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Message-ID: <20250829115227.47712-6-antoniu.miclaus@analog.com>
Date: Fri, 29 Aug 2025 11:41:39 +0000
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH v6 5/6] docs: iio: add documentation for ade9000 driver
Add documentation for ade9000 driver which describes the driver
device files and shows how the user may use the ABI for various
scenarios (configuration, measurement, etc.).
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v6:
- add RMS channel documentation with scale and calibbias
- add separate scale docs for each power type
- improve calibration section explanation
- focus events on RMS voltage instead of instantaneous
- add filter_type attributes documentation
- update examples to use RMS voltage events
- complete device file attribute tables
Documentation/iio/ade9000.rst | 292 ++++++++++++++++++++++++++++++++++
Documentation/iio/index.rst | 1 +
2 files changed, 293 insertions(+)
create mode 100644 Documentation/iio/ade9000.rst
diff --git a/Documentation/iio/ade9000.rst b/Documentation/iio/ade9000.rst
new file mode 100644
index 000000000000..869ba154653e
--- /dev/null
+++ b/Documentation/iio/ade9000.rst
@@ -0,0 +1,292 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+ADE9000 driver
+===============
+
+This driver supports Analog Device's ADE9000 energy measurement IC on SPI bus.
+
+1. Supported devices
+====================
+
+* `ADE9000 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9000.pdf>`_
+
+The ADE9000 is a highly accurate, fully integrated, multiphase energy and power
+quality monitoring device. Superior analog performance and a digital signal
+processing (DSP) core enable accurate energy monitoring over a wide dynamic
+range. An integrated high end reference ensures low drift over temperature
+with a combined drift of less than ±25 ppm/°C maximum for the entire channel
+including a programmable gain amplifier (PGA) and an analog-to-digital
+converter (ADC).
+
+2. Device attributes
+====================
+
+Power and energy measurements are provided for voltage, current, active power,
+reactive power, apparent power, and power factor across three phases.
+
+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 question. These files are consistently generalized and documented in
+the IIO ABI documentation.
+
+The following tables show the ADE9000 related device files, found in the
+specific device folder path ``/sys/bus/iio/devices/iio:deviceX``.
+
++---------------------------------------------------+----------------------------------------------------------+
+| Current measurement related device files | Description |
++---------------------------------------------------+----------------------------------------------------------+
+| in_current[0-2]_raw | Raw current measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_current[0-2]_scale | Scale for current channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_current[0-2]_calibscale | Calibration gain for current channels (AIGAIN reg). |
+| in_altcurrent[0-2]_rms_raw | RMS current measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altcurrent[0-2]_rms_scale | Scale for RMS current channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altcurrent[0-2]_rms_calibbias | RMS offset correction for current channels (IRMSOS reg). |
++---------------------------------------------------+----------------------------------------------------------+
+
++---------------------------------------------------+----------------------------------------------------------+
+| Voltage measurement related device files | Description |
++---------------------------------------------------+----------------------------------------------------------+
+| in_voltage[0-2]_raw | Raw voltage measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_voltage[0-2]_scale | Scale for voltage channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_voltage[0-2]_calibscale | Calibration gain for voltage channels (AVGAIN reg). |
+| in_voltage[0-2]_frequency | Measured line frequency for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_raw | RMS voltage measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_scale | Scale for RMS voltage channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_calibbias | RMS offset correction for voltage channels (VRMSOS reg). |
++---------------------------------------------------+----------------------------------------------------------+
+
++---------------------------------------------------+----------------------------------------------------------+
+| Power measurement related device files | Description |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_active_raw | Active power measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_active_scale | Scale for active power channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_active_calibbias | Calibration offset for active power (xWATTOS regs). |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_active_calibscale | Calibration gain for active power (APGAIN reg). |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_reactive_raw | Reactive power measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_reactive_scale | Scale for reactive power channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_reactive_calibbias | Calibration offset for reactive power (xVAROS regs). |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_apparent_raw | Apparent power measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_apparent_scale | Scale for apparent power channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_power[0-2]_powerfactor | Power factor for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+
++---------------------------------------------------+----------------------------------------------------------+
+| Energy measurement related device files | Description |
++---------------------------------------------------+----------------------------------------------------------+
+| in_energy[0-2]_active_raw | Active energy measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_energy[0-2]_reactive_raw | Reactive energy measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_energy[0-2]_apparent_raw | Apparent energy measurement for phases A, B, C. |
++---------------------------------------------------+----------------------------------------------------------+
+
++------------------------------+------------------------------------------------------------------+
+| Shared device attributes | Description |
++------------------------------+------------------------------------------------------------------+
+| name | Name of the IIO device. |
++------------------------------+------------------------------------------------------------------+
+| frequency | System line frequency configuration (50Hz/60Hz). |
++------------------------------+------------------------------------------------------------------+
+| scale | Shared PGA gain setting (1x, 2x, 4x) affecting all channels. |
++------------------------------+------------------------------------------------------------------+
+| filter_type | Waveform buffer filter type (sinc4, sinc4+lp). |
++------------------------------+------------------------------------------------------------------+
+| filter_type_available | Available filter types for waveform buffer. |
++------------------------------+------------------------------------------------------------------+
+
+3. Calibration and scaling
+===========================
+
+The ADE9000 provides multiple levels of gain and offset correction:
+
+**PGA Gain (shared)**
+ The programmable gain amplifier affects the analog input stage for all channels.
+ Controlled via the shared ``scale`` attribute with values 1, 2, or 4.
+
+**Calibration Gain (per-channel)**
+ Fine-tuning calibration gains applied in the digital domain for each channel type.
+ Controlled via ``calibscale`` attributes (AIGAIN, AVGAIN, APGAIN registers).
+
+**Calibration Bias (per-channel)**
+ Hardware calibration offsets applied by the device internally:
+
+ - Power measurements: Controlled via ``calibbias`` attributes for power channels (xWATTOS, xVAROS registers).
+ - RMS measurements: Controlled via ``calibbias`` attributes for RMS channels (IRMSOS, VRMSOS registers).
+
+ These are internal chip calibrations, not userspace-applied offsets.
+
+4. Event attributes
+===================
+
+The ADE9000 provides various interrupts that are mapped to IIO events.
+Event functionality is only available if the corresponding interrupts are
+connected in the device tree.
+
++---------------------------------------------------+----------------------------------------------------------+
+| IIO Event Attribute | ADE9000 Datasheet Equivalent |
++---------------------------------------------------+----------------------------------------------------------+
+| in_voltage[0-2]_thresh_either_en | Zero crossing detection interrupt (ZXVx) |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_thresh_rising_en | RMS swell detection interrupt (SWELLx) |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_thresh_rising_value | RMS swell threshold (SWELL_LVL register) |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_thresh_falling_en | RMS sag/dip detection interrupt (DIPx) |
++---------------------------------------------------+----------------------------------------------------------+
+| in_altvoltage[0-2]_rms_thresh_falling_value | RMS sag/dip threshold (DIP_LVL register) |
++---------------------------------------------------+----------------------------------------------------------+
+| in_current[0-2]_thresh_either_en | Current zero crossing detection interrupt (ZXIx) |
++---------------------------------------------------+----------------------------------------------------------+
+
+Event directions:
+- ``rising``: Upper threshold crossing (swell detection)
+- ``falling``: Lower threshold crossing (sag/dip detection)
+- ``either``: Any threshold crossing (zero crossing detection)
+- ``none``: Timeout or non-directional events
+
+**Note**: Event attributes are only available if the corresponding interrupts
+(irq0, irq1, dready) are specified in the device tree. The driver works without
+interrupts but with reduced functionality.
+
+5. Device buffers
+=================
+
+This driver supports IIO buffers for waveform capture. Buffer functionality
+requires the dready interrupt to be connected.
+
+The device supports capturing voltage and current waveforms for power quality
+analysis. The waveform buffer can be configured to capture data from different
+channel combinations.
+
+Supported channel combinations for buffered capture:
+- Phase A: voltage and current (IA + VA)
+- Phase B: voltage and current (IB + VB)
+- Phase C: voltage and current (IC + VC)
+- All phases: all voltage and current channels
+- Individual channels: IA, VA, IB, VB, IC, VC
+
+Usage examples
+--------------
+
+Enable waveform capture for Phase A:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_current0_en
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_voltage0_en
+
+Set buffer length and enable:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> echo 100 > buffer/length
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > buffer/enable
+
+6. Clock output
+===============
+
+The ADE9000 can provide a clock output via the CLKOUT pin when using an external
+crystal/clock source. This feature is enabled by specifying ``#clock-cells = <0>``
+in the device tree. The output clock will be registered as "clkout" and can be
+referenced by other devices.
+
+7. Usage examples
+=================
+
+Show device name:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat name
+ ade9000
+
+Read voltage measurements:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat in_voltage0_raw
+ 12345
+ root:/sys/bus/iio/devices/iio:device0> cat in_voltage0_scale
+ 0.000030517
+
+- Phase A voltage = in_voltage0_raw * in_voltage0_scale = 0.3769 V
+
+Read power measurements:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat in_power0_active_raw
+ 5678
+ root:/sys/bus/iio/devices/iio:device0> cat in_power0_scale
+ 0.000244140
+
+- Phase A active power = in_power0_active_raw * in_power0_scale = 1.386 W
+
+Configure PGA gain (affects all channels):
+
+.. code-block:: bash
+
+ # Set PGA gain to 2x
+ root:/sys/bus/iio/devices/iio:device0> echo 2 > scale
+ # Read current gain setting
+ root:/sys/bus/iio/devices/iio:device0> cat scale
+ 2
+
+Configure line frequency:
+
+.. code-block:: bash
+
+ # Set to 60Hz operation
+ root:/sys/bus/iio/devices/iio:device0> echo 60 > frequency
+ # Read current frequency setting
+ root:/sys/bus/iio/devices/iio:device0> cat frequency
+ 60
+
+Configure calibration gains:
+
+.. code-block:: bash
+
+ # Set current channel 0 calibration gain
+ root:/sys/bus/iio/devices/iio:device0> echo 0x800000 > in_current0_calibscale
+ # Set voltage channel 0 calibration gain
+ root:/sys/bus/iio/devices/iio:device0> echo 0x7FFFFF > in_voltage0_calibscale
+
+Configure RMS voltage event thresholds (requires interrupts):
+
+.. code-block:: bash
+
+ # Set RMS sag detection threshold
+ root:/sys/bus/iio/devices/iio:device0> echo 180000 > events/in_altvoltage0_rms_thresh_falling_value
+ # Enable RMS sag detection
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > events/in_altvoltage0_rms_thresh_falling_en
+
+ # Set RMS swell detection threshold
+ root:/sys/bus/iio/devices/iio:device0> echo 260000 > events/in_altvoltage0_rms_thresh_rising_value
+ # Enable RMS swell detection
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > events/in_altvoltage0_rms_thresh_rising_en
+
+8. IIO Interfacing Tools
+========================
+
+See ``Documentation/iio/iio_tools.rst`` for the description of the available IIO
+interfacing tools.
+
diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
index c106402a91f7..792c815286f4 100644
--- a/Documentation/iio/index.rst
+++ b/Documentation/iio/index.rst
@@ -28,6 +28,7 @@ Industrial I/O Kernel Drivers
ad7606
ad7625
ad7944
+ ade9000
adis16475
adis16480
adis16550
--
2.43.0
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