1*4882a593Smuzhiyun* Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunThe LM36274 is an integrated four-channel WLED driver and LCD bias supply. 4*4882a593SmuzhiyunThe backlight boost provides the power to bias four parallel LED strings with 5*4882a593Smuzhiyunup to 29V total output voltage. The 11-bit LED current is programmable via 6*4882a593Smuzhiyunthe I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA. 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunParent device properties are documented in 9*4882a593SmuzhiyunDocumentation/devicetree/bindings/mfd/ti-lmu.txt 10*4882a593Smuzhiyun 11*4882a593SmuzhiyunRegulator properties are documented in 12*4882a593SmuzhiyunDocumentation/devicetree/bindings/regulator/lm363x-regulator.txt 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunRequired backlight properties: 15*4882a593Smuzhiyun - compatible: 16*4882a593Smuzhiyun "ti,lm36274-backlight" 17*4882a593Smuzhiyun - reg : 0 18*4882a593Smuzhiyun - #address-cells : 1 19*4882a593Smuzhiyun - #size-cells : 0 20*4882a593Smuzhiyun - led-sources : Indicates which LED strings will be enabled. 21*4882a593Smuzhiyun Values from 0-3, sources is 0 based so strings will be 22*4882a593Smuzhiyun source value + 1. 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunOptional backlight properties: 25*4882a593Smuzhiyun - label : see Documentation/devicetree/bindings/leds/common.txt 26*4882a593Smuzhiyun - linux,default-trigger : 27*4882a593Smuzhiyun see Documentation/devicetree/bindings/leds/common.txt 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunExample: 30*4882a593Smuzhiyun 31*4882a593SmuzhiyunHVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is 32*4882a593Smuzhiyuncontrolled by control bank B. 33*4882a593Smuzhiyun 34*4882a593Smuzhiyunlm36274@11 { 35*4882a593Smuzhiyun compatible = "ti,lm36274"; 36*4882a593Smuzhiyun #address-cells = <1>; 37*4882a593Smuzhiyun #size-cells = <0>; 38*4882a593Smuzhiyun reg = <0x11>; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>; 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun regulators { 43*4882a593Smuzhiyun #address-cells = <1>; 44*4882a593Smuzhiyun #size-cells = <0>; 45*4882a593Smuzhiyun compatible = "ti,lm363x-regulator"; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>, 48*4882a593Smuzhiyun <&pioC 1 GPIO_ACTIVE_HIGH>; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun vboost { 51*4882a593Smuzhiyun regulator-name = "lcd_boost"; 52*4882a593Smuzhiyun regulator-min-microvolt = <4000000>; 53*4882a593Smuzhiyun regulator-max-microvolt = <7150000>; 54*4882a593Smuzhiyun regulator-always-on; 55*4882a593Smuzhiyun }; 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun vpos { 58*4882a593Smuzhiyun regulator-name = "lcd_vpos"; 59*4882a593Smuzhiyun regulator-min-microvolt = <4000000>; 60*4882a593Smuzhiyun regulator-max-microvolt = <6500000>; 61*4882a593Smuzhiyun }; 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun vneg { 64*4882a593Smuzhiyun regulator-name = "lcd_vneg"; 65*4882a593Smuzhiyun regulator-min-microvolt = <4000000>; 66*4882a593Smuzhiyun regulator-max-microvolt = <6500000>; 67*4882a593Smuzhiyun }; 68*4882a593Smuzhiyun }; 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun backlight { 71*4882a593Smuzhiyun #address-cells = <1>; 72*4882a593Smuzhiyun #size-cells = <0>; 73*4882a593Smuzhiyun compatible = "ti,lm36274-backlight"; 74*4882a593Smuzhiyun 75*4882a593Smuzhiyun led@0 { 76*4882a593Smuzhiyun reg = <0>; 77*4882a593Smuzhiyun led-sources = <0 2>; 78*4882a593Smuzhiyun label = "white:backlight_cluster"; 79*4882a593Smuzhiyun linux,default-trigger = "backlight"; 80*4882a593Smuzhiyun }; 81*4882a593Smuzhiyun }; 82*4882a593Smuzhiyun}; 83*4882a593Smuzhiyun 84*4882a593SmuzhiyunFor more product information please see the link below: 85*4882a593Smuzhiyunhttps://www.ti.com/lit/ds/symlink/lm36274.pdf 86