Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934561AbcJ0Glx (ORCPT ); Thu, 27 Oct 2016 02:41:53 -0400 Received: from 4.mo4.mail-out.ovh.net ([178.32.98.131]:53394 "EHLO 4.mo4.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934124AbcJ0Gld (ORCPT ); Thu, 27 Oct 2016 02:41:33 -0400 From: Lukasz Majewski To: Thierry Reding , Stefan Agner , Boris Brezillon Cc: linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Fabio Estevam , Fabio Estevam , Lothar Wassmann , Bhuvanchandra DV , kernel@pengutronix.de, Lothar Wassmann , Lukasz Majewski Subject: [PATCH v2 08/10] pwm: core: make the PWM_POLARITY flag in DTB optional Date: Thu, 27 Oct 2016 08:29:44 +0200 Message-Id: <1477549785-4972-9-git-send-email-l.majewski@majess.pl> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1477549785-4972-1-git-send-email-l.majewski@majess.pl> References: <1477549785-4972-1-git-send-email-l.majewski@majess.pl> X-Ovh-Tracer-Id: 11480519877156192901 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeelvddrjedtgdduudduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddm Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2452 Lines: 84 From: Lothar Wassmann Change the pwm chip driver registration, so that a chip driver that supports polarity inversion can still be used with DTBs that don't provide the 'PWM_POLARITY' flag. This is done to provide polarity inversion support for the pwm-imx driver without having to modify all existing DTS files. Signed-off-by: Lothar Wassmann Signed-off-by: Bhuvanchandra DV Suggested-by: Sascha Hauer Signed-off-by: Lukasz Majewski --- Changes for v2: - None --- drivers/pwm/core.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index ec7179f..d80e5c5 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -137,9 +137,14 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) { struct pwm_device *pwm; + /* check, whether the driver supports a third cell for flags */ if (pc->of_pwm_n_cells < 3) return ERR_PTR(-EINVAL); + /* flags in the third cell are optional */ + if (args->args_count < 2) + return ERR_PTR(-EINVAL); + if (args->args[0] >= pc->npwm) return ERR_PTR(-EINVAL); @@ -148,11 +153,10 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) return pwm; pwm->args.period = args->args[1]; + pwm->args.polarity = PWM_POLARITY_NORMAL; - if (args->args[2] & PWM_POLARITY_INVERTED) + if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED) pwm->args.polarity = PWM_POLARITY_INVERSED; - else - pwm->args.polarity = PWM_POLARITY_NORMAL; return pwm; } @@ -163,9 +167,14 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) { struct pwm_device *pwm; + /* sanity check driver support */ if (pc->of_pwm_n_cells < 2) return ERR_PTR(-EINVAL); + /* all cells are required */ + if (args->args_count != pc->of_pwm_n_cells) + return ERR_PTR(-EINVAL); + if (args->args[0] >= pc->npwm) return ERR_PTR(-EINVAL); @@ -674,13 +683,6 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id) goto put; } - if (args.args_count != pc->of_pwm_n_cells) { - pr_debug("%s: wrong #pwm-cells for %s\n", np->full_name, - args.np->full_name); - pwm = ERR_PTR(-EINVAL); - goto put; - } - pwm = pc->of_xlate(pc, &args); if (IS_ERR(pwm)) goto put; -- 2.1.4