From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacek Anaszewski Subject: [PATCH/RFC v11 13/20] DT: Add documentation for the Skyworks AAT1290 Date: Wed, 18 Feb 2015 17:20:34 +0100 Message-ID: <1424276441-3969-14-git-send-email-j.anaszewski@samsung.com> References: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> Return-path: In-reply-to: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> Sender: linux-media-owner@vger.kernel.org To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org Cc: kyungmin.park@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski List-Id: devicetree@vger.kernel.org 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 Cc: Bryan Wu Cc: Richard Purdie --- .../devicetree/bindings/leds/leds-aat1290.txt | 43 ++++++++++++++++++++ 1 file changed, 43 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 0000000..78aa7da --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,43 @@ +* 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. In order to add a capability of selecting the strobe signal source +(e.g. GPIO or camera sensor) there is an additional switch required, independent +of the flash chip. + +Such a switch is provided on the exynos4412-trats2 board. The switch is +configured so that it is possible to change EN_SET and FL_EN signal sources +simultaneously with one GPIO. This gpio can be provided in the third element +of 'gpios ' property. + +Required properties: + +- compatible : Must be "skyworks,aat1290". +- gpios : Two gpio pins in order FLEN, EN/SET, and optional third + HW_FLASH_EN gpio for controlling the HW_FLASH_SW mux. + +The LED 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: +- label : see Documentation/devicetree/bindings/leds/common.txt +- flash-max-microamp : Maximum intensity in microamperes of the flash LED - + it can be calculated using following formula: + I = 1A * 162kohm / Rset +- flash-timeout-us : Maximum flash timeout in microseconds - + it can be calculated using following formula: + T = 8.82 * 10^9 * Ct. + +Example (by Ct = 220nF, Rset = 160kohm) + +aat1290 { + compatible = "skyworks,aat1290"; + gpios = <&gpj1 1 0>, <&gpj1 2 0>, <&gpj1 0 0>; + + camera_flash: flash-led { + label = "aat1290-flash"; + flash-max-microamp = <1012500> + flash-timeout-us = <1940000>; + }; +}; -- 1.7.9.5