Merge tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char / misc / IIO driver updates from Greg KH:
 "Here is the big set of char, misc, iio, and other smaller driver
  subsystems for 6.15-rc1. Lots of stuff in here, including:

   - loads of IIO changes and driver updates

   - counter driver updates

   - w1 driver updates

   - faux conversions for some drivers that were abusing the platform
     bus interface

   - coresight driver updates

   - rust miscdevice binding updates based on real-world-use

   - other minor driver updates

  All of these have been in linux-next with no reported issues for quite
  a while"

* tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (292 commits)
  samples: rust_misc_device: fix markup in top-level docs
  Coresight: Fix a NULL vs IS_ERR() bug in probe
  misc: lis3lv02d: convert to use faux_device
  tlclk: convert to use faux_device
  regulator: dummy: convert to use the faux device interface
  bus: mhi: host: Fix race between unprepare and queue_buf
  coresight: configfs: Constify struct config_item_type
  doc: iio: ad7380: describe offload support
  iio: ad7380: add support for SPI offload
  iio: light: Add check for array bounds in veml6075_read_int_time_ms
  iio: adc: ti-ads7924 Drop unnecessary function parameters
  staging: iio: ad9834: Use devm_regulator_get_enable()
  staging: iio: ad9832: Use devm_regulator_get_enable()
  iio: gyro: bmg160_spi: add of_match_table
  dt-bindings: iio: adc: Add i.MX94 and i.MX95 support
  iio: adc: ad7768-1: remove unnecessary locking
  Documentation: ABI: add wideband filter type to sysfs-bus-iio
  iio: adc: ad7768-1: set MOSI idle state to prevent accidental reset
  iio: adc: ad7768-1: Fix conversion result sign
  iio: adc: ad7124: Benefit of dev = indio_dev->dev.parent in ad7124_parse_channel_config()
  ...

