From patchwork Wed Feb 21 06:58:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajkumar Rampelli X-Patchwork-Id: 875981 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zmT1v2Gl9z9ry1 for ; Wed, 21 Feb 2018 18:02:11 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751518AbeBUG7c (ORCPT ); Wed, 21 Feb 2018 01:59:32 -0500 Received: from hqemgate14.nvidia.com ([216.228.121.143]:16219 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751416AbeBUG7a (ORCPT ); Wed, 21 Feb 2018 01:59:30 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com id ; Tue, 20 Feb 2018 22:59:34 -0800 Received: from HQMAIL103.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 20 Feb 2018 22:59:28 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 20 Feb 2018 22:59:28 -0800 Received: from DRUKMAIL102.nvidia.com (10.25.59.20) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 21 Feb 2018 06:59:28 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by drukmail102.nvidia.com (10.25.59.20) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 21 Feb 2018 06:59:23 +0000 Received: from rrajk-ubuntu.nvidia.com (10.124.1.5) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1347.2 via Frontend Transport; Wed, 21 Feb 2018 06:59:12 +0000 From: Rajkumar Rampelli To: , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH 01/10] pwm: core: Add support for PWM HW driver with pwm capture only Date: Wed, 21 Feb 2018 12:28:50 +0530 Message-ID: <1519196339-9377-2-git-send-email-rrajk@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1519196339-9377-1-git-send-email-rrajk@nvidia.com> References: <1519196339-9377-1-git-send-email-rrajk@nvidia.com> MIME-Version: 1.0 Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Add support for pwm HW driver which has only capture functionality. This helps to implement the PWM based Tachometer driver which reads the PWM output signals from electronic fans. PWM Tachometer captures the period and duty cycle of the PWM signal Signed-off-by: Rajkumar Rampelli --- drivers/pwm/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 1581f6a..87d14c9 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -246,6 +246,10 @@ static bool pwm_ops_check(const struct pwm_ops *ops) if (ops->apply) return true; + /* driver supports capture operation */ + if (ops->capture) + return true; + return false; }