Dynamic Address Assignment (DAA), there may be cases where devices have been assigned dynamic addresses on the bus, but are not successfully registered in the device model. This can happen, for example, if errors occur during device addition, leaving the bus state and software state inconsistent. Introduce a reconciliation step to resolve such inconsistencies. Scan all address slots marked as I3C devices by the bus, and compare them against the set of devices currently registered. For any dynamic address that is marked occupied but has no corresponding i3c_dev_desc, probe for device presence using a GETSTATUS CCC. Retry the probe (with exponential backoff delay) to handle transient NACK conditions. If a device responds, register it via i3c_master_add_i3c_dev_locked(). Otherwise, free the address slot so it may be reused in future DAA operations. Note, i3c_master_add_i3c_dev_locked() may fail (again), in which case the dynamic address remains marked as occupied. A future DAA will try again. This also handles a corner case where a device is assigned a dynamic address but not successfully added, and subsequently loses that address (e.g. due to power management). If DAA is run again, the device may receive a new dynamic address while the old one remains marked as occupied. Repeated occurrences of this scenario could eventually exhaust the dynamic address space. The reconciliation step ensures that stale addresses are detected and freed, preventing address leakage. Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260612080107.11606-8-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni

i3c: master: Move DAA API functions after i3c_master_add_i3c_dev_locked()

2026-06-14T19:49:11+00:00

Relocate i3c_master_do_daa_ext() and i3c_master_do_daa() so they appear after i3c_master_add_i3c_dev_locked(). This ordering is required for upcoming changes where the DAA flow will (indirectly) rely on i3c_master_add_i3c_dev_locked() functionality. Reordering avoids forward dependency issues and keeps related code paths logically arranged. No functional change. Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260612080107.11606-7-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni