From patchwork Wed Feb 18 16:20:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5845201 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 70B02BF440 for ; Wed, 18 Feb 2015 16:25:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 92E5820221 for ; Wed, 18 Feb 2015 16:25:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A620820251 for ; Wed, 18 Feb 2015 16:25:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752631AbbBRQZj (ORCPT ); Wed, 18 Feb 2015 11:25:39 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:58858 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751795AbbBRQZg (ORCPT ); Wed, 18 Feb 2015 11:25:36 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NJZ004HT6YMW450@mailout3.samsung.com>; Thu, 19 Feb 2015 01:25:35 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-63-54e4bcfea29d Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id EF.99.20081.EFCB4E45; Thu, 19 Feb 2015 01:25:34 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NJZ003WS6QJDJ20@mmp1.samsung.com>; Thu, 19 Feb 2015 01:25:34 +0900 (KST) From: Jacek Anaszewski 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 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> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> References: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCLMWRmVeSWpSXmKPExsVy+t9jAd1/e56EGEy9b2FxdOdEJov5R86x WvRefc5ocbbpDbvF1jfrGC16Nmxltbh76iibxe5dT1ktDr9pZ7U4s38lmwOXx85Zd9k9Dn9d yOKxZ/4PVo++LasYPVas/s7u8XmTXABbFJdNSmpOZllqkb5dAlfGjRlH2QpOC1fcWF/dwNgj 0MXIwSEhYCJxd5pvFyMnkCkmceHeerYuRi4OIYFFjBL9l1cyQzjtTBKzbmxkAqliEzCU+Pni NZgtIhAp8e7oJbAiZoENjBKXJzSygCSEBXwlZm1rZwTZwCKgKtHYUA8S5hXwkDjbeo0NYrGC xJxJNiAmJ1D4wnMPkAohAXeJ6TffsU5g5F3AyLCKUTS1ILmgOCk911CvODG3uDQvXS85P3cT IzjsnkntYFzZYHGIUYCDUYmHt+H34xAh1sSy4srcQ4wSHMxKIry5K5+ECPGmJFZWpRblxxeV 5qQWH2KU5mBREudVsm8LERJITyxJzU5NLUgtgskycXBKNTD2ntnzbNqJ+q44jhtxJnG/JO6u m6WztE9Cr0LoULTy3omK65l7uZY9fret3+lhh+ZRI8eeez/b30Q96XOrYLW2epZZm6ntpvqQ QfLbK4GPAgmsb69eNS/3ND8Xd+DKAsH+xTalt40Fp+Yeecb8KnyRY3Gv7O8k03Avl0gFYSfN 6kfrjNZnPVJiKc5INNRiLipOBABYgNjANwIAAA== 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 | 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>; + }; +};