From patchwork Wed Jun 29 09:17:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 641935 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3rfcYc0r1dz9t0p for ; Wed, 29 Jun 2016 19:19:00 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752232AbcF2JS4 (ORCPT ); Wed, 29 Jun 2016 05:18:56 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:7346 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752332AbcF2JSV (ORCPT ); Wed, 29 Jun 2016 05:18:21 -0400 Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com id ; Wed, 29 Jun 2016 02:18:11 -0700 Received: from HQMAIL101.nvidia.com ([172.20.187.10]) by hqnvupgp08.nvidia.com (PGP Universal service); Wed, 29 Jun 2016 02:17:06 -0700 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Wed, 29 Jun 2016 02:17:06 -0700 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Wed, 29 Jun 2016 09:18:20 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server id 15.0.1130.7 via Frontend Transport; Wed, 29 Jun 2016 09:18:20 +0000 Received: from jonathanh-lm.nvidia.com (Not Verified[10.21.132.149]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 5, 8150) id ; Wed, 29 Jun 2016 02:18:19 -0700 From: Jon Hunter To: Thierry Reding , David Airlie , Stephen Warren , Alexandre Courbot , Wolfram Sang , Rob Herring , Mark Rutland CC: Linus Walleij , , , , , , Jon Hunter Subject: [PATCH V2 06/11] dt-bindings: i2c: Add support for 'i2c-bus' subnode Date: Wed, 29 Jun 2016 10:17:52 +0100 Message-ID: <1467191877-26017-7-git-send-email-jonathanh@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1467191877-26017-1-git-send-email-jonathanh@nvidia.com> References: <1467191877-26017-1-git-send-email-jonathanh@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org The I2C driver core for boards using device-tree assumes any subnode of an I2C adapter in the device-tree blob is an 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. In order to share these pins using the pinctrl framework, it is necessary to add subnodes to the I2C device node that represent these pins. To allow I2C adapters to have non-I2C specific subnodes in device-tree that are not parsed by the I2C driver core, add support for an optional '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 Acked-by: Rob Herring Acked-by: Wolfram Sang --- 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..5fa691e6f638 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, the 'i2c-bus' subnode can be used for + populating I2C devices. If the 'i2c-bus' subnode is present, only + subnodes of this will be considered as I2C slaves. The properties, + '#address-cells' and '#size-cells' must be defined under this subnode + if present. + - i2c-scl-falling-time-ns Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C specification.