From patchwork Mon Jul 22 15:45:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 11052915 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 33BD513B1 for ; Mon, 22 Jul 2019 16:13:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 24A05285E2 for ; Mon, 22 Jul 2019 16:13:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 18AE828620; Mon, 22 Jul 2019 16:13:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 946FB285E2 for ; Mon, 22 Jul 2019 16:13:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730285AbfGVQNg (ORCPT ); Mon, 22 Jul 2019 12:13:36 -0400 Received: from vern.gendns.com ([98.142.107.122]:51336 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728972AbfGVQNf (ORCPT ); Mon, 22 Jul 2019 12:13:35 -0400 X-Greylist: delayed 1635 seconds by postgrey-1.27 at vger.kernel.org; Mon, 22 Jul 2019 12:13:34 EDT DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lechnology.com; s=default; h=Message-Id:Date:Subject:Cc:To:From:Sender: Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=1innLmemI1YK9z1CEeqUt59/OsFQDgFrRWTZveqQDFo=; b=et8rX0i0bdlwCoihML2rE8CE+n WJlLtDVFMTum0shQ6D8BN1OfsfGGA/hRMaI+G0RP5LhKxJppFjFfSHj9OA57O+cbWy71lYBShYBO0 p0lEpgEGkLFZETJw6lwqJ3Oe5UF9Z9RJHiilz4oN0ZWwBnhHUHLaOgBj+c2M0ASps2h2ymfgNsu8d /gyna72Cyg9n5ldNIAg3DIOJZ838RwxBiZQiC3sqBFTHQ+98Gfod4Axeum0HDsUGZV7Q3uWgTba/j f38J10it5JtaduHPEn2eqWoX061t+RFBZbCHkgXp2nxLj1yDC4QvFT+aEMYnVwADJtNg0B9P4CBHJ HLlDiGzA==; Received: from 108-198-5-147.lightspeed.okcbok.sbcglobal.net ([108.198.5.147]:44690 helo=freyr.lechnology.com) by vern.gendns.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1hpaW1-006p1O-CJ; Mon, 22 Jul 2019 11:46:17 -0400 From: David Lechner To: linux-iio@vger.kernel.org, linux-omap@vger.kernel.org, devicetree@vger.kernel.org Cc: David Lechner , Rob Herring , Mark Rutland , =?utf-8?q?Beno=C3=AEt_Cousson?= , Tony Lindgren , William Breathitt Gray , Thierry Reding , linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org Subject: [PATCH 0/4] new driver for TI eQEP Date: Mon, 22 Jul 2019 10:45:34 -0500 Message-Id: <20190722154538.5314-1-david@lechnology.com> X-Mailer: git-send-email 2.17.1 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This series adds device tree bindings and a new counter driver for the Texas Instruments Enhanced Quadrature Encoder Pulse (eQEP). As mentioned in one of the commit messages, to start with, the driver only supports reading the current counter value and setting the min/max values. Other features can be added on an as-needed basis. The only other feature I am interested in is adding is getting time data in order to calculate the rotational speed of a motor. However, there probably needs to be a higher level discussion of how this can fit into the counter subsystem in general first. This series has been tested on a BeagleBone Blue with the following script: #!/usr/bin/env python3 from os import path from time import sleep COUNTER_PATH = '/sys/bus/counter/devices' COUNTERS = ['counter0', 'counter1', 'counter2'] COUNT0 = 'count0' COUNT = 'count' CEILING = 'ceiling' FLOOR = 'floor' ENABLE = 'enable' cnts = [] for c in COUNTERS: enable_path = path.join(COUNTER_PATH, c, COUNT0, ENABLE) with open(enable_path, 'w') as f: f.write('1') ceiling_path = path.join(COUNTER_PATH, c, COUNT0, CEILING) with open(ceiling_path, 'w') as f: f.write(str(0xffffffff)) cnt_path = path.join(COUNTER_PATH, c, COUNT0, COUNT) cnts.append(open(cnt_path, 'r')) while True: for c in cnts: c.seek(0) val = int(c.read()) if val >= 0x80000000: val -= 0x100000000 print(val, end=' ') print() sleep(1) David Lechner (4): dt-bindings: counter: new bindings for TI eQEP counter: new TI eQEP driver ARM: dts: am33xx: Add nodes for eQEP ARM: dts: am335x-boneblue: Enable eQEP .../devicetree/bindings/counter/ti-eqep.txt | 18 + MAINTAINERS | 6 + arch/arm/boot/dts/am335x-boneblue.dts | 54 +++ arch/arm/boot/dts/am33xx-l4.dtsi | 27 ++ drivers/counter/Kconfig | 12 + drivers/counter/Makefile | 1 + drivers/counter/ti-eqep.c | 381 ++++++++++++++++++ drivers/pwm/Kconfig | 2 +- 8 files changed, 500 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/counter/ti-eqep.txt create mode 100644 drivers/counter/ti-eqep.c