9 files changed, 1164 insertions, 6 deletions

diff --git a/Documentation/iio/ad4030.rst b/Documentation/iio/ad4030.rst
new file mode 100644
index 000000000000..b57424b650a8
--- /dev/null
+++ b/Documentation/iio/ad4030.rst
@@ -0,0 +1,180 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=============
+AD4030 driver
+=============
+
+ADC driver for Analog Devices Inc. AD4030 and similar devices. The module name
+is ``ad4030``.
+
+
+Supported devices
+=================
+
+The following chips are supported by this driver:
+
+* `AD4030-24 <https://www.analog.com/AD4030-24>`_
+* `AD4032-24 <https://www.analog.com/AD4032-24>`_
+* `AD4630-16 <https://www.analog.com/AD4630-16>`_
+* `AD4630-24 <https://www.analog.com/AD4630-24>`_
+* `AD4632-16 <https://www.analog.com/AD4632-16>`_
+* `AD4632-24 <https://www.analog.com/AD4632-24>`_
+
+IIO channels
+============
+
+Each "hardware" channel as described in the datasheet is split in 2 IIO
+channels:
+
+- One channel for the differential data
+- One channel for the common byte.
+
+The possible IIO channels depending on the numbers of "hardware" channel are:
+
++------------------------------------+------------------------------------+
+| 1 channel ADC                      | 2 channels ADC                     |
++====================================+====================================+
+| - voltage0-voltage1 (differential) | - voltage0-voltage1 (differential) |
+| - voltage2 (common-mode)           | - voltage2-voltage3 (differential) |
+|                                    | - voltage4 (common-mode)           |
+|                                    | - voltage5 (common-mode)           |
++------------------------------------+------------------------------------+
+
+Labels
+------
+
+For ease of use, the IIO channels provide a label. For a differential channel,
+the label is ``differentialN`` where ``N`` is the "hardware" channel id. For a
+common-mode channel, the label is ``common-modeN`` where ``N`` is the
+"hardware" channel id.
+
+The possible labels are:
+
++-----------------+-----------------+
+| 1 channel ADC   | 2 channels ADC  |
++=================+=================+
+| - differential0 | - differential0 |
+| - common-mode0  | - differential1 |
+|                 | - common-mode0  |
+|                 | - common-mode1  |
++-----------------+-----------------+
+
+Supported features
+==================
+
+SPI wiring modes
+----------------
+
+The driver currently supports the following SPI wiring configurations:
+
+One lane mode
+^^^^^^^^^^^^^
+
+In this mode, each channel has its own SDO line to send the conversion results.
+At the moment this mode can only be used on AD4030 which has one channel so only
+one SDO line is used.
+
+.. code-block::
+
+    +-------------+         +-------------+
+    |     ADC     |         |     HOST    |
+    |             |         |             |
+    |         CNV |<--------| CNV         |
+    |          CS |<--------| CS          |
+    |         SDI |<--------| SDO         |
+    |        SDO0 |-------->| SDI         |
+    |        SCLK |<--------| SCLK        |
+    +-------------+         +-------------+
+
+Interleaved mode
+^^^^^^^^^^^^^^^^
+
+In this mode, both channels conversion results are bit interleaved one SDO line.
+As such the wiring is the same as `One lane mode`_.
+
+SPI Clock mode
+--------------
+
+Only the SPI clocking mode is supported.
+
+Output modes
+------------
+
+There are more exposed IIO channels than channels as describe in the devices
+datasheet. This is due to the `Differential data + common-mode`_ encoding
+2 types of information in one conversion result. As such a "device" channel
+provides 2 IIO channels, one for the differential data and one for the common
+byte.
+
+Differential data
+^^^^^^^^^^^^^^^^^
+
+This mode is selected when:
+
+- Only differential channels are enabled in a buffered read
+- Oversampling attribute is set to 1
+
+Differential data + common-mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This mode is selected when:
+
+- Differential and common-mode channels are enabled in a buffered read
+- Oversampling attribute is set to 1
+
+For the 24-bits chips, this mode is also available with 16-bits differential
+data but is not selectable yet.
+
+Averaged differential data
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This mode is selected when:
+
+- Only differential channels are selected enabled in a buffered read
+- Oversampling attribute is greater than 1
+
+Digital Gain and Offset
+-----------------------
+
+Each differential data channel has a 16-bits unsigned configurable hardware
+gain applied to it. By default it's equal to 1. Note that applying gain can
+cause numerical saturation.
+
+Each differential data channel has a signed configurable hardware offset.
+For the ADCs ending in ``-24``, the gain is encoded on 24-bits.
+Likewise, the ADCs ending in ``-16`` have a gain encoded on 16-bits. Note that
+applying an offset can cause numerical saturation.
+
+The final differential data returned by the ADC is computed by first applying
+the gain, then the offset.
+
+The gain is controlled by the ``calibscale`` IIO attribute while the offset is
+controlled by the ``calibbias`` attribute.
+
+Reference voltage
+-----------------
+
+The chip supports an external reference voltage via the ``REF`` input or an
+internal buffered reference voltage via the ``REFIN`` input. The driver looks
+at the device tree to determine which is being used. If ``ref-supply`` is
+present, then the external reference voltage is used and the internal buffer is
+disabled. If ``refin-supply`` is present, then the internal buffered reference
+voltage is used.
+
+Reset
+-----
+
+Both hardware and software reset are supported. The driver looks first at the
+device tree to see if the ``reset-gpio`` is populated.
+If not present, the driver will fallback to a software reset by wiring to the
+device's registers.
+
+Unimplemented features
+----------------------
+
+- ``BUSY`` indication
+- Additional wiring modes
+- Additional clock modes
+- Differential data 16-bits + common-mode for 24-bits chips
+- Overrange events
+- Test patterns
diff --git a/Documentation/iio/ad4695.rst b/Documentation/iio/ad4695.rst
index 9ec8bf466c15..f40593bcc37d 100644
--- a/Documentation/iio/ad4695.rst
+++ b/Documentation/iio/ad4695.rst
@@ -47,6 +47,36 @@ In this mode, CNV and CS are tied together and there is a single SDO line.
 To use this mode, in the device tree, omit the ``cnv-gpios`` and
 ``spi-rx-bus-width`` properties.
 
