From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90B4CC48BD5 for ; Tue, 25 Jun 2019 10:24:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 63CC8214DA for ; Tue, 25 Jun 2019 10:24:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="o14q/pvD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 63CC8214DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=w+3Sfo+rgs/fbZvLklOMzoJcpsKxq4uV5zI94tScih0=; b=o14q/pvD8fKzoU4MCvouZsZkhZ UgIpaJ3G/0JsCtgfx2wbSptmNL+zkf0U6j55PcaWbhwWphbU/7e1tNsLKgByMI9zTuWS2f9qbZD14 jelfdYM8mlcUyzmJQ+2sCIez5OUAhGkot/tG75OAnx8Wq4rJ2WMQz+v5yq+VMurQIKfRI6OsHVueR OLozN457irYJg1G8q9ZWpU6p8ITsQPoZU2+lR80vdATMT4wyOG1t9cFcS5utmw7l1F0eBzmSePQYw 7vO4lkRKstpCXQe5/qsB+rsUogUBPPbgoUNyk9QZvnvz14jAbxcxoMuMoeLAzsPuw+J8bfjChqSVA nRjQa/yg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfidA-0002eD-Cn; Tue, 25 Jun 2019 10:24:52 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hfid7-0002d7-Bg for linux-arm-kernel@lists.infradead.org; Tue, 25 Jun 2019 10:24:50 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: andrzej.p) with ESMTPSA id 7C869288DC0 From: Andrzej Pietrasiewicz To: dri-devel@lists.freedesktop.org Subject: [PATCH v2 0/2] Associate ddc adapters with connectors Date: Tue, 25 Jun 2019 12:24:39 +0200 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190625101655.n246vbwtupb4eoyz@shell.armlinux.org.uk> References: <20190625101655.n246vbwtupb4eoyz@shell.armlinux.org.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190625_032449_529282_1B8771F1 X-CRM114-Status: GOOD ( 10.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, Joonyoung Shim , Maxime Ripard , Seung-Woo Kim , Maarten Lankhorst , linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Inki Dae , David Airlie , Kyungmin Park , Kukjin Kim , Daniel Vetter , kernel@collabora.com, Sean Paul , linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org It is difficult for a user to know which of the i2c adapters is for which drm connector. This series addresses this problem. The idea is to have a symbolic link in connector's sysfs directory, e.g.: ls -l /sys/class/drm/card0-HDMI-A-1/ddc lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \ -> ../../../../soc/13880000.i2c/i2c-2 The user then knows that their card0-HDMI-A-1 uses i2c-2 and can e.g. run ddcutil: ddcutil -b 2 getvcp 0x10 VCP code 0x10 (Brightness ): current value = 90, max value = 100 The first patch in the series adds struct i2c_adapter pointer to struct drm_connector. If the field is used by a particular driver, then an appropriate symbolic link is created by the generic code, which is also added by this patch. The second patch is an example of how to convert a driver to this new scheme. v1..v2: - used fixed name "ddc" for the symbolic link in order to make it easy for userspace to find the i2c adapter Andrzej Pietrasiewicz (2): drm: Include ddc adapter pointer in struct drm_connector drm/exynos: Provide ddc symlink in connector's sysfs drivers/gpu/drm/drm_sysfs.c | 7 +++++++ drivers/gpu/drm/exynos/exynos_hdmi.c | 11 +++++------ include/drm/drm_connector.h | 11 +++++++++++ 3 files changed, 23 insertions(+), 6 deletions(-) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel