Add kernel-doc documentation for the struct members that were previously
undocumented. This fixes warnings when building with W=1 and ensures
the struct is fully documented per kernel-doc conventions.
Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260603031135.289302-1-rosenp@gmail.com
The driver carries custom system suspend/resume handling that manually
tracks a suspended state and conditionally calls
geni_i2c_runtime_suspend()
from the noirq suspend path, then adjusts runtime PM state by hand. This
duplicates PM core behavior and adds unnecessary complexity.
Drop the manual state tracking and switch to pm_runtime_force_suspend()
and pm_runtime_force_resume() for system sleep. These helpers already
perform the required checks, call the runtime PM callbacks when needed,
and keep runtime PM state transitions consistent.
Reviewed-by: Mukesh Kumar Savaliya <mukesh.savaliya@oss.qualcomm.com>
Signed-off-by: Praveen Talari <praveen.talari@oss.qualcomm.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260520-use_pm_runtime_apis-v1-1-6a5238fc6cb6@oss.qualcomm.com
Add Shikra compatible consistent with CAMSS CCI interfaces.
It requires only two clocks.
Signed-off-by: Nihal Kumar Gupta <nihal.gupta@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Convert the device-tree parsing path to the generic fwnode/device
property accessors so the driver can be probed on ACPI and swnode
platforms as well as OF. The helper is renamed from
i2c_mux_reg_probe_dt() to i2c_mux_reg_probe_fw() to reflect that.
Accessor translation:
of_parse_phandle("i2c-parent") +
of_find_i2c_adapter_by_node() -> fwnode_find_reference() +
i2c_find_adapter_by_fwnode()
of_get_child_count() -> device_get_child_node_count()
of_property_read_bool() -> device_property_read_bool()
for_each_child_of_node() -> device_for_each_child_node()
of_property_read_u32("reg") on ACPI device nodes:
acpi_get_local_address()
everything else (OF, swnode,
ACPI data nodes):
fwnode_property_read_u32()
of_property_read_u32("idle-state") -> device_property_read_u32()
The child-node branch uses is_acpi_device_node() rather than
is_acpi_node(): the latter also matches ACPI data nodes (the
_DSD hierarchical-property children used by PRP0001-style
firmware), which have no ACPI handle and would make
acpi_get_local_address() fall back to evaluating _ADR against the
root namespace and return -ENODATA. Routing data nodes through
fwnode_property_read_u32() instead lets them resolve the "reg"
property the same way OF and swnode children do.
Behavioural preservations (deliberate, to avoid regressing existing
users):
- The three-way endian fallback is kept verbatim: an explicit
"little-endian" property wins, then "big-endian", and otherwise
the host's compile-time byte order. device_is_big_endian() is
not used here because it ignores "little-endian" and introduces
"native-endian" semantics, which would diverge from the binding.
- The "if (!mux->data.reg)" guard around
devm_platform_get_and_ioremap_resource() in probe() is kept.
drivers/platform/mellanox/mlx-platform.c registers i2c-mux-reg
platform_devices with no memory resource and supplies a
pre-set .reg / .reg_size through struct
i2c_mux_reg_platform_data; without the guard those
registrations would fail in probe().
- The "if (!mux->data.reg)" ioremap block (and the paired
reg_size validation that depends on it) is hoisted above
i2c_get_adapter(mux->data.parent), so the fwnode path
preserves master's ordering of "ioremap before parent-adapter
get". For platdata users the validation runs from a slightly
earlier position, but mux->data.reg_size is already set from
platdata by then, so the order is functionally neutral.
The OF-only of_address_to_resource() translation in the old
probe_dt() is dropped because the same address is available from
the platform_device resource table on OF as well as ACPI, and the
existing fallback in probe() ioremaps it.
Acked-by: Peter Rosin <peda@lysator.liu.se>
Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
Assisted-by: Claude-Code:claude-opus-4-7
Assisted-by: sashiko:gemini-3.1-pro-preview
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Some users want to return an error to the upper layers when
i2c_acpi_client_count() returns 0. Follow the common pattern
in such cases, i.e. return -ENOENT instead of 0.
