Zephyr Retention Area 바인딩

:orphan:

.. raw:: html

    <!--
    FIXME: do not limit page width until content uses another representation
    format other than tables
    -->
    <style>.wy-nav-content { max-width: none; !important }</style>

.. dtcompatible:: zephyr,retention
.. _dtbinding_zephyr_retention:

zephyr,retention
################

Vendor: :ref:`Zephyr-specific binding <dt_vendor_zephyr>`

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



.. code-block:: none

   Retention subsystem area, which has a retained memory parent. Example
   64-byte area with 2-byte prefix and 1-byte checksum with 61 usable bytes
   for user storage:

   sram@2003FFC0 {
     compatible = "zephyr,memory-region", "mmio-sram";
     reg = <0x2003FFC0 64>;
     zephyr,memory-region = "RetainedMem";
     status = "okay";

     retainedmem {
       compatible = "zephyr,retained-ram";
       status = "okay";
       #address-cells = <1>;
       #size-cells = <1>;

       retention0: retention@0 {
         compatible = "zephyr,retention";
         status = "okay";
         reg = <0x0 0x40>;
         prefix = [04 fa];
         checksum = <1>;
       };
     };
   };

Properties
**********

.. 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

         * - ``prefix``
           - ``uint8-array``
           - .. code-block:: none

                An optional magic prefix, which indicates that the data has been set
                (applies to the header of the data, reduces the available user data
                size).



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

                An optional data verification checksum, which indicates that the data is
                valid (appended to the footer of the data, reduces the available user
                data size). Value is size in bytes (0 for none, 1 for 8-bit CRC, 2 for
                16-bit CRC, 4 for 32-bit CRC). Default is to not use a checksum.





   .. 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 "zephyr,retention" compatible.

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

         * - Name
           - Type
           - Details

         * - ``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.



         * - ``zephyr,disabling-power-states``
           - ``phandles``
           - .. code-block:: none

                List of power states that will disable this device power.



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

                register space


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

                interrupts for device


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

         * - ``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**.

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

                Clock gate information


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

                name of each clock


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

                Address reg cell is for the offset of the area in parent node, can be
                increased if multiple retention partitions are used or parts are
                reserved.



             Constant value: ``1``

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

                Size reg cell is for the size of the area, which includes sizes of
                prefix and checksum (if enabled).



             Constant value: ``1``

         * - ``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


         * - ``zephyr,deferred-init``
           - ``boolean``
           - .. code-block:: none

                Do not initialize device automatically on boot. Device should be manually
                initialized using device_init().