From 2269fe093197ade0202128cbd08d8e1c253f1fcb Mon Sep 17 00:00:00 2001 From: Jacek Anaszewski Date: Tue, 28 Apr 2015 00:18:44 -0700 Subject: [PATCH] DT: Add documentation for the Skyworks AAT1290 This patch adds device tree binding documentation for 1.5A Step-Up Current Regulator for Flash LEDs. Signed-off-by: Jacek Anaszewski Acked-by: Kyungmin Park Acked-by: Sakari Ailus Cc: Richard Purdie Cc: devicetree@vger.kernel.org Signed-off-by: Bryan Wu --- .../devicetree/bindings/leds/leds-aat1290.txt | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/leds-aat1290.txt diff --git a/Documentation/devicetree/bindings/leds/leds-aat1290.txt b/Documentation/devicetree/bindings/leds/leds-aat1290.txt new file mode 100644 index 000000000000..ef88b9c53e37 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,41 @@ +* 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>; + }; +}; -- 2.30.2