From patchwork Tue Feb 16 22:44:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 383471 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 BB825C433DB for ; Tue, 16 Feb 2021 22:47:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90AAA64DFF for ; Tue, 16 Feb 2021 22:47:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231265AbhBPWrH (ORCPT ); Tue, 16 Feb 2021 17:47:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231217AbhBPWrG (ORCPT ); Tue, 16 Feb 2021 17:47:06 -0500 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFFE3C061797 for ; Tue, 16 Feb 2021 14:45:45 -0800 (PST) Received: by mail-pf1-x435.google.com with SMTP id c11so7100586pfp.10 for ; Tue, 16 Feb 2021 14:45:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=beagleboard-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yUCiqkksgcwS9O+xvzvVuH6FNIKF3LonMA8pWP2Dk/o=; b=orlgr292I9vem0IDvmJOpJs6SBNLVNfrpFzhwaN1Gkot/mbrA68mrOr76RlJD6X9rw 5CqZPChR0zwTTBx/vpMPbn4/f6lq8bxpyY2UMMH7WPJr2j8UxfVyY0ww6B2ahz4fSbHR wMz7FmgNKHq0VaFF0jJCcXLf8YOZYKg21gtort5jToK5tZTQ6tOGFIslhtckpbuToegs vCsThY19AXW//27XCpknMpLkkaHo15WtKFRtJ2MUcbtHLrs1ETOoKqfMYBoZqRo0FrXs IJc9z/Tp2oc6F9xAJXFnly2OZMjtrtXdKtzzZcPXRrxRlJtxVUvOuLEUUOppeoosWepj THNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yUCiqkksgcwS9O+xvzvVuH6FNIKF3LonMA8pWP2Dk/o=; b=thC/nh/KAMsLZTZfariZpvBGmH0xDU7mqdf2HCtlq7TRYuMWk6fiDypwzvyHIKTMJn dzmN4FfecYPpIDIP/F+7CWLw2OeoTWDCgaK8bkBedgrpa0+83njutqDNhyuA0/HvWVN0 F0/6oZc/uXoRsZxHcMoMg2r2ivCGM0Brd8hHuK1Vpd5TiuoqG4v9KpoWNoABZ7trUM2J SXmiIgRPmFxc9zfJkkqm3ukLRnk5rsB6t2wolW24X2vqs3v5bAyqXIjuBRN/Q95kgolG burihHEHhBS5rXSfZnHw/M+9IcDgsIihFpfdSMb8tTiSLbwpzfgf0frnCr5wp1p2/RxJ boLg== X-Gm-Message-State: AOAM532igXnJR8MbRO1UXDlOhkgd2F2qhz2LmgMkNTySzplWpq/6Q9WK sgPpU6CzFHaQsJw5LTWTrb5DJA== X-Google-Smtp-Source: ABdhPJxkZYpUoubKxTZgPxZ4EIED2k5HlzFMqFCMgsFtAnQQwQYeNdRkChmrAm3rE3oif4IqhdFC4A== X-Received: by 2002:a63:f74f:: with SMTP id f15mr21089308pgk.413.1613515545548; Tue, 16 Feb 2021 14:45:45 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:4e06:8d2c:6f9:5b31]) by smtp.gmail.com with ESMTPSA id 184sm1922465pfc.176.2021.02.16.14.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Feb 2021 14:45:45 -0800 (PST) From: Drew Fustini To: 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 Cc: Drew Fustini Subject: [PATCH v6 3/3] docs/pinctrl: document debugfs files Date: Tue, 16 Feb 2021 14:44:55 -0800 Message-Id: <20210216224455.1504008-4-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210216224455.1504008-1-drew@beagleboard.org> References: <20210216224455.1504008-1-drew@beagleboard.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Document debugfs directories and files created for pinctrl subsystem. Suggested-by: Andy Shevchenko Signed-off-by: Drew Fustini Reviewed-by: Andy Shevchenko --- Documentation/driver-api/pinctl.rst | 37 +++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/Documentation/driver-api/pinctl.rst b/Documentation/driver-api/pinctl.rst index 3d2deaf48841..37bc3bd64cd8 100644 --- a/Documentation/driver-api/pinctl.rst +++ b/Documentation/driver-api/pinctl.rst @@ -1428,3 +1428,40 @@ on the pins defined by group B:: The above has to be done from process context. The reservation of the pins will be done when the state is activated, so in effect one specific pin can be used by different functions at different times on a running system. + + +Debugfs files +============= +These files are created in ``/sys/kernel/debug/pinctrl``: + +- ``pinctrl-devices``: prints each pin controller device along with columns to + indicate support for pinmux and pinconf + +- ``pinctrl-handles``: iterate through the list of pin controller handles and + print the corresponding pinmux maps + +- ``pinctrl-maps``: print all pinctrl maps + +A sub-directory is created inside of ``/sys/kernel/debug/pinctrl`` for each pin +controller device containing these files: + +- ``pins``: prints a line for each pin registered on the pin controller. The + pinctrl driver may add additional information such as register contents. + +- ``gpio-ranges``: print ranges that map gpio lines to pins on the controller + +- ``pingroups``: print all pin groups registered on the pin controller + +- ``pinconf-pins``: print pin config settings for each pin + +- ``pinconf-groups``: print pin config settings per pin group + +- ``pinmux-functions``: print each pin function along with the pin groups that + map to the pin function + +- ``pinmux-pins``: iterate through all pins and print mux owner, gpio owner + and if the pin is a hog + +- ``pinmux-select``: write to this file to activate a pin function and group:: + + echo "" > pinmux-select