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.. dtcompatible:: gpio-kbd-matrix
.. _dtbinding_gpio_kbd_matrix:

gpio-kbd-matrix
###############

Vendor: :ref:`Generic or vendor-independent <dt_no_vendor>`

.. note::

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

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



.. code-block:: none

   GPIO based keyboard matrix input device

   Implement an input device for a GPIO based keyboard matrix.

   Example configuration:

   kbd-matrix {
           compatible = "gpio-kbd-matrix";
           row-gpios = <&gpio0 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
                       <&gpio0 1 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
           col-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>,
                       <&gpio0 3 GPIO_ACTIVE_LOW>,
                       <&gpio0 4 GPIO_ACTIVE_LOW>;
           no-ghostkey-check;
   };

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

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

                GPIO for the keyboard matrix rows, up to 8 different GPIOs. All row GPIO
                pins must have interrupt support if idle-mode is set to "interrupt"
                (default).



             This property is **required**.

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

                GPIO for the keyboard matrix columns, supports up to 32 different GPIOs.
                When unselected, this pin will be either driven to inactive state or
                configured to high impedance (input) depending on the col-drive-inactive
                property.



             This property is **required**.

         * - ``col-drive-inactive``
           - ``boolean``
           - .. code-block:: none

                If enabled, unselected column GPIOs will be driven to inactive state.
                Default to configure unselected column GPIOs to high impedance.



         * - ``idle-mode``
           - ``string``
           - .. code-block:: none

                Controls the driver behavior on idle, "interrupt" waits for a new key
                press using GPIO interrupts on the row lines, "poll"  periodically polls
                the row lines with all the columns selected, "scan" just keep scanning
                the matrix continuously, requires "poll-timeout-ms" to be set to 0.



             Default value: ``interrupt``

             Legal values: ``'interrupt'``, ``'poll'``, ``'scan'``

         * - ``poll-period-ms``
           - ``int``
           - .. code-block:: none

                Defines the poll period in msecs between between matrix scans, set to 0
                to never exit poll mode. Defaults to 5ms if unspecified.



             Default value: ``5``

         * - ``stable-poll-period-ms``
           - ``int``
           - .. code-block:: none

                Defines the poll period in msecs between matrix scans when the matrix is
                stable, defaults to poll-period-ms value if unspecified.



         * - ``poll-timeout-ms``
           - ``int``
           - .. code-block:: none

                How long to wait before going from polling back to idle state. Defaults
                to 100ms if unspecified.



             Default value: ``100``

         * - ``debounce-down-ms``
           - ``int``
           - .. code-block:: none

                Debouncing time for a key press event. Defaults to 10ms if unspecified.



             Default value: ``10``

         * - ``debounce-up-ms``
           - ``int``
           - .. code-block:: none

                Debouncing time for a key release event. Defaults to 20ms if unspecified.



             Default value: ``20``

         * - ``settle-time-us``
           - ``int``
           - .. code-block:: none

                Delay between setting column output and reading the row values. Defaults
                to 50us if unspecified.



             Default value: ``50``

         * - ``actual-key-mask``
           - ``array``
           - .. code-block:: none

                Keyboard scanning mask. For each keyboard column, specify which keyboard rows actually exist. Can be used to avoid triggering the ghost detection on non existing keys. No masking by default, any combination is valid.


         * - ``no-ghostkey-check``
           - ``boolean``
           - .. code-block:: none

                Ignore the ghost key checking in the driver if the diodes are used
                in the matrix hardware.





   .. 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 "gpio-kbd-matrix" compatible.

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

         * - Name
           - Type
           - Details

         * - ``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``
           - ``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.



             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.