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.. dtcompatible:: st,stm32-adc
.. _dtbinding_st_stm32_adc:

st,stm32-adc
############

Vendor: :ref:`STMicroelectronics <dt_vendor_st>`

Description
***********



.. code-block:: none

   ST STM32 family ADC

Properties
**********

Top level properties
====================


These property descriptions apply to "st,stm32-adc"
nodes themselves. This page also describes child node
properties in the following sections.

.. tabs::

   .. group-tab:: Node specific properties

      Properties not inherited from the base binding file.

      .. list-table::
         :widths: 1 1 4
         :header-rows: 1

         * - Name
           - Type
           - Details

         * - ``#io-channel-cells``
           - ``int``
           - This property is **required**.

             Constant value: ``1``

         * - ``pinctrl-0``
           - ``phandles``
           - .. code-block:: none

                Pin configuration/s for the first state. Content is specific to the
                selected pin controller driver implementation.



             This property is **required**.

         * - ``pinctrl-names``
           - ``string-array``
           - .. code-block:: none

                Names for the provided states. The number of names needs to match the
                number of states.



             This property is **required**.

         * - ``st,adc-clock-source``
           - ``int``
           - .. code-block:: none

                Type of ADC clock source :
                - <SYNC>: derived from the bus clock.
                - <ASYNC> : independent and asynchronous with the bus clock
                One of the two values may not apply to some series. Refer to the RefMan.



             This property is **required**.

             Legal values: ``1``, ``2``

         * - ``st,adc-prescaler``
           - ``int``
           - .. code-block:: none

                Clock prescaler at the input of the ADC:
                Apply to synchronous or asynchronous clock depending on the STM32
                st,adc-clock-source.
                Some of the values may not apply to some series, and may depend on the
                selected clock source. Refer to the RefMan.
                On STM32F3x (except STM32F37x), this configures only the synchronous
                prescaler (see properties adcXX-prescaler in st,stm32f3-rcc bindings to
                set asynchronous prescaler).



             This property is **required**.

             Legal values: ``1``, ``2``, ``4``, ``6``, ``8``, ``10``, ``12``, ``16``, ``32``, ``64``, ``128``, ``256``

         * - ``vref-mv``
           - ``int``
           - .. code-block:: none

                Indicates the reference voltage of the ADC in mV (on the target board).


             Default value: ``3300``

         * - ``resolutions``
           - ``array``
           - .. code-block:: none

                List of the resolutions supported by the ADC instance. They should be
                values created with STM32_ADC_RES macro or similar. Their order is not
                important. For example for STM32F4:
                  <STM32_ADC_RES(12, 0x00) STM32_ADC_RES(10, 0x01)
                   STM32_ADC_RES(8, 0x02)  STM32_ADC_RES(6, 0x03)>
                The two parameters are the resolution (for example 10 bits) and the
                corresponding register value (0x01 for a 10-bit resolution).
                By design, these macros also contains all register information (address,
                field offset and field mask) necessary to properly set the resolution.



             This property is **required**.

         * - ``sampling-times``
           - ``array``
           - .. code-block:: none

                List all the sampling times supported by the ADC instance.
                Rounded up if needed. Order is important: their index matches their binary
                value in the register.



             This property is **required**.

         * - ``num-sampling-time-common-channels``
           - ``int``
           - .. code-block:: none

                Number of sampling time common channels for this ADC instance, if any.



         * - ``st,adc-sequencer``
           - ``int``
           - .. code-block:: none

                Type of ADC sequencer:
                - <NOT_FULLY_CONFIGURABLE>: Not fully configurable sequencer
                - <FULLY_CONFIGURABLE>: Fully configurable sequencer



             This property is **required**.

             Legal values: ``0``, ``1``

         * - ``pinctrl-1``
           - ``phandles``
           - .. code-block:: none

                Pin configuration/s for the second state. See pinctrl-0.



         * - ``pinctrl-2``
           - ``phandles``
           - .. code-block:: none

                Pin configuration/s for the third state. See pinctrl-0.



         * - ``pinctrl-3``
           - ``phandles``
           - .. code-block:: none

                Pin configuration/s for the fourth state. See pinctrl-0.



         * - ``pinctrl-4``
           - ``phandles``
           - .. code-block:: none

                Pin configuration/s for the fifth state. See pinctrl-0.





   .. group-tab:: Deprecated node specific properties

      Deprecated properties not inherited from the base binding file.

      (None)

   .. group-tab:: Base properties

      Properties inherited from the base binding file, which defines
      common properties that may be set on many nodes. Not all of these
      may apply to the "st,stm32-adc" compatible.

