74 lines
2.0 KiB
Plaintext
74 lines
2.0 KiB
Plaintext
|
* Texas Instruments - LM3697 Highly Efficient White LED Driver
|
||
|
|
|
||
|
|
The LM3697 11-bit LED driver provides high-
|
||
|
|
performance backlight dimming for 1, 2, or 3 series
|
||
|
|
LED strings while delivering up to 90% efficiency.
|
||
|
|
|
||
|
|
This device is suitable for display and keypad lighting
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible:
|
||
|
|
"ti,lm3697"
|
||
|
|
- reg : I2C slave address
|
||
|
|
- #address-cells : 1
|
||
|
|
- #size-cells : 0
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
- enable-gpios : GPIO pin to enable/disable the device
|
||
|
|
- vled-supply : LED supply
|
||
|
|
|
||
|
|
Required child properties:
|
||
|
|
- reg : 0 - LED is Controlled by bank A
|
||
|
|
1 - LED is Controlled by bank B
|
||
|
|
- led-sources : Indicates which HVLED string is associated to which
|
||
|
|
control bank. This is a zero based property so
|
||
|
|
HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
|
||
|
|
Additional information is contained
|
||
|
|
in Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
|
||
|
|
Optional child properties:
|
||
|
|
- ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
|
||
|
|
- ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
|
||
|
|
- ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
|
||
|
|
- label : see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
- linux,default-trigger :
|
||
|
|
see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
|
||
|
|
controlled by control bank B.
|
||
|
|
|
||
|
|
led-controller@36 {
|
||
|
|
compatible = "ti,lm3697";
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
reg = <0x36>;
|
||
|
|
|
||
|
|
enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
|
||
|
|
vled-supply = <&vbatt>;
|
||
|
|
|
||
|
|
led@0 {
|
||
|
|
reg = <0>;
|
||
|
|
led-sources = <0 2>;
|
||
|
|
ti,brightness-resolution = <2047>;
|
||
|
|
ramp-up-us = <5000>;
|
||
|
|
ramp-down-us = <1000>;
|
||
|
|
label = "white:first_backlight_cluster";
|
||
|
|
linux,default-trigger = "backlight";
|
||
|
|
};
|
||
|
|
|
||
|
|
led@1 {
|
||
|
|
reg = <1>;
|
||
|
|
led-sources = <1>;
|
||
|
|
ti,brightness-resolution = <255>;
|
||
|
|
ramp-up-us = <500>;
|
||
|
|
ramp-down-us = <1000>;
|
||
|
|
label = "white:second_backlight_cluster";
|
||
|
|
linux,default-trigger = "backlight";
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
For more product information please see the link below:
|
||
|
|
https://www.ti.com/lit/ds/symlink/lm3697.pdf
|