linux-stable.git/include/linux/iio, branch v6.12.64

iio: buffer: support getting dma channel from the buffer

2025-12-06T21:24:57+00:00

commit a514bb109eada64f798f1c86c17182229cc20fe7 upstream.

Add a new buffer accessor .get_dma_dev() in order to get the
struct device responsible for actually providing the dma channel. We
cannot assume that we can use the parent of the IIO device for mapping
the DMA buffer. This becomes important on systems (like the Xilinx/AMD
zynqMP Ultrascale) where memory (or part of it) is mapped above the
32 bit range. On such systems and given that a device by default has
a dma mask of 32 bits we would then need to rely on bounce buffers (to
swiotlb) for mapping memory above the dma mask limit.

In the process, add an iio_buffer_get_dma_dev() helper function to get
the proper DMA device.

Cc: stable@vger.kernel.org
Reviewed-by: David Lechner 
Signed-off-by: Nuno Sá 
Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: buffer-dma: support getting the DMA channel

2025-12-06T21:24:57+00:00

commit f9c198c3ccaf90a1a265fb2ffa8d4b093c3b0784 upstream.

Implement the .get_dma_dev() callback for DMA buffers by returning the
device that owns the DMA channel. This allows the core DMABUF
infrastructure to properly map DMA buffers using the correct device,
avoiding the need for bounce buffers on systems where memory is mapped
above the 32-bit range.

The function returns the DMA queue's device, which is the actual device
responsible for DMA operations in buffer-dma implementations.

Cc: stable@vger.kernel.org
Reviewed-by: David Lechner 
Signed-off-by: Nuno Sá 
Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: frequency: adf4350: Fix ADF4350_REG3_12BIT_CLKDIV_MODE

2025-10-19T14:33:34+00:00

commit 1d8fdabe19267338f29b58f968499e5b55e6a3b6 upstream.

The clk div bits (2 bits wide) do not start in bit 16 but in bit 15. Fix it
accordingly.

Fixes: e31166f0fd48 ("iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers")
Signed-off-by: Michael Hennerich 
Signed-off-by: Nuno Sá 
Link: https://patch.msgid.link/20250829-adf4350-fix-v2-2-0bf543ba797d@analog.com
Cc: 
Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: trigger: allow devices to suspend/resume theirs associated trigger

2024-08-10T10:19:36+00:00

When a machine enters a sleep state while a trigger is associated to
an iio device that trigger is not resumed after exiting the sleep state:
provide iio device drivers a way to suspend and resume
the associated trigger to solve the aforementioned bug.

Each iio driver supporting external triggers is expected to call
iio_device_suspend_triggering before suspending,
and iio_device_resume_triggering upon resuming.

Signed-off-by: Denis Benato 
Link: https://patch.msgid.link/20240807185619.7261-2-benato.denis96@gmail.com
Signed-off-by: Jonathan Cameron

iio: add child nodes support in iio backend framework

2024-08-10T10:17:34+00:00

Add an API to support IIO generic channels binding:
http://devicetree.org/schemas/iio/adc/adc.yaml#
This new API is needed, as generic channel DT node isn't populated as a
device.
Add devm_iio_backend_fwnode_get() to allow an IIO device backend
consumer to reference backend phandles in its child nodes.

Signed-off-by: Olivier Moysan 
Reviewed-by: Nuno Sa 
Link: https://patch.msgid.link/20240730084640.1307938-4-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron

iio: add enable and disable services to iio backend framework

2024-08-10T10:17:34+00:00

Add iio_backend_disable() and iio_backend_enable() APIs to allow
IIO backend consumer to request backend disabling and enabling.

Signed-off-by: Olivier Moysan 
Reviewed-by: Nuno Sa 
Link: https://patch.msgid.link/20240730084640.1307938-3-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron

iio: add read scale and offset services to iio backend framework

2024-08-10T10:17:34+00:00

Add iio_backend_read_scale() and iio_backend_read_offset() services
to read channel scale and offset from an IIO backbend device.

Also add a read_raw callback which replicates the read_raw callback of
the IIO framework, and is intended to request miscellaneous channel
attributes from the backend device.
Both scale and offset helpers use this callback.

Signed-off-by: Olivier Moysan 
Reviewed-by: Nuno Sa 
Link: https://patch.msgid.link/20240730084640.1307938-2-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron

iio: backend: add a modified prbs23 support

2024-08-03T13:36:45+00:00

Support ADI specific prb23 sequence that can be used both for
calibrating or debugging digital interfaces.

Signed-off-by: Nuno Sa 
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-3-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron

iio: backend: add debugFs interface

2024-08-03T13:36:45+00:00

This adds a basic debugfs interface for backends. Two new ops are being
added:

 * debugfs_reg_access: Analogous to the core IIO one but for backend
   devices.
 * debugfs_print_chan_status: One useful usecase for this one is for
   testing test tones in a digital interface and "ask" the backend to
   dump more details on why a test tone might have errors.

Signed-off-by: Nuno Sa 
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-2-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron

iio: backend: introduce struct iio_backend_info

2024-08-03T13:36:45+00:00

Instead of only passing the backend ops when calling
devm_iio_backend_register(), pass an info like structure that will
contains the ops and additional information. Fow now, the backend name
is being added as that will be used by the debugFS interface introduced
in a later patch.

It also opens the door for further customizations passed by backends.

All users of devm_iio_backend_register() were updated accordingly.

Signed-off-by: Nuno Sa 
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-1-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron