:orphan:
.. raw:: html
.. dtcompatible:: sitronix,st7796s
.. _dtbinding_sitronix_st7796s:
sitronix,st7796s (on mipi-dbi bus)
##################################
Vendor: :ref:`Sitronix Technology Corporation `
.. note::
An implementation of a driver matching this compatible is available in
:zephyr_file:`drivers/display/display_st7796s.c`.
Description
***********
.. code-block:: none
ST7796S Display controller
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
* - ``frmctl1``
- ``uint8-array``
- .. code-block:: none
Frame rate control (partial mode / full colors). The default value should
result in a framerate of ~41 FPS.
Default value: ``[160, 16]``
* - ``frmctl2``
- ``uint8-array``
- .. code-block:: none
Frame rate control (idle mode / 8 colors). This property sets the
division ratio for internal clocks in idle mode
Default value: ``[0, 16]``
* - ``frmctl3``
- ``uint8-array``
- .. code-block:: none
Frame rate control (partial mode / full colors). This property sets the
division ratio for internal clocks in partial mode
Default value: ``[0, 16]``
* - ``bpc``
- ``uint8-array``
- .. code-block:: none
Blanking porch control. This sets the vertical and horizontal
front/back porch values
Default value: ``[2, 2, 0, 4]``
* - ``dfc``
- ``uint8-array``
- .. code-block:: none
Display function control. Sets display graphical ram mode, as well as
gate scan mode
Default value: ``[128, 2, 59]``
* - ``pwr1``
- ``uint8-array``
- .. code-block:: none
Power control parameter 1. Sets AVDDS, AVLCS, and VGHS
Default value: ``[128, 37]``
* - ``pwr2``
- ``int``
- .. code-block:: none
Power control parameter 2. Sets VAP
Default value: ``19``
* - ``pwr3``
- ``int``
- .. code-block:: none
Power control parameter 3. Sets source and gamma current levels
Default value: ``10``
* - ``vcmpctl``
- ``int``
- .. code-block:: none
VCOM control setting. Value starts at 0.300V, and moves upwards in
increments of 0.025V. Maximum of 1.875V
Default value: ``28``
* - ``doca``
- ``uint8-array``
- .. code-block:: none
Display output control adjust. Sets display timing controls
Default value: ``[64, 138, 0, 0, 37, 10, 56, 51]``
* - ``pgc``
- ``uint8-array``
- .. code-block:: none
Positive gamma control settings. No default is provided by controller,
as this setting is panel specific.
This property is **required**.
* - ``ngc``
- ``uint8-array``
- .. code-block:: none
Negative gamma control settings. No default is provided by controller,
as this setting is panel specific.
This property is **required**.
* - ``madctl``
- ``int``
- .. code-block:: none
Memory data access control value. This controls the panel color format,
as well as rotation settings.
* - ``color-invert``
- ``boolean``
- .. code-block:: none
When present, inverts display colors
* - ``invert-mode``
- ``string``
- .. code-block:: none
Display inversion control mode.
Default value: ``1-dot``
Legal values: ``'column'``, ``'1-dot'``, ``'2-dot'``
* - ``rgb-is-inverted``
- ``boolean``
- .. code-block:: none
Inverting color format order (RGB->BGR or BGR->RGB)
In the case of enabling this option, API reports pixel-format in capabilities
as the inverted value of the RGB pixel-format specified in MADCTL.
This option is convenient for supporting displays with bugs
where the actual color is different from the pixel format of MADCTL.
* - ``duplex``
- ``int``
- .. code-block:: none
SPI Duplex mode, full or half. By default it's always full duplex thus 0
as this is, by far, the most common mode.
Selecting half duplex allows to use SPI MOSI as a bidirectional line,
typically used when only one data line is connected.
Use the macros, not the actual enum value. Here is the concordance
list (see dt-bindings/spi/spi.h)
0 SPI_FULL_DUPLEX
2048 SPI_HALF_DUPLEX
* - ``mipi-cpol``
- ``boolean``
- .. code-block:: none
SPI clock polarity which indicates the clock idle state.
If it is used, the clock idle state is logic high; otherwise, low.
* - ``mipi-cpha``
- ``boolean``
- .. code-block:: none
SPI clock phase that indicates on which edge data is sampled.
If it is used, data is sampled on the second edge; otherwise, on the first edge.
* - ``mipi-hold-cs``
- ``boolean``
- .. code-block:: none
In some cases, it is necessary for the master to manage SPI chip select
under software control, so that multiple spi transactions can be performed
without releasing it. A typical use case is variable length SPI packets
where the first spi transaction reads the length and the second spi transaction
reads length bytes.
* - ``mipi-max-frequency``
- ``int``
- .. code-block:: none
Maximum clock frequency of device's MIPI interface in Hz
* - ``mipi-mode``
- ``string``
- .. code-block:: none
MIPI DBI mode in use. These definitions should match those in
dt-bindings/mipi_dbi/mipi_dbi.h
Legal values: ``'MIPI_DBI_MODE_SPI_3WIRE'``, ``'MIPI_DBI_MODE_SPI_4WIRE'``, ``'MIPI_DBI_MODE_6800_BUS_16_BIT'``, ``'MIPI_DBI_MODE_6800_BUS_9_BIT'``, ``'MIPI_DBI_MODE_6800_BUS_8_BIT'``, ``'MIPI_DBI_MODE_8080_BUS_16_BIT'``, ``'MIPI_DBI_MODE_8080_BUS_9_BIT'``, ``'MIPI_DBI_MODE_8080_BUS_8_BIT'``
* - ``te-mode``
- ``string``
- .. code-block:: none
MIPI DBI tearing enable signal mode. Defaults to disabled.
Default value: ``MIPI_DBI_TE_NO_EDGE``
Legal values: ``'MIPI_DBI_TE_NO_EDGE'``, ``'MIPI_DBI_TE_RISING_EDGE'``, ``'MIPI_DBI_TE_FALLING_EDGE'``
* - ``te-delay``
- ``int``
- .. code-block:: none
Delay in microseconds to wait before transmitting display data after a
tearing enable synchronization signal is seen. Defaults to 0 since most
controllers will not need a delay.
* - ``supply-gpios``
- ``phandle-array``
- .. code-block:: none
GPIO specifier that controls power to the device.
This property should be provided when the device has a dedicated
switch that controls power to the device. The supply state is
entirely the responsibility of the device driver.
Contrast with vin-supply.
* - ``vin-supply``
- ``phandle``
- .. code-block:: none
Reference to the regulator that controls power to the device.
The referenced devicetree node must have a regulator compatible.
This property should be provided when device power is supplied
by a shared regulator. The supply state is dependent on the
request status of all devices fed by the regulator.
Contrast with supply-gpios. If both properties are provided
then the regulator must be requested before the supply GPIOS is
set to an active state, and the supply GPIOS must be set to an
inactive state before releasing the regulator.
* - ``height``
- ``int``
- .. code-block:: none
Height of the panel driven by the controller, with the units in pixels.
This property is **required**.
* - ``width``
- ``int``
- .. code-block:: none
Width of the panel driven by the controller, with the units in pixels.
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 "sitronix,st7796s" 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 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 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.