dac-leds

Note

An implementation of a driver matching this compatible is available in drivers/led/led_dac.c.

Description

Group of DAC-controlled LEDs.

Each LED is defined in a child node of the dac-leds node.

Here is an example which defines an LED in the node /leds:

/ {
        leds {
                compatible = "dac-leds";
                led_0 {
                        dac-dev = <&dac1>;
                        channel = <0>;
                        resolution = <12>;
                };
                led_1 {
                        dac-dev = <&dac1>;
                        channel = <1>;
                        resolution = <12>;
                        voltage-min-brightness-mv = <1400>;
                        voltage-max-brightness-mv = <2700>;
                        voltage-max-dac-mv = <3300>;
                        output-buffer;
                };
        };
};

Above:

- led_0 uses dac1 channel 0 with 12 bit resolution.
- led_1 uses dac1 channel 1 with 12 bit resolution and setup to supply an LED directly.

Properties

Top level properties

No top-level properties.

Child node properties

Name	Type	Details
`dac-dev`	`phandle`	Property containing phandle to DAC e.g. &dac. This property is required.
`channel`	`int`	The DAC channel. This property is required.
`resolution`	`int`	The DAC resolution to use. This property is required.
`voltage-min-brightness-mv`	`int`	Voltage at brightness 0%. If not specified the minimum DAC output voltage is used.
`voltage-max-brightness-mv`	`int`	Voltage at brightness 100%. If not specified the maximum DAC output voltage is used.
`voltage-max-dac-mv`	`int`	The DAC maximum output voltage. Required if voltage-min-brightness-mv or voltage-max-brightness-mv is set.
`output-buffer`	`boolean`	Enable the output buffer of the DAC. This is required if it is used to drive an LED directly.