1 * Texas Instruments - LM3697 Highly Efficient 1 * Texas Instruments - LM3697 Highly Efficient White LED Driver
2 2
3 The LM3697 11-bit LED driver provides high- 3 The LM3697 11-bit LED driver provides high-
4 performance backlight dimming for 1, 2, or 3 s 4 performance backlight dimming for 1, 2, or 3 series
5 LED strings while delivering up to 90% efficie 5 LED strings while delivering up to 90% efficiency.
6 6
7 This device is suitable for display and keypad 7 This device is suitable for display and keypad lighting
8 8
9 Required properties: 9 Required properties:
10 - compatible: 10 - compatible:
11 "ti,lm3697" 11 "ti,lm3697"
12 - reg : I2C slave address 12 - reg : I2C slave address
13 - #address-cells : 1 13 - #address-cells : 1
14 - #size-cells : 0 14 - #size-cells : 0
15 15
16 Optional properties: 16 Optional properties:
17 - enable-gpios : GPIO pin to enable/di 17 - enable-gpios : GPIO pin to enable/disable the device
18 - vled-supply : LED supply 18 - vled-supply : LED supply
19 19
20 Required child properties: 20 Required child properties:
21 - reg : 0 - LED is Controlled by bank 21 - reg : 0 - LED is Controlled by bank A
22 1 - LED is Controlled by bank 22 1 - LED is Controlled by bank B
23 - led-sources : Indicates which HVLED 23 - led-sources : Indicates which HVLED string is associated to which
24 control bank. This is 24 control bank. This is a zero based property so
25 HVLED1 = 0, HVLED2 = 1 25 HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
26 Additional information 26 Additional information is contained
27 in Documentation/devic 27 in Documentation/devicetree/bindings/leds/common.txt
28 28
29 Optional child properties: 29 Optional child properties:
30 - ti,brightness-resolution - see Docum 30 - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
31 - ramp-up-us: see Documentation/device 31 - ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
32 - ramp-down-us: see Documentation/devi 32 - ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
33 - label : see Documentation/devicetree 33 - label : see Documentation/devicetree/bindings/leds/common.txt
34 - linux,default-trigger : 34 - linux,default-trigger :
35 see Documentation/devicetree/bindin 35 see Documentation/devicetree/bindings/leds/common.txt
36 36
37 Example: 37 Example:
38 38
39 HVLED string 1 and 3 are controlled by control 39 HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
40 controlled by control bank B. 40 controlled by control bank B.
41 41
42 led-controller@36 { 42 led-controller@36 {
43 compatible = "ti,lm3697"; 43 compatible = "ti,lm3697";
44 #address-cells = <1>; 44 #address-cells = <1>;
45 #size-cells = <0>; 45 #size-cells = <0>;
46 reg = <0x36>; 46 reg = <0x36>;
47 47
48 enable-gpios = <&gpio1 28 GPIO_ACTIVE_ 48 enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
49 vled-supply = <&vbatt>; 49 vled-supply = <&vbatt>;
50 50
51 led@0 { 51 led@0 {
52 reg = <0>; 52 reg = <0>;
53 led-sources = <0 2>; 53 led-sources = <0 2>;
54 ti,brightness-resolution = <20 54 ti,brightness-resolution = <2047>;
55 ramp-up-us = <5000>; 55 ramp-up-us = <5000>;
56 ramp-down-us = <1000>; 56 ramp-down-us = <1000>;
57 label = "white:first_backlight 57 label = "white:first_backlight_cluster";
58 linux,default-trigger = "backl 58 linux,default-trigger = "backlight";
59 }; 59 };
60 60
61 led@1 { 61 led@1 {
62 reg = <1>; 62 reg = <1>;
63 led-sources = <1>; 63 led-sources = <1>;
64 ti,brightness-resolution = <25 64 ti,brightness-resolution = <255>;
65 ramp-up-us = <500>; 65 ramp-up-us = <500>;
66 ramp-down-us = <1000>; 66 ramp-down-us = <1000>;
67 label = "white:second_backligh 67 label = "white:second_backlight_cluster";
68 linux,default-trigger = "backl 68 linux,default-trigger = "backlight";
69 }; 69 };
70 } 70 }
71 71
72 For more product information please see the li 72 For more product information please see the link below:
73 https://www.ti.com/lit/ds/symlink/lm3697.pdf 73 https://www.ti.com/lit/ds/symlink/lm3697.pdf
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