| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | * Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias |
| 2 | |
| 3 | The LM36274 is an integrated four-channel WLED driver and LCD bias supply. |
| 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 current is programmable via |
| 6 | the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA. |
| 7 | |
| 8 | Parent device properties are documented in |
| 9 | Documentation/devicetree/bindings/mfd/ti-lmu.txt |
| 10 | |
| 11 | Regulator properties are documented in |
| 12 | Documentation/devicetree/bindings/regulator/lm363x-regulator.txt |
| 13 | |
| 14 | Required 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 | |
| 24 | Optional backlight properties: |
| 25 | - label : see Documentation/devicetree/bindings/leds/common.txt |
| 26 | - linux,default-trigger : |
| 27 | see Documentation/devicetree/bindings/leds/common.txt |
| 28 | |
| 29 | Example: |
| 30 | |
| 31 | HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is |
| 32 | controlled by control bank B. |
| 33 | |
| 34 | lm36274@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 | |
| 84 | For more product information please see the link below: |
| 85 | https://www.ti.com/lit/ds/symlink/lm36274.pdf |