From patchwork Wed Feb 17 22:14:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 384089 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 EEB0BC43381 for ; Wed, 17 Feb 2021 22:16:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BCCDF64E5F for ; Wed, 17 Feb 2021 22:16:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233398AbhBQWQk (ORCPT ); Wed, 17 Feb 2021 17:16:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233389AbhBQWQi (ORCPT ); Wed, 17 Feb 2021 17:16:38 -0500 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C774C0617A7 for ; Wed, 17 Feb 2021 14:15:19 -0800 (PST) Received: by mail-pj1-x1036.google.com with SMTP id z9so137848pjl.5 for ; Wed, 17 Feb 2021 14:15:19 -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=Y9rWQpGXIz66daXxWsY1gOWjvlN/z304wIufJTlMDGo=; b=KxHon1W8x3c1Lf5e3+SIMFIcGK+3MYlyYBNOs1EzakzAbVFcOgAV5T3A/GQBBEPNxC Won0BbFPxtwnDFkP1UoxPsTL0sK7uaqqo+bmvNsjyEireyD22g6THwD7ERhjlNs+ALb4 G77Z21EVUT2GFaXXWI3yDY2FDU9gky60rC2cMyPpc9HmsdzDaE0gEgNRlLe2+5LxrOHX bLMq8+G+B4cqtz6Wrf7ecyHKBjCrehDo26vSBYvIBGRQuUK/0cGYEE08en+/Df0HoH4y ANJS1myo0PyvHEbb4WQX7DhYRnO+Pe0FHz3HTpFV7gQVW1GbTO7QqqhL2bTFHhbuBfgp OV8g== 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=Y9rWQpGXIz66daXxWsY1gOWjvlN/z304wIufJTlMDGo=; b=BJiZrMNkNiucdsP/TixfxzMiU3ESJFs4nsaa4LUjrElcQ40SfVWLXEO+en9KoStUiw vja3B/lnphSE0I8cGaLw/CKL04gyB6ywE2oyWIovD07caCHADgtxwi2XXWJVAEAIY1F2 Sj05rs7kwuddv8XHycC21IJvdLFM/x5CfMZCrMq2y2MgdwwPZKXj5wQ3krgIPif65mCJ xyowl8aaMA975m5QEyxZhxqlwIS0HmBb8zVcrkvwDLaZoJbEXI2r5atrZ0jUW5BoaZqg E0pATbFKgqcTu/6ju7TgO74p61CMKH7ygee0v9d8AxvoR22AAIS2/Do/NQbqqGh4UX5U pqoQ== X-Gm-Message-State: AOAM532XeVswla+Qwql9euMfFGNtshtArPEfxuZNKa3nCDtLW3zuCBYE mdrfHjilRjNZSZUECulOo2BsrA== X-Google-Smtp-Source: ABdhPJx7a2TKoUOvKWFwYDqvHzZTQEJxsPaU8z/ZcnkpVNh44lma3zVa8OXhOGi1PvaG0JWX7SVdtw== X-Received: by 2002:a17:90b:618:: with SMTP id gb24mr874830pjb.163.1613600118771; Wed, 17 Feb 2021 14:15:18 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:c31f:9bea:96ec:ef07]) by smtp.gmail.com with ESMTPSA id q43sm3142591pjq.25.2021.02.17.14.15.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Feb 2021 14:15:18 -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 v7 3/3] docs/pinctrl: document debugfs files Date: Wed, 17 Feb 2021 14:14:58 -0800 Message-Id: <20210217221457.1827266-4-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210217221457.1827266-1-drew@beagleboard.org> References: <20210217221457.1827266-1-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..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