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=-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 D2CB2C433E0 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 A49F664E68 for ; Tue, 16 Feb 2021 22:47:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231273AbhBPWrJ (ORCPT ); Tue, 16 Feb 2021 17:47:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231239AbhBPWrD (ORCPT ); Tue, 16 Feb 2021 17:47:03 -0500 Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE8E4C061793 for ; Tue, 16 Feb 2021 14:45:45 -0800 (PST) Received: by mail-pf1-x430.google.com with SMTP id z6so7136431pfq.0 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=f6Zz4+rCcQUJBxo5IJcNxbPR1abguqZdwr3/gdgewYRiNYOFKbpJtvjCV5kfnrtuFs XZRc/6VMgF+xNrl+Q3cMJ8XoeZ26uL/GApXfyMzEjvsa/rSQ67x8rsJG4jF9tYHmAAuG NNC2Gbb+DEhvjKpLgvrGMUz3nmo5BxHLEYWwkXM05d4yOHGh7fcVS8TQEztYdZsW4itu uW58dzm46whSWVn67fi9om4sUmHDgBgcVgzaYmdDrJRV7YRttuGxNbHeLlQ5XtbJqXI0 y9UEGrASA7Xq8O373P3JoEX4NTsqDQGaLX05uDQTz6gqt6jNePA93QfMcnNG/Vrzsyvs TsGw== X-Gm-Message-State: AOAM533vfCxrVxOJ7CHUhKnIJ53aO1B3Zsqqagj5WH5kV22u+ETootTD vpvfsaM4eRpPN32Te5oHpKZFDg== 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document debugfs directories and files created for pinctrl subsystem. Suggested-by: Andy Shevchenko Signed-off-by: Drew Fustini --- 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 -- 2.25.1