+SPI offload wiring
+^^^^^^^^^^^^^^^^^^
+
+When used with a SPI offload, the supported wiring configuration is:
+
+.. code-block::
+
+    +-------------+         +-------------+
+    |    GP0/BUSY |-------->| TRIGGER     |
+    |          CS |<--------| CS          |
+    |             |         |             |
+    |     ADC     |         |     SPI     |
+    |             |         |             |
+    |         SDI |<--------| SDO         |
+    |         SDO |-------->| SDI         |
+    |        SCLK |<--------| SCLK        |
+    |             |         |             |
+    |             |         +-------------+
+    |         CNV |<-----+--| PWM         |
+    |             |      +--| GPIO        |
+    +-------------+         +-------------+
+
+In this case, both the ``cnv-gpios`` and  ``pwms`` properties are required.
+The ``#trigger-source-cells = <2>`` property is also required to connect back
+to the SPI offload. The SPI offload will have ``trigger-sources`` property
+with cells to indicate the busy signal and which GPx pin is used, e.g
+``<&ad4695 AD4695_TRIGGER_EVENT_BUSY AD4695_TRIGGER_PIN_GP0>``.
+
+.. seealso:: `SPI offload support`_
+
 Channel configuration
 ---------------------
 
@@ -149,15 +179,62 @@ Gain/offset calibration
 System calibration is supported using the channel gain and offset registers via
 the ``calibscale`` and ``calibbias`` attributes respectively.
 
+Oversampling
+------------
+
+The chip supports per-channel oversampling when SPI offload is being used, with
+available oversampling ratios (OSR) of 1 (default), 4, 16, and 64.  Enabling
+oversampling on a channel raises the effective number of bits of sampled data to
+17 (OSR == 4), 18 (16), or 19 (64), respectively. This can be set via the
+``oversampling_ratio`` attribute.
+
+Setting the oversampling ratio for a channel also changes the sample rate for
+that channel, since it requires multiple conversions per 1 sample. Specifically,
+the new sampling frequency is the PWM sampling frequency divided by the
+particular OSR. This is set automatically by the driver when setting the
+``oversampling_ratio`` attribute. For example, if the device's current
+``sampling_frequency`` is 10000 and an OSR of 4 is set on channel ``voltage0``,
+the new reported sampling rate for that channel will be 2500 (ignoring PWM API
+rounding), while all others will remain at 10000.  Subsequently setting the
+sampling frequency to a higher value on that channel will adjust the CNV trigger
+period for all channels, e.g. if ``voltage0``'s sampling frequency is adjusted
+from 2500 (with an OSR of 4) to 10000, the value reported by
+``in_voltage0_sampling_frequency`` will be 10000, but all other channels will
+now report 40000.
+
+For simplicity, the sampling frequency of the device should be set (considering
+the highest desired OSR value to be used) first, before configuring oversampling
+for specific channels.
+
 Unimplemented features
 ----------------------
 
 - Additional wiring modes
 - Threshold events
-- Oversampling
 - GPIO support
 - CRC support
 
+SPI offload support
+===================
+
+To be able to achieve the maximum sample rate, the driver can be used with the
+`AXI SPI Engine`_ to provide SPI offload support.
+
+.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/ad469x_fmc/index.html
+
+.. seealso:: `SPI offload wiring`_
+
+When SPI offload is being used, some attributes will be different.
+
+* ``trigger`` directory is removed.
+* ``in_voltage0_sampling_frequency`` attributes are added for setting the sample
+  rate.
+* ``in_voltage0_sampling_frequency_available`` attributes are added for querying
+  the max sample rate.
+* ``timestamp`` channel is removed.
+* Buffer data format may be different compared to when offload is not used,
+  e.g. the ``buffer0/in_voltage0_type`` attribute.
+
 Device buffers
 ==============
 
@@ -165,3 +242,28 @@ This driver supports hardware triggered buffers. This uses the "advanced
 sequencer" feature of the chip to trigger a burst of conversions.
 
