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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 D3CF8C2BA19 for ; Wed, 15 Apr 2020 08:08:17 +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 A859A20784 for ; Wed, 15 Apr 2020 08:08:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="doagmHXL"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="UeOoK6zh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A859A20784 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-i3c-bounces+linux-i3c=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:Cc:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date :Message-ID:From:References:To:Subject:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=FLj2BtN1oKnGsvJbP8U4CRl0qx7WvE84bYkmpyHFLHg=; b=doagmHXLJGiT+O JogxEK9Ja2Mr741TuoUBx40Vp/J3sscJ15d0M7VXLMfFFTp3FSZVby8fEi8L3+YzHF+S0lXgqqFWX 6xB9ssUp+Ze5SlTUUEqdBcwdQJvi89oTD+D2+cVsW4cRn87wkhZJU4r+pN6lyrO2+GjpMI+tTlH6y g5Hc5Aq9uhquFNp/ckTsRMdx8kfw0MD7qYMjz/rZPi1ldZC+Z2hChQG7BLXX2q8Cl+Oelu9JV4xb1 2z8HthMewSb8Gw6iXJPEs6zR5+MdsY3LTAM3Zpm//3PQN74ocRVJVaeOW1r0zmbC2nFSH/bANqTIt YYWaBEzdyKJmIBn2A/9w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOd5g-0005Cz-Bw; Wed, 15 Apr 2020 08:08:12 +0000 Received: from perceval.ideasonboard.com ([2001:4b98:dc2:55:216:3eff:fef7:d647]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOd5d-0005BG-3I for linux-i3c@lists.infradead.org; Wed, 15 Apr 2020 08:08:10 +0000 Received: from [192.168.0.20] (cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 9D67E2D1; Wed, 15 Apr 2020 10:07:58 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1586938079; bh=d3cM3Q3qHFbLBztwm4kDpHyKueuNUZD1Tu5L0584nsY=; h=Subject:To:Cc:References:Reply-To:From:Date:In-Reply-To:From; b=UeOoK6zhCEGPmWLfhjDbfahqvS6Qzqp2JDYPHFhNseng8pD8GWoA8LBLcfgqV8B0d FgdG8w1Y9HRgqoqn2TiLL/xE0BFME9xvY4VZWRmo4zLoJ2Z+SGoMKKSGLBNy4sGABS bcUJCRW8hGIv5gCmFr39QrbNGoYsl5bInOrGZepM= Subject: Re: [RFC PATCH v2 2/6] i2c: allow DT nodes without 'compatible' To: Wolfram Sang , Luca Ceresoli References: <20200318150059.21714-1-wsa+renesas@sang-engineering.com> <20200318150059.21714-3-wsa+renesas@sang-engineering.com> <11ca7487-ac07-f714-8573-20d1a0040212@lucaceresoli.net> <20200415075911.GA1141@ninjato> From: Kieran Bingham Organization: Ideas on Board Message-ID: <8937e466-fe3f-3686-98a9-8013990bc3f9@ideasonboard.com> Date: Wed, 15 Apr 2020 09:07:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20200415075911.GA1141@ninjato> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200415_010809_290135_E8C5DFBA X-CRM114-Status: GOOD ( 10.67 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux I3C List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: kieran.bingham+renesas@ideasonboard.com Cc: Rob Herring , Jacopo Mondi , Geert Uytterhoeven , linux-kernel@vger.kernel.org, Vladimir Zapolskiy , linux-renesas-soc@vger.kernel.org, Wolfram Sang , linux-i2c@vger.kernel.org, =?UTF-8?Q?Niklas_S=c3=b6derlund?= , linux-i3c@lists.infradead.org, Laurent Pinchart Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org Hi Wolfram, On 15/04/2020 08:59, Wolfram Sang wrote: > >> As I said in the reply to v1, I think we should reserve addresses also >> when there is a compatible string but no matching driver, but this is >> another story and can be handled separately. > > Unless I misunderstand you, I think they do already. Note that > only 'i2cdetect' shows a device as busy *IFF* there is a driver bound to > it. The internal 'i2c_check_addr_busy' does not care about a driver > being bound. You can check this by trying to use > i2c_new_ancillary_device() with an address which is already described in > DT but which driver is disabled. Aha, is it easy enough to distinguish that difference in user-space so that we can present a specific character to indicate this in i2cdetect? Or is that not so easy? -- Kieran _______________________________________________ linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c