From patchwork Tue Mar 2 05:30:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 390613 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=-16.7 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 BBC55C433DB for ; Tue, 2 Mar 2021 21:20:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79BE564F2E for ; Tue, 2 Mar 2021 21:20:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383717AbhCBVRM (ORCPT ); Tue, 2 Mar 2021 16:17:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1576925AbhCBFfK (ORCPT ); Tue, 2 Mar 2021 00:35:10 -0500 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 552FFC06121E for ; Mon, 1 Mar 2021 21:32:18 -0800 (PST) Received: by mail-pf1-x42d.google.com with SMTP id d12so10549835pfo.7 for ; Mon, 01 Mar 2021 21:32:18 -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=AND5hR7g+etm8p1XQXNCrrPsiiY+ufosQMI5JJrzRVE=; b=K8lCA4A1uHoty55BpP30fhzuelUH2422FzM5XyB/82aEOA5s8Jc2Pgs1pEWiBARHZJ BQl/rNrns8TZZ3ExaMbFs9OZ5/1pqLO8alJmor3Sd7nfjHmpzqeM5cDtJEXy2Qi/309W 421xXN/4fvHLnYge+BcT9EoTKWNzKqc0SELYrRo3cU1QPhtfC7iqOzW1yVwOswg6ZDb7 zcjwnnD3DCiTlt7xxta+/eTAf3f3cXHfkmaTghgaoc+RGIjSKC+e9HUjr7OPFsoFS190 Ndf3AJb3ndkz+HcMgWIPB/dgvK9FxiS6OjhAOC0miRXWLZlistc5JY+uC2Krwokxad01 AV5Q== 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=AND5hR7g+etm8p1XQXNCrrPsiiY+ufosQMI5JJrzRVE=; b=hjpLhjxDznCH4SbKbCrLlLXBC2y1kIaUDC/svim0XVjejHMFh81D+dUNL5IyssltFk xRXEyZQu8FXOk1wnUWFkt3ZDe6KE6aagW4UKcvlCTowf2k+tvuLF5H0YkakS1c9z6g8s Yd+z6JETZpeTlelM56KtqLnoLzI+X1cSAk32tgBLfnlnWhJsGj8hRop4wvpL5huzGhvv uAvJrx8yU1LrJR2bNDT2pJxmBbAoZhPZYNIY4uDczHOo4WlLdNjry3YS+9Aa0BFkaN8j 466Jo2Rrf5LGw4cZvJe1VTi8oIzG7n4I6iOoSZ3kHup936jAp+QvxtRn10gF9os3Qjir R0tA== X-Gm-Message-State: AOAM530iT45yodDPkIt8zEPzETJYhdtryPSL3g/t0gQN4/ci/b/+HW2/ 0WzjnowwI3cb/CU50CB+8fQsUw== X-Google-Smtp-Source: ABdhPJwR7z3pWYUC4wTDcM0bfq7Sktc8xgnJwNYrkaJBxgxBFwsQ1OUnnxNUFTqJB+axKz/ngiOIvg== X-Received: by 2002:a62:804a:0:b029:1e7:d747:de3 with SMTP id j71-20020a62804a0000b02901e7d7470de3mr1888106pfd.38.1614663137892; Mon, 01 Mar 2021 21:32:17 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:37ab:7b44:a136:e385]) by smtp.gmail.com with ESMTPSA id o129sm17929757pgo.27.2021.03.01.21.32.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Mar 2021 21:32:16 -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 v9 4/4] docs/pinctrl: document debugfs files Date: Mon, 1 Mar 2021 21:30:59 -0800 Message-Id: <20210302053059.1049035-5-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210302053059.1049035-1-drew@beagleboard.org> References: <20210302053059.1049035-1-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 Reviewed-by: Andy Shevchenko Reviewed-by: Tony Lindgren Signed-off-by: Drew Fustini --- Documentation/driver-api/pin-control.rst | 37 ++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/Documentation/driver-api/pin-control.rst b/Documentation/driver-api/pin-control.rst index 3d2deaf48841..c905b273e833 100644 --- a/Documentation/driver-api/pin-control.rst +++ b/Documentation/driver-api/pin-control.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``: prints each configured pin controller handle and 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 for a group:: + + echo "" > pinmux-select