From patchwork Sun Jan 15 10:12:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 643012 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76E9FC3DA78 for ; Sun, 15 Jan 2023 10:18:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230333AbjAOKSd (ORCPT ); Sun, 15 Jan 2023 05:18:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230137AbjAOKSa (ORCPT ); Sun, 15 Jan 2023 05:18:30 -0500 Received: from mail-wm1-x32d.google.com (mail-wm1-x32d.google.com [IPv6:2a00:1450:4864:20::32d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5777DCDE1; Sun, 15 Jan 2023 02:18:29 -0800 (PST) Received: by mail-wm1-x32d.google.com with SMTP id l41-20020a05600c1d2900b003daf986faaeso272628wms.3; Sun, 15 Jan 2023 02:18:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=zNZMQn185TG+Tx8tewhmSx+Qg1QuTVS0EFy/ikAT8rs=; b=HSn5ULbp18jNbEDsW2780oWNWY+ZUmSoShdVMmeX7zuQ41YBfpTXEqV6YaHd9OcUBi 0AC6r68uaeOefJil7Q30wCVATb1c0zyiL87uXKvj4v+gVek/t9zZ+Wc/xEry9VsmIrNt YAJyqdNQnHHTs62U5/agkQMLWpfLlCZ5Axm1cnSJoXYvH46ad4Xtg5FGLJGiUe5qrXto sCgbDRWtEoqadsVotQqhRrS1RwCHw563kJr8C22Eqaj34z+2LYNzblfoHvaiWSjYYG6d fRwtZdNXmjNFhTBeFDoBRoZiRUVTOJtzyNuCPtRGKeipL1q65gJ7CQigJVMMpVGdVXzJ jDjA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=zNZMQn185TG+Tx8tewhmSx+Qg1QuTVS0EFy/ikAT8rs=; b=qlRm+J/azpFOt8ypXODXECRUyxMj8/FNSvoeGBq/+dVaynDPLrFWf6XReAHMnLJMuE zkiYdKt4+qzzEYDXJfmvH/CvURXjEYnk0zhwX3W6djaC7yXf2fYLyYwbwHtv2XpgUMRT VntlsvL45reoxi8y6dMgIf5TSRBJ6uUuhrRl9cvoS2Keb0aCTgm9XmY8hh2DkfMmsL1u GSjmDsArCEjl2xG+ywdoYly67NrNEjgtvOvOZNKmskVrC6ZJFFUmVbp2ZA+9qet0piDs jikrCHeHk1DG62zTq742IY3lBIMmm6wAtIRJiPFGweoQ0G4Kl17YhoHWwm8KVvgGUyaG 1mJQ== X-Gm-Message-State: AFqh2kp064AAv6T4V5S241/d41SSimOaaFXzKGiFidhbTgn0XivDofAz bpH40sg749FY58rddouffdUYBhp1qqE= X-Google-Smtp-Source: AMrXdXuSX+U2cpCqO/uF7u+5F7m0/2cXk7pk8tLHcjNPlFW800Yny+G9d9TqkKnNQapyyuoZ/X89Qw== X-Received: by 2002:a05:600c:4f96:b0:3d9:ed3b:5b3e with SMTP id n22-20020a05600c4f9600b003d9ed3b5b3emr20979706wmq.19.1673777907222; Sun, 15 Jan 2023 02:18:27 -0800 (PST) Received: from ?IPV6:2a01:c22:6e61:8c00:154f:326e:8d45:8ce7? (dynamic-2a01-0c22-6e61-8c00-154f-326e-8d45-8ce7.c22.pool.telefonica.de. [2a01:c22:6e61:8c00:154f:326e:8d45:8ce7]) by smtp.googlemail.com with ESMTPSA id h10-20020a1ccc0a000000b003d237d60318sm30545648wmb.2.2023.01.15.02.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 15 Jan 2023 02:18:26 -0800 (PST) Message-ID: <60e3b33b-360e-94f0-5065-08589cb1cab6@gmail.com> Date: Sun, 15 Jan 2023 11:12:30 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: [PATCH v3 1/3] dt-bindings: i2c-gpio: Add property i2c-gpio,sda-output-only Content-Language: en-US From: Heiner Kallweit To: Rob Herring , Krzysztof Kozlowski , Wolfram Sang Cc: "linux-i2c@vger.kernel.org" , "devicetree@vger.kernel.org" References: <3a5545f3-f858-2c80-8bd4-2e0d401a1dc0@gmail.com> In-Reply-To: <3a5545f3-f858-2c80-8bd4-2e0d401a1dc0@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org There are slave devices that understand I2C but have read-only SDA and SCL. Examples are FD650 7-segment LED controller and its derivatives. Typical board designs don't even have a pull-up for both pins. Therefore don't enforce open-drain if SDA and SCL both are unidirectional. This patch makes i2c-gpio usable with such devices, based on new DT property i2c-gpio,sda-output-only. Reviewed-by: Rob Herring Signed-off-by: Heiner Kallweit --- Documentation/devicetree/bindings/i2c/i2c-gpio.yaml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml b/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml index e0d76d5eb..fd84a60d9 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml +++ b/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml @@ -33,6 +33,10 @@ properties: open drain. maxItems: 1 + i2c-gpio,sda-output-only: + description: sda as output only + type: boolean + i2c-gpio,scl-output-only: description: scl as output only type: boolean