From patchwork Wed Oct 15 05:21:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 399748 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 59AF914009E for ; Wed, 15 Oct 2014 16:37:26 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751061AbaJOFhZ (ORCPT ); Wed, 15 Oct 2014 01:37:25 -0400 Received: from mail-bn1bon0134.outbound.protection.outlook.com ([157.56.111.134]:12237 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751039AbaJOFhZ (ORCPT ); Wed, 15 Oct 2014 01:37:25 -0400 X-Greylist: delayed 896 seconds by postgrey-1.27 at vger.kernel.org; Wed, 15 Oct 2014 01:37:24 EDT Received: from DM2PR03CA0024.namprd03.prod.outlook.com (10.141.96.23) by BY2PR0301MB0614.namprd03.prod.outlook.com (25.160.125.24) with Microsoft SMTP Server (TLS) id 15.0.1049.19; Wed, 15 Oct 2014 05:22:27 +0000 Received: from BY2FFO11FD047.protection.gbl (2a01:111:f400:7c0c::182) by DM2PR03CA0024.outlook.office365.com (2a01:111:e400:2428::23) with Microsoft SMTP Server (TLS) id 15.0.1054.13 via Frontend Transport; Wed, 15 Oct 2014 05:22:26 +0000 Received: from az84smr01.freescale.net (192.88.158.2) by BY2FFO11FD047.mail.protection.outlook.com (10.1.15.175) with Microsoft SMTP Server (TLS) id 15.0.1039.16 via Frontend Transport; Wed, 15 Oct 2014 05:22:26 +0000 Received: from titan.ap.freescale.net ([10.192.208.233]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id s9F5MFL5004739; Tue, 14 Oct 2014 22:22:24 -0700 From: Xiubo Li To: , CC: , Xiubo Li Subject: [PATCH v2 3/3] pwm: ftm: add Power Management support for FTM pwm. Date: Wed, 15 Oct 2014 13:21:35 +0800 Message-ID: <1413350495-40980-4-git-send-email-Li.Xiubo@freescale.com> X-Mailer: git-send-email 2.1.0.27.g96db324 In-Reply-To: <1413350495-40980-1-git-send-email-Li.Xiubo@freescale.com> References: <1413350495-40980-1-git-send-email-Li.Xiubo@freescale.com> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.158.2; CTRY:US; IPV:CAL; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10019020)(6009001)(199003)(189002)(47776003)(20776003)(84676001)(97736003)(64706001)(62966002)(80022003)(50986999)(76176999)(26826002)(87286001)(46102003)(21056001)(102836001)(68736004)(89996001)(69596002)(88136002)(87936001)(31966008)(92726001)(48376002)(86362001)(44976005)(6806004)(85306004)(19580395003)(19580405001)(85852003)(93916002)(36756003)(120916001)(50466002)(99396003)(104166001)(92566001)(105606002)(77156001)(106466001)(81156004)(76482002)(95666004)(229853001)(104016003)(4396001)(50226001)(107046002); DIR:OUT; SFP:1102; SCL:1; SRVR:BY2PR0301MB0614; H:az84smr01.freescale.net; FPR:; MLV:ovrnspm; PTR:InfoDomainNonexistent; A:1; MX:1; LANG:en; MIME-Version: 1.0 X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;SRVR:BY2PR0301MB0614; X-Forefront-PRVS: 0365C0E14B Received-SPF: Fail (protection.outlook.com: domain of freescale.com does not designate 192.88.158.2 as permitted sender) receiver=protection.outlook.com; client-ip=192.88.158.2; helo=az84smr01.freescale.net; Authentication-Results: spf=fail (sender IP is 192.88.158.2) smtp.mailfrom=Li.Xiubo@freescale.com; X-OriginatorOrg: freescale.com Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Add PM support for FTM pwm driver using callback function suspend and resume in .driver.pm of platform_driver. Signed-off-by: Xiubo Li --- drivers/pwm/pwm-fsl-ftm.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c index 9bfbea5..666e1be 100644 --- a/drivers/pwm/pwm-fsl-ftm.c +++ b/drivers/pwm/pwm-fsl-ftm.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -436,7 +437,7 @@ static int fsl_pwm_probe(struct platform_device *pdev) if (IS_ERR(base)) return PTR_ERR(base); - fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, + fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "ftm_sys", base, &fsl_pwm_regmap_config); if (IS_ERR(fpc->regmap)) { dev_err(&pdev->dev, "regmap init failed\n"); @@ -487,6 +488,51 @@ static int fsl_pwm_remove(struct platform_device *pdev) return pwmchip_remove(&fpc->chip); } +#ifdef CONFIG_PM_SLEEP +static int fsl_pwm_suspend(struct device *dev) +{ + struct fsl_pwm_chip *fpc = dev_get_drvdata(dev); + u32 val; + + regcache_cache_only(fpc->regmap, true); + regcache_mark_dirty(fpc->regmap); + + /* read from cache */ + regmap_read(fpc->regmap, FTM_OUTMASK, &val); + if ((val & 0xFF) != 0xFF) { + clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]); + clk_disable_unprepare(fpc->clk[fpc->cnt_select]); + clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]); + } + + return 0; +} + +static int fsl_pwm_resume(struct device *dev) +{ + struct fsl_pwm_chip *fpc = dev_get_drvdata(dev); + u32 val; + + /* read from cache */ + regmap_read(fpc->regmap, FTM_OUTMASK, &val); + if ((val & 0xFF) != 0xFF) { + clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]); + clk_prepare_enable(fpc->clk[fpc->cnt_select]); + clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]); + } + + /* restore all registers from cache */ + regcache_cache_only(fpc->regmap, false); + regcache_sync(fpc->regmap); + + return 0; +} +#endif + +static const struct dev_pm_ops fsl_pwm_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(fsl_pwm_suspend, fsl_pwm_resume) +}; + static const struct of_device_id fsl_pwm_dt_ids[] = { { .compatible = "fsl,vf610-ftm-pwm", }, { /* sentinel */ } @@ -497,6 +543,7 @@ static struct platform_driver fsl_pwm_driver = { .driver = { .name = "fsl-ftm-pwm", .of_match_table = fsl_pwm_dt_ids, + .pm = &fsl_pwm_pm_ops, }, .probe = fsl_pwm_probe, .remove = fsl_pwm_remove,