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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 E33B5C4743C for ; Mon, 21 Jun 2021 18:32:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C99F8611BD for ; Mon, 21 Jun 2021 18:32:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231176AbhFUSeN (ORCPT ); Mon, 21 Jun 2021 14:34:13 -0400 Received: from mout.kundenserver.de ([212.227.126.134]:45633 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232144AbhFUSeL (ORCPT ); Mon, 21 Jun 2021 14:34:11 -0400 Received: from [192.168.1.155] ([95.118.106.223]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.167]) with ESMTPSA (Nemesis) id 1Mum6l-1l5DWs4Ayp-00rlVR; Mon, 21 Jun 2021 20:31:46 +0200 Subject: Re: [PATCH v5 2/2] gpio: gpio-cascade: add generic GPIO cascade To: Andy Shevchenko , Mauri Sandberg Cc: Mauri Sandberg , Bartosz Golaszewski , Geert Uytterhoeven , Linus Walleij , "open list:GPIO SUBSYSTEM" , Rob Herring , devicetree , Linux Kernel Mailing List , Drew Fustini References: <20210325122832.119147-1-sandberg@mailfence.com> <20210621172053.107045-1-maukka@ext.kapsi.fi> <20210621172053.107045-3-maukka@ext.kapsi.fi> From: "Enrico Weigelt, metux IT consult" Message-ID: <8d28463e-7a67-229a-6934-e3a59a8ab330@metux.net> Date: Mon, 21 Jun 2021 20:31:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: tl Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:Hhh5/Dq8916GL3BChU1V2Gm++0xp8Eo4qOFj6Wdbl/qy6ca3y5L qQLzqRtOLSMTzrNJFUd5sWHeCzRqLmrXnmfr4s+BvMNjtJcLZ3gDzxxqTBfrMWbL2yOvlrq dJ8hRCzdxOUeF7+ln3MfdUnETyWz7i7y/rY/mu/px6oYA9sWEV51xu6432pbSKgrG3yGazQ npjycJdxAcAgpHTS/0t9A== X-UI-Out-Filterresults: notjunk:1;V03:K0:7nCPMQ8NwI0=:yMIWa4LDmTY1Bd4Hbnefai rdfJ/Hi7aRSVziZZ6lbqaoi3/JD+YwPFT58QctvFDZa66TnISBoHUcnkD3Fvy0shwKQ+AlmMG XYvIZXQ10qZAz9+M01hEaClcTJWcIaOI35/ftJhJKI0dpHjMospVK78uLtkbgq/n/hDSGZlje tlAVVbgjMimwDEYcePXVwHU1rlu1GstaAnDOb8D332Dzf18fmw6+ODejPMw7Gn69Pt9mWsXE+ u7SiSHCKg1qcqOlPpHr+urkONSrFk1HPxCEafXJTJETSq8PHI/YIIATpl8i/kqa0scJZT6ljm PhrJ+IDSFYwLciIP2TWLyv5xmV+GmuTNgxIPfk+m5pkAwopgHByKptxrY/7kF6Q4vzOjarQSW BYOR/Reo878icO9+ebRrf+maGbPo7+3MyQ5zZkaCSU7g+28+92zNP8FMSu05V2rQXoKs+cRHZ Ab41eZ0ddGhCXJ4b8Ea9IWNCUARfDGH2d1Wcc0YEe9nBHxmNdwBbpPRzkAKELRP6LyxDr0p5f 1AUSOQw5EjbIWiBDHrv2Jo= Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On 21.06.21 19:43, Andy Shevchenko wrote: > Since in parallel there is a discussion about the virtio-gpio > interface, how will this work with it? Haven't really understood what this is actually doing. A multiplexer where only external line is connected to some actual gpio at a time ? Or does it merge multiple inputs into one (eg. logical OR) ? Is that about real hardware mux chips or just a software only ? What is the actual use case ? For now, I don't see any relation to virtio-gpio. Correct me if I'm wrong. --mtx -- --- Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren GPG/PGP-Schlüssel zu. --- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@metux.net -- +49-151-27565287