From mboxrd@z Thu Jan 1 00:00:00 1970 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=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no 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 CA5D9C76188 for ; Mon, 22 Jul 2019 15:46:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C9D32190F for ; Mon, 22 Jul 2019 15:46:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=lechnology.com header.i=@lechnology.com header.b="et8rX0i0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729199AbfGVPqU (ORCPT ); Mon, 22 Jul 2019 11:46:20 -0400 Received: from vern.gendns.com ([98.142.107.122]:44082 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727123AbfGVPqU (ORCPT ); Mon, 22 Jul 2019 11:46:20 -0400 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=20Cousson?= , 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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- 2.17.1