projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 84b5def4 IK |
1 | * Kinetic Technologies - KTD2692 Flash LED Driver |
| 2 | ||
| 3 | KTD2692 is the ideal power solution for high-power flash LEDs. | |
| 4 | It uses ExpressWire single-wire programming for maximum flexibility. | |
| 5 | ||
| 6 | The ExpressWire interface through CTRL pin can control LED on/off and | |
| 7 | enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode current, | |
| 8 | Flash timeout, LVP(low voltage protection). | |
| 9 | ||
| 10 | Also, When the AUX pin is pulled high while CTRL pin is high, | |
| 11 | LED current will be ramped up to the flash-mode current level. | |
| 12 | ||
| 13 | Required properties: | |
| 14 | - compatible : Should be "kinetic,ktd2692". | |
| 15 | - ctrl-gpios : Specifier of the GPIO connected to CTRL pin. | |
| 16 | - aux-gpios : Specifier of the GPIO connected to AUX pin. | |
| 17 | ||
| 18 | Optional properties: | |
| 19 | - vin-supply : "vin" LED supply (2.7V to 5.5V). | |
| 20 | See Documentation/devicetree/bindings/regulator/regulator.txt | |
| 21 | ||
| 22 | A discrete LED element connected to the device must be represented by a child | |
| 23 | node - See Documentation/devicetree/bindings/leds/common.txt | |
| 24 | ||
| 25 | Required properties for flash LED child nodes: | |
| 26 | See Documentation/devicetree/bindings/leds/common.txt | |
| 27 | - led-max-microamp : Minimum Threshold for Timer protection | |
| 28 | is defined internally (Maximum 300mA). | |
| 29 | - flash-max-microamp : Flash LED maximum current | |
| 30 | Formula : I(mA) = 15000 / Rset. | |
| 31 | - flash-max-timeout-us : Flash LED maximum timeout. | |
| 32 | ||
| 33 | Optional properties for flash LED child nodes: | |
| 34 | - label : See Documentation/devicetree/bindings/leds/common.txt | |
| 35 | ||
| 36 | Example: | |
| 37 | ||
| 38 | ktd2692 { | |
| 39 | compatible = "kinetic,ktd2692"; | |
| 40 | ctrl-gpios = <&gpc0 1 0>; | |
| 41 | aux-gpios = <&gpc0 2 0>; | |
| 42 | vin-supply = <&vbat>; | |
| 43 | ||
| 44 | flash-led { | |
| 45 | label = "ktd2692-flash"; | |
| 46 | led-max-microamp = <300000>; | |
| 47 | flash-max-microamp = <1500000>; | |
| 48 | flash-max-timeout-us = <1835000>; | |
| 49 | }; | |
| 50 | }; |