| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | * Texas Instruments - LM3697 Highly Efficient White LED Driver |
| 2 | |
| 3 | The LM3697 11-bit LED driver provides high- |
| 4 | performance backlight dimming for 1, 2, or 3 series |
| 5 | LED strings while delivering up to 90% efficiency. |
| 6 | |
| 7 | This device is suitable for display and keypad lighting |
| 8 | |
| 9 | Required properties: |
| 10 | - compatible: |
| 11 | "ti,lm3697" |
| 12 | - reg : I2C slave address |
| 13 | - #address-cells : 1 |
| 14 | - #size-cells : 0 |
| 15 | |
| 16 | Optional properties: |
| 17 | - enable-gpios : GPIO pin to enable/disable the device |
| 18 | - vled-supply : LED supply |
| 19 | |
| 20 | Required child properties: |
| 21 | - reg : 0 - LED is Controlled by bank A |
| 22 | 1 - LED is Controlled by bank B |
| 23 | - led-sources : Indicates which HVLED string is associated to which |
| 24 | control bank. This is a zero based property so |
| 25 | HVLED1 = 0, HVLED2 = 1, HVLED3 = 2. |
| 26 | Additional information is contained |
| 27 | in Documentation/devicetree/bindings/leds/common.txt |
| 28 | |
| 29 | Optional child properties: |
| 30 | - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt |
| 31 | - ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt |
| 32 | - ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt |
| 33 | - label : see Documentation/devicetree/bindings/leds/common.txt |
| 34 | - linux,default-trigger : |
| 35 | see Documentation/devicetree/bindings/leds/common.txt |
| 36 | |
| 37 | Example: |
| 38 | |
| 39 | HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is |
| 40 | controlled by control bank B. |
| 41 | |
| 42 | led-controller@36 { |
| 43 | compatible = "ti,lm3697"; |
| 44 | #address-cells = <1>; |
| 45 | #size-cells = <0>; |
| 46 | reg = <0x36>; |
| 47 | |
| 48 | enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>; |
| 49 | vled-supply = <&vbatt>; |
| 50 | |
| 51 | led@0 { |
| 52 | reg = <0>; |
| 53 | led-sources = <0 2>; |
| 54 | ti,brightness-resolution = <2047>; |
| 55 | ramp-up-us = <5000>; |
| 56 | ramp-down-us = <1000>; |
| 57 | label = "white:first_backlight_cluster"; |
| 58 | linux,default-trigger = "backlight"; |
| 59 | }; |
| 60 | |
| 61 | led@1 { |
| 62 | reg = <1>; |
| 63 | led-sources = <1>; |
| 64 | ti,brightness-resolution = <255>; |
| 65 | ramp-up-us = <500>; |
| 66 | ramp-down-us = <1000>; |
| 67 | label = "white:second_backlight_cluster"; |
| 68 | linux,default-trigger = "backlight"; |
| 69 | }; |
| 70 | } |
| 71 | |
| 72 | For more product information please see the link below: |
| 73 | https://www.ti.com/lit/ds/symlink/lm3697.pdf |