 Also see :doc:`iio_devbuf` for more general information.
+
+Effective sample rate for buffered reads
+----------------------------------------
+
+When SPI offload is not used, the sample rate is determined by the trigger that
+is manually configured in userspace. All enabled channels will be read in a
+burst when the trigger is received.
+
+When SPI offload is used, the sample rate is configured per channel. All
+channels will have the same rate, so only one ``in_voltageY_sampling_frequency``
+attribute needs to be set. Since this rate determines the delay between each
+individual conversion, the effective sample rate for each sample is actually
+the sum of the periods of each enabled channel in a buffered read. In other
+words, it is the value of the ``in_voltageY_sampling_frequency`` attribute
+divided by the number of enabled channels. So if 4 channels are enabled, with
+the ``in_voltageY_sampling_frequency`` attributes set to 1 MHz, the effective
+sample rate is 250 kHz.
+
+With oversampling enabled, the effective sample rate also depends on the OSR
+assigned to each channel. For example, if one of the 4 channels mentioned in the
+previous case is configured with an OSR of 4, the effective sample rate for that
+channel becomes (1 MHz / 4 ) = 250 kHz. The effective sample rate for all
+four channels is then 1 / ( (3 / 1 MHz) + ( 1 / 250 kHz) ) ~= 142.9 kHz. Note
+that in this case "sample" refers to one read of all enabled channels (i.e. one
+full cycle through the auto-sequencer).
diff --git a/Documentation/iio/ad7191.rst b/Documentation/iio/ad7191.rst
new file mode 100644
index 000000000000..977d4fea14b0
--- /dev/null
+++ b/Documentation/iio/ad7191.rst
@@ -0,0 +1,119 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=============
+AD7191 driver
+=============
+
+Device driver for Analog Devices AD7191 ADC.
+
+Supported devices
+=================
+
+* `AD7191 <https://www.analog.com/AD7191>`_
+
+The AD7191 is a high precision, low noise, 24-bit Σ-Δ ADC with integrated PGA.
+It features two differential input channels, an internal temperature sensor, and
+configurable sampling rates.
+
+Devicetree
+==========
+
+Pin Configuration
+-----------------
+
+The driver supports both pin-strapped and GPIO-controlled configurations for ODR
+(Output Data Rate) and PGA (Programmable Gain Amplifier) settings. These
+configurations are mutually exclusive - you must use either pin-strapped or GPIO
+control for each setting, not both.
+
+ODR Configuration
+^^^^^^^^^^^^^^^^^
+
+The ODR can be configured either through GPIO control or pin-strapping:
+
+- When using GPIO control, specify the "odr-gpios" property in the device tree
+- For pin-strapped configuration, specify the "adi,odr-value" property in the
+  device tree
+
+Available ODR settings:
+
+  - 120 Hz (ODR1=0, ODR2=0)
+  - 60 Hz (ODR1=0, ODR2=1)
+  - 50 Hz (ODR1=1, ODR2=0)
+  - 10 Hz (ODR1=1, ODR2=1)
+
+PGA Configuration
+^^^^^^^^^^^^^^^^^
+
+The PGA can be configured either through GPIO control or pin-strapping:
+
+- When using GPIO control, specify the "pga-gpios" property in the device tree
+- For pin-strapped configuration, specify the "adi,pga-value" property in the
+  device tree
+
+Available PGA gain settings:
+
+  - 1x (PGA1=0, PGA2=0)
+  - 8x (PGA1=0, PGA2=1)
+  - 64x (PGA1=1, PGA2=0)
+  - 128x (PGA1=1, PGA2=1)
+
+Clock Configuration
+-------------------
+
+The AD7191 supports both internal and external clock sources:
+
+- When CLKSEL pin is tied LOW: Uses internal 4.92MHz clock (no clock property
+  needed)
+- When CLKSEL pin is tied HIGH: Requires external clock source
+  - Can be a crystal between MCLK1 and MCLK2 pins
+  - Or a CMOS-compatible clock driving MCLK2 pin
+  - Must specify the "clocks" property in device tree when using external clock
+
+SPI Interface Requirements
+--------------------------
+
+The AD7191 has specific SPI interface requirements:
+
+- The DOUT/RDY output is dual-purpose and requires SPI bus locking
+- DOUT/RDY must be connected to an interrupt-capable GPIO
+- The SPI controller's chip select must be connected to the PDOWN pin of the ADC
+- When CS (PDOWN) is high, the device powers down and resets internal circuitry
+- SPI mode 3 operation (CPOL=1, CPHA=1) is required
+
+Power Supply Requirements
+-------------------------
+
+The device requires the following power supplies:
+
+- AVdd: Analog power supply
+- DVdd: Digital power supply
+- Vref: Reference voltage supply (external)
+
+All power supplies must be specified in the device tree.
+
+Channel Configuration
+=====================
+
+The device provides three channels:
+
+1. Temperature Sensor
+   - 24-bit unsigned
+   - Internal temperature measurement
+   - Temperature in millidegrees Celsius
+
+2. Differential Input (AIN1-AIN2)
+   - 24-bit unsigned
+   - Differential voltage measurement
+   - Configurable gain via PGA
+
+3. Differential Input (AIN3-AIN4)
+   - 24-bit unsigned
+   - Differential voltage measurement
+   - Configurable gain via PGA
+
+Buffer Support
+==============
+
+This driver supports IIO triggered buffers. See Documentation/iio/iio_devbuf.rst
+for more information about IIO triggered buffers.
diff --git a/Documentation/iio/ad7380.rst b/Documentation/iio/ad7380.rst
index c46127700e14..24a92a1c4371 100644
--- a/Documentation/iio/ad7380.rst
+++ b/Documentation/iio/ad7380.rst
@@ -29,6 +29,7 @@ The following chips are supported by this driver:
 * `AD7388-4 <https://www.analog.com/en/products/ad7388-4.html>`_
 * `ADAQ4370-4 <https://www.analog.com/en/products/adaq4370-4.html>`_
 * `ADAQ4380-4 <https://www.analog.com/en/products/adaq4380-4.html>`_
+* `ADAQ4381-4 <https://www.analog.com/en/products/adaq4381-4.html>`_
 