      .. list-table::
         :widths: 1 1 4
         :header-rows: 1

         * - Name
           - Type
           - Details

         * - ``reg``
           - ``array``
           - .. code-block:: none

                register space


             This property is **required**.

             See :ref:`dt-important-props` for more information.

         * - ``clocks``
           - ``phandle-array``
           - .. code-block:: none

                Clock gate information


             This property is **required**.

         * - ``interrupts``
           - ``array``
           - .. code-block:: none

                interrupts for device


             This property is **required**.

             See :ref:`dt-important-props` for more information.

         * - ``#address-cells``
           - ``int``
           - .. code-block:: none

                number of address cells in reg property


             Constant value: ``1``

         * - ``#size-cells``
           - ``int``
           - .. code-block:: none

                number of size cells in reg property


         * - ``status``
           - ``string``
           - .. code-block:: none

                indicates the operational status of a device


             Legal values: ``'ok'``, ``'okay'``, ``'disabled'``, ``'reserved'``, ``'fail'``, ``'fail-sss'``

             See :ref:`dt-important-props` for more information.

         * - ``compatible``
           - ``string-array``
           - .. code-block:: none

                compatible strings


             This property is **required**.

             See :ref:`dt-important-props` for more information.

         * - ``reg-names``
           - ``string-array``
           - .. code-block:: none

                name of each register space


         * - ``interrupts-extended``
           - ``compound``
           - .. code-block:: none

                extended interrupt specifier for device


         * - ``interrupt-names``
           - ``string-array``
           - .. code-block:: none

                name of each interrupt


         * - ``interrupt-parent``
           - ``phandle``
           - .. code-block:: none

                phandle to interrupt controller node


         * - ``label``
           - ``string``
           - .. code-block:: none

                Human readable string describing the device (used as device_get_binding() argument)



             See :ref:`dt-important-props` for more information.

             This property is **deprecated**.

         * - ``clock-names``
           - ``string-array``
           - .. code-block:: none

                name of each clock


         * - ``dmas``
           - ``phandle-array``
           - .. code-block:: none

                DMA channels specifiers


         * - ``dma-names``
           - ``string-array``
           - .. code-block:: none

                Provided names of DMA channel specifiers


         * - ``io-channels``
           - ``phandle-array``
           - .. code-block:: none

                IO channels specifiers


         * - ``io-channel-names``
           - ``string-array``
           - .. code-block:: none

                Provided names of IO channel specifiers


         * - ``mboxes``
           - ``phandle-array``
           - .. code-block:: none

                mailbox / IPM channels specifiers


         * - ``mbox-names``
           - ``string-array``
           - .. code-block:: none

                Provided names of mailbox / IPM channel specifiers


         * - ``wakeup-source``
           - ``boolean``
           - .. code-block:: none

                Property to identify that a device can be used as wake up source.

                When this property is provided a specific flag is set into the
                device that tells the system that the device is capable of
                wake up the system.

                Wake up capable devices are disabled (interruptions will not wake up
                the system) by default but they can be enabled at runtime if necessary.



         * - ``power-domain``
           - ``phandle``
           - .. code-block:: none


                Power domain the device belongs to.

                The device will be notified when the power domain it belongs to is either
                suspended or resumed.



         * - ``zephyr,pm-device-runtime-auto``
           - ``boolean``
           - .. code-block:: none

                Automatically configure the device for runtime power management after the
                init function runs.






Child node properties
=====================

.. list-table::
   :widths: 1 1 4
   :header-rows: 1

   * - Name
     - Type
     - Details

   * - ``reg``
     - ``array``
     - .. code-block:: none

          Channel identifier.


       This property is **required**.

       See :ref:`dt-important-props` for more information.

   * - ``zephyr,gain``
     - ``string``
     - .. code-block:: none

          Gain selection:
          - ADC_GAIN_1_6: x 1/6
          - ADC_GAIN_1_5: x 1/5
          - ADC_GAIN_1_4: x 1/4
          - ADC_GAIN_1_3: x 1/3
          - ADC_GAIN_2_5: x 2/5
          - ADC_GAIN_1_2: x 1/2
          - ADC_GAIN_2_3: x 2/3
          - ADC_GAIN_4_5: x 4/5
          - ADC_GAIN_1:   x 1
          - ADC_GAIN_2:   x 2
          - ADC_GAIN_3:   x 3
          - ADC_GAIN_4:   x 4
          - ADC_GAIN_6:   x 6
          - ADC_GAIN_8:   x 8
          - ADC_GAIN_12:  x 12
          - ADC_GAIN_16:  x 16
          - ADC_GAIN_24:  x 24
          - ADC_GAIN_32:  x 32
          - ADC_GAIN_64:  x 64
          - ADC_GAIN_128: x 128



       This property is **required**.