While at it, fix the kernel-doc warning about missing return value
description.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
The AT91 I2C driver depends on ARCH_MICROCHIP.
This I2C controller can be used by the LAN966x PCI device and so
it needs to be available when the LAN966x PCI device is enabled.
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
The .driver_data member of the struct pci_device_id array 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) <u.kleine-koenig@baylibre.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/41316792102ff2860ec019373293cb07d545a0b0.1779481436.git.u.kleine-koenig@baylibre.com
The .driver_data member of the struct pci_device_id array 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
array. Tested on x86 and arm64.
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/68667c4ab85716b190d8b705813b610e21a386f6.1779481436.git.u.kleine-koenig@baylibre.com
Fix a spelling mistake in the timeout-check comment.
No functional change.
Signed-off-by: Stepan Ionichev <sozdayvek@gmail.com>
Acked-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260503165925.1738-1-sozdayvek@gmail.com
During system reboot or kexec, in-flight I2C transfers can cause
spurious interrupts or leave the bus in an undefined state. Add a
shutdown handler that marks the adapter suspended and resets the
controller, ensuring a clean handoff.
Signed-off-by: Ajay Neeli <ajay.neeli@amd.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260430053050.3590173-1-ajay.neeli@amd.com
Recent Tegra I2C controllers have a fairness arbitration register, which
allows configuring the fair idle time required to support MCTP protocol
over I2C. It is enabled by default, adding a per-transfer latency overhead
that impacts non-MCTP I2C buses.
Disable the fairness arbitration register during controller init for buses
that are not MCTP controllers.
Assisted-by: Cursor:claude-4.6-opus
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260518114013.62065-3-akhilrajeev@nvidia.com
Use dmaengine_get_dma_device() to obtain the correct struct device
pointer for dma_alloc_coherent() instead of directly dereferencing
chan->device->dev.
The dmaengine_get_dma_device() helper checks whether the DMA channel
has a per-channel DMA device (chan->dev->chan_dma_dev) and returns it
when available, falling back to the controller device otherwise. On
platforms where the DMA controller sits behind an IOMMU with
per-channel IOVA spaces (e.g. Tegra264 GPC DMA), the per-channel
device carries the correct DMA mapping context. Using the controller
device directly would allocate DMA buffers against the wrong IOMMU
domain, leading to SMMU faults at runtime.
On platforms without per-channel DMA devices the helper returns the
same pointer as before, so there is no change in behavior for existing
hardware.
Assisted-by: Cursor:claude-4.6-opus
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260518114013.62065-2-akhilrajeev@nvidia.com
- use named initializers for arrays of i2c_device_data
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Merge tag 'at24-updates-for-v7.2-rc1' into i2c/i2c-host
at24 updates for v7.2-rc1
- use named initializers for arrays of i2c_device_data
Enable I2C_K1 by default when ARCH_SPACEMIT is configured to ensure SD
card functionality works out-of-the-box.
SpacemiT K1 boards use I2C-controlled PMICs (like the P1 chip) to
provide SD card power supplies. Without the I2C_K1 driver enabled,
regulators cannot be controlled and SD card detection/operation fails.
Suggested-by: Margherita Milani <margherita.milani@amarulasolutions.com>
Suggested-by: Yixun Lan <dlan@kernel.org>
Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260526-orangepi-sd-card-i2c-v1-1-b92268bfd467@gmail.com
While being less compact, using named initializers allows to more easily
see which members of the structs are assigned which value without having
to lookup the declaration of the struct. And it's also more robust
against changes to the struct definition.
The mentioned robustness is relevant for a planned change to struct
i2c_device_id that replaces .driver_data by an anonymous union.
While touching all these arrays, unify usage of whitespace in the list
terminator.
This patch doesn't modify the compiled arrays, only their representation
in source form benefits. The former was confirmed with x86 and arm64
builds.
