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authorMarcelo Schmitt <marcelo.schmitt@analog.com>2024-07-12 21:22:25 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2024-08-03 11:55:34 +0200
commitdfcc937a00a77af56c5edc15224686fab19730e5 (patch)
treefd14961660a1b4bbad5802164be7d06fc8d9d045 /Documentation/iio
parentiio: adc: Add support for AD4000 (diff)
downloadlinux-dfcc937a00a77af56c5edc15224686fab19730e5.tar.xz
linux-dfcc937a00a77af56c5edc15224686fab19730e5.zip
Documentation: Add AD4000 documentation
Reviewed-by: David Lechner <dlechner@baylibre.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: David Lechner <dlechner@baylibre.com> Link: https://patch.msgid.link/aeee5fd9deccf85beadecf58c9b938b97a3aeba5.1720810545.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'Documentation/iio')
-rw-r--r--Documentation/iio/ad4000.rst131
-rw-r--r--Documentation/iio/index.rst1
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diff --git a/Documentation/iio/ad4000.rst b/Documentation/iio/ad4000.rst
new file mode 100644
index 000000000000..de8fd3ae6e62
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+++ b/Documentation/iio/ad4000.rst
@@ -0,0 +1,131 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=============
+AD4000 driver
+=============
+
+Device driver for Analog Devices Inc. AD4000 series of ADCs.
+
+Supported devices
+=================
+
+* `AD4000 <https://www.analog.com/AD4000>`_
+* `AD4001 <https://www.analog.com/AD4001>`_
+* `AD4002 <https://www.analog.com/AD4002>`_
+* `AD4003 <https://www.analog.com/AD4003>`_
+* `AD4004 <https://www.analog.com/AD4004>`_
+* `AD4005 <https://www.analog.com/AD4005>`_
+* `AD4006 <https://www.analog.com/AD4006>`_
+* `AD4007 <https://www.analog.com/AD4007>`_
+* `AD4008 <https://www.analog.com/AD4008>`_
+* `AD4010 <https://www.analog.com/AD4010>`_
+* `AD4011 <https://www.analog.com/AD4011>`_
+* `AD4020 <https://www.analog.com/AD4020>`_
+* `AD4021 <https://www.analog.com/AD4021>`_
+* `AD4022 <https://www.analog.com/AD4022>`_
+* `ADAQ4001 <https://www.analog.com/ADAQ4001>`_
+* `ADAQ4003 <https://www.analog.com/ADAQ4003>`_
+
+Wiring connections
+------------------
+
+Devices of the AD4000 series can be connected to the SPI host controller in a
+few different modes.
+
+CS mode, 3-wire turbo mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Datasheet "3-wire" mode is what most resembles standard SPI connection which,
+for these devices, comprises of connecting the controller CS line to device CNV
+pin and other SPI lines as usual. This configuration is (misleadingly) called
+"CS Mode, 3-Wire Turbo Mode" connection in datasheets.
+NOTE: The datasheet definition of 3-wire mode for the AD4000 series is NOT the
+same of standard spi-3wire mode.
+This is the only connection mode that allows configuration register access but
+it requires the SPI controller to support the ``SPI_MOSI_IDLE_HIGH`` feature.
+
+Omit the ``adi,sdi-pin`` property in device tree to select this mode.
+
+::
+
+ +-------------+
+ + ----------------------------------| SDO |
+ | | |
+ | +-------------------| CS |
+ | v | |
+ | +--------------------+ | HOST |
+ | | CNV | | |
+ +--->| SDI AD4000 SDO |-------->| SDI |
+ | SCK | | |
+ +--------------------+ | |
+ ^ | |
+ +--------------------| SCLK |
+ +-------------+
+
+CS mode, 3-wire, without busy indicator
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Another wiring configuration supported as "3-wire" mode has the SDI pin
+hard-wired to digital input/output interface supply (VIO). In this setup, the
+controller is not required to support ``SPI_MOSI_IDLE_HIGH`` but register access
+is not possible. This connection mode saves one wire and works with any SPI
+controller.
+
+Set the ``adi,sdi-pin`` device tree property to ``"high"`` to select this mode.
+
+::
+
+ +-------------+
+ +--------------------| CS |
+ v | |
+ VIO +--------------------+ | HOST |
+ | | CNV | | |
+ +--->| SDI AD4000 SDO |-------->| SDI |
+ | SCK | | |
+ +--------------------+ | |
+ ^ | |
+ +--------------------| SCLK |
+ +-------------+
+
+Alternatively, a GPIO may be connected to the device CNV pin. This is similar to
+the previous wiring configuration but saves the use of a CS line.
+
+::
+
+ +-------------+
+ +--------------------| GPIO |
+ v | |
+ VIO +--------------------+ | HOST |
+ | | CNV | | |
+ +--->| SDI AD4000 SDO |-------->| SDI |
+ | SCK | | |
+ +--------------------+ | |
+ ^ | |
+ +--------------------| SCLK |
+ +-------------+
+
+CS mode, 4-wire without busy indicator
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In datasheet "4-wire" mode, the controller CS line is connected to the ADC SDI
+pin and a GPIO is connected to the ADC CNV pin. This connection mode may better
+suit scenarios where multiple ADCs can share one CNV trigger.
+
+Set ``adi,sdi-pin`` to ``"cs"`` to select this mode.
+
+
+::
+
+ +-------------+
+ + ----------------------------------| CS |
+ | | |
+ | +-------------------| GPIO |
+ | v | |
+ | +--------------------+ | HOST |
+ | | CNV | | |
+ +--->| SDI AD4000 SDO |-------->| SDI |
+ | SCK | | |
+ +--------------------+ | |
+ ^ | |
+ +--------------------| SCLK |
+ +-------------+
diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
index 7c4f72c71896..dfcf9618568a 100644
--- a/Documentation/iio/index.rst
+++ b/Documentation/iio/index.rst
@@ -18,6 +18,7 @@ Industrial I/O Kernel Drivers
.. toctree::
:maxdepth: 1
+ ad4000
ad4695
ad7380
ad7944