forked from Minki/linux
1372bbe66a
The LM3697 is a single function LED driver. The single function LED driver needs to reside in the LED directory as a dedicated LED driver and not as a MFD device. The device does have common brightness and ramp features and those can be accomodated by a TI LMU framework. The LM3697 dt binding needs to be moved from the ti-lmu.txt and a dedicated LED dt binding needs to be added. The new LM3697 LED dt binding will then reside in the Documentation/devicetree/bindings/leds directory and follow the current LED and general bindings guidelines. Signed-off-by: Dan Murphy <dmurphy@ti.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
74 lines
2.0 KiB
Plaintext
74 lines
2.0 KiB
Plaintext
* Texas Instruments - LM3697 Highly Efficient White LED Driver
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The LM3697 11-bit LED driver provides high-
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performance backlight dimming for 1, 2, or 3 series
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LED strings while delivering up to 90% efficiency.
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This device is suitable for display and keypad lighting
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Required properties:
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- compatible:
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"ti,lm3697"
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- reg : I2C slave address
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- #address-cells : 1
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- #size-cells : 0
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Optional properties:
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- enable-gpios : GPIO pin to enable/disable the device
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- vled-supply : LED supply
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Required child properties:
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- reg : 0 - LED is Controlled by bank A
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1 - LED is Controlled by bank B
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- led-sources : Indicates which HVLED string is associated to which
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control bank. This is a zero based property so
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HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
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Additional information is contained
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in Documentation/devicetree/bindings/leds/common.txt
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Optional child properties:
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- ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
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- ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
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- ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
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- label : see Documentation/devicetree/bindings/leds/common.txt
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- linux,default-trigger :
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see Documentation/devicetree/bindings/leds/common.txt
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Example:
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HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
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controlled by control bank B.
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led-controller@36 {
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compatible = "ti,lm3697";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x36>;
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enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
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vled-supply = <&vbatt>;
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led@0 {
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reg = <0>;
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led-sources = <0 2>;
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ti,brightness-resolution = <2047>;
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ramp-up-us = <5000>;
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ramp-down-us = <1000>;
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label = "white:first_backlight_cluster";
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linux,default-trigger = "backlight";
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};
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led@1 {
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reg = <1>;
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led-sources = <1>;
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ti,brightness-resolution = <255>;
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ramp-up-us = <500>;
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ramp-down-us = <1000>;
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label = "white:second_backlight_cluster";
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linux,default-trigger = "backlight";
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};
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}
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For more product information please see the link below:
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http://www.ti.com/lit/ds/symlink/lm3697.pdf
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