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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 8A806C433DB for ; Sat, 13 Mar 2021 08:43:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C84864F18 for ; Sat, 13 Mar 2021 08:43:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230441AbhCMInN (ORCPT ); Sat, 13 Mar 2021 03:43:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233545AbhCMImn (ORCPT ); Sat, 13 Mar 2021 03:42:43 -0500 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 252F3C061574 for ; Sat, 13 Mar 2021 00:42:43 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id q5so4731657pgk.5 for ; Sat, 13 Mar 2021 00:42:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=beagleboard-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=pVXzAavbWQCIuyim7qVlCD+k9KLwZXY4SN3cSaFtD94=; b=sfbmW7mEOQ/RXDel1aRVFFwUIRa7HH9D1Wbsazud96yTVFornNkX3AWSXhpMW5KqPk uG/HMVGvbQlAKET251HGuLZeWYK7XGbrOgTrpeBhiiUo9qJ6p+Z24NMQAKwLlXaRlyc5 cmceVTE6Xila1p6ZIDv+9DDmLZk5sV2gRPVqyfew6CjpfnCsMMdFLHIxMVwdFL2xlRTo HuAy4FlSocHDH24ieAJoQqLkvdNO42anbX7hD06lII9aK3MCAa5Co3nOp87LYXiV9eOh JyeX22DIgw8nMbkR4NPJDJrjzKMHYWwg3tD9KNWc9W+GBg5HBVPISgCgKoGL7fwFsu57 Othw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=pVXzAavbWQCIuyim7qVlCD+k9KLwZXY4SN3cSaFtD94=; b=E17bTkuc65NxbjHwD6thHnaaN3S4X0ZcEwDji1O/bpVCBx91hzhpUMChjGL4j1/aam lLwjv5c4nQVWj9h8/jbHcM8doY3ITO65Vd/HLYCEFLyVyruO3HEKNPM7APvdu3E9dtdP bckSvQr2FE83a+zeSbxaTyv8+J4cMdNYxetNqdcbzXxCvLhkbine/yAt0mRrSjdlz1ru DSWqBOhKOCt0EuSbPE92I5CYMelFFi1QAeQS7ac5TlzE0LBXSN8++DWAJmRfzZJKjIar eKl/VU0Bi79OW19vCOSqQicAdZQErDArFfeFs6LivwVa8jZ2tKe4/9Fig1kOkCMTmK2t +mjw== X-Gm-Message-State: AOAM5315nzaIR5E2B1ON7S1LL8ChGdQ2l/LepNR5KC5W6AtpCMc2juh6 KO6AbZ0MNCdqjhibQlKev27nZzo+Q5WuZ922 X-Google-Smtp-Source: ABdhPJwClrJYe1/6OfrldTxrl8D09eR8P+9mHwokjr9mcjKpjcs5o0H1wsuB3bOHVBEWDVdulWqcNA== X-Received: by 2002:a63:6982:: with SMTP id e124mr15526357pgc.46.1615624962566; Sat, 13 Mar 2021 00:42:42 -0800 (PST) Received: from x1 ([2601:1c0:4701:ae70:70ad:d592:e701:79d3]) by smtp.gmail.com with ESMTPSA id q5sm7412514pfk.219.2021.03.13.00.42.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 13 Mar 2021 00:42:41 -0800 (PST) Date: Sat, 13 Mar 2021 00:42:39 -0800 From: Drew Fustini To: "Enrico Weigelt, metux IT consult" Cc: Linus Walleij , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Tony Lindgren , Andy Shevchenko , Alexandre Belloni , Geert Uytterhoeven , Pantelis Antoniou , Jason Kridner , Robert Nelson , Joe Perches , Dan Carpenter , Jonathan Corbet , linux-doc@vger.kernel.org, Geert Uytterhoeven Subject: Re: [PATCH v9 2/4] pinctrl: pinmux: Add pinmux-select debugfs file Message-ID: <20210313084239.GB1172642@x1> References: <20210302053059.1049035-1-drew@beagleboard.org> <20210302053059.1049035-3-drew@beagleboard.org> <349b09f8-fe99-d0d4-dd11-c288bf66cb4d@metux.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <349b09f8-fe99-d0d4-dd11-c288bf66cb4d@metux.net> Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On Fri, Mar 12, 2021 at 02:57:54PM +0100, Enrico Weigelt, metux IT consult wrote: > On 02.03.21 06:30, Drew Fustini wrote: > > Hi folks, > > > Add "pinmux-select" to debugfs which will activate a pin function for a > > given pin group: > > > > echo "" > pinmux-select > > > > The write operation pinmux_select() handles this by checking that the > > names map to valid selectors and then calling ops->set_mux(). > > I've already been playing with similar idea, but for external muxes. > For example, some boards have multiple SIM slots that can be switched > via some gpio pin. > > Not sure whether traditional pinmux would be a good match for that. > > > --mtx > Thank you for your comment. I am interested in understanding other use cases. Linus can hopefully correct me, but I think this is covered by section "Drivers needing both pin control and GPIOs" in pinctl.rst [1]. The driver could be both a GPIO consumer and pinctrl consumer and then be able to call pinctrl_select_state() and devm_gpio_request(). Thank you, Drew [1] https://www.kernel.org/doc/html/latest/driver-api/pinctl.html