From patchwork Wed Mar 30 20:03:28 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 8706341 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 8ED479F44D for ; Thu, 31 Mar 2016 00:49:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8C5D720383 for ; Thu, 31 Mar 2016 00:49:07 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 90BA620374 for ; Thu, 31 Mar 2016 00:49:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 271496E928; Thu, 31 Mar 2016 00:48:50 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.free-electrons.com (down.free-electrons.com [37.187.137.238]) by gabe.freedesktop.org (Postfix) with ESMTP id 8CAB06E8A9; Wed, 30 Mar 2016 20:04:38 +0000 (UTC) Received: by mail.free-electrons.com (Postfix, from userid 110) id 52D971829; Wed, 30 Mar 2016 22:04:37 +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=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost.localdomain (LFbn-1-2159-240.w90-76.abo.wanadoo.fr [90.76.216.240]) by mail.free-electrons.com (Postfix) with ESMTPSA id AE15E181B; Wed, 30 Mar 2016 22:04:24 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Subject: [PATCH v5 05/46] pwm: introduce the pwm_args concept Date: Wed, 30 Mar 2016 22:03:28 +0200 Message-Id: <1459368249-13241-6-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> References: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> X-Mailman-Approved-At: Thu, 31 Mar 2016 00:47:56 +0000 Cc: Milo Kim , Kamil Debski , linux-doc@vger.kernel.org, Mike Turquette , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, Alexandre Belloni , Daniel Vetter , Lee Jones , linux-clk@vger.kernel.org, linux-leds@vger.kernel.org, Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, Alexander Shiyan , Jonathan Corbet , Robert Jarzmik , lm-sensors@lm-sensors.org, linux-rockchip@lists.infradead.org, Chen-Yu Tsai , Tomi Valkeinen , linux-input@vger.kernel.org, Jean-Christophe Plagniol-Villard , intel-gfx@lists.freedesktop.org, Guenter Roeck , Jean Delvare , Joachim Eastwood , Bryan Wu , Mark Brown , Jacek Anaszewski , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , Ryan Mallon , Jingoo Han , Dmitry Torokhov , Stephen Boyd , Liam Girdwood , Hartley Sweeten , Richard Purdie , Kukjin Kim , Maxime Ripard X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Currently the PWM core mixes the current PWM state with the per-platform reference config (specified through the PWM lookup table, DT definition or directly hardcoded in PWM drivers). Create a pwm_args struct to store this reference config, so that PWM users can differentiate the current config from the reference one. Patch all places where pwm->args should be initialized. We keep the pwm_set_polarity/period() calls until all PWM users are patched to use pwm_args instead of pwm_get_period/polarity(). Signed-off-by: Boris Brezillon --- drivers/pwm/core.c | 13 +++++++++---- drivers/pwm/pwm-clps711x.c | 3 ++- drivers/pwm/pwm-pxa.c | 1 + include/linux/pwm.h | 26 ++++++++++++++++++++++++++ 4 files changed, 38 insertions(+), 5 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 7c330ff..cd55d61 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -146,12 +146,14 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) if (IS_ERR(pwm)) return pwm; - pwm_set_period(pwm, args->args[1]); + pwm->args.period = args->args[1]; + pwm_set_period(pwm, pwm->args.period); if (args->args[2] & PWM_POLARITY_INVERTED) - pwm_set_polarity(pwm, PWM_POLARITY_INVERSED); + pwm->args.polarity = PWM_POLARITY_INVERSED; else - pwm_set_polarity(pwm, PWM_POLARITY_NORMAL); + pwm->args.polarity = PWM_POLARITY_NORMAL; + pwm_set_polarity(pwm, pwm->args.polarity); return pwm; } @@ -172,7 +174,8 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) if (IS_ERR(pwm)) return pwm; - pwm_set_period(pwm, args->args[1]); + pwm->args.period = args->args[1]; + pwm_set_period(pwm, pwm->args.period); return pwm; } @@ -740,6 +743,8 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id) if (IS_ERR(pwm)) goto out; + pwm->args.period = chosen->period; + pwm->args.polarity = chosen->polarity; pwm_set_period(pwm, chosen->period); pwm_set_polarity(pwm, chosen->polarity); diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c index a80c108..807a48d 100644 --- a/drivers/pwm/pwm-clps711x.c +++ b/drivers/pwm/pwm-clps711x.c @@ -60,7 +60,8 @@ static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) return -EINVAL; /* Store constant period value */ - pwm_set_period(pwm, DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq)); + pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq); + pwm_set_period(pwm, pwm->args.period); return 0; } diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c index cb2f702..3fcc886 100644 --- a/drivers/pwm/pwm-pxa.c +++ b/drivers/pwm/pwm-pxa.c @@ -160,6 +160,7 @@ pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) if (IS_ERR(pwm)) return pwm; + pwm->args.period = args->args[0]; pwm_set_period(pwm, args->args[0]); return pwm; diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 6555f01..ed65354 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -74,6 +74,23 @@ enum pwm_polarity { PWM_POLARITY_INVERSED, }; +/** + * struct pwm_args - PWM arguments + * @period: reference period + * @polarity: reference polarity + * + * This structure describe board-dependent arguments attached to a PWM + * device. Those arguments are usually retrieved from the PWM lookup table or + * DT definition. + * This should not be confused with the PWM state: PWM args not representing + * the current PWM state, but the configuration the PWM user plan to use + * on this PWM device. + */ +struct pwm_args { + unsigned int period; + enum pwm_polarity polarity; +}; + enum { PWMF_REQUESTED = 1 << 0, PWMF_ENABLED = 1 << 1, @@ -91,6 +108,7 @@ enum { * @period: period of the PWM signal (in nanoseconds) * @duty_cycle: duty cycle of the PWM signal (in nanoseconds) * @polarity: polarity of the PWM signal + * @args: PWM arguments */ struct pwm_device { const char *label; @@ -103,6 +121,8 @@ struct pwm_device { unsigned int period; unsigned int duty_cycle; enum pwm_polarity polarity; + + struct pwm_args args; }; static inline bool pwm_is_enabled(const struct pwm_device *pwm) @@ -142,6 +162,12 @@ static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) return pwm ? pwm->polarity : PWM_POLARITY_NORMAL; } +static inline void pwm_get_args(const struct pwm_device *pwm, + struct pwm_args *args) +{ + *args = pwm->args; +} + /** * struct pwm_ops - PWM controller operations * @request: optional hook for requesting a PWM