From patchwork Mon May 3 21:05:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 430664 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, 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 BA1EEC433B4 for ; Mon, 3 May 2021 21:06:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9932C611EE for ; Mon, 3 May 2021 21:06:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229590AbhECVHE (ORCPT ); Mon, 3 May 2021 17:07:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229497AbhECVHE (ORCPT ); Mon, 3 May 2021 17:07:04 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6B20C061573 for ; Mon, 3 May 2021 14:06:10 -0700 (PDT) Received: from ptx.hi.pengutronix.de ([2001:67c:670:100:1d::c0]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ldflV-0005uv-9g; Mon, 03 May 2021 23:06:05 +0200 Received: from ukl by ptx.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1ldflU-000417-Hh; Mon, 03 May 2021 23:06:04 +0200 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Linus Walleij , Bartosz Golaszewski , Rob Herring Cc: linux-gpio@vger.kernel.org, kernel@pengutronix.de, devicetree@vger.kernel.org Subject: [PATCH 1/2] dt-bindings: gpio: introduce hog properties with less ambiguity Date: Mon, 3 May 2021 23:05:26 +0200 Message-Id: <20210503210526.43455-1-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: devicetree@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org For active low lines the semantic of output-low and output-high is hard to grasp because there is a double negation involved and so output-low is actually a request to drive the line high (aka inactive). So introduce output-inactive and output-active with the same semantic as output-low and output-high respectively have today, but with a more sensible name. Signed-off-by: Uwe Kleine-König Acked-by: Linus Walleij Acked-by: Rob Herring --- Hello, I already sent this patch back in July and Linus (Walleij) liked the patch but asked for an implementation. For that I added the second patch now. Best regards Uwe Documentation/devicetree/bindings/gpio/gpio.txt | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt index a8895d339bfe..1061c346a619 100644 --- a/Documentation/devicetree/bindings/gpio/gpio.txt +++ b/Documentation/devicetree/bindings/gpio/gpio.txt @@ -196,11 +196,16 @@ Only one of the following properties scanned in the order shown below. This means that when multiple properties are present they will be searched in the order presented below and the first match is taken as the intended configuration. -- input: A property specifying to set the GPIO direction as input. -- output-low A property specifying to set the GPIO direction as output with - the value low. -- output-high A property specifying to set the GPIO direction as output with - the value high. +- input: A property specifying to set the GPIO direction as input. +- output-deasserted: A property specifying to set the GPIO direction as output + with the inactive value (depending on the line's polarity, + which is active-high by default) +- output-asserted: A property specifying to set the GPIO direction as output + with the active value. + +For backwards compatibility "output-low" and "output-high" should be supported +as aliases for "output-deasserted" and "output-asserted" respectively. Their +usage is misleading for active-low outputs, so their use is discouraged. Optional properties: - line-name: The GPIO label name. If not present the node name is used.