:orphan:

.. _cypress_psoc6_intmux:

cypress,psoc6-intmux
####################

Vendor: :ref:`Cypress Semiconductor Corporation <dt_vendor_cypress>`

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



.. code-block:: none

   Cypress Interrupt Multiplex

   The PSoC-6 Cortex-M0+ NVIC can handle up to 32 interrupts. This means that
   user can select up to 32 interrupts sources from the 240 possible vectors
   to be processed in the Cortex-M0+ CPU.

   At CPU Sub System (CPUSS) there are 8 special registers (intmux[0~7]) to
   configure the 32 NVIC lines for Cortex-M0+ CPU. Each register handles up to
   4 interrupt sources by grouping intmux channels. These means that each byte
   from intmux[0~7] store a 'vector number' which selects the peripheral
   interrupt source in the multiplexer. The multiplexer is placed before
   Cortex-M0+ NVIC controller. Note that Cortex-M4 have all interrupt sources
   directly connected to NVIC and doesn't require any special configuration.

   On a general view, the below represents the Interrupt Multiplexer
   configuration and how the Cortex-M0+ NVIC sources are organized. Each
   channel chX represents a Cortex-M0+ NVIC line and it stores a vector number.
   The vector number selects the PSoC-6 peripheral interrupt source for the
   Cortex-M0+ NVIC controller line.

   intmux[0] = {ch03, ch02, ch01, ch00}
   intmux[1] = {ch07, ch06, ch05, ch04}
   ...
   intmux[7] = {ch31, ch30, ch29, ch28}

   In pratical terms, the Cortex-M0+ requires user to define all NVIC interrupt
   sources and the proper NVIC interrupt order. With that, the system configures
   the Cortex-M0+ Interrupt Multiplexer and interrupts can be processed.
   More information about it at PSoC-6 Architecture Technical Reference Manual,
   section CPU Sub System (CPUSS) Registers.


   The below fragment configure the GPIO Port 0 to generate an interrupt at
   Cortex-M0+ NVIC:

   At psoc6.dtsi file the gpio_prt0 peripheral had the interrupt source 2:

   gpio_prt0: gpio@40320100 {
     interrupts = <2 1>;
   };

   In order to enable gpio_prt0 interrupt at Cortex-M0+ an interrupt parent
   must be defined at gpio_prt0 node selecting the Interrupt Multiplex Channel.
   This can be defined at <board>_m0.dts file:

   &gpio_prt0 {
     interrupt-parent = <&intmux_ch20>;
   };

   The translation of these two definitions is:
          CH   REGS  INT NUM    CH   CH/REG
   intmux[20 mod 8] |= 0x02 << (20 mod 4);

   These results in Cortex-M0+ NVIC line 20 handling PSoC-6 interrupt source 2.
   The interrupt can be enabled/disable at NVIC at line 20 as usual.

   Notes:
   1) Multiple definitions will generate multiple interrutps
   2) The interrupt sources are shared between Cortex-M0+/M4. These means, can
      trigger action in parallel in both processors.
   3) User can change priority at Cortex-M0+ NVIC by changing interrupt channels
      at interrupt-parent properties.
   4) Only the peripherals used by Cortex-M0+ should be configured.

Properties
**********

.. tabs::

   .. group-tab:: Node specific properties

      Properties not inherited from the base binding file.

      (None)

   .. 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 "cypress,psoc6-intmux" 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.

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

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


             This property is **required**.

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

         * - ``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``
           - ``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


         * - ``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