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20260518164510.805502-2-u.kleine-koenig@baylibre.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Clean up the adapter registration error labels by making sure that also
the last one is named after what it does.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Clean up bus id allocation by using a common helper and deferring it
until it is needed during adapter registration.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Adapters can be looked up by their id using i2c_get_adapter() which
takes a reference to the embedded struct device.
Remove the adapter from the IDR before tearing it down during
deregistration (and on registration failure) to make sure its resources
are not accessed after having been freed (e.g. the device name).
Fixes: 35fc37f818 ("i2c: Limit core locking to the necessary sections")
Cc: stable@vger.kernel.org # 2.6.31
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Adapters can be looked up based on their id using i2c_get_adapter()
which takes a reference to the embedded struct device.
Make sure that the adapter (including its struct device) has been
initialised before adding it to the IDR to avoid accessing uninitialised
data which could, for example, lead to NULL-pointer dereferences or
use-after-free.
Note that the i2c-dev chardev, which is registered from a bus notifier,
currently uses i2c_get_adapter() so the adapter needs to be added to the
IDR before registration.
Fixes: 6e13e64184 ("i2c: Add i2c_add_numbered_adapter()")
Cc: stable@vger.kernel.org # 2.6.22
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Runtime PM is disabled by driver core when deregistering a device (and
on registration failure) but add an explicit disable to balance the
enable call when adapter registration fails for symmetry.
Fixes: 23a698fe65 ("i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs")
Cc: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Clients can be registered from bus notifier callbacks so the debugfs
directory needs to be created before registering the adapter as clients
use that directory as their debugfs parent.
Move debugfs creation before adapter registration to avoid having
clients create their debugfs directories in the debugfs root (which is
also more likely to fail due to name collisions).
Note that failure to allocate the adapter name must now be handled
explicitly as debugfs_create_dir() cannot handle a NULL name (unlike
device_add() which returns an error).
Fixes: 73febd775b ("i2c: create debugfs entry per adapter")
Cc: stable@vger.kernel.org # 6.8
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Drivers must not probe defer after having registered devices as that
will trigger a probe loop if the devices bind to a driver (cf. commit
fbc35b45f9 ("Add documentation on meaning of -EPROBE_DEFER")).
Move the recovery initialisation, where the GPIO lookup may fail, before
registering the adapter to prevent this.
Fixes: 75820314de ("i2c: core: add generic I2C GPIO recovery")
Cc: stable@vger.kernel.org # 5.9
Cc: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
If adapter registration ever fails the release callback would trigger a
NULL-pointer dereference as the completion struct has not been
initialised.
Note that before the offending commit this would instead have resulted
in a minor memory leak of the adapter name.
Fixes: 3f8c4f5e9a ("i2c: core: fix reference leak in i2c_register_adapter()")
Cc: stable@vger.kernel.org
Cc: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Clients may be registered from bus notifier callbacks when the adapter
is registered. On a subsequent error during registration, the adapter
references taken by such clients prevent the wait for the references to
be released from ever completing.
Fix this by refactoring client deregistration and deregistering also on
late adapter registration failures.
Fixes: f8756c67b3 ("i2c: core: call of_i2c_setup_smbus_alert in i2c_register_adapter")
Cc: stable@vger.kernel.org # 4.15
Cc: Phil Reid <preid@electromag.com.au>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Make sure to tear down the host notify irq domain on adapter
registration failure to avoid leaking it.
This issue was flagged by Sashiko when reviewing another adapter
registration fix.
Fixes: 4d5538f588 ("i2c: use an IRQ to report Host Notify events, not alert")
Cc: stable@vger.kernel.org # 4.10
Cc: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Add ACPI ID "LECA0003" for LECARC SoCs that integrate
the DesignWare I2C controller.
Also add corresponding ACPI description in acpi_apd.c.
Signed-off-by: Thomas Lin <thomas_lin@lecomputing.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260526-lecarc-i2c-acpi-id-v1-1-f0942bd491d2@lecomputing.com
When the I2C controller attempts a new transaction while the target
controller is shutting down or restarting, it can lead to bus lockups
and system bootloops if the hardware enters an inconsistent state.