       Legal values: ``'ADC_GAIN_1_6'``, ``'ADC_GAIN_1_5'``, ``'ADC_GAIN_1_4'``, ``'ADC_GAIN_1_3'``, ``'ADC_GAIN_2_5'``, ``'ADC_GAIN_1_2'``, ``'ADC_GAIN_2_3'``, ``'ADC_GAIN_4_5'``, ``'ADC_GAIN_1'``, ``'ADC_GAIN_2'``, ``'ADC_GAIN_3'``, ``'ADC_GAIN_4'``, ``'ADC_GAIN_6'``, ``'ADC_GAIN_8'``, ``'ADC_GAIN_12'``, ``'ADC_GAIN_16'``, ``'ADC_GAIN_24'``, ``'ADC_GAIN_32'``, ``'ADC_GAIN_64'``, ``'ADC_GAIN_128'``

   * - ``zephyr,reference``
     - ``string``
     - .. code-block:: none

          Reference selection:
          - ADC_REF_VDD_1:     VDD
          - ADC_REF_VDD_1_2:   VDD/2
          - ADC_REF_VDD_1_3:   VDD/3
          - ADC_REF_VDD_1_4:   VDD/4
          - ADC_REF_INTERNAL:  Internal
          - ADC_REF_EXTERNAL0: External, input 0
          - ADC_REF_EXTERNAL1: External, input 1



       This property is **required**.

       Legal values: ``'ADC_REF_VDD_1'``, ``'ADC_REF_VDD_1_2'``, ``'ADC_REF_VDD_1_3'``, ``'ADC_REF_VDD_1_4'``, ``'ADC_REF_INTERNAL'``, ``'ADC_REF_EXTERNAL0'``, ``'ADC_REF_EXTERNAL1'``

   * - ``zephyr,vref-mv``
     - ``int``
     - .. code-block:: none

          This property can be used to specify the voltage (in millivolts)
          of the reference selected for this channel, so that applications
          can get that value if needed for some calculations.
          For the internal reference, the voltage can be usually obtained with
          a dedicated ADC API call, so there is no need to use this property
          in that case, but for other references this property can be useful.



   * - ``zephyr,acquisition-time``
     - ``int``
     - .. code-block:: none

          Acquisition time.
          Use the ADC_ACQ_TIME macro to compose the value for this property
          or pass ADC_ACQ_TIME_DEFAULT to use the default setting for a given
          hardware (e.g. when the hardware does not allow to configure the
          acquisition time).



       This property is **required**.

   * - ``zephyr,differential``
     - ``boolean``
     - .. code-block:: none

          When set, selects differential input mode for the channel. Otherwise,
          single-ended mode is used unless the zephyr,input-negative property is
          specified, in which case the differential mode is selected implicitly.



   * - ``zephyr,input-positive``
     - ``int``
     - .. code-block:: none

          Positive ADC input. Used only for drivers that select
          the ADC_CONFIGURABLE_INPUTS Kconfig option.



   * - ``zephyr,input-negative``
     - ``int``
     - .. code-block:: none

          Negative ADC input. Used only for drivers that select
          the ADC_CONFIGURABLE_INPUTS Kconfig option.
          When specified, implies the differential input mode for the channel.



   * - ``zephyr,resolution``
     - ``int``
     - .. code-block:: none

          ADC resolution to be used for the channel.



   * - ``zephyr,oversampling``
     - ``int``
     - .. code-block:: none

          Oversampling setting to be used for the channel.
          When specified, each sample is averaged from 2^N conversion results
          (where N is the provided value).



   * - ``zephyr,current-source-pin``
     - ``uint8-array``
     - .. code-block:: none

          Output pin selection for the current sources. The actual
          interpretation depends on the driver. This is used only for drivers
          which select the ADC_CONFIGURABLE_EXCITATION_CURRENT_SOURCE_PIN
          Kconfig option.



   * - ``zephyr,vbias-pins``
     - ``int``
     - .. code-block:: none

          Output pin selection for the bias voltage. The actual interpretation
          depends on the driver. This is used only for drivers which select
          the ADC_CONFIGURABLE_VBIAS_PIN Kconfig option.



Specifier cell names
********************

- io-channel cells: input