From patchwork Fri Mar 27 13:49:41 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 6107241 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 307579F350 for ; Fri, 27 Mar 2015 13:50:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 775D42041F for ; Fri, 27 Mar 2015 13:50:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C4D420212 for ; Fri, 27 Mar 2015 13:50:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753189AbbC0Nub (ORCPT ); Fri, 27 Mar 2015 09:50:31 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:22310 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753185AbbC0Nu2 (ORCPT ); Fri, 27 Mar 2015 09:50:28 -0400 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NLV00043IG2JM00@mailout4.samsung.com>; Fri, 27 Mar 2015 22:50:26 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-72-55156022f6b0 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 6A.BA.20081.22065155; Fri, 27 Mar 2015 22:50:26 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0NLV000ODIF0Y850@mmp1.samsung.com>; Fri, 27 Mar 2015 22:50:26 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org Cc: devicetree@vger.kernel.org, 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 v2 07/11] DT: Add documentation for the Skyworks AAT1290 Date: Fri, 27 Mar 2015 14:49:41 +0100 Message-id: <1427464185-27950-8-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1427464185-27950-1-git-send-email-j.anaszewski@samsung.com> References: <1427464185-27950-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrKLMWRmVeSWpSXmKPExsVy+t9jAV2lBNFQgz9/DCyO7pzIZDH/yDlW i96rzxktzja9YbfY+mYdo0XPhq2sFndPHWWz2L3rKavF4TftrBZn9q9kc+Dy2DnrLrvH4a8L WTz2zP/B6tG3ZRWjx4rV39k9Pm+SC2CL4rJJSc3JLEst0rdL4MpYfu4ZS8EsqYpJr6MaGI+I djFyckgImEh0HprHBmGLSVy4tx7I5uIQEljEKNH7+jMrSEJI4CejxKO7YEVsAoYSP1+8ZgKx RQSsJWYdms4CYjMLnGGUmDbVFsQWFvCQONK5EKyGRUBV4k7zCbBeXqD48qNzgGwOoGUKEnMm 2YCEOQU8JfZeWsUCscpDYsamG2wTGHkXMDKsYhRNLUguKE5KzzXUK07MLS7NS9dLzs/dxAgO vGdSOxhXNlgcYhTgYFTi4f2xWyRUiDWxrLgy9xCjBAezkgivSpBoqBBvSmJlVWpRfnxRaU5q 8SFGaQ4WJXFeJfu2ECGB9MSS1OzU1ILUIpgsEwenVAOjc8PsKbvXOso/CPPyjFBhY9zIsLvG ILLW/EvjvR8i16+kpZhnahRKNNWtlDORW76+MVHwu8Q9roebrRrfNT3WlZ6w+csT/WVG6iVm Z1bNOGIvPGPXr7l8iQbd4WKfF3a2CIi5BMXl6hzgNhE7yrM/mutod9ece7wG/LP2e7P5Bjbm HfNnalViKc5INNRiLipOBABalxF7OAIAAA== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 70 ++++++++++++++++++++ 1 file changed, 70 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..c3df4e9 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,70 @@ +* 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"; + 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>; + }; +};