worldsemi,ws2812-i2s

Vendor: Worldsemi Co., Limited

Note

An implementation of a driver matching this compatible is available in drivers/led_strip/ws2812_i2s.c.

Description

Worldsemi WS2812 LED strip, I2S binding

Driver bindings for controlling a WS2812 or compatible LED
strip with an I2S master.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

i2s-dev

phandle

 
Pointer to the I2S instance.

This property is required.

out-active-low

boolean

 
True if the output pin is active low.

nibble-one

int

 
4-bit value to shift out for a 1 pulse.

Default value: 14

nibble-zero

int

 
4-bit value to shift out for a 0 pulse.

Default value: 8

lrck-period

int

 
LRCK (left/right clock) period in microseconds.

Default value: 10

extra-wait-time

int

 
Extra microseconds to wait for the driver to flush its I2S queue.

Default value: 300

reset-delay

int

 
Minimum delay to wait (in microseconds) to make sure that the strip has
latched the signal. If omitted, a default value of 8 microseconds is used.
This default is good for the WS2812 controllers. Note that despite the
WS2812 datasheet states that a 50 microseconds delay is required, it seems
6 microseconds is enough. The default is set to 8 microseconds just to be
safe.

Default value: 8

chain-length

int

 
The number of devices in the daisy-chain.

This property is required.

color-mapping

array

 
Channel to color mapping (or pixel order).

For example a GRB channel to color mapping would be

   color-mapping = <LED_COLOR_ID_GREEN
                    LED_COLOR_ID_RED
                    LED_COLOR_ID_BLUE>;

This property is required.