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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>`

.. note::

   An implementation of a driver matching this compatible is available in
   :zephyr_file:`drivers/pwm/pwm_xmc4xxx_ccu8.c`.

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

         * - ``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**.

         * - ``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**.

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

                Number of items to expect in a pwm specifier


             This property is **required**.

             Constant value: ``3``

         * - ``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 "infineon,xmc4xxx-ccu8-pwm" compatible.

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

         * - Name
           - Type
           - Details

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

                Information used to address the device. The value is specific to
                the device (i.e. is different depending on the compatible
                property).

                The "reg" property is typically a sequence of (address, length) pairs.
                Each pair is called a "register block". Values are
                conventionally written in hex.

                For details, see "2.3.6 reg" in Devicetree Specification v0.4.



             This property is **required**.

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

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

                Indicates the operational status of the hardware or other
                resource that the node represents. In particular:

                  - "okay" means the resource is operational and, for example,
                    can be used by device drivers
                  - "disabled" means the resource is not operational and the system
                    should treat it as if it is not present

                For details, see "2.3.4 status" in Devicetree Specification v0.4.



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

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

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

                This property is a list of strings that essentially define what
                type of hardware or other resource this devicetree node
                represents. Each device driver checks for specific compatible
                property values to find the devicetree nodes that represent
                resources that the driver should manage.

                The recommended format is "vendor,device", The "vendor" part is
                an abbreviated name of the vendor. The "device" is usually from
                the datasheet.

                The compatible property can have multiple values, ordered from
                most- to least-specific. Having additional values is useful when the
                device is a specific instance of a more general family, to allow the
                system to match the most specific driver available.

                For details, see "2.3.1 compatible" in Devicetree Specification v0.4.



             This property is **required**.

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

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

                Optional names given to each register block in the "reg" property.
                For example:

                  / {
                       soc {
                           #address-cells = <1>;
                           #size-cells = <1>;

                           uart@1000 {
                               reg = <0x1000 0x2000>, <0x3000 0x4000>;
                               reg-names = "foo", "bar";
                           };
                       };
                  };

                The uart@1000 node has two register blocks:

                  - one with base address 0x1000, size 0x2000, and name "foo"
                  - another with base address 0x3000, size 0x4000, and name "bar"



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

                Information about interrupts generated by the device, encoded as an array
                of one or more interrupt specifiers. The format of the data in this property
                varies by where the device appears in the interrupt tree. Devices with the same
                "interrupt-parent" will use the same format in their interrupts properties.

                For details, see "2.4 Interrupts and Interrupt Mapping" in
                Devicetree Specification v0.4.



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

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

                Extended interrupt specifier for device, used as an alternative to
                the "interrupts" property.

                For details, see "2.4 Interrupts and Interrupt Mapping" in
                Devicetree Specification v0.4.



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

                Optional names given to each interrupt generated by a device.
                The interrupts themselves are defined in either "interrupts" or
                "interrupts-extended" properties.

                For details, see "2.4 Interrupts and Interrupt Mapping" in
                Devicetree Specification v0.4.



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

                If present, this refers to the node which handles interrupts generated
                by this device.

                For details, see "2.4 Interrupts and Interrupt Mapping" in
                Devicetree Specification v0.4.



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

                Human readable string describing the device. Use of this property is
                deprecated except as needed on a case-by-case basis.

                For details, see "4.1.2 Miscellaneous Properties" in Devicetree
                Specification v0.4.



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

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

                Information about the device's clock providers. In general, this property
                should follow conventions established in the dt-schema binding:

                  https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/clock/clock.yaml



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

                Optional names given to each clock provider in the "clocks" property.



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

                This property encodes the number of <u32> cells used by address fields
                in "reg" properties in this node's children.

                For details, see "2.3.5 #address-cells and #size-cells" in Devicetree
                Specification v0.4.



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

                This property encodes the number of <u32> cells used by size fields in
                "reg" properties in this node's children.

                For details, see "2.3.5 #address-cells and #size-cells" in Devicetree
                Specification v0.4.



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

                DMA channel specifiers relevant to the device.



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

                Optional names given to the DMA channel specifiers in the "dmas" property.



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

                IO channel specifiers relevant to the device.



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

                Optional names given to the IO channel specifiers in the "io-channels" property.



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

                Mailbox / IPM channel specifiers relevant to the device.



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

                Optional names given to the mbox specifiers in the "mboxes" property.



         * - ``power-domains``
           - ``phandle-array``
           - .. code-block:: none

                Power domain specifiers relevant to the device.



         * - ``power-domain-names``
           - ``string-array``
           - .. code-block:: none

                Optional names given to the power domain specifiers in the "power-domains" property.



         * - ``#power-domain-cells``
           - ``int``
           - .. code-block:: none

                Number of cells in power-domains property



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

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



         * - ``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.



         * - ``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.






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

- pwm cells: channel, period, flags