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