On Thu, 23 Apr 2015 22:18:04 +0900
Hi Ingi,
Ingi Kim <ingi2.kim@xxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxx>
> Acked-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/leds/leds-ktd2692.txt | 47
> ++++++++++++++++++++++ 1 file changed, 47 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/leds/leds-ktd2692.txt
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt new file
> mode 100644 index 0000000..708f2d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> @@ -0,0 +1,47 @@
> +* 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: "kinetic,ktd2692"
> +- ctrl-gpio : gpio pin in order control CTRL pin
> +- aux-gpio : gpio pin in order control 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
> +- flash-max-microamp : Flash LED maximum current
> + Formula : I(mA) = 15000 / Rset
> +- flash-max-timeout-us : Flash LED maximum timeout
Patch [1] makes the led-max-microamp property mandatory for
the LEDs with configurable current for non-flash modes.
It hasn't been merged yet as we are waiting for ack from DT maintainer.
> +
> +Optional properties for flash LED child nodes:
> +- label : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +ktd2692 {
> + compatible = "kinetic,ktd2692";
> + ctrl-gpio = <&gpc0 1 0>;
> + aux-gpio = <&gpc0 2 0>;
> + vin-supply = <&vbat>;
> +
> + flash-led {
> + label = "ktd2692-flash";
> + flash-max-microamp = <1500000>;
> + flash-max-timeout-us = <1835000>;
> + };
> +};
[1] [PATCH v6] DT: leds: Improve description of flash LEDs related
properties
--
Best Regards,
Jacek Anaszewski
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