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nordic,nrf-led-matrix

Vendor: Nordic Semiconductor

Description

Generic LED matrix driven by nRF SoC GPIOs

Properties

Node specific properties

Deprecated node specific properties

Base properties

Properties not inherited from the base binding file.

Name

Type

Details

row-gpios

phandle-array

 
Array of GPIOs to be used as rows of the matrix.

This property is required.

col-gpios

phandle-array

 
Array of GPIOs to be used as columns of the matrix.

This property is required.

pixel-mapping

uint8-array

 
Array of bytes that specify which rows and columns of the matrix
control its particular pixels, line by line. Each byte in this
array corresponds to one pixel of the matrix and specifies the row
index in the high nibble and the column index in the low nibble.

For example, the following snippet (from the bbc_microbit board DTS):

  width = <5>;
  height = <5>;
  pixel-mapping = [00 13 01 14 02
                   23 24 25 26 27
                   ...

specifies that:
- pixel (0,0) is controlled by row 0 and column 0
- pixel (1,0) is controlled by row 1 and column 3
- pixel (0,1) is controlled by row 2 and column 3
- pixel (1,1) is controlled by row 2 and column 4
and so on.

This property is required.

refresh-frequency

int

 
Frequency of refreshing the matrix, in Hz.

This property is required.

timer

phandle

 
Reference to a TIMER instance for controlling refreshing of the matrix.

This property is required.

pwm

phandle

 
Reference to a PWM instance for generating pulse signals on column
GPIOs. If not provided, GPIOTE and PPI channels are allocated and
used instead for generating those pulses.

pixel-group-size

int

 
This value specifies the maximum number of LEDs in one row that can
be lit simultaneously.
If set to 1, only a single LED is turned on in a particular time slot.
Bigger values increase the maximum achievable brightness of the LEDs
and lower the CPU load by decreasing the frequency of execution of
the timer interrupt handler.
In case GPIOTE and PPI channels are used for generating the pixel pulse
signals, the number of channels that need to be allocated is equal to
this value.
If GPIOTE and PPI channels are used, the upper limit for the value is
defined by the number of CC channels in the used timer minus one.
If PWM is used, the upper limit is the number of PWM channels.

This property is required.

height

int

 
Height of the panel driven by the controller, with the units in pixels.

This property is required.

width

int

 
Width of the panel driven by the controller, with the units in pixels.

This property is required.

Deprecated properties not inherited from the base binding file.

(None)

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 “nordic,nrf-led-matrix” compatible.

Name

Type

Details

label

string

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

This property is required.

See Important properties for more information.

status

string

 
indicates the operational status of a device

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

See Important properties for more information.

compatible

string-array

 
compatible strings

This property is required.

See Important properties for more information.

reg

array

 
register space

See Important properties for more information.

reg-names

string-array

 
name of each register space

interrupts

array

 
interrupts for device

See Important properties for more information.

interrupts-extended

compound

 
extended interrupt specifier for device

interrupt-names

string-array

 
name of each interrupt

interrupt-parent

phandle

 
phandle to interrupt controller node

clocks

phandle-array

 
Clock gate information

clock-names

string-array

 
name of each clock

#address-cells

int

 
number of address cells in reg property

#size-cells

int

 
number of size cells in reg property

dmas

phandle-array

 
DMA channels specifiers

dma-names

string-array

 
Provided names of DMA channel specifiers

io-channels

phandle-array

 
IO channels specifiers

io-channel-names

string-array

 
Provided names of IO channel specifiers

mboxes

phandle-array

 
mailbox / IPM channels specifiers

mbox-names

string-array

 
Provided names of mailbox / IPM channel specifiers

wakeup-source

boolean

 
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

 
Power domain the device belongs to.

The device will be notified when the power domain it belongs to is either
suspended or resumed.