From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030310AbbCLPqe (ORCPT ); Thu, 12 Mar 2015 11:46:34 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:26353 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932082AbbCLPq2 (ORCPT ); Thu, 12 Mar 2015 11:46:28 -0400 X-AuditID: cbfee61a-f79c06d000004e71-cf-5501b4d19b8c From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@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 Subject: [PATCH/RFC v13 07/13] DT: Add documentation for the Skyworks AAT1290 Date: Thu, 12 Mar 2015 16:45:08 +0100 Message-id: <1426175114-14876-8-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1426175114-14876-1-git-send-email-j.anaszewski@samsung.com> References: <1426175114-14876-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrFLMWRmVeSWpSXmKPExsVy+t9jQd2LWxhDDZrarC2O7pzIZDH/yDlW i96rzxktzja9Ybe4vGsOm8XWN+sYLXo2bGW1uHvqKJvF7l1PWS0Ov2lntTizfyWbA7fHzll3 2T0Of13I4rFn/g9Wj74tqxg9Vqz+zu7xeZNcAFsUl01Kak5mWWqRvl0CV8b8D8oF+6QqJuw1 aWC8J9rFyMkhIWAi8arzHzOELSZx4d56ti5GLg4hgemMEuvX/2CCcNqZJGav2MEIUsUmYCjx 88VrJhBbRKBcYs+dx+wgRcwCGxglLk9oZAFJCAv4SiztbQOzWQRUJe5O3sbaxcjBwSvgITFt QQqIKSGgIDFnkg1IBaeAp0T3/Q9g44WAKiZv+Ms+gZF3ASPDKkbR1ILkguKk9FxDveLE3OLS vHS95PzcTYzgEHwmtYNxZYPFIUYBDkYlHt6KrwyhQqyJZcWVuYcYJTiYlUR4TeczhgrxpiRW VqUW5ccXleakFh9ilOZgURLnVbJvCxESSE8sSc1OTS1ILYLJMnFwSjUw1gTuazF+uz1yyUlm nfu6TBsUPDwZuaU5jz1aX/RHau9ml8S/89tk/2y7sEly17GN5yY/qu+e8lhbwpGtQOD+fd0J 5lXbL3L7JH0N59lz+8NNI1chwS8uPS3rnpz/ksUY+vX3zIze9TfVzucXHFva0D5txcnNiRIF X7pT63YfeBNqsaXj/VGPfiWW4oxEQy3mouJEAPXd9jc9AgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 | 71 ++++++++++++++++++++ 1 file changed, 71 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..b2a1192 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,71 @@ +* 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 ISP) there is an additional switch required, independent of the +flash chip. The switch is controlled with pin control. + +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. + +Optional properties: +- pinctrl-names : Must contain entries: "default", "host", "isp". Entries + "default" and "host" must refer to the same pin configuration + node, which sets the host as a strobe signal provider. Entry + "isp" must refer to the pin configuration node, which sets the + ISP as a strobe signal provider. + +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: +- 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. + +Optional properties of the LED child node: +- label : see Documentation/devicetree/bindings/leds/common.txt + +Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with +a switch that allows for routing strobe signal either from host or from ISP): + +#include "exynos4412.dtsi" + +aat1290 { + compatible = "skyworks,aat1290"; + gpios = <&gpj1 1 0>, <&gpj1 2 0>; + flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>; + enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>; + + pinctrl-names = "default", "host", "isp"; + pinctrl-0 = <&camera_flash_host>; + pinctrl-1 = <&camera_flash_host>; + pinctrl-2 = <&camera_flash_isp>; + + camera_flash: flash-led { + label = "aat1290-flash"; + flash-max-microamp = <1012500> + flash-timeout-us = <1940000>; + }; +}; + +&pinctrl_0 { + camera_flash_host: camera-flash-host { + samsung,pins = "gpj1-0"; + samsung,pin-function = <1>; + samsung,pin-val = <0>; + }; + + camera_flash_isp: camera-flash-isp { + samsung,pins = "gpj1-0"; + samsung,pin-function = <1>; + samsung,pin-val = <1>; + }; +}; -- 1.7.9.5