iio: backend: add API for oversampling

Add backend support for setting oversampling ratio.

Reviewed-by: David Lechner <[email protected]>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.

iio: backend: add API for oversampling

Add backend support for setting oversampling ratio.

Reviewed-by: David Lechner <[email protected]>
Signed-off-by: Antoniu Miclaus <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: add support for data size set

Add backend support for setting the data size used.
This setting can be adjusted within the IP cores interfacing devices.

Reviewed-by: Nuno Sa <nuno.sa@a

iio: backend: add support for data size set

Add backend support for setting the data size used.
This setting can be adjusted within the IP cores interfacing devices.

Reviewed-by: Nuno Sa <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Signed-off-by: Antoniu Miclaus <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: add API for interface get

Add backend support for obtaining the interface type used.

Reviewed-by: Nuno Sa <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Signe

iio: backend: add API for interface get

Add backend support for obtaining the interface type used.

Reviewed-by: Nuno Sa <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Signed-off-by: Antoniu Miclaus <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: extend features

Extend backend features with new calls needed later on this
patchset from axi version of ad3552r.

The follwoing calls are added:

iio_backend_ddr_enable()
enable ddr

iio: backend: extend features

Extend backend features with new calls needed later on this
patchset from axi version of ad3552r.

The follwoing calls are added:

iio_backend_ddr_enable()
enable ddr bus transfer
iio_backend_ddr_disable()
disable ddr bus transfer
iio_backend_data_stream_enable()
enable data stream over bus interface
iio_backend_data_stream_disable()
disable data stream over bus interface
iio_backend_data_transfer_addr()
define the target register address where the DAC sample
will be written.

Reviewed-by: Nuno Sa <[email protected]>
Signed-off-by: Angelo Dureghello <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Link: https://patch.msgid.link/20241028-wip-bl-ad3552r-axi-v0-iio-testing-v9-3-f6960b4f9719@kernel-space.org
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: add child nodes support in iio backend framework

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 D

iio: add child nodes support in iio backend framework

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 <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: add enable and disable services to iio backend framework

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

Signed

iio: add enable and disable services to iio backend framework

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 <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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

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

Al

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

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 <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: add a modified prbs23 support

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

Signed-off-by: Nuno Sa <[email protected]>
Li

iio: backend: add a modified prbs23 support

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

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

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iio: backend: add debugFs interface

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.

iio: backend: add debugFs interface

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 <[email protected]>
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-2-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: introduce struct iio_backend_info

Instead of only passing the backend ops when calling
devm_iio_backend_register(), pass an info like structure that will
contains the ops and additiona

iio: backend: introduce struct iio_backend_info

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 <[email protected]>
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-1-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: spelling: continuous -> continuous

This fixes the spelling in IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE.

Signed-off-by: David Lechner <[email protected]>
Link: https://patch.msgid.link

iio: backend: spelling: continuous -> continuous

This fixes the spelling in IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE.

Signed-off-by: David Lechner <[email protected]>
Link: https://patch.msgid.link/20240726-iio-backend-spelling-continuous-v1-1-467c6e3f78ff@baylibre.com
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: remove unused parameter

Indio_dev was not being used in iio_backend_extend_chan_spec() so remove
it.

Signed-off-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/2024070

iio: backend: remove unused parameter

Indio_dev was not being used in iio_backend_extend_chan_spec() so remove
it.

Signed-off-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/20240709-dev-iio-backend-add-debugfs-v1-1-fb4b8f2373c7@analog.com
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: add API for interface tuning

This is in preparation for supporting interface tuning in one for the
devices using the axi-adc backend. The new added interfaces are all
needed for that c

iio: backend: add API for interface tuning

This is in preparation for supporting interface tuning in one for the
devices using the axi-adc backend. The new added interfaces are all
needed for that calibration:

* iio_backend_test_pattern_set();
* iio_backend_chan_status();
* iio_backend_iodelay_set();
* iio_backend_data_sample_trigger().

Interface tuning is the process of going through a set of known points
(typically by the frontend), change some clk or data delays (or both)
and send/receive some known signal (so called test patterns in this
change). The receiving end (either frontend or the backend) is
responsible for validating the signal and see if it's good or not. The
goal for all of this is to come up with ideal delays at the data
interface level so we can have a proper, more reliable data transfer.

Also note that for some devices we can change the sampling rate
(which typically means changing some reference clock) and that can
affect the data interface. In that case, it's import to run the tuning
algorithm again as the values we had before may no longer be the best (or
even valid) ones.

Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: change docs padding

Using tabs and maintaining the start of the docs aligned is a pain and
may lead to lot's of unrelated changes when adding new members. Hence,
let#s change things no

iio: backend: change docs padding

Using tabs and maintaining the start of the docs aligned is a pain and
may lead to lot's of unrelated changes when adding new members. Hence,
let#s change things now and just have a simple space after the member
name.

Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: backend: add new functionality

This adds the needed backend ops for supporting a backend inerfacing
with an high speed dac. The new ops are:

* data_source_set();
* set_sampling_freq();
* exten

iio: backend: add new functionality

This adds the needed backend ops for supporting a backend inerfacing
with an high speed dac. The new ops are:

* data_source_set();
* set_sampling_freq();
* extend_chan_spec();
* ext_info_set();
* ext_info_get().

Also to note the new helpers that are meant to be used by the backends
when extending an IIO channel (adding extended info):

* iio_backend_ext_info_set();
* iio_backend_ext_info_get().

Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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iio: add the IIO backend framework

This is a Framework to handle complex IIO aggregate devices.

The typical architecture is to have one device as the frontend device which
can be "linked" against o

iio: add the IIO backend framework

This is a Framework to handle complex IIO aggregate devices.

The typical architecture is to have one device as the frontend device which
can be "linked" against one or multiple backend devices. All the IIO and
userspace interface is expected to be registers/managed by the frontend
device which will callback into the backends when needed (to get/set
some configuration that it does not directly control).

The basic framework interface is pretty simple:
- Backends should register themselves with @devm_iio_backend_register()
- Frontend devices should get backends with @devm_iio_backend_get()

Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

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