 
 Supported features
@@ -52,8 +53,8 @@ declared in the device tree as ``refin-supply``.
 ADAQ devices
 ~~~~~~~~~~~~
 
-adaq4370-4 and adaq4380-4 don't have an external reference, but use a 3.3V
-internal reference derived from one of its supplies (``refin-supply``)
+ADAQ devices don't have an external reference, but use a 3.3V internal reference
+derived from one of its supplies (``refin-supply``)
 
 All other devices from ad738x family
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -92,6 +93,38 @@ must restart iiod using the following command:
 
 	root:~# systemctl restart iiod
 
+Alert
+-----
+
+2 channels variants of the ad738x family, can use the SDOB line as an alert pin
+when configured in 1 SDO line mode. 4 channels variants, can use SDOD as an
+alert pin when configured in 1 or 2 SDO line(s) mode, although only 1 SDO line
+mode is currently supported by the driver (see `SPI wiring modes`_).
+
+At the end of a conversion the active-low alert pin gets asserted if the
+conversion result exceeds the alert high limit or falls below the alert low
+limit. It is cleared, on a falling edge of CS. The alert pin is common to all
+channels.
+
+User can enable alert using the regular iio events attribute:
+
+.. code-block:: bash
+
+	events/thresh_either_en
+
+The high and low thresholds are common to all channels and can also be set using
+regular iio events attributes:
+
+.. code-block:: bash
+
+	events/in_thresh_falling_value
+	events/in_thresh_rising_value
+
+If debugfs is available, user can read the ALERT register to determine the
+faulty channel and direction.
+
+In most use cases, user will hardwire the alert pin to trigger a shutdown.
+
 Channel selection and sequencer (single-end chips only)
 -------------------------------------------------------
 
@@ -144,8 +177,25 @@ Unimplemented features
 - Rolling average oversampling
 - Power down mode
 - CRC indication
-- Alert
 
+SPI offload support
+===================
+
+To be able to achieve the maximum sample rate, the driver can be used with the
+`AXI SPI Engine`_ to provide SPI offload support.
+
+.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/pulsar_adc/index.html
+
+When SPI offload is being used, some attributes will be different.
+
+* ``trigger`` directory is removed.
+* ``in_voltage0_sampling_frequency`` attribute is added for setting the sample
+  rate.
+* ``in_voltage0_sampling_frequency_available`` attribute is added for querying
+  the max sample rate.
+* ``timestamp`` channel is removed.
+* Buffer data format may be different compared to when offload is not used,
+  e.g. the ``in_voltage0_type`` attribute.
 
 Device buffers
 ==============
diff --git a/Documentation/iio/ad7944.rst b/Documentation/iio/ad7944.rst
index 0d26e56aba88..e6dbe4d7f58c 100644
--- a/Documentation/iio/ad7944.rst
+++ b/Documentation/iio/ad7944.rst
@@ -46,6 +46,8 @@ CS mode, 3-wire, without busy indicator
 To select this mode in the device tree, set the ``adi,spi-mode`` property to
 ``"single"`` and omit the ``cnv-gpios`` property.
 
+This is the only wiring configuration supported when using `SPI offload support`_.
+
 CS mode, 4-wire, without busy indicator
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -106,7 +108,6 @@ Unimplemented features
 ----------------------
 
 - ``BUSY`` indication
-- ``TURBO`` mode
 
 
 Device attributes
@@ -147,6 +148,27 @@ AD7986 is a fully-differential ADC and has the following attributes:
 In "chain" mode, additional chips will appear as additional voltage input
 channels, e.g. ``in_voltage2-voltage3_raw``.
 
+SPI offload support
+===================
+
+To be able to achieve the maximum sample rate, the driver can be used with the
+`AXI SPI Engine`_ to provide SPI offload support.
+
+.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/pulsar_adc/index.html
+
+When SPI offload is being used, some attributes will be different.
+
+* ``trigger`` directory is removed.
+* ``in_voltage0_sampling_frequency`` attribute is added for setting the sample
+  rate.
+* ``in_voltage0_sampling_frequency_available`` attribute is added for querying
+  the max sample rate.
+* ``timestamp`` channel is removed.
+* Buffer data format may be different compared to when offload is not used,
+  e.g. the ``in_voltage0_type`` attribute.
+
+If the ``turbo-gpios`` property is present in the device tree, the driver will
+turn on TURBO during buffered reads and turn it off otherwise.
 
 Device buffers
 ==============
diff --git a/Documentation/iio/adis16550.rst b/Documentation/iio/adis16550.rst
new file mode 100644
index 000000000000..25db7b8060c4
--- /dev/null
+++ b/Documentation/iio/adis16550.rst
@@ -0,0 +1,376 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================
+ADIS16550 driver
+================
+
+This driver supports Analog Device's IMUs on SPI bus.
+
+1. Supported devices
+====================
+
+* `ADIS16550 <https://www.analog.com/ADIS16550>`_
+
+The ADIS16550 is a complete inertial system that includes a triaxis gyroscope
+and a triaxis accelerometer. The factory calibration characterizes each sensor for
+sensitivity, bias, and alignment. As a result, each sensor has its own dynamic
+compensation formulas that provide accurate sensor measurements.
+
+2. Device attributes
+====================
+
+Accelerometer, gyroscope measurements are always provided. Furthermore, the
