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a=rsa-sha256; c=relaxed/relaxed; d=axentia.se; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BEes1lQ8OmPFZjn9yL0bt/fI5c7bFfZ5l5BzsBz+1Nk=; b=gvIQRk5bv85kO8uFkVU766T2VlxS+LuNQpqlxKlCAyFRj4Uc0hKEUlwSTrJVmD0OJH8fTx90gA/Tzosete/U3dbW4clutK5Yb+TU4qVC8CyZ5A5gnqDXZ1r8w9UPudM1rFBXO4pMPvcwF/GE+jsJg5huzVAx7PXmtbrJYFB0cX8= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=peda@axentia.se; Received: from [192.168.13.3] (85.226.244.23) by HE1PR0201MB2459.eurprd02.prod.outlook.com (2603:10a6:3:82::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.973.16; Fri, 20 Jul 2018 10:39:40 +0000 Subject: Re: [PATCH v6 00/10] Add the I3C subsystem To: Boris Brezillon Cc: Arnd Bergmann , Wolfram Sang , linux-i2c@vger.kernel.org, Jonathan Corbet , "open list:DOCUMENTATION" , Greg Kroah-Hartman , Przemyslaw Sroka , Arkadiusz Golec , Alan Douglas , Bartosz Folta , Damian Kos , Alicja Jurasik-Urbaniak , Cyprian Wronka , Suresh Punnoose , Rafal Ciepiela , Thomas Petazzoni , Nishanth Menon , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , DTML , Linux Kernel Mailing List , Vitor Soares , Geert Uytterhoeven , Linus Walleij , Xiang Lin , linux-gpio@vger.kernel.org, Sekhar Nori , Przemyslaw Gaj References: <20180719152930.3715-1-boris.brezillon@bootlin.com> <2ab0ab75-2df0-2714-f007-c33b25481016@axentia.se> <20180720120518.445b947b@bbrezillon> From: Peter Rosin Organization: Axentia Technologies AB Message-ID: <1a2b7588-9c2e-a25c-6bae-5c8c8675667e@axentia.se> Date: Fri, 20 Jul 2018 12:39:37 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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The way an I3C master is supposed to switch from > open-drain to push-pull during a transaction or the concept of IBIs > are the first things that come to mind, but I guess you have plenty of > other reasons preventing you from implementing a i3c-bit-bang master. Why can't a bit-banger switch from open-drain to push-pull? That's just a matter of disconnecting some pull-ups, no? And maybe you know that no device on your bus uses IBIs? Maybe none of reasons for why bit-banging isn't feasible are applicable? I.e. maybe there can be a I3C bit-banger that perhaps isn't generic and isn't full-featured, but does work just fine in some specific setup? Cheers, Peter