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DT: Add documentation for the Skyworks AAT1290

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This patch adds device tree binding documentation for
1.5A Step-Up Current Regulator for Flash LEDs.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: devicetree@vger.kernel.org
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Jacek Anaszewski 2015-04-28 00:18:44 -07:00 committed by Bryan Wu
parent a43f6a86ad
commit 2269fe0931
1 changed files with 41 additions and 0 deletions
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Documentation/devicetree/bindings/leds/leds-aat1290.txt Normal file
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* Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
The device is controlled through two pins: FL_EN and EN_SET. The pins when,
asserted high, enable flash strobe and movie mode (max 1/2 of flash current)
respectively.
Required properties:
- compatible : Must be "skyworks,aat1290".
- flen-gpios : Must be device tree identifier of the flash device FL_EN pin.
- enset-gpios : Must be device tree identifier of the flash device EN_SET pin.
A discrete LED element connected to the device must be represented by a child
node - see Documentation/devicetree/bindings/leds/common.txt.
Required properties of the LED child node:
- led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
Maximum flash LED supply current can be calculated using
following formula: I = 1A * 162kohm / Rset.
- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
Maximum flash timeout can be calculated using following
formula: T = 8.82 * 10^9 * Ct.
Optional properties of the LED child node:
- label : see Documentation/devicetree/bindings/leds/common.txt
Example (by Ct = 220nF, Rset = 160kohm):
aat1290 {
compatible = "skyworks,aat1290";
flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
camera_flash: flash-led {
label = "aat1290-flash";
led-max-microamp = <520833>;
flash-max-microamp = <1012500>;
flash-timeout-us = <1940000>;
};
};