Address this by ensuring that the internal state machines are properly
cleared when disabling the controller if target activity is detected.
If the controller remains active after disabling, perform a bus recovery
to reset it to a known good state.
Signed-off-by: William A. Kennington III <william@wkennington.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-4-3483057f8d67@wkennington.com
Convert the platform driver to use the new i2c_dw_shutdown() hook,
allowing the controller to gracefully NACK controllers requests during
system shutdown.
Signed-off-by: William A. Kennington III <william@wkennington.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-3-3483057f8d67@wkennington.com
Convert the PCI driver to use the new i2c_dw_shutdown() hook, allowing
the controller to gracefully NACK controller requests during system
shutdown.
Signed-off-by: William A. Kennington III <william@wkennington.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-2-3483057f8d67@wkennington.com
Introduce an exported shutdown function to safely shutdown the
DesignWare I2C controller.
This shutdown hook gracefully sets the target disable bit before disabling
the controller. This guarantees that any incoming requests from the
controller are immediately NACKed during shutdown, preventing the bus from
hanging.
Signed-off-by: William A. Kennington III <william@wkennington.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-1-3483057f8d67@wkennington.com
Using named initializers is more explicit and thus easier to parse for a
human.
While touching this array, drop explicit zeros from the list terminator.
This change doesn't introduce changes to the compiled zorro_device_id
array.
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Reviewed-by: Max Staudt <max@enpas.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/3d7690c7a8948f977d6c50bd0c8010efb715fbdc.1779803053.git.u.kleine-koenig@baylibre.com
While being less compact, using named initializers allows to more easily
see which members of the structs are assigned which value without having
to lookup the declaration of the struct. And it's also more robust
against changes to the struct definition.
The mentioned robustness is relevant for a planned change to struct
i2c_device_id that replaces .driver_data by an anonymous union.
This patch doesn't modify the compiled array, only its representation
in source form benefits. The former was confirmed with x86 and arm64
builds.
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20260519093806.1567914-2-u.kleine-koenig@baylibre.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Convert the Texas Instruments DaVinci and Keystone I2C controller
bindings from legacy text format to modern dt-schema (YAML).
During the conversion, the `interrupts` property was made required
to match the strict requirement in the driver probe function. The
custom `ti,has-pfunc` and `power-domains` properties were also
properly defined to match SoC-specific hardware features.
Signed-off-by: Chaitanya Sabnis <chaitanya.msabnis@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260513123758.4955-1-chaitanya.msabnis@gmail.com
The direction of a single-ended (open-drain or open-source) GPIO line
cannot always be reliably determined by reading hardware registers.
In true open-drain implementations, the "high" state is achieved by
entering a high-impedance mode, which many hardware controllers report
as "input" even if the software intends to use it as an output.
This creates issues for consumer drivers (like I2C) that rely on
gpiod_get_direction() to decide if a line can be driven.
Introduce gpiod_is_single_ended() to allow consumers to check the
software configuration (GPIO_FLAG_OPEN_DRAIN/GPIO_FLAG_OPEN_SOURCE) of
a descriptor. This provides a robust way to identify lines that are
capable of being driven, regardless of their instantaneous hardware state.
Signed-off-by: Jie Li <jie.i.li@nokia.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260511113726.49041-2-jie.i.li@nokia.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Use new PM_RUNTIME_ACQUIRE() and PM_RUNTIME_ACQUIRE_ERR() wrapper macros
to make the code look more straightforward.
No intentional functional impact.
Signed-off-by: Xueqin Luo <luoxueqin@kylinos.cn>
Acked-by: Mika Westerberg <mika.westerberg@linx.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260417075451.5435-1-luoxueqin@kylinos.cn
This I2C module is integrated into the Loongson-2K0300 SoCs.
It provides multi-master functionality and controls all I2C bus-specific
timing, protocols, arbitration, and timing. It supports both standard
and fast modes.
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/c5a6c4e5ea675410ff1b946b988c280c22bf3dc4.1776135865.git.zhoubinbin@loongson.cn
