From patchwork Fri Jun 17 12:03:41 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 9183703 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DCDDF60573 for ; Fri, 17 Jun 2016 12:05:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CB4762835E for ; Fri, 17 Jun 2016 12:05:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C03B72839C; Fri, 17 Jun 2016 12:05:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C564728399 for ; Fri, 17 Jun 2016 12:05:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CBF796EBE2; Fri, 17 Jun 2016 12:05:26 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from hqemgate15.nvidia.com (hqemgate15.nvidia.com [216.228.121.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3177B6EBE1 for ; Fri, 17 Jun 2016 12:04:34 +0000 (UTC) Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com id ; Fri, 17 Jun 2016 05:04:14 -0700 Received: from HQMAIL104.nvidia.com ([172.18.146.11]) by hqnvupgp08.nvidia.com (PGP Universal service); Fri, 17 Jun 2016 05:01:45 -0700 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Fri, 17 Jun 2016 05:01:45 -0700 Received: from HQMAIL108.nvidia.com (172.18.146.13) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Fri, 17 Jun 2016 12:04:32 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server id 15.0.1130.7 via Frontend Transport; Fri, 17 Jun 2016 12:04:32 +0000 Received: from jonathanh-lm.nvidia.com (Not Verified[10.21.132.108]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 5, 8150) id ; Fri, 17 Jun 2016 05:04:32 -0700 From: Jon Hunter To: Thierry Reding , David Airlie , Stephen Warren , Alexandre Courbot , Wolfram Sang , Linus Walleij , Rob Herring , Mark Rutland Subject: [RFC PATCH 07/13] dt-bindings: i2c: Add support for 'i2c-bus' subnode Date: Fri, 17 Jun 2016 13:03:41 +0100 Message-ID: <1466165027-17917-8-git-send-email-jonathanh@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1466165027-17917-1-git-send-email-jonathanh@nvidia.com> References: <1466165027-17917-1-git-send-email-jonathanh@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, Jon Hunter , linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The I2C driver core for boards using device-tree assumes any subnode of an I2C adapter in the device-tree blob as being a I2C slave device. Although this makes complete sense, some I2C adapters may have subnodes which are not I2C slaves but subnodes presenting other features. For example some Tegra devices have an I2C interface which may share its pins with other devices and to share these pins subnodes for representing these pins so they have be shared via the pinctrl framework are needed. To allow I2C adapters to have non-I2C specific subnodes in device-tree that are not parsed by the I2C driver core by adding support for a 'i2c-bus' subnode where I2C slaves can be placed. If the 'i2c-bus' subnode is present then all I2C slaves must be placed under this subnode. Signed-off-by: Jon Hunter Acked-by: Thierry Reding --- Documentation/devicetree/bindings/i2c/i2c.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt index f31b2ad1552b..ed56b08c7e6e 100644 --- a/Documentation/devicetree/bindings/i2c/i2c.txt +++ b/Documentation/devicetree/bindings/i2c/i2c.txt @@ -32,6 +32,14 @@ wants to support one of the below features, it should adapt the bindings below. - clock-frequency frequency of bus clock in Hz. +- i2c-bus + For I2C adapters that have child nodes that are a mixture of both I2C + devices and non-I2C devices (such as a pin controller), the 'i2c-bus' + subnode can be used for populating I2C devices to prevent the I2C core + from attempting to add any non-i2c nodes as I2C devices. If 'i2c-bus' + subnode is present then all I2C slaves must be added under this + subnode. + - i2c-scl-falling-time-ns Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C specification.