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leds: ktd2692: add device tree bindings for ktd2692

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This patch adds the device tree bindings for ktd2692 flash LEDs.
Add Optional properties of child node for Flash LED

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Reviewed-by: Varka Bhadram <varkabhadram@gmail.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
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Ingi Kim 2015-05-12 01:37:56 -07:00 committed by Bryan Wu
parent d4855eeb9f
commit 84b5def48f
1 changed files with 50 additions and 0 deletions
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Documentation/devicetree/bindings/leds/leds-ktd2692.txt Normal file
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* 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>;
};
};