:orphan:
.. raw:: html
.. dtcompatible:: hit,hd44780
.. _dtbinding_hit_hd44780:
hit,hd44780
###########
Vendor: :ref:`Hitachi Ltd. `
Description
***********
.. code-block:: none
Hitachi HD44780 LCD
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
* - ``mode``
- ``int``
- .. code-block:: none
Operating mode of display, 8-bit or 4 for 4-bit mode
This property is **required**.
Legal values: ``4``, ``8``
* - ``register-select-gpios``
- ``phandle-array``
- .. code-block:: none
GPIO connected to Register Select (RS) of LCD
This property is **required**.
* - ``read-write-gpios``
- ``phandle-array``
- .. code-block:: none
Optional GPIO used for selecting read or write mode
* - ``enable-gpios``
- ``phandle-array``
- .. code-block:: none
GPIO used for enabling commands to be sent
This property is **required**.
* - ``data-bus-gpios``
- ``phandle-array``
- .. code-block:: none
Array of GPIOs connected to the DB lines of the display, this must
contain 8 entries ascending from DB0 to DB7, for 4-bit interface
displays, the first 4 must be set as `<0>`
This property is **required**.
* - ``brightness-gpios``
- ``phandle-array``
- .. code-block:: none
Optional GPIO used for controlling the brightness (contrast)
* - ``backlight-gpios``
- ``phandle-array``
- .. code-block:: none
Optional GPIO used for enabling the backlight
* - ``line-addresses``
- ``uint8-array``
- .. code-block:: none
Array of addresses for each row, will use defaults if not provided.
Default is as per Hitachi HD44780 specification.
Default value: ``[0, 64, 20, 84]``
* - ``enable-line-rise-delay-us``
- ``int``
- .. code-block:: none
Delay time (in us) to wait after enable line rises before setting low.
Default is as per Hitachi HD44780 specification.
Default value: ``800``
* - ``enable-line-fall-delay-us``
- ``int``
- .. code-block:: none
Delay time (in us) to wait after enable line falls before sending
another command. Default is as per Hitachi HD44780 specification.
Default value: ``100``
* - ``clear-command-delay-us``
- ``int``
- .. code-block:: none
Delay time (in us) to wait after issuing a clear command before sending
another command. Default is as per Hitachi HD44780 specification.
Default value: ``5000``
* - ``boot-delay-ms``
- ``int``
- .. code-block:: none
Delay time (in ms) to wait at boot time before sending a command (note:
this will delay startup of the whole application by this time, this
should only be used when time is needed for the display device to be
ready before it can be configured which without any delay would cause
the display to not function properly).
* - ``columns``
- ``int``
- .. code-block:: none
Number of text columns that the display has
This property is **required**.
* - ``rows``
- ``int``
- .. code-block:: none
Number of text rows that the display has
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 "hit,hd44780" compatible.
.. list-table::
:widths: 1 1 4
:header-rows: 1
* - Name
- Type
- Details
* - ``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
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
* - ``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.