1 * Texas Instruments LM36274 4-Channel LCD Back 1 * Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
2 2
3 The LM36274 is an integrated four-channel WLED 3 The LM36274 is an integrated four-channel WLED driver and LCD bias supply.
4 The backlight boost provides the power to bias 4 The backlight boost provides the power to bias four parallel LED strings with
5 up to 29V total output voltage. The 11-bit LED 5 up to 29V total output voltage. The 11-bit LED current is programmable via
6 the I2C bus and/or controlled via a logic leve 6 the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA.
7 7
8 Parent device properties are documented in 8 Parent device properties are documented in
9 Documentation/devicetree/bindings/mfd/ti-lmu.t 9 Documentation/devicetree/bindings/mfd/ti-lmu.txt
10 10
11 Regulator properties are documented in 11 Regulator properties are documented in
12 Documentation/devicetree/bindings/regulator/lm 12 Documentation/devicetree/bindings/regulator/lm363x-regulator.txt
13 13
14 Required backlight properties: 14 Required backlight properties:
15 - compatible: 15 - compatible:
16 "ti,lm36274-backlight" 16 "ti,lm36274-backlight"
17 - reg : 0 17 - reg : 0
18 - #address-cells : 1 18 - #address-cells : 1
19 - #size-cells : 0 19 - #size-cells : 0
20 - led-sources : Indicates which LED st 20 - led-sources : Indicates which LED strings will be enabled.
21 Values from 0-3, sourc 21 Values from 0-3, sources is 0 based so strings will be
22 source value + 1. 22 source value + 1.
23 23
24 Optional backlight properties: 24 Optional backlight properties:
25 - label : see Documentation/devicetree 25 - label : see Documentation/devicetree/bindings/leds/common.txt
26 - linux,default-trigger : 26 - linux,default-trigger :
27 see Documentation/devicetree/bindin 27 see Documentation/devicetree/bindings/leds/common.txt
28 28
29 Example: 29 Example:
30 30
31 HVLED string 1 and 3 are controlled by control 31 HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
32 controlled by control bank B. 32 controlled by control bank B.
33 33
34 lm36274@11 { 34 lm36274@11 {
35 compatible = "ti,lm36274"; 35 compatible = "ti,lm36274";
36 #address-cells = <1>; 36 #address-cells = <1>;
37 #size-cells = <0>; 37 #size-cells = <0>;
38 reg = <0x11>; 38 reg = <0x11>;
39 39
40 enable-gpios = <&gpio1 28 GPIO_ACTIVE_ 40 enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
41 41
42 regulators { 42 regulators {
43 #address-cells = <1>; 43 #address-cells = <1>;
44 #size-cells = <0>; 44 #size-cells = <0>;
45 compatible = "ti,lm363x-regula 45 compatible = "ti,lm363x-regulator";
46 46
47 enable-gpios = <&pioC 0 GPIO_A 47 enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
48 <&pioC 1 GPIO_A 48 <&pioC 1 GPIO_ACTIVE_HIGH>;
49 49
50 vboost { 50 vboost {
51 regulator-name = "lcd_ 51 regulator-name = "lcd_boost";
52 regulator-min-microvol 52 regulator-min-microvolt = <4000000>;
53 regulator-max-microvol 53 regulator-max-microvolt = <7150000>;
54 regulator-always-on; 54 regulator-always-on;
55 }; 55 };
56 56
57 vpos { 57 vpos {
58 regulator-name = "lcd_ 58 regulator-name = "lcd_vpos";
59 regulator-min-microvol 59 regulator-min-microvolt = <4000000>;
60 regulator-max-microvol 60 regulator-max-microvolt = <6500000>;
61 }; 61 };
62 62
63 vneg { 63 vneg {
64 regulator-name = "lcd_ 64 regulator-name = "lcd_vneg";
65 regulator-min-microvol 65 regulator-min-microvolt = <4000000>;
66 regulator-max-microvol 66 regulator-max-microvolt = <6500000>;
67 }; 67 };
68 }; 68 };
69 69
70 backlight { 70 backlight {
71 #address-cells = <1>; 71 #address-cells = <1>;
72 #size-cells = <0>; 72 #size-cells = <0>;
73 compatible = "ti,lm36274-backl 73 compatible = "ti,lm36274-backlight";
74 74
75 led@0 { 75 led@0 {
76 reg = <0>; 76 reg = <0>;
77 led-sources = <0 2>; 77 led-sources = <0 2>;
78 label = "white:backlig 78 label = "white:backlight_cluster";
79 linux,default-trigger 79 linux,default-trigger = "backlight";
80 }; 80 };
81 }; 81 };
82 }; 82 };
83 83
84 For more product information please see the li 84 For more product information please see the link below:
85 https://www.ti.com/lit/ds/symlink/lm36274.pdf 85 https://www.ti.com/lit/ds/symlink/lm36274.pdf
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