+driver offers the capability to retrieve the delta angle and the delta velocity
+measurements computed by the device.
+
+The delta angle measurements represent a calculation of angular displacement
+between each sample update, while the delta velocity measurements represent a
+calculation of linear velocity change between each sample update.
+
+Finally, temperature data are provided which show a coarse measurement of
+the temperature inside of the IMU device. This data is most useful for
+monitoring relative changes in the thermal environment.
+
+Each IIO device, has a device folder under ``/sys/bus/iio/devices/iio:deviceX``,
+where X is the IIO index of the device. Under these folders reside a set of
+device files, depending on the characteristics and features of the hardware
+device in questions. These files are consistently generalized and documented in
+the IIO ABI documentation.
+
+The following tables show the adis16550 related device files, found in the
+specific device folder path ``/sys/bus/iio/devices/iio:deviceX``.
+
++-------------------------------------------+----------------------------------------------------------+
+| 3-Axis Accelerometer related device files | Description                                              |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_scale                            | Scale for the accelerometer channels.                    |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_filter_low_pass_3db_frequency    | Bandwidth for the accelerometer channels.                |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_x_calibbias                      | Calibration offset for the X-axis accelerometer channel. |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_x_calibscale                     | Calibration scale for the X-axis accelerometer channel.  |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_x_raw                            | Raw X-axis accelerometer channel value.                  |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_y_calibbias                      | Calibration offset for the Y-axis accelerometer channel. |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_y_calibscale                     | Calibration scale for the Y-axis accelerometer channel.  |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_y_raw                            | Raw Y-axis accelerometer channel value.                  |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_z_calibbias                      | Calibration offset for the Z-axis accelerometer channel. |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_z_calibscale                     | Calibration scale for the Z-axis accelerometer channel.  |
++-------------------------------------------+----------------------------------------------------------+
+| in_accel_z_raw                            | Raw Z-axis accelerometer channel value.                  |
++-------------------------------------------+----------------------------------------------------------+
+| in_deltavelocity_scale                    | Scale for delta velocity channels.                       |
++-------------------------------------------+----------------------------------------------------------+
+| in_deltavelocity_x_raw                    | Raw X-axis delta velocity channel value.                 |
++-------------------------------------------+----------------------------------------------------------+
+| in_deltavelocity_y_raw                    | Raw Y-axis delta velocity channel value.                 |
++-------------------------------------------+----------------------------------------------------------+
+| in_deltavelocity_z_raw                    | Raw Z-axis delta velocity channel value.                 |
++-------------------------------------------+----------------------------------------------------------+
+
++--------------------------------------------+------------------------------------------------------+
+| 3-Axis Gyroscope related device files      | Description                                          |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_scale                           | Scale for the gyroscope channels.                    |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_filter_low_pass_3db_frequency   | Scale for the gyroscope channels.                    |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_x_calibbias                     | Calibration offset for the X-axis gyroscope channel. |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_x_calibscale                    | Calibration scale for the X-axis gyroscope channel.  |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_x_raw                           | Raw X-axis gyroscope channel value.                  |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_y_calibbias                     | Calibration offset for the Y-axis gyroscope channel. |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_y_calibscale                    | Calibration scale for the Y-axis gyroscope channel.  |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_y_raw                           | Raw Y-axis gyroscope channel value.                  |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_z_calibbias                     | Calibration offset for the Z-axis gyroscope channel. |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_z_calibscale                    | Calibration scale for the Z-axis gyroscope channel.  |
