Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752770AbbKPI7M (ORCPT ); Mon, 16 Nov 2015 03:59:12 -0500 Received: from down.free-electrons.com ([37.187.137.238]:34795 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752446AbbKPI5R (ORCPT ); Mon, 16 Nov 2015 03:57:17 -0500 From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org, Mark Brown , Liam Girdwood , Kamil Debski , lm-sensors@lm-sensors.org, Jean Delvare , Guenter Roeck , Dmitry Torokhov , linux-input@vger.kernel.org, Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, Maxime Ripard , Chen-Yu Tsai , linux-sunxi@googlegroups.com, Joachim Eastwood , Thomas Petazzoni , Heiko Stuebner , linux-rockchip@lists.infradead.org, Jingoo Han , Lee Jones , linux-fbdev@vger.kernel.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Robert Jarzmik , Alexandre Belloni , Julia Lawall , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Boris Brezillon Subject: [PATCH v4 19/24] pwm: add the PWM initial state retrieval infra Date: Mon, 16 Nov 2015 09:56:42 +0100 Message-Id: <1447664207-24370-20-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1447664207-24370-1-git-send-email-boris.brezillon@free-electrons.com> References: <1447664207-24370-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2051 Lines: 54 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 Tested-by: Heiko Stuebner --- 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 6bbda6c..ce8b373 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -271,6 +271,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip, pwm_set_default_polarity(pwm, polarity); mutex_init(&pwm->lock); + 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 292e7da..caa0ffe 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -182,6 +182,9 @@ 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 */ @@ -194,6 +197,7 @@ 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 -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/