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- * 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
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