From patchwork Wed Feb 20 13:07:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10822133 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6DF4A6C2 for ; Wed, 20 Feb 2019 13:09:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 50CD32CF17 for ; Wed, 20 Feb 2019 13:09:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 423092D588; Wed, 20 Feb 2019 13:09:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DEA9A2CF17 for ; Wed, 20 Feb 2019 13:09:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vXBQ/SFNrYFcxo+mJVIaAGYZCbGfTqnNzHeeWYYZD2o=; b=BfDKm80w+nYywZ rmq4Rc34tHY8WzZ9cC/1g8Gc8aax31CZ6WgOpnk+QG9zVEkcoIv9L2jtfthqU+84OYeycoIiu4KSW Nbeybl9QNnWbrH3VNsxX5jfb9AhS0lVKthCsP0gxqL+6UgJMWgiXFE34h/9bg4JQlf8b7r/eJHM16 zm/mssV3jwBjKsdZtwOatwv+Yuc9hVXrwb5HKdnjISg6IpL+DmRZSbbkPE32EVF5yWhws/3ngdjJE ltcjo1Gc7MkZcPzMK4y8NtVwKvE81TnOfxfi4SYlka66oj/m59T4EFnldE5P/ewniyXkFxJsbKCdV S3ewFadAtQSQlISXCZRA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gwRcy-0006Kn-NC; Wed, 20 Feb 2019 13:09:32 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gwRcl-00068R-LW for linux-arm-kernel@lists.infradead.org; Wed, 20 Feb 2019 13:09:23 +0000 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1KD6P7V019598; Wed, 20 Feb 2019 14:09:10 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2qpc6kwn65-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 20 Feb 2019 14:09:10 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 42DC431; Wed, 20 Feb 2019 13:09:09 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 27AD32BB4; Wed, 20 Feb 2019 13:09:09 +0000 (GMT) Received: from localhost (10.75.127.44) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 20 Feb 2019 14:09:08 +0100 From: Fabrice Gasnier To: Subject: [PATCH v5 2/3] pwm: stm32-lp: Add power management support Date: Wed, 20 Feb 2019 14:07:47 +0100 Message-ID: <1550668068-9661-3-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1550668068-9661-1-git-send-email-fabrice.gasnier@st.com> References: <1550668068-9661-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG3NODE1.st.com (10.75.127.7) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-20_11:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190220_050920_010991_8C586454 X-CRM114-Status: GOOD ( 12.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, alexandre.torgue@st.com, tduszyns@gmail.com, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, robh+dt@kernel.org, mcoquelin.stm32@gmail.com, u.kleine-koenig@pengutronix.de, fabrice.gasnier@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add suspend/resume PM sleep ops. When going to low power, enforce the PWM channel isn't active. Let the PWM consumers disable it during their own suspend sequence. Only perform a check here, and handle the pinctrl states. See [1]. [1] https://lkml.org/lkml/2019/2/5/770 Signed-off-by: Fabrice Gasnier --- Changes in v2: - Don't disable PWM channel: let the PWM user disable it. Refuse to suspend in case it's been left enabled. - Drop the ifdefs, use __maybe_unused instead. --- drivers/pwm/pwm-stm32-lp.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c index 0059b24c..2211a64 100644 --- a/drivers/pwm/pwm-stm32-lp.c +++ b/drivers/pwm/pwm-stm32-lp.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -223,6 +224,29 @@ static int stm32_pwm_lp_remove(struct platform_device *pdev) return pwmchip_remove(&priv->chip); } +static int __maybe_unused stm32_pwm_lp_suspend(struct device *dev) +{ + struct stm32_pwm_lp *priv = dev_get_drvdata(dev); + struct pwm_state state; + + pwm_get_state(&priv->chip.pwms[0], &state); + if (state.enabled) { + dev_err(dev, "The consumer didn't stop us (%s)\n", + priv->chip.pwms[0].label); + return -EBUSY; + } + + return pinctrl_pm_select_sleep_state(dev); +} + +static int __maybe_unused stm32_pwm_lp_resume(struct device *dev) +{ + return pinctrl_pm_select_default_state(dev); +} + +static SIMPLE_DEV_PM_OPS(stm32_pwm_lp_pm_ops, stm32_pwm_lp_suspend, + stm32_pwm_lp_resume); + static const struct of_device_id stm32_pwm_lp_of_match[] = { { .compatible = "st,stm32-pwm-lp", }, {}, @@ -235,6 +259,7 @@ static struct platform_driver stm32_pwm_lp_driver = { .driver = { .name = "stm32-pwm-lp", .of_match_table = of_match_ptr(stm32_pwm_lp_of_match), + .pm = &stm32_pwm_lp_pm_ops, }, }; module_platform_driver(stm32_pwm_lp_driver);