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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 661CDC48BD5 for ; Tue, 25 Jun 2019 10:24:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C6C7215EA for ; Tue, 25 Jun 2019 10:24:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731570AbfFYKYt (ORCPT ); Tue, 25 Jun 2019 06:24:49 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:56360 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726301AbfFYKYt (ORCPT ); Tue, 25 Jun 2019 06:24:49 -0400 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 Cc: kernel@collabora.com, m.szyprowski@samsung.com, Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Inki Dae , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Kukjin Kim , Krzysztof Kozlowski , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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