From patchwork Wed Jul 1 08:21:51 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 6701061 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 018D8C05AC for ; Wed, 1 Jul 2015 08:22:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D6B602067A for ; Wed, 1 Jul 2015 08:22:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8632E20678 for ; Wed, 1 Jul 2015 08:22:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753051AbbGAIWr (ORCPT ); Wed, 1 Jul 2015 04:22:47 -0400 Received: from down.free-electrons.com ([37.187.137.238]:34307 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753173AbbGAIWT (ORCPT ); Wed, 1 Jul 2015 04:22:19 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 1EF6F1F4E; Wed, 1 Jul 2015 10:22:18 +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=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost.localdomain (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id AC4521F4F; Wed, 1 Jul 2015 10:22:16 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mark Brown , Liam Girdwood , Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , linux-fbdev@vger.kernel.org, Stephen Warren , Alexandre Courbot , linux-tegra@vger.kernel.org, Maxime Ripard , Jingoo Han , Lee Jones , Doug Anderson , Boris Brezillon Subject: [RFC PATCH 05/15] pwm: introduce default period and polarity concepts Date: Wed, 1 Jul 2015 10:21:51 +0200 Message-Id: <1435738921-25027-6-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> References: <1435738921-25027-1-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 When requested by a user, the PWM is assigned a default period and polarity extracted from the DT, the platform data or statically set by the driver. Those default values are currently stored in the period and polarity fields of the pwm_device struct, but they will be stored somewhere else once we have introduced the architecture allowing for hardware state retrieval. The pwm_set_default_polarity and pwm_set_default_period should only be used by PWM drivers or the PWM core infrastructure to specify the default period and polarity values. PWM users might call the pwm_get_default_period to query the default period value. There is currently no helper to query the default polarity, but it might be added later on if there is a need for it. This patch also modifies all the places where the default helpers should be used in place of the standard ones. Signed-off-by: Boris Brezillon --- drivers/leds/leds-pwm.c | 2 +- drivers/pwm/core.c | 14 +++++++------- drivers/pwm/pwm-pxa.c | 2 +- drivers/pwm/pwm-sun4i.c | 3 ++- drivers/regulator/pwm-regulator.c | 2 +- drivers/video/backlight/lm3630a_bl.c | 4 ++-- drivers/video/backlight/pwm_bl.c | 2 +- drivers/video/fbdev/ssd1307fb.c | 2 +- include/linux/pwm.h | 15 +++++++++++++++ 9 files changed, 31 insertions(+), 15 deletions(-) diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 1d07e3e..2c564d1 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -125,7 +125,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, if (led_data->can_sleep) INIT_WORK(&led_data->work, led_pwm_work); - led_data->period = pwm_get_period(led_data->pwm); + led_data->period = pwm_get_default_period(led_data->pwm); if (!led_data->period && (led->pwm_period_ns > 0)) led_data->period = led->pwm_period_ns; diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index f7c11d2..7ffad2b 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -146,12 +146,12 @@ 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_set_default_period(pwm, args->args[1]); if (args->args[2] & PWM_POLARITY_INVERTED) - pwm_set_polarity(pwm, PWM_POLARITY_INVERSED); + pwm_set_default_polarity(pwm, PWM_POLARITY_INVERSED); else - pwm_set_polarity(pwm, PWM_POLARITY_NORMAL); + pwm_set_default_polarity(pwm, PWM_POLARITY_NORMAL); return pwm; } @@ -172,7 +172,7 @@ 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_set_default_period(pwm, args->args[1]); return pwm; } @@ -262,7 +262,7 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip, pwm->chip = chip; pwm->pwm = chip->base + i; pwm->hwpwm = i; - pwm->polarity = polarity; + pwm_set_default_polarity(pwm, polarity); radix_tree_insert(&pwm_tree, pwm->pwm, pwm); } @@ -704,8 +704,8 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id) if (IS_ERR(pwm)) goto out; - pwm_set_period(pwm, chosen->period); - pwm_set_polarity(pwm, chosen->polarity); + pwm_set_default_period(pwm, chosen->period); + pwm_set_default_polarity(pwm, chosen->polarity); out: mutex_unlock(&pwm_lookup_lock); diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c index cb2f702..65b80aa 100644 --- a/drivers/pwm/pwm-pxa.c +++ b/drivers/pwm/pwm-pxa.c @@ -160,7 +160,7 @@ pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) if (IS_ERR(pwm)) return pwm; - pwm_set_period(pwm, args->args[0]); + pwm_set_default_period(pwm, args->args[0]); return pwm; } diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index cd9dde5..a364fb7 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -333,7 +333,8 @@ static int sun4i_pwm_probe(struct platform_device *pdev) val = sun4i_pwm_readl(pwm, PWM_CTRL_REG); for (i = 0; i < pwm->chip.npwm; i++) if (!(val & BIT_CH(PWM_ACT_STATE, i))) - pwm->chip.pwms[i].polarity = PWM_POLARITY_INVERSED; + pwm_set_default_polarity(&pwm->chip.pwms[i], + PWM_POLARITY_INVERSED); clk_disable_unprepare(pwm->clk); return 0; diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index ffa9612..12b4d9d 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -46,7 +46,7 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev, int dutycycle; int ret; - pwm_reg_period = pwm_get_period(drvdata->pwm); + pwm_reg_period = pwm_get_default_period(drvdata->pwm); dutycycle = (pwm_reg_period * drvdata->duty_cycle_table[selector].dutycycle) / 100; diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c index 35fe482..449ebc3 100644 --- a/drivers/video/backlight/lm3630a_bl.c +++ b/drivers/video/backlight/lm3630a_bl.c @@ -162,7 +162,7 @@ static int lm3630a_intr_config(struct lm3630a_chip *pchip) static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max) { - unsigned int period = pwm_get_period(pchip->pwmd); + unsigned int period = pwm_get_default_period(pchip->pwmd); unsigned int duty = br * period / br_max; pwm_config(pchip->pwmd, duty, period); @@ -425,7 +425,7 @@ static int lm3630a_probe(struct i2c_client *client, return PTR_ERR(pchip->pwmd); } } - pchip->pwmd->period = pdata->pwm_period; + pwm_set_default_period(pchip->pwmd, pdata->pwm_period); /* interrupt enable : irq 0 is not allowed */ pchip->irq = client->irq; diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index eff379b..ae498c1 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -294,7 +294,7 @@ static int pwm_backlight_probe(struct platform_device *pdev) * set the period from platform data if it has not already been set * via the PWM lookup table. */ - pb->period = pwm_get_period(pb->pwm); + pb->period = pwm_get_default_period(pb->pwm); if (!pb->period && (data->pwm_period_ns > 0)) { pb->period = data->pwm_period_ns; pwm_set_period(pb->pwm, data->pwm_period_ns); diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index 3e153c0..6949626 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -294,7 +294,7 @@ static int ssd1307fb_init(struct ssd1307fb_par *par) return PTR_ERR(par->pwm); } - par->pwm_period = pwm_get_period(par->pwm); + par->pwm_period = pwm_get_default_period(par->pwm); /* Enable the PWM */ pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period); pwm_enable(par->pwm); diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 6f286df..72a21d5 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -103,11 +103,21 @@ static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) pwm->period = period; } +static inline void pwm_set_default_period(struct pwm_device *pwm, unsigned int period) +{ + pwm_set_period(pwm, period); +} + static inline unsigned int pwm_get_period(const struct pwm_device *pwm) { return pwm ? pwm->period : 0; } +static inline unsigned int pwm_get_default_period(const struct pwm_device *pwm) +{ + return pwm_get_period(pwm); +} + static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty) { if (pwm) @@ -124,6 +134,11 @@ static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm) */ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity); +static inline void pwm_set_default_polarity(struct pwm_device *pwm, enum pwm_polarity polarity) +{ + pwm_set_polarity(pwm, polarity); +} + static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) { return pwm ? pwm->polarity : PWM_POLARITY_NORMAL;