From patchwork Tue Jan 26 13:12:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksij Rempel X-Patchwork-Id: 12046533 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,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 7588EC433DB for ; Tue, 26 Jan 2021 13:14:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 350EE23109 for ; Tue, 26 Jan 2021 13:14:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404103AbhAZNNk (ORCPT ); Tue, 26 Jan 2021 08:13:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404111AbhAZNNg (ORCPT ); Tue, 26 Jan 2021 08:13:36 -0500 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 6B3DAC061D7F for ; Tue, 26 Jan 2021 05:12:52 -0800 (PST) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l4O9C-0001l1-9b; Tue, 26 Jan 2021 14:12:42 +0100 Received: from ore by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1l4O9A-0002CG-Sx; Tue, 26 Jan 2021 14:12:40 +0100 From: Oleksij Rempel To: Rob Herring , William Breathitt Gray Cc: Oleksij Rempel , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Pengutronix Kernel Team , David Jander , Robin van der Gracht , linux-iio@vger.kernel.org Subject: [PATCH v4 0/2] add support for GPIO based counter Date: Tue, 26 Jan 2021 14:12:37 +0100 Message-Id: <20210126131239.8335-1-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-iio@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org changes v4: - use IRQ_NOAUTOEN to not enable IRQ by default - rename gpio_ from name pattern and make this driver work any IRQ source. changes v3: - convert counter to atomic_t changes v2: - add commas - avoid possible unhandled interrupts in the enable path - do not use of_ specific gpio functions Add support for GPIO based pulse counter. For now it can only count pulses. With counter char device support, we will be able to attach timestamps and measure actual pulse frequency. Never the less, it is better to mainline this driver now (before chardev patches go mainline), to provide developers additional use case for the counter framework with chardev support. Oleksij Rempel (2): dt-bindings: counter: add pulse-counter binding counter: add IRQ or GPIO based pulse counter .../bindings/counter/pulse-counter.yaml | 52 ++++ drivers/counter/Kconfig | 10 + drivers/counter/Makefile | 1 + drivers/counter/pulse-cnt.c | 235 ++++++++++++++++++ 4 files changed, 298 insertions(+) create mode 100644 Documentation/devicetree/bindings/counter/pulse-counter.yaml create mode 100644 drivers/counter/pulse-cnt.c