0001 * Texas Instruments - LM3697 Highly Efficient White LED Driver
0002
0003 The LM3697 11-bit LED driver provides high-
0004 performance backlight dimming for 1, 2, or 3 series
0005 LED strings while delivering up to 90% efficiency.
0006
0007 This device is suitable for display and keypad lighting
0008
0009 Required properties:
0010 - compatible:
0011 "ti,lm3697"
0012 - reg : I2C slave address
0013 - #address-cells : 1
0014 - #size-cells : 0
0015
0016 Optional properties:
0017 - enable-gpios : GPIO pin to enable/disable the device
0018 - vled-supply : LED supply
0019
0020 Required child properties:
0021 - reg : 0 - LED is Controlled by bank A
0022 1 - LED is Controlled by bank B
0023 - led-sources : Indicates which HVLED string is associated to which
0024 control bank. This is a zero based property so
0025 HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
0026 Additional information is contained
0027 in Documentation/devicetree/bindings/leds/common.txt
0028
0029 Optional child properties:
0030 - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
0031 - ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
0032 - ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
0033 - label : see Documentation/devicetree/bindings/leds/common.txt
0034 - linux,default-trigger :
0035 see Documentation/devicetree/bindings/leds/common.txt
0036
0037 Example:
0038
0039 HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
0040 controlled by control bank B.
0041
0042 led-controller@36 {
0043 compatible = "ti,lm3697";
0044 #address-cells = <1>;
0045 #size-cells = <0>;
0046 reg = <0x36>;
0047
0048 enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
0049 vled-supply = <&vbatt>;
0050
0051 led@0 {
0052 reg = <0>;
0053 led-sources = <0 2>;
0054 ti,brightness-resolution = <2047>;
0055 ramp-up-us = <5000>;
0056 ramp-down-us = <1000>;
0057 label = "white:first_backlight_cluster";
0058 linux,default-trigger = "backlight";
0059 };
0060
0061 led@1 {
0062 reg = <1>;
0063 led-sources = <1>;
0064 ti,brightness-resolution = <255>;
0065 ramp-up-us = <500>;
0066 ramp-down-us = <1000>;
0067 label = "white:second_backlight_cluster";
0068 linux,default-trigger = "backlight";
0069 };
0070 }
0071
0072 For more product information please see the link below:
0073 https://www.ti.com/lit/ds/symlink/lm3697.pdf