++--------------------------------------------+------------------------------------------------------+
+| in_anglvel_z_raw                           | Raw Z-axis gyroscope channel value.                  |
++--------------------------------------------+------------------------------------------------------+
+| in_deltaangl_scale                         | Scale for delta angle channels.                      |
++--------------------------------------------+------------------------------------------------------+
+| in_deltaangl_x_raw                         | Raw X-axis delta angle channel value.                |
++--------------------------------------------+------------------------------------------------------+
+| in_deltaangl_y_raw                         | Raw Y-axis delta angle channel value.                |
++--------------------------------------------+------------------------------------------------------+
+| in_deltaangl_z_raw                         | Raw Z-axis delta angle channel value.                |
++--------------------------------------------+------------------------------------------------------+
+
++----------------------------------+-------------------------------------------+
+| Temperature sensor related files | Description                               |
++----------------------------------+-------------------------------------------+
+| in_temp0_raw                     | Raw temperature channel value.            |
++----------------------------------+-------------------------------------------+
+| in_temp0_offset                  | Offset for the temperature sensor channel.|
++----------------------------------+-------------------------------------------+
+| in_temp0_scale                   | Scale for the temperature sensor channel. |
++----------------------------------+-------------------------------------------+
+
++----------------------------+--------------------------------------------------------------------------------+
+| Miscellaneous device files | Description                                                                    |
++----------------------------+--------------------------------------------------------------------------------+
+| name                       | Name of the IIO device.                                                        |
++----------------------------+--------------------------------------------------------------------------------+
+| sampling_frequency         | Currently selected sample rate.                                                |
++----------------------------+--------------------------------------------------------------------------------+
+
+The following table shows the adis16550 related device debug files, found in the
+specific device debug folder path ``/sys/kernel/debug/iio/iio:deviceX``.
+
++----------------------+-------------------------------------------------------------------------+
+| Debugfs device files | Description                                                             |
++----------------------+-------------------------------------------------------------------------+
+| serial_number        | The serial number of the chip in hexadecimal format.                    |
++----------------------+-------------------------------------------------------------------------+
+| product_id           | Chip specific product id (16550).                                       |
++----------------------+-------------------------------------------------------------------------+
+| flash_count          | The number of flash writes performed on the device.                     |
++----------------------+-------------------------------------------------------------------------+
+| firmware_revision    | String containing the firmware revision in the following format ##.##.  |
++----------------------+-------------------------------------------------------------------------+
+| firmware_date        | String containing the firmware date in the following format mm-dd-yyyy. |
++----------------------+-------------------------------------------------------------------------+
+
+Channels processed values
+-------------------------
+
+A channel value can be read from its _raw attribute. The value returned is the
+raw value as reported by the devices. To get the processed value of the channel,
+apply the following formula:
+
+.. code-block:: bash
+
+        processed value = (_raw + _offset) * _scale
+
+Where _offset and _scale are device attributes. If no _offset attribute is
+present, simply assume its value is 0.
+
+The adis16550 driver offers data for 5 types of channels, the table below shows
+the measurement units for the processed value, which are defined by the IIO
+framework:
+
++--------------------------------------+---------------------------+
+| Channel type                         | Measurement unit          |
++--------------------------------------+---------------------------+
+| Acceleration on X, Y, and Z axis     | Meters per Second squared |
++--------------------------------------+---------------------------+
+| Angular velocity on X, Y and Z axis  | Radians per second        |
++------------------