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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
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treea94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/leds/leds-lm3697.txt
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Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+* Texas Instruments - LM3697 Highly Efficient White LED Driver
+
+The LM3697 11-bit LED driver provides high-
+performance backlight dimming for 1, 2, or 3 series
+LED strings while delivering up to 90% efficiency.
+
+This device is suitable for display and keypad lighting
+
+Required properties:
+ - compatible:
+ "ti,lm3697"
+ - reg : I2C slave address
+ - #address-cells : 1
+ - #size-cells : 0
+
+Optional properties:
+ - enable-gpios : GPIO pin to enable/disable the device
+ - vled-supply : LED supply
+
+Required child properties:
+ - reg : 0 - LED is Controlled by bank A
+ 1 - LED is Controlled by bank B
+ - led-sources : Indicates which HVLED string is associated to which
+ control bank. This is a zero based property so
+ HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
+ Additional information is contained
+ in Documentation/devicetree/bindings/leds/common.txt
+
+Optional child properties:
+ - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+ - ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+ - ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+ - label : see Documentation/devicetree/bindings/leds/common.txt
+ - linux,default-trigger :
+ see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
+controlled by control bank B.
+
+led-controller@36 {
+ compatible = "ti,lm3697";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x36>;
+
+ enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+ vled-supply = <&vbatt>;
+
+ led@0 {
+ reg = <0>;
+ led-sources = <0 2>;
+ ti,brightness-resolution = <2047>;
+ ramp-up-us = <5000>;
+ ramp-down-us = <1000>;
+ label = "white:first_backlight_cluster";
+ linux,default-trigger = "backlight";
+ };
+
+ led@1 {
+ reg = <1>;
+ led-sources = <1>;
+ ti,brightness-resolution = <255>;
+ ramp-up-us = <500>;
+ ramp-down-us = <1000>;
+ label = "white:second_backlight_cluster";
+ linux,default-trigger = "backlight";
+ };
+}
+
+For more product information please see the link below:
+https://www.ti.com/lit/ds/symlink/lm3697.pdf