From patchwork Sat Feb 20 20:27:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 385397 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 8104FC433E6 for ; Sat, 20 Feb 2021 20:29:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D44A64ECA for ; Sat, 20 Feb 2021 20:29:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229886AbhBTU32 (ORCPT ); Sat, 20 Feb 2021 15:29:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59278 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229891AbhBTU3W (ORCPT ); Sat, 20 Feb 2021 15:29:22 -0500 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB60BC0617A9 for ; Sat, 20 Feb 2021 12:28:08 -0800 (PST) Received: by mail-pl1-x630.google.com with SMTP id f8so5298596plg.5 for ; Sat, 20 Feb 2021 12:28:08 -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=U8ZmjrxOmELViwc9AyVYtXHixP3nj10dIfkqJbLS8aE=; b=eS7yPJljQGWjuJMMxqbZwkHUTVYl8v4kzt6L95XPmHT6mNdd8L7EaXY4iAkPDjM5iW z+5XNCHpWrcbNlpBbNraNhCuaQ+3hQv3jgevykJ5FMqKP2ZsKEyvKqf8np8PAa5Y/7AR 8lqnoCvV0Ks1HmYSvnWNx0/kuU2IATjVE+6MT0RQqrZ1gj65DejTZIMOczvo99q4SVcW lYLwPPIbu8w0gsDy+qggj9n0U85msawLcY3GpuIDn5pN/DAu2CO3z9X1EdswlNQnoZJ5 6ixCY9P69uieFPE7eYa+Q/zK7LWbR8rVeU76nKbfbxRjUN5A+GwDzjAVG71chHNckLnG NzOw== 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=U8ZmjrxOmELViwc9AyVYtXHixP3nj10dIfkqJbLS8aE=; b=pGnMngg1I3Tpdzal2b/Zn8ascsA0q8YJVaisfpawMaY8spmiXNxzahAlYox+JnVHSQ 5IitEwMjOBrL2IF6iy8oFP+87rSKtk4SpT613+0XXP4ENh6cVUNXXan8mON1j45ZHoih 1CVF2XPtEzZg5iDtod5u4BE6Km0Rzifhp+Lu3SX2wW726XXKUdeeFdjHFm43ppSjTKO/ CstGbT7q6BLieWURdVR15sPNEn1GiQDBaGY20cM2zSAa5CYQh26tj5dt11JfQ9FQOS+V VXw+PJ3t+jWdiH8ivlYJIez70welDUiw/ew2C+0CLpXSGKef9FDfiRG1smYL8CA+fPrj kS7Q== X-Gm-Message-State: AOAM532orSRX4dMjI1+Rf6RhNQZ9lDcGPMqJOv7ndwPpcplFm8EkhRBz JHgJLXY3rbw9jSTUodlEvTNeaQ== X-Google-Smtp-Source: ABdhPJy1BoNkNQb5ifXpVxXSpZP6sFp3o18og3WLYV/ouirrPldF6GXEIN4rJXT9vHeDDLl9Ny5ZiQ== X-Received: by 2002:a17:90a:6405:: with SMTP id g5mr15104193pjj.137.1613852888379; Sat, 20 Feb 2021 12:28:08 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:3902:ca9d:7b75:1d0c]) by smtp.gmail.com with ESMTPSA id 125sm13497871pfu.7.2021.02.20.12.28.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Feb 2021 12:28:07 -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 v8 3/3] docs/pinctrl: document debugfs files Date: Sat, 20 Feb 2021 12:27:50 -0800 Message-Id: <20210220202750.117421-4-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210220202750.117421-1-drew@beagleboard.org> References: <20210220202750.117421-1-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/pinctl.rst | 37 +++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/Documentation/driver-api/pinctl.rst b/Documentation/driver-api/pinctl.rst index 3d2deaf48841..c905b273e833 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``: 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