Worldsemi WS2812 RP2040 PIO 바인딩

:orphan:

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.. dtcompatible:: worldsemi,ws2812-rpi_pico-pio
.. _dtbinding_worldsemi_ws2812_rpi_pico_pio:

worldsemi,ws2812-rpi_pico-pio
#############################

Vendor: :ref:`Worldsemi Co., Limited <dt_vendor_worldsemi>`

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



.. code-block:: none

   The pio node configured for ws2812.

Properties
**********

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


These property descriptions apply to "worldsemi,ws2812-rpi_pico-pio"
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

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

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



         * - ``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.



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

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



         * - ``bit-waveform``
           - ``array``
           - .. code-block:: none

                This property defines the waveform for sending 1-bit data.
                The program uses the first three elements of the array.
                The T0 is equal to T0H in the datasheet.
                The T2 is equal to T1L in the datasheet.
                The T1 is equal to (T1H-T0H) or (T0L-T1L) in the datasheet.

                Code-0
                   +------+                 +---
                   |      |                 |
                   |  T0  |      T1+T2      |
                   |      |                 |
                ---+      +-----------------+

                Code-1
                   +---------------+        +---
                   |               |        |
                   |     T0+T1     |   T2   |
                   |               |        |
                ---+               +--------+


                The frequency determines the wave period.
                The T0～T2 means ratio in one period.

                For example, T0=3, T1=3, T2=4 and the frequency is 800kHz case,
                T0H is
                  (1 / 800kHz) * (3/10) = 375ns
                T0L is
                  (1 / 800kHz) * ((4+3)/10) = 875ns





   .. 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 "worldsemi,ws2812-rpi_pico-pio" compatible.

      (None)


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

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

   * - Name
     - Type
     - Details

   * - ``chain-length``
     - ``int``
     - .. code-block:: none

          The number of devices in the daisy-chain.



       This property is **required**.

   * - ``color-mapping``
     - ``array``
     - .. code-block:: none

          Channel to color mapping (or pixel order).

          For example a GRB channel to color mapping would be

             color-mapping = <LED_COLOR_ID_GREEN
                              LED_COLOR_ID_RED
                              LED_COLOR_ID_BLUE>;



       This property is **required**.

   * - ``reset-delay``
     - ``int``
     - .. code-block:: none

          Minimum delay to wait (in microseconds) to make sure that the strip has
          latched the signal. If omitted, a default value of 8 microseconds is used.
          This default is good for the WS2812 controllers. Note that despite the
          WS2812 datasheet states that a 50 microseconds delay is required, it seems
          6 microseconds is enough. The default is set to 8 microseconds just to be
          safe.



       Default value: ``8``

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

          Inherited from ws2812-gpio.yaml.

          Note: This driver does not configure the output pin.
          You need to configure the pin with pinctrl that is in the parent node configuration
          for use by PIO. This property only uses the GPIO pin number and ignores flags.



       This property is **required**.

   * - ``frequency``
     - ``int``
     - .. code-block:: none

          Specify the number of times a waveform representing 1 bit is
          transmitted per second. It is same meaning as bit-per-seconds.
          WS2812 works with 800000. Set the value 400000 if use with WS2811.