Infineon XMC4XXX CCU8 PWM 바인딩

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.. dtcompatible:: infineon,xmc4xxx-ccu8-pwm
.. _dtbinding_infineon_xmc4xxx_ccu8_pwm:

infineon,xmc4xxx-ccu8-pwm
#########################

Vendor: :ref:`Infineon Technologies <dt_vendor_infineon>`

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



.. code-block:: none

   Infineon XMC4XXX PWM Capture Compare Unit 8 (CCU8) module

   The PWM CCU8 module can automatically generate a high-side
   and a low-side PWM signal, where the two signals are complementary
   to each other.

   The module supports adding a dead time between the high-side and
   low-side PWM signals.

   The dead time ensures that there is a delay before the PWM state
   transitions from 0 to 1, preventing the high-side and low-side
   switches from being on simultaneously.

   There are two CCU8 modules with DTS node labels: pwm_ccu80 and
   pwm_ccu81. Each module has four slices, and each slice has
   two channels. A channel consists of a corresponding high-side
   and low-side PWM signal.

   The CCU8 modules use the CCU clock source. Each slice applies
   a separate prescaler to divide the clock. The clock divider is
   defined by the 'slice-prescaler' property. Additionally, each
   slice has a dead time prescaler, which divides the slice clock
   for the dead time counter.

   Device tree example:
   A node can define a 'pwm' field, usually referenced in a 'pwms'
   property, where the entries include the PWM module phandle,
   channel number, pulse period (in nanoseconds or set using
   PWM_XX() macros), and a channel
   flag (PWM_POLARITY_NORMAL/PWM_POLARITY_INVERTED).

   The 'pwm_ccu8' node must define the following fields:
   &pwm_ccu80 {
           slice-prescaler = <15 15 15 15>;
           slice-deadtime-prescaler = <3 3 3 3>;
           channel-deadtime-high = <0 0 0 0 PWM_MSEC(100) 0 0 0>;
           channel-deadtime-low = <0 0 0 0 PWM_MSEC(100) 0 0 0>;
           pinctrl-0 = <&pwm_out_p5_9_ccu80_ch4_high &pwm_out_p0_0_ccu80_ch4_low>;
           pinctrl-names = "default";
   };

   This will configure channel 4 with a 100msec deadtime on the high
   and low side PWM signals.

   Another node can reference the PWM as follows:
   &test_node {
      ...
      pwms = <&pwm_ccu80 0 PWM_SEC(1) PWM_POLARITY_NORMAL>;
      ...
   };

   The 'pwm_out_p{PORT}_{PIN}_ccu8{MODULE_IDX}_ch{CHANNEL_IDX}_{HIGH_LOW}'
   format is used for CCU8 pinctrl nodes. 'MODULE_IDX' and 'CHANNEL_IDX'
   refer to a specific 'pwm_ccu8x' module and channel, respectively.
   'PORT/PIN' defines the GPIO that the channel connects to.
   'HIGH_LOW' indicates whether the pin is for the high or low-side signal.

   It's not necessary to specify both the high and low pinctrls. Only the low-side
   signal can, for example, be used as PWM, but note that the duty cycle of the
   low signal will be (1 - duty) as set via the API.

   Note that a slice has two channels. Channels 0/1 are in slice 0,
   channels 2/3 are in slice 1, and so on. Each channel can have its own
   duty cycle and high/low dead times. But the pulse duration applies to
   both channels. Thus, when using the PWM control api to modify the pulse width
   on a channel 0, it will also be updated for channel 1 since they are
   in the same slice.

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

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

                Number of items to expect in a pwm specifier


             This property is **required**.

             Constant value: ``3``

         * - ``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-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.



             This property is **required**.

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

                Defines the clock divider for each slice.
                The entry in the array will divide CCU clock by (2 << value).
                The range for the prescaler values is [0, 15].
                Reducing prescaler value will improve resolution but decrease the maximum period.



             This property is **required**.

         * - ``slice-deadtime-prescaler``
           - ``array``
           - .. code-block:: none

                Defines the clock divider for dead time counter for each slice.
                The range for the values is [0, 3].
                Reducing prescaler value will improve dead time resolution but decrease the
                maximum dead time.



             This property is **required**.

         * - ``channel-deadtime-high``
           - ``array``
           - .. code-block:: none

                Defines the dead time in nanoseconds for the high-side PWM signal for each channel.



             This property is **required**.

         * - ``channel-deadtime-low``
           - ``array``
           - .. code-block:: none

                Defines the dead time in nanoseconds for the low-side PWM signal for each channel.



             This property is **required**.



   .. 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 "infineon,xmc4xxx-ccu8-pwm" 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

                number of address cells in reg property


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

                number of size cells in reg property


         * - ``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().






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

- pwm cells: channel, period, flags