From patchwork Mon Apr 12 13:27:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Clemens Gruber X-Patchwork-Id: 419631 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99B01C433B4 for ; Mon, 12 Apr 2021 13:29:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4973E61288 for ; Mon, 12 Apr 2021 13:29:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241773AbhDLN3q (ORCPT ); Mon, 12 Apr 2021 09:29:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241820AbhDLN3o (ORCPT ); Mon, 12 Apr 2021 09:29:44 -0400 Received: from mail.pqgruber.com (mail.pqgruber.com [IPv6:2a05:d014:575:f70b:4f2c:8f1d:40c4:b13e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60C88C06138C; Mon, 12 Apr 2021 06:29:22 -0700 (PDT) Received: from workstation.tuxnet (213-47-165-233.cable.dynamic.surfer.at [213.47.165.233]) by mail.pqgruber.com (Postfix) with ESMTPSA id AE1F3C725CF; Mon, 12 Apr 2021 15:29:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pqgruber.com; s=mail; t=1618234161; bh=SxiB/wQTlRoG8/dxG1/RTDvR1hDyB+kFAQl39HISeJU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bHWDhbPtqiUMa6Te6Xl59XLDbFz8txMpjGNr0YkdnVWVRO/1ALoBmUmIQvltK7RQW y1NO+GCZ5gMEKHFOTvJ0Ubd04nOpb/pYpi413xKBnx+LFANvco3Qk95zQsrZGrn5fZ whWZJeWCz42nPfFlduLSWibAAZq0UlBCewbpQgms= From: Clemens Gruber To: linux-pwm@vger.kernel.org Cc: Thierry Reding , Sven Van Asbroeck , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Clemens Gruber Subject: [PATCH v8 5/8] pwm: core: Support new PWM_USAGE_POWER flag Date: Mon, 12 Apr 2021 15:27:42 +0200 Message-Id: <20210412132745.76609-5-clemens.gruber@pqgruber.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210412132745.76609-1-clemens.gruber@pqgruber.com> References: <20210412132745.76609-1-clemens.gruber@pqgruber.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org If the flag PWM_USAGE_POWER is set on a channel, the PWM driver may optimize the signal as long as the power output is not changed. Depending on the specific driver, the optimization could for example improve EMI (if supported) by phase-shifting the individual channels. Signed-off-by: Clemens Gruber --- drivers/pwm/core.c | 9 +++++++-- include/linux/pwm.h | 1 + 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index a8eff4b3ee36..56a9c739e1b2 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -153,9 +153,14 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) pwm->args.period = args->args[1]; pwm->args.polarity = PWM_POLARITY_NORMAL; + pwm->args.usage_power = false; - if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED) - pwm->args.polarity = PWM_POLARITY_INVERSED; + if (args->args_count > 2) { + if (args->args[2] & PWM_POLARITY_INVERTED) + pwm->args.polarity = PWM_POLARITY_INVERSED; + if (args->args[2] & PWM_USAGE_POWER) + pwm->args.usage_power = true; + } return pwm; } diff --git a/include/linux/pwm.h b/include/linux/pwm.h index e4d84d4db293..555e050e8bec 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -41,6 +41,7 @@ enum pwm_polarity { struct pwm_args { u64 period; enum pwm_polarity polarity; + bool usage_power; }; enum {