Kernel-4.18.0-80.el8_leds-ktd2692

published: updated: Kernel_4.18.0-80.el8_内核文档
  • Kinetic Technologies - KTD2692 Flash LED Driver

KTD2692 is the ideal power solution for high-power flash LEDs.
It uses ExpressWire single-wire programming for maximum flexibility.

The ExpressWire interface through CTRL pin can control LED on/off and
enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode current,
Flash timeout, LVP(low voltage protection).

Also, When the AUX pin is pulled high while CTRL pin is high,
LED current will be ramped up to the flash-mode current level.

Required properties:

  • compatible : Should be “kinetic,ktd2692”.
  • ctrl-gpios : Specifier of the GPIO connected to CTRL pin.
  • aux-gpios : Specifier of the GPIO connected to AUX pin.

Optional properties:

  • vin-supply : “vin” LED supply (2.7V to 5.5V).
    See Documentation/devicetree/bindings/regulator/regulator.txt

A discrete LED element connected to the device must be represented by a child
node - See Documentation/devicetree/bindings/leds/common.txt

Required properties for flash LED child nodes:
See Documentation/devicetree/bindings/leds/common.txt

  • led-max-microamp : Minimum Threshold for Timer protection
    is defined internally (Maximum 300mA).
  • flash-max-microamp : Flash LED maximum current
    Formula : I(mA) = 15000 / Rset.
  • flash-max-timeout-us : Flash LED maximum timeout.

Optional properties for flash LED child nodes:

  • label : See Documentation/devicetree/bindings/leds/common.txt

Example:

ktd2692 {
compatible = “kinetic,ktd2692”;
ctrl-gpios = <&gpc0 1 0>;
aux-gpios = <&gpc0 2 0>;
vin-supply = <&vbat>;

flash-led {
    label = "ktd2692-flash";
    led-max-microamp = <300000>;
    flash-max-microamp = <1500000>;
    flash-max-timeout-us = <1835000>;
};

};

oosTech by Sam Lee