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iio: adc: ad-sigma-delta: Document ABI for sigma delta adc

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Add common calibration nodes for sigma delta adc.

Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Link: https://patch.msgid.link/20241202-ad411x_calibration-v3-2-beb6aeec39e2@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Guillaume Ranquet 2024-12-02 11:09:53 +01:00 committed by Jonathan Cameron
parent 031bdc8aee
commit 4d112ebd02
2 changed files with 23 additions and 24 deletions
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23
Documentation/ABI/testing/sysfs-bus-iio-adc-ad-sigma-delta Normal file
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@ -0,0 +1,23 @@
What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_sys_calibration
KernelVersion: 5.5
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, initiates the system calibration procedure. This is done on a
single channel at a time. Write '1' to start the calibration.
What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_sys_calibration_mode_available
KernelVersion: 5.5
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, returns a list with the possible calibration modes.
There are two available options:
"zero_scale" - calibrate to zero scale
"full_scale" - calibrate to full scale
What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_sys_calibration_mode
KernelVersion: 5.5
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, sets up the calibration mode used in the system calibration
procedure. Reading returns the current calibration mode.
Writing sets the system calibration mode.

24
Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192
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@ -19,33 +19,9 @@ Description:
the bridge can be disconnected (when it is not being used
using the bridge_switch_en attribute.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Initiates the system calibration procedure. This is done on a
single channel at a time. Write '1' to start the calibration.
What: /sys/bus/iio/devices/iio:deviceX/in_voltage2-voltage2_shorted_raw
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Measure voltage from AIN2 pin connected to AIN(+)
and AIN(-) shorted.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode_available
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Reading returns a list with the possible calibration modes.
There are two available options:
"zero_scale" - calibrate to zero scale
"full_scale" - calibrate to full scale
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Sets up the calibration mode used in the system calibration
procedure. Reading returns the current calibration mode.
Writing sets the system calibration mode.