From patchwork Wed Mar 4 16:14:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5937841 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 D52DD9F36A for ; Wed, 4 Mar 2015 16:19:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E553A202B8 for ; Wed, 4 Mar 2015 16:19:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEE7A201CE for ; Wed, 4 Mar 2015 16:19:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933428AbbCDQQ4 (ORCPT ); Wed, 4 Mar 2015 11:16:56 -0500 Received: from mailout1.samsung.com ([203.254.224.24]:23695 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933412AbbCDQQy (ORCPT ); Wed, 4 Mar 2015 11:16:54 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NKP00E9K3W4XI20@mailout1.samsung.com>; Thu, 05 Mar 2015 01:16:52 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-58-54f72ff4d86c Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 8D.B4.20081.4FF27F45; Thu, 05 Mar 2015 01:16:52 +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 <0NKP0082A3SJHN70@mmp1.samsung.com>; Thu, 05 Mar 2015 01:16:52 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org Cc: linux-kernel@vger.kernel.org, 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/RFC v12 13/19] DT: Add documentation for the Skyworks AAT1290 Date: Wed, 04 Mar 2015 17:14:34 +0100 Message-id: <1425485680-8417-14-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> References: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrDLMWRmVeSWpSXmKPExsVy+t9jAd0v+t9DDFb/0rA4unMik8X8I+dY LXqvPme0ONv0ht3i8q45bBZb36xjtOjZsJXV4u6po2wWu3c9ZbU4/Kad1eLM/pVsDtweO2fd Zfc4/HUhi8ee+T9YPfq2rGL0WLH6O7vH501yAWxRXDYpqTmZZalF+nYJXBk7Wz4yF7wWr3j9 v4G1gfGocBcjB4eEgIlE39GMLkZOIFNM4sK99WxdjFwcQgKLGCVmTOxlhnDamSRaejpZQKrY BAwlfr54zQRiiwhYS8w6NJ0FpIhZ4A2jxKwN58ASwgK+Eh9vLWQGsVkEVCVOXLgAFucV8JDo WXmCGWKzgsScSTYgYU6g8Nmb68FKhATcJQ4/3M8ygZF3ASPDKkbR1ILkguKk9FxDveLE3OLS vHS95PzcTYzgMHwmtYNxZYPFIUYBDkYlHt6M6G8hQqyJZcWVuYcYJTiYlUR4n7N9DxHiTUms rEotyo8vKs1JLT7EKM3BoiTOq2TfFiIkkJ5YkpqdmlqQWgSTZeLglGpg9ONs99GSvR9wS4W5 5aaT7EsmxRXCm/JjJYPdOlubEtXc/supu0pLZGWrbAm6KJOa6fp0QWNff9kly9P7a1gDxSZU sC69/qGiQDxW/pbogxK7yK1ydjMDvJapf9T50ZKWp8ortVekVSzu6T6pr+sP6G4yuN6p79L7 4TqTw+pr0q3XZmy+zKzEUpyRaKjFXFScCAANwSDhPwIAAA== 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 | 64 ++++++++++++++++++++ 1 file changed, 64 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..4f3583d --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,64 @@ +* 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. + +Required properties: + +- compatible : Must be "skyworks,aat1290". +- gpios : Two gpio pins in order FLEN, EN/SET + +Optional properties: +- pinctrl-names : Must contain entries: "default", "host", "isp". Entries + "default" and "host" must refer to the same pin configration + node, which sets the strobe signal source to host. Entry "isp" + must refer to the pin configuration node, which sets the strobe + signal source to ISP. + +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 and exynos4412-trats2 board with a +switch that allows for routing the strobe source signal either from host or +from ISP): + +aat1290 { + compatible = "skyworks,aat1290"; + gpios = <&gpj1 1 0>, <&gpj1 2 0>; + 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>; + }; +};