From patchwork Tue Feb 5 12:40:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10797437 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 6E4EC6C2 for ; Tue, 5 Feb 2019 12:41:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5DD7D2AF82 for ; Tue, 5 Feb 2019 12:41:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 51A612BA91; Tue, 5 Feb 2019 12:41:56 +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=unavailable 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 A7F072AF82 for ; Tue, 5 Feb 2019 12:41:55 +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=l9id4V3ovmMJgDqf381wpUJespoZsxxD6J8jOWkiaAI=; b=DDj1xWJSt6rLAR UQhfnUKmVYeJbUDtZ64jQNx6c3RUsoFCtJ68NpRCsoHteqxCWZ2QF+p5tL1opLYmy2V+5ZW/IQhjV mqOnTfQsx4zTtt9olKs+vaZ/lo8JI6zfprB0r/QAnKp3LnhKXV6pFGL8fT+FtahKx4/nNao18wUou c0/69gxwtGAi4r3kl1pJ3n3LAx3BDixxLK0U5Ou64ljmvSQA+b136vlJ6kMyaOdIFrjdd88cVtZZf Z6rm8IIvvNuXdNMhhVsbjCedxbaQN6oc9P2k75EOXcLXeO7aEPS/U6Mv3ydyCD5jiT+2lZlDwkH8K tR+v+mGvJWqqv089lHbw==; 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 1gr02y-00034o-8f; Tue, 05 Feb 2019 12:41:52 +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 1gr01z-00026p-D6 for linux-arm-kernel@lists.infradead.org; Tue, 05 Feb 2019 12:40:55 +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 x15CaEJQ002718; Tue, 5 Feb 2019 13:40:42 +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 2qd1v06pqn-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 05 Feb 2019 13:40:42 +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 43A8A31; Tue, 5 Feb 2019 12:40:42 +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 20A8829AC; Tue, 5 Feb 2019 12:40:42 +0000 (GMT) Received: from localhost (10.75.127.47) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 5 Feb 2019 13:40:41 +0100 From: Fabrice Gasnier To: , , Subject: [PATCH 2/4] pwm: stm32-lp: Add power management support Date: Tue, 5 Feb 2019 13:40:27 +0100 Message-ID: <1549370429-19116-3-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1549370429-19116-1-git-send-email-fabrice.gasnier@st.com> References: <1549370429-19116-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG4NODE2.st.com (10.75.127.11) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-05_05:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190205_044051_782206_0A01F18E X-CRM114-Status: GOOD ( 13.55 ) 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, linux-pwm@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, vilhelm.gray@gmail.com, mcoquelin.stm32@gmail.com, 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, disable active PWM channel. Active PWM channel is resumed, by calling pwm_apply_state(). This is inspired by Thierry's comment in [1]. Don't touch inactive channels, as it may be used by other LPTimer MFD child driver. [1]https://lkml.org/lkml/2017/12/5/175 Signed-off-by: Fabrice Gasnier --- drivers/pwm/pwm-stm32-lp.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c index 0059b24c..0c40d48 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 @@ -20,6 +21,8 @@ struct stm32_pwm_lp { struct pwm_chip chip; struct clk *clk; struct regmap *regmap; + struct pwm_state suspend; + bool suspended; }; static inline struct stm32_pwm_lp *to_stm32_pwm_lp(struct pwm_chip *chip) @@ -223,6 +226,40 @@ static int stm32_pwm_lp_remove(struct platform_device *pdev) return pwmchip_remove(&priv->chip); } +#ifdef CONFIG_PM_SLEEP +static int stm32_pwm_lp_suspend(struct device *dev) +{ + struct stm32_pwm_lp *priv = dev_get_drvdata(dev); + + pwm_get_state(&priv->chip.pwms[0], &priv->suspend); + priv->suspended = priv->suspend.enabled; + + /* safe to call pwm_disable() for already disabled pwm */ + pwm_disable(&priv->chip.pwms[0]); + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_pwm_lp_resume(struct device *dev) +{ + struct stm32_pwm_lp *priv = dev_get_drvdata(dev); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + /* Only restore suspended pwm, not to disrupt other MFD child */ + if (!priv->suspended) + return 0; + + return pwm_apply_state(&priv->chip.pwms[0], &priv->suspend); +} +#endif + +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 +272,7 @@ static int stm32_pwm_lp_remove(struct platform_device *pdev) .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);