From patchwork Mon Feb 25 10:42:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10828423 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 C72DC17EF for ; Mon, 25 Feb 2019 10:43:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B47062AD83 for ; Mon, 25 Feb 2019 10:43:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A79222ADC0; Mon, 25 Feb 2019 10:43:46 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 417F32AD83 for ; Mon, 25 Feb 2019 10:43:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726668AbfBYKnp (ORCPT ); Mon, 25 Feb 2019 05:43:45 -0500 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:32339 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726617AbfBYKnp (ORCPT ); Mon, 25 Feb 2019 05:43:45 -0500 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 x1PAftBv025960; Mon, 25 Feb 2019 11:43:15 +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 2qtvtwsdep-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 25 Feb 2019 11:43:15 +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 BE1C73A; Mon, 25 Feb 2019 10:43:12 +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 92F242844; Mon, 25 Feb 2019 10:43:12 +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; Mon, 25 Feb 2019 11:43:11 +0100 From: Fabrice Gasnier To: , , CC: , , , , , , , , , , , Subject: [PATCH 2/2] iio: counter: stm32-lptimer: Add power management support Date: Mon, 25 Feb 2019 11:42:47 +0100 Message-ID: <1551091367-21718-3-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551091367-21718-1-git-send-email-fabrice.gasnier@st.com> References: <1551091367-21718-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG7NODE3.st.com (10.75.127.21) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-02-25_06:,, signatures=0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add suspend/resume PM sleep ops. When going to low power, disable active counter. Only active counter should be resumed: don't touch disabled counter, as it may be used by other LPTimer MFD child driver. Signed-off-by: Fabrice Gasnier --- drivers/iio/counter/stm32-lptimer-cnt.c | 55 +++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/drivers/iio/counter/stm32-lptimer-cnt.c b/drivers/iio/counter/stm32-lptimer-cnt.c index 42fb8ba..2a49cce 100644 --- a/drivers/iio/counter/stm32-lptimer-cnt.c +++ b/drivers/iio/counter/stm32-lptimer-cnt.c @@ -14,6 +14,7 @@ #include #include #include +#include #include struct stm32_lptim_cnt { @@ -23,6 +24,7 @@ struct stm32_lptim_cnt { u32 preset; u32 polarity; u32 quadrature_mode; + bool enabled; }; static int stm32_lptim_is_enabled(struct stm32_lptim_cnt *priv) @@ -50,6 +52,7 @@ static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv, if (!enable) { clk_disable(priv->clk); + priv->enabled = false; return 0; } @@ -79,6 +82,7 @@ static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv, regmap_write(priv->regmap, STM32_LPTIM_CR, 0); return ret; } + priv->enabled = true; /* Start LP timer in continuous mode */ return regmap_update_bits(priv->regmap, STM32_LPTIM_CR, @@ -361,6 +365,56 @@ static int stm32_lptim_cnt_probe(struct platform_device *pdev) return devm_iio_device_register(&pdev->dev, indio_dev); } +#ifdef CONFIG_PM_SLEEP +static int stm32_lptim_cnt_suspend(struct device *dev) +{ + struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); + int ret; + + /* Only take care of enabled counter: don't disturb other MFD child */ + if (priv->enabled) { + ret = stm32_lptim_setup(priv, 0); + if (ret) + return ret; + + ret = stm32_lptim_set_enable_state(priv, 0); + if (ret) + return ret; + + /* Force enable state for later resume */ + priv->enabled = true; + } + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_lptim_cnt_resume(struct device *dev) +{ + struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + if (priv->enabled) { + priv->enabled = false; + ret = stm32_lptim_setup(priv, 1); + if (ret) + return ret; + + ret = stm32_lptim_set_enable_state(priv, 1); + if (ret) + return ret; + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(stm32_lptim_cnt_pm_ops, stm32_lptim_cnt_suspend, + stm32_lptim_cnt_resume); + static const struct of_device_id stm32_lptim_cnt_of_match[] = { { .compatible = "st,stm32-lptimer-counter", }, {}, @@ -372,6 +426,7 @@ static struct platform_driver stm32_lptim_cnt_driver = { .driver = { .name = "stm32-lptimer-counter", .of_match_table = stm32_lptim_cnt_of_match, + .pm = &stm32_lptim_cnt_pm_ops, }, }; module_platform_driver(stm32_lptim_cnt_driver);