From patchwork Mon Sep 21 09:33:23 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 7228501 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7A515BEEC1 for ; Mon, 21 Sep 2015 09:37:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9CF302070C for ; Mon, 21 Sep 2015 09:37:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB82E20711 for ; Mon, 21 Sep 2015 09:37:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932167AbbIUJeX (ORCPT ); Mon, 21 Sep 2015 05:34:23 -0400 Received: from down.free-electrons.com ([37.187.137.238]:54247 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756406AbbIUJeQ (ORCPT ); Mon, 21 Sep 2015 05:34:16 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id DC65F211F; Mon, 21 Sep 2015 11:34:14 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from localhost.localdomain (col31-4-88-188-80-5.fbx.proxad.net [88.188.80.5]) by mail.free-electrons.com (Postfix) with ESMTPSA id 3DCDA1F8F; Mon, 21 Sep 2015 11:33:40 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org, Mark Brown , Liam Girdwood , Jingoo Han , Lee Jones , linux-fbdev@vger.kernel.org, Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, Maxime Ripard , linux-sunxi@googlegroups.com, Heiko Stuebner , linux-rockchip@lists.infradead.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Daniel Mack , Haojian Zhuang , Robert Jarzmik Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Doug Anderson , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Boris Brezillon Subject: [PATCH v3 06/12] pwm: add the PWM initial state retrieval infra Date: Mon, 21 Sep 2015 11:33:23 +0200 Message-Id: <1442828009-6241-7-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1442828009-6241-1-git-send-email-boris.brezillon@free-electrons.com> References: <1442828009-6241-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a ->reset_state() function to the pwm_ops struct to let PWM drivers initialize the PWM state attached to a PWM device. Signed-off-by: Boris Brezillon --- drivers/pwm/core.c | 3 +++ include/linux/pwm.h | 4 ++++ 2 files changed, 7 insertions(+) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 963238c3..60ad758 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -270,6 +270,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip, pwm->hwpwm = i; pwm_set_default_polarity(pwm, polarity); + if (chip->ops->reset_state) + chip->ops->reset_state(chip, pwm); + radix_tree_insert(&pwm_tree, pwm->pwm, pwm); } diff --git a/include/linux/pwm.h b/include/linux/pwm.h index f8cc460..cddb12b 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -179,6 +179,9 @@ static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) * @set_polarity: configure the polarity of this PWM * @enable: enable PWM output toggling * @disable: disable PWM output toggling + * @reset_state: reset the current PWM state (pwm->state) to the actual + * hardware state. This function is only called once per + * PWM device when the PWM chip is registered. * @dbg_show: optional routine to show contents in debugfs * @owner: helps prevent removal of modules exporting active PWMs */ @@ -191,6 +194,7 @@ struct pwm_ops { enum pwm_polarity polarity); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); + void (*reset_state)(struct pwm_chip *chip, struct pwm_device *pwm); #ifdef CONFIG_DEBUG_FS